CN102980842B - System and method for testing anisotropy permeability coefficient of layered coarse-grained soil body - Google Patents

Abstract

The invention discloses a test system and test method for the anisotropic permeability coefficient of layered coarse-grained soil, including an upstream water supply device, a permeation device, a downstream water measuring device and a data acquisition system; the upstream water supply device injects stored test water into the The osmotic device, the permeated water passing through the osmotic device will be collected to the downstream water measuring device, and the osmotic device and the downstream water measuring device will input the collected seepage information into the data acquisition system through the set information acquisition device for information processing. The sample is prepared directly in the sample chamber of the system, the sample is saturated, and the water head at the water-passing section and the water volume passing through the sample are measured in real time, thereby avoiding disturbance to the sample. The shape of the sample is cuboid, the cross-section of the sample perpendicular to the permeation direction is square, the cross-section of the sample parallel to the permeation direction is rectangular, and the side length along the permeation direction is twice as long as the side length perpendicular to the permeation direction. It is used to test the anisotropic permeability coefficient of layered coarse-grained soil.

Description

Test system and test method for anisotropic permeability coefficient of layered coarse-grained soil

technical field

The invention belongs to the technical field of geotechnical tests, in particular to a test system and a test method for measuring the anisotropic permeability coefficient of layered coarse-grained soil.

Background technique

The soil permeability coefficient is a quantitative index reflecting the water permeability of the soil, and an extremely important index for evaluating the water permeability, anti-seepage deformation ability, and anti-penetration damage ability of the soil in engineering. In soil engineering, the common construction method is to compact the soil material layer by layer and then form a geotechnical structure with obvious layered characteristics. Due to the layered characteristics of the geotechnical structure caused by the construction method, its permeability characteristics also show significant anisotropy, that is, the permeability coefficient parallel to the layer is obviously different from the permeability coefficient perpendicular to the layer. It is of great practical significance to study the determination of anisotropic permeability coefficient of layered soil.

There are mainly two methods for testing soil permeability coefficient: in-situ test and indoor test. The indoor test is divided into constant head test and variable head test, and the permeability coefficient is calculated based on Darcy's law. The constant head test is suitable for testing the permeability coefficient of soil with strong permeability. The constant head test in my country's current geotechnical test regulations can only test the permeability coefficient of homogeneous soil samples or layered soil samples perpendicular to the layer, but cannot test the permeability coefficient parallel to the layer.

At present, there are many kinds of instruments for measuring soil permeability coefficient indoors. According to the constraints around the sample, they are divided into hard-wall permeameters and soft-wall permeameters; according to the applied water head, they are divided into constant water head test and variable water head test. . Commonly used hard-wall permeameters mainly include 70-type permeameter and Nan 55-type permeameter. The 70-type permeameter is suitable for measuring the permeability coefficient of sandy soil, and the Nan 55-type permeameter is suitable for measuring the permeability coefficient of cohesive soil. The flexible-wall permeameter is mostly improved from a triaxial tester, and the soil sample is placed in a rubber mold to apply lateral confining pressure to conduct a permeability test. Existing permeameters generally have defects such as small sample size, low osmotic pressure provided, long test period, poor sealing and water-stop effect, inability to measure the permeability coefficient parallel to the layer, and complicated instrument operation. Many scholars have improved conventional permeameters or developed new instruments for specific problems, but it is still impossible to test the permeability coefficient parallel to the layer; or even if the permeability coefficient parallel to the layer can be tested, there are still complex operations and testing The time is long, the sample is not easy to be saturated, and the permeability coefficient in two directions cannot be tested in the same instrument.

For the problem that conventional permeameters and existing improved instruments cannot accurately measure the anisotropic permeability coefficient of layered coarse-grained soil, it is necessary to develop a permeability test system to test the anisotropic permeability coefficient of layered coarse-grained soil method.

Contents of the invention

In view of this, the technical problem to be solved by the present invention is how to test the anisotropic permeability coefficient of layered coarse-grained soil.

One of the objectives of the present invention is to provide a test system for anisotropic permeability coefficient of layered coarse-grained soil; the second objective of the present invention is to provide a method for testing the anisotropic permeability coefficient of layered coarse-grained soil.

One of purpose of the present invention is achieved through the following technical solutions:

The layered coarse-grained soil anisotropic permeability coefficient testing system provided by the present invention includes an upstream water supply device, an infiltration device, a downstream water measuring device and a data acquisition system; the upstream water supply device injects stored test water into the infiltration device, The permeated water passing through the osmosis device will be collected to the downstream water measuring device, and the osmotic device and the downstream water measuring device will input the collected seepage information into the data acquisition system through the provided information acquisition device for information processing.

Further, the upstream water supply device includes a water vapor exchanger for storing test water and a high-pressure gas source for providing high-pressure gas that is insoluble in water to the water vapor exchanger; into the water vapor exchanger, and the water vapor exchanger presses the test water into the permeation device through the pressure water inlet pipe.

Further, the permeation device includes a water inlet chamber, a sample chamber and a water outlet chamber; a water-permeable plate is arranged between the water inlet chamber and the sample chamber; a water-permeable plate is arranged between the sample chamber and the water outlet chamber; the The water inlet chamber is equipped with a water pressure sensor for measuring the water head of the water inlet chamber; the water outlet chamber is equipped with a water pressure sensor for measuring the water head of the water outlet chamber; The pore water pressure sensor of the section water head; the water inlet chamber is connected with the upstream water supply device through the pressure water inlet pipe; the water outlet chamber is connected with the downstream water measuring device through the water outlet pipe.

Further, the shape of the sample chamber is cuboid, and its size is a×a×b, and b is 2-4 times of a; the side of an a×b rectangle and an a×a square of the sample chamber The side is the side that can be opened; the size of the water inlet chamber and the water outlet chamber is a×a×c, wherein, c is the thickness of the water inlet chamber and the water outlet chamber, and c is 0.1-0.5 times of a.

Further, the downstream water measuring device includes a water storage container and a load cell, a flow sensor and a timing sensor arranged on the water storage container; the water storage container is used to accommodate the permeated water passing through the sample, in order to prevent the liquid level The amount of water lost by evaporation, the container is a semi-sealed structure; the load cell is used to measure the quality change of the water in the water storage container; the flow sensor is used to measure the flow of water entering the water storage container; the timing sensor , which is used to record the duration of the water volume change process of the water storage container; the data acquisition system is used to automatically collect, store and analyze the test data collected from the osmotic device and the downstream water measuring device.

Two of the purpose of the present invention is achieved through the following technical solutions:

The anisotropic permeability coefficient of layered coarse-grained soil body provided by the invention is carried out the anisotropic permeability coefficient testing method, comprises the following steps:

S1: Prepare the test soil and divide the soil into at least 2 parts;

S2: Select and open the corresponding side of the sample chamber of the layered coarse-grained soil anisotropic permeability coefficient test system according to the requirement that the layer of the prepared sample is parallel or perpendicular to the water-passing section;

S3: Put one of the test soil materials into the sample chamber of the layered coarse-grained soil anisotropic permeability coefficient test system, and compact it to the required compactness;

S4: Repeat step S3 until the sample chamber of the layered coarse-grained soil anisotropic permeability coefficient testing system is completely filled with samples;

S5: the side of the sample room of the layered coarse-grained soil anisotropic permeability coefficient test system opened in the sealing step S2;

S6: saturated sample;

S7: Conduct permeability coefficient test directly on the saturated sample;

S8: end the test.

Further, the shape of the sample is cuboid, its size is a×a×b, the cross section of the sample perpendicular to the permeation direction is a square, and its side length is a, and a is 5-5 of the sample particle size d ₈₅ . 10 times; b is the length of the sample, and b is 2-4 times of a.

Further, the sample preparation is prepared by layered compaction method, and the prepared sample is directly used to test its permeability coefficient; the specific steps of the sample preparation are as follows:

The preparation of the sample includes the preparation of the penetration sample parallel to the layer and the preparation of the penetration sample perpendicular to the layer; the preparation of the sample is parallel to the preparation of the permeability coefficient sample of the layer. The layer of the prepared sample is parallel to the long side of the sample and perpendicular to the cross-sectional surface of the sample, so that the layer is consistent with the penetration direction in the test;

The preparation of the permeation sample perpendicular to the layer; the test soil material is laid in layers in the infiltration device and compacted layer by layer to prepare the sample. The layer of the prepared sample is perpendicular to the long side of the sample and horizontal to the sample. The truncated planes are parallel, so that the layer is perpendicular to the penetration direction in the test; the distance between the layers of the sample and the type of soil material are determined according to the purpose of the test.

Further, the permeability coefficient test specifically includes the following steps:

S51: Determine the two cross-sections in the sample, and measure the distance between the two cross-sections and the area of the cross-sections;

S52: Test the water head at the water-passing section, the water head at the water-passing section is accurately measured in real time by a pore water pressure sensor or a pore water pressure piezometer installed at the water-passing section;

S53: Test the water volume passing through the water section, the water volume passing through the water section is directly measured by a flow sensor installed at the water outlet of the sample or indirectly measured by a load cell;

S54: Test duration measurement, the test duration is determined by a timer or a timing sensor.

Further, the permeability coefficient test includes a permeability coefficient test parallel to the layer and a permeability coefficient test perpendicular to the layer;

The permeability coefficient test parallel to the layer is used for the permeability coefficient test of the permeability sample parallel to the layer;

The permeability coefficient test perpendicular to the layer is used for the permeability coefficient test of the permeability sample perpendicular to the layer.

The present invention has the advantages that: the test system for measuring layered coarse-grained soil anisotropic permeability coefficient provided by the present invention adopts upstream water supply device, infiltration device, downstream water measuring device and data acquisition system; In the sample chamber of the device, prepare the sample, saturate the sample, and measure the water head at the water-passing section and the water volume passing through the sample in real time, so as to calculate the permeability coefficient according to Darcy's law. The invention adopts the layered compaction method to prepare the sample, and directly uses the prepared sample to test the permeability coefficient, thus avoiding disturbance to the sample. Use a rectangular parallelepiped sample, the cross section of the sample perpendicular to the permeation direction is a square, the cross section parallel to the permeation direction is a rectangle, and the side length along the permeation direction is twice as long as the side length perpendicular to the permeation direction, this sample is suitable for Testing the anisotropic permeability coefficient of layered coarse-grained soils.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is the structural representation of permeability coefficient testing system of the present invention;

Fig. 2 is a schematic structural view of the upstream water supply device of the present invention;

Fig. 3 is a schematic structural view of the permeation device of the present invention;

Fig. 4 is a structural schematic diagram of the downstream water measuring device of the present invention.

Fig. 5 is a sample shape and size schematic diagram of the present invention;

Fig. 6 is the schematic diagram of the sample prepared for testing the permeability coefficient parallel to the layer of the present invention;

Fig. 7 is the schematic diagram of the sample prepared for testing the permeability coefficient perpendicular to the layer of the present invention;

Fig. 8 is a schematic diagram of the permeability coefficient testing method of the present invention.

In the figure: 11-upstream water supply device; 12-permeation device; 13-downstream water measuring device; 14-data acquisition system; 21-water vapor exchanger; 22-high pressure gas source; 23-pressure gas inlet pipe; 24-pressure water Inlet pipe; 31-inlet chamber; 32-sample chamber; 33-outlet chamber; 34-permeable plate; 35-outlet pipe; 36-pore water pressure sensor; 37, 38-water pressure sensor; 41-water storage container ; 42-load sensor; 43-flow sensor; 44-timing sensor; 51-upstream water head; 52-downstream water head; 53-seepage direction; 54-layer parallel to the seepage direction; 81-water head at the upstream cross-section; 82-water head at the downstream cross-section; 83-distance between two cross-sections; 84-upstream cross-section; 85-downstream cross-section.

Detailed ways

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

Fig. 1 is a schematic structural view of a permeability coefficient testing system of the present invention, Fig. 2 is a schematic structural view of an upstream water supply device of the present invention, Fig. 3 is a schematic structural view of an infiltration device of the present invention, and Fig. 4 is a structural schematic view of a downstream water measuring device of the present invention, as As shown in the figure: the layered coarse-grained soil anisotropic permeability coefficient test system provided by the present invention includes an upstream water supply device 11, a permeation device 12, a downstream water measuring device 13 and a data acquisition system 14;

The purpose of the upstream water supply device is to provide the sample with water required for sample saturation and permeability coefficient test, and has a certain water head. This device is connected with the water inlet chamber of the osmotic device. The upstream water supply device injects the stored test water into the osmosis device, and the permeated water passing through the osmosis device will be collected to the downstream water measuring device, and the permeation device and the downstream water measuring device will collect the water seepage information collected by the information collection device provided. Input to the data acquisition system for information processing.

The upstream water supply device includes a water vapor exchanger 21 for storing water used in the test and a high-pressure gas source 22 for providing water vapor exchanger with a high-pressure gas that is hardly soluble in water; the high-pressure gas source passes through a pressure gas inlet pipe 23 The high pressure gas is pressed into the water vapor exchanger; the water vapor exchanger presses water into the permeation device through the pressure water inlet pipe 24 .

The water vapor exchanger can store enough water for the test, and can make the water have a high head under the condition of high-pressure air source, and provide it to the water inlet chamber of the permeation device through the water inlet pipe. The high-pressure gas source is used to provide high-pressure gas that is insoluble in water, such as nitrogen, to the water vapor exchanger.

The penetration device is the core of the penetration test system. Its purpose is to prepare the sample, saturate the sample, measure the water head at the water-passing section and the water volume passing through the sample in real time, so as to calculate the permeability coefficient according to Darcy's law. The permeation device includes a water inlet chamber 31, a sample chamber 32 and a water outlet chamber 33; a water permeable plate 34 is arranged between the water inlet chamber and the sample chamber; a water permeable plate is arranged between the sample chamber and the water outlet chamber The water inlet chamber is equipped with a water pressure sensor 37 for measuring the head of the water inlet chamber; the water outlet chamber is equipped with a water pressure sensor 38 for measuring the water head of the water outlet chamber; to measure the water head of the water inlet chamber and the water outlet chamber respectively.

The sample chamber is equidistantly installed with pore water pressure sensors 36 for measuring the water head of the fixed cross section; in this embodiment, four pore water pressure sensors are installed at equal intervals in the sample chamber so as to simultaneously measure the pressure of four fixed cross sections. water head. The water inlet chamber is connected with the upstream water supply device through the pressure water inlet pipe 24 , and the water outlet chamber is connected with the downstream water measuring device through the water outlet pipe 35 .

The shape of the sample chamber is cuboid, and its size is a×a×b (a is the side length perpendicular to the permeation direction, b is the side length parallel to the permeation direction), and b should not be less than twice a , that is, b≥2a, in this embodiment, b is 2-4 times of a, and can also be changed according to actual requirements; an axb rectangular side and an axa square side of the sample chamber can be opened Side; the dimensions of the water inlet chamber and the water outlet chamber are a×a×c (c is the thickness of the water inlet chamber and the water outlet chamber, and c is about 0.1-0.5 times of a).

The purpose of the downstream measuring device is to measure the amount of water passing through the sample and the elapsed time. This device is connected to the outlet chamber of the permeation device. The downstream water measuring device includes a water storage container 41 and a load cell 42, a flow sensor 43 and a timing sensor 44 arranged on the water storage container;

The water storage container is used to accommodate the water that penetrates through the sample, and in order to prevent the loss of water by evaporation on the liquid surface, the container is a semi-sealed structure.

The load cell is used to measure the mass change of the water in the water storage container, so as to indirectly obtain the volume of the water and calculate the flow rate.

The flow sensor is used to measure the flow of water entering the water storage container, and the flow sensor is used to directly measure the flow. Load cells and flow sensors complement each other to ensure correct flow measurements.

The timing sensor is used to record the duration of the water volume change process of the water storage container.

The data collection system is used for automatically collecting, storing and analyzing the test data collected from the permeation device and the downstream water measuring device. The system is used to automatically collect, store and analyze test data, and is connected with the sensors in the permeation device and the downstream water measuring device. It consists of three parts: data collection box, computer and data collection and analysis software.

Also included are test accessories including a sample preparation compactor and a balance.

Fig. 5 is a schematic diagram of the shape and size of the sample of the present invention, Fig. 6 is a schematic diagram of the sample prepared for testing the permeability coefficient parallel to the layer of the present invention, and Fig. 7 is a schematic diagram of the sample prepared for testing the permeability coefficient perpendicular to the layer of the present invention Sample schematic diagram, Figure 8 is a schematic diagram of the permeability coefficient test method of the present invention, in the figure, upstream water head 51; downstream water head 52; seepage direction 53; layer 54 parallel to the seepage direction; layer 55 perpendicular to the seepage direction; The water head 81 at place; The water head 82 at downstream crossing section place; The distance 83 between two crossing sections; Upstream crossing section 84; Anisotropic permeability coefficient test method, comprising the following steps:

S1: Prepare the test soil, and divide the test soil into at least 2 parts, or distribute the test soil according to actual requirements;

S2: Determine the sample size. The shape of the sample is cuboid, its size is a×a×b, the cross-section of the sample perpendicular to the permeation direction is a square, and its side length is a, and a is not less than 5 times the particle size d ₈₅ of the sample. In the example, a is 5-10 times of the particle size d ₈₅ of the sample; b is the length of the sample, and b is 2-4 times of a.

S3: Select and open the corresponding side of the sample chamber of the layered coarse-grained soil anisotropic permeability coefficient test system according to the requirement that the layer of the prepared sample is parallel or perpendicular to the water-passing section;

S4: Put one of the test soil materials into the sample room of the layered coarse-grained soil anisotropic permeability coefficient test system, and compact it to the required compactness;

S4: Repeat step S3 until the sample chamber of the layered coarse-grained soil anisotropic permeability coefficient testing system is completely filled with samples;

S5: sealing the side of the sample chamber of the layered coarse-grained soil anisotropic permeability coefficient testing system opened in step S2.

The sample is prepared by a layered compaction method, and the prepared sample is directly used to test its permeability coefficient. The specific steps of the sample preparation are as follows:

The preparation of the sample includes the preparation of the penetration sample parallel to the layer and the preparation of the penetration sample perpendicular to the layer; the preparation of the sample is parallel to the preparation of the permeability coefficient sample of the layer. The layer of the prepared sample is parallel to the long side of the sample and perpendicular to the cross-sectional surface of the sample, so that the layer is consistent with the penetration direction in the test;

The preparation of the permeation sample perpendicular to the layer; the test soil material is laid in layers in the infiltration device and compacted layer by layer to prepare the sample. The layer of the prepared sample is perpendicular to the long side of the sample and cross-cuts the sample The surface is parallel so that the layer is perpendicular to the direction of penetration in the test.

The distance between the sample layers and the type of soil material are determined according to the purpose of the test. The distance between layers in the sample can be the same or different; the soil materials in each layer in the sample can be the same or different.

The permeation device is a rectangular parallelepiped sample chamber, and the sample chamber is provided with two sides perpendicular to each other that can be opened separately. According to the requirement that the layer of the prepared sample is parallel or perpendicular to the cross-section of the water, the test chamber is opened. The corresponding side of the sample chamber, and then prepare a sample meeting the test requirements in the sample chamber.

S6: saturated sample;

S7: directly test the permeability coefficient of the saturated sample; according to the groundwater seepage theory, test the permeability coefficient of the soil, and the permeability coefficient test specifically includes the following steps:

S71: Determine the two cross-sections in the sample, and measure the distance between the two cross-sections and the area of the cross-sections;

S72: Test the water head at the water-passing section, the water head at the water-passing section is measured in real time by a pore water pressure sensor and/or a pore water pressure piezometer installed at the water-passing section;

S73: Test the water volume passing through the water section, the water volume passing through the water section is directly measured by the flow sensor installed at the water outlet of the sample and/or indirectly measured by the load cell;

S74: Test duration measurement, the test duration is determined by a timer and/or a timing sensor.

The permeability coefficient test includes a permeability coefficient test parallel to the layer and a permeability coefficient test perpendicular to the layer;

The permeability coefficient test parallel to the layer is used for the permeability coefficient test of the permeability sample parallel to the layer;

The permeability coefficient test perpendicular to the layer is used for the permeability coefficient test of the permeability sample perpendicular to the layer.

S8: end the test.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (8)

1. stratiform coarse grain soil body anisotropy permeability coefficient test macro, is characterized in that: comprise upstream water supply installation, permeability apparatus, downstream water gaging device and data acquisition system (DAS); The test water of storage is injected into permeability apparatus by described upstream water supply installation, and the infiltration water through permeability apparatus is collected downstream water gaging device, the infiltration information of collection is input to data acquisition system (DAS) by the information collecting device arranged and carries out information processing by described permeability apparatus and downstream water gaging device;

Described permeability apparatus comprises intake chamber, sample chamber and water-supplying chamber; Porous disc is provided with between described intake chamber and sample chamber; Porous disc is provided with between described sample chamber and water-supplying chamber; Described intake chamber is provided with the water pressure sensor for measuring intake chamber head; Described water-supplying chamber is provided with the water pressure sensor for measuring hydroecium head; Described sample chamber is equidistantly provided with multiple pore water pressure sensor for measuring fixing water-carrying section head; Described intake chamber is connected with upstream water supply installation by press water water inlet pipe; Described water-supplying chamber is connected with downstream water gaging device by rising pipe;

The shape of described sample chamber is cuboid, and it is of a size of a × a × b, and b is 2-4 times of a; A × b oblong lateral surface and a × a square sides of described sample chamber are the side that can open; Described intake chamber and water-supplying chamber are of a size of a × a × c, and wherein, c is the thickness of intake chamber and water-supplying chamber, and c is 0.1-0.5 times of a.

2. stratiform coarse grain soil body anisotropy permeability coefficient test macro according to claim 1, is characterized in that: described upstream water supply installation comprises the high pressurized gas providing the gases at high pressure being insoluble in water for the water-vapor exchange device of storage test water and water supply vapour interchanger; Gases at high pressure pass in water-vapor exchange device by pressed gas draft tube by described high pressurized gas, and test water is pressed in permeability apparatus by press water water inlet pipe by described water-vapor exchange device.

3. stratiform coarse grain soil body anisotropy permeability coefficient test macro according to claim 1, is characterized in that: described downstream water gaging device comprises tank and is arranged at LOAD CELLS, flow sensor and the timing sensor on tank; Described tank, for holding the infiltration water by sample, in order to prevent liquid surface evaporation from losing the water yield, this tank is Semi-seal structure; Described LOAD CELLS, for measuring the mass change of water in tank; Described flow sensor, for measuring the flow entering water in tank; Described timing sensor, for recording lasting of tank water yield change procedure; Described data acquisition system (DAS), for automatically gathering, storing and analyze the test figure collecting permeability apparatus and downstream water gaging device.

4. utilize stratiform coarse grain soil body anisotropy permeability coefficient test macro according to any one of claim 1-3 to carry out the method for testing of anisotropy permeability coefficient, it is characterized in that: comprise the following steps:

S1: prepare test earth material, and earth material is divided at least 2 parts;

S2: select the respective side opening aforementioned stratiform coarse-grained soil body anisotropy permeability coefficient test macro sample chamber according to the requirement that the aspect preparing sample is parallel or vertical with water-carrying section;

S3: sample chamber a copy of it test earth material being loaded stratiform coarse grain soil body anisotropy permeability coefficient test macro, and be compacted to the packing of requirement;

S4: repeat step S3, until stratiform coarse grain soil body anisotropy permeability coefficient test macro sample chamber is full of sample completely;

S5: the side of the stratiform coarse grain soil body anisotropy permeability coefficient test macro sample chamber opened in airtight step S2;

S6: saturated sample;

S7: directly carry out infiltration coefficient test to through oversaturated sample;

S8: terminate test.

5. the stratiform coarse grain soil body anisotropy permeability coefficient test macro that utilizes according to claim 4 is to carry out the method for testing of anisotropy permeability coefficient, it is characterized in that: the shape of described sample is cuboid, it is of a size of a × a × b, sample section perpendicular to infiltration direction is square, its length of side is a, and a is sample particle diameter d ₈₅5-10 times; B is specimen length, and b is 2-4 times of a.

6. the stratiform coarse grain soil body anisotropy permeability coefficient test macro that utilizes according to claim 4 is to carry out the method for testing of anisotropy permeability coefficient, it is characterized in that: the method that employing compaction in layers prepared by described sample is prepared, the sample after preparation is directly used in its infiltration coefficient of test; It is as follows that concrete steps prepared by described sample:

Described sample preparation comprises and is parallel to the preparation of aspect infiltration sample and the preparation perpendicular to aspect infiltration sample; Described sample preparation is parallel to the preparation of aspect infiltration coefficient sample, adopt layering void paving test earth material in permeability apparatus and successively compacting sample preparation, the described aspect preparing sample is parallel with the long limit of sample, vertical with sample cross section transverse, makes to permeate direction in aspect and test consistent;

The described preparation perpendicular to aspect infiltration sample; Adopt layering void paving test earth material successively compacting sample preparation in permeability apparatus, the described aspect preparing sample is vertical with the long limit of sample, parallel with sample cross section transverse, makes aspect and permeate direction in testing vertical; Described sample basal spacing, earth material type are determined according to test objective.

7. the stratiform coarse grain soil body anisotropy permeability coefficient test macro that utilizes according to claim 4 is to carry out the method for testing of anisotropy permeability coefficient, it is characterized in that: described infiltration coefficient test specifically comprises the following steps:

S51: determine two water-carrying section in sample, and measure the area of the Distance geometry water-carrying section between two water-carrying section;

S52: the head at test water-carrying section place, the head at described water-carrying section place is by being arranged on pore water pressure sensor or the pore water pressure piezometric tube the real time measure at water-carrying section place;

S53: test the water yield by water-carrying section, the described water yield by water-carrying section adopts the flow sensor being arranged on sample water delivering orifice directly to measure or LOAD CELLS indirect determination;

S54: test lasts measurement, described test is lasted and is measured by timer or timing sensor.

8. the stratiform coarse grain soil body anisotropy permeability coefficient test macro that utilizes according to claim 4 is to carry out the method for testing of anisotropy permeability coefficient, it is characterized in that: the test of described infiltration coefficient comprises the infiltration coefficient test that is parallel to aspect and the infiltration coefficient perpendicular to aspect is tested;

The described infiltration coefficient test being parallel to aspect, for testing the infiltration coefficient being parallel to aspect infiltration sample;

The described infiltration coefficient perpendicular to aspect is tested, for testing the infiltration coefficient perpendicular to aspect infiltration sample.