CN104596869A - Test method of four-dimensional dynamic quantitative analysis during soil shear failure - Google Patents
Test method of four-dimensional dynamic quantitative analysis during soil shear failure Download PDFInfo
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Abstract
The invention discloses a test method of four-dimensional dynamic quantitative analysis during soil shear failure. The method comprises the steps of firstly, based on a two-dimensional optical testing technology, acquiring two-dimensional plane dynamic change characteristics based on time dimension in the soil shear process; setting time at intervals, carrying out a micro-computed tomography (CT) test on a soil sample by an X-ray detector based on a rotary table type scanning technology to obtain soil three-dimensional space static characteristics; establishing a light hole transmission registration model, and carrying out spatial aligning on two-dimensional optical data and three-dimensional micro-CT data; according to the dynamic change of same mark points of the two-dimensional optical data and three-dimensional micro-CT data, carrying out butt joint on the two-dimensional plane change data and the micro-CT three-dimensional space data by a space registration relation to obtain the soil three-dimensional space dynamic change characteristics based on time dimension; therefore, the test method of the four-dimensional dynamic quantitative analysis during soil shear failure can be realized.
Description
Technical field
The present invention relates to the test method of the four-dimensional dynamic analysis of a kind of soil body shear failure, belong to civil engineering work indoor test technical field.
Background technology
The shear failure mechanism of the soil body is the focus of Chinese scholars research always, China develops and has introduced the test method of many soil body microtextures, as: mercury intrusion method, magnetic susceptibility method, scanning electron microscope analysis method (SEM), computed tomography analytic approach (CT), Microstructure Optics test macro (MOTS) etc., development and the shear failure mechanism introduced as the further investigation soil body of these test methods provide approach.But the equal Shortcomings of existing all kinds of soil body microtexture test method, cannot realize the analysis of experiments of four-dimensional dynamic quantitative, provide four-dimensional dynamic analysis test method and will make announcement damage of soil body study mechanism undoubtedly further.
Although forefathers have carried out fruitful research in optic test, CT test, achieve many achievements, the factor restrictions such as tested person instrument, measuring technology, two kinds of methods still all have deficiency:
(1) in optic test, microtexture optic testing system (MOTS) has greater advantage in rock-soil material microtexture Continuous Tracking, quantitative observation.But, optical observation can only provide the information of light institute cover part, therefore the method provides two dimensional surface observation data (soil sample is semicolumn sample), fails to obtain soil body three-dimensional microstructure information, and soil structures three dimensions describes and obviously has more advantage.
(2) in CT test, traditional CT test machine (over-borrowing medical ct machine) obtain soil body material microtexture three-dimensional information in progressively substitute by high-performance Micro-CT machine.However, current Micro-CT machine only scans (before as on-test, after off-test) the soil body under a certain special state, this means of testing still can not the real change situation of follow-on test rock-soil material microstructure under load (other research techniques are also like this, as SEM method etc.), therefore also cannot consider the actual displacement change information of rock-soil material microparticle and hole from the time.In fact, deformation failure under rock-soil material load-bearing is the process that a primary structure destroys gradually, secondary structure is formed gradually, it is the process of a dynamic change, according to sample one-phase or destroy the microstructure change of result and carry out its Changing Pattern under stress of inference, its limitation must be had, also can only rest in qualitative and logic analysis.
Summary of the invention
Technical matters to be solved by this invention is to provide the test method of the four-dimensional dynamic analysis of a kind of soil body shear failure, the method, based on two-dimension optical measuring technology and Micro-CT three-dimensional test technology, is the test method that one can be used for four-dimensional (space three-dimensional, time dimension) dynamic analysis in soil body shear failure process.
The present invention is for solving the problems of the technologies described above by the following technical solutions
The invention provides the test method of the four-dimensional dynamic analysis of a kind of soil body shear failure, comprise following concrete steps:
Step 1, loads in shear history at the soil body, based on two-dimension optical measuring technology, obtains the two dimensional surface dynamic change characterization based on time dimension of the soil body;
Step 2, loads in shear history at the soil body, suspends and loads, based on turntable type scanning technique, adopt X-ray detector to carry out Micro-CT test to the soil body, obtain the three dimensions static nature of the soil body according to the time interval of setting;
Step 3, after Micro-CT test terminates, continues to load immediately, and continues synchronously to carry out the two dimensional surface dynamic change characterization based on time dimension that two-dimension optical test obtains the soil body;
Step 4, according to step 1 to 3, the two-dimension optical that hockets test is tested, until soil body shear failure with Micro-CT;
Step 5, set up unthreaded hole transmission registration model, the two dimensional surface dynamic change characterization based on time dimension obtained and three dimensions static nature are carried out spatial registration, according to the dynamic change of same tag point between the two, two dimensional surface dynamic change characterization based on time dimension is docked with three dimensions static nature by spatial registration relation, make to merge based on the two dimensional surface dynamic change characterization of time dimension and three dimensions static nature, obtain the soil body three dimensions dynamic change characterization based on time dimension, thus the four-dimensional dynamic analysis test realized in soil body shear failure process.
As further prioritization scheme of the present invention, based on two-dimension optical measuring technology in step 1, obtain the two dimensional surface dynamic change characterization based on time dimension in soil body shear history, be specially: the long distance microscope CCD optical camera adopting high-amplification-factor, be equipped with high-resolution digital image collection system, photo in the synchronous soil body of shooting continuously shear history, thus obtain the two dimensional surface dynamic change characterization based on time dimension.
As further prioritization scheme of the present invention, the enlargement factor of the long distance microscope CCD optical camera of above-mentioned high-amplification-factor is 20 ~ 500 times.
As further prioritization scheme of the present invention, in step 2, X-ray detector is the flat panel detector of C7942CA-02 based on CMOS of Japanese shore pine Hamamatsu.
As further prioritization scheme of the present invention, the desk-top scanning technique of step 2 transfer is specially: use an automatically controlled universal stage to complete spinfunction, utilizes x dimension, y dimension, z to tie up electronic control translation stage and realize by the adjustment of the three-dimensional space position of the scanning soil body.
The present invention adopts above technical scheme compared with prior art, there is following technique effect: the present invention is based on two-dimension optical measuring technology and Micro-CT three-dimensional test technology, the two-dimensional optical data based on time dimension (time dimension, space two-dimensional) obtained is carried out spatial registration with Micro-CT three-dimensional data (space three-dimensional), docks, fusion, obtain the soil body three dimensions dynamic change characterization based on time dimension, realize the dynamic analysis test of four-dimensional (space three-dimensional, time dimension) in soil body shear failure process.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention.
Fig. 2 is the vertical view of four-dimensional dynamic checkout unit of the present invention.
Wherein: 1-Micro-CT radiographic source; 2-semicolumn soil sample; 3-central authorities rotate parametric controller; 4-x D controller; 5-y D controller; 6-X ray; 7-Y ray flat panel detector; 8-CCD camera; 9-protects stereotype; 10-CCD plane.
Fig. 3 is the coordinate system of two-dimension optical test and the co-ordinates system schematic diagram of Micro-CT three-dimensional test.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
Fig. 1 is method flow diagram of the present invention, specifically sets forth, repeat no more here in the summary of the invention above.
Below in conjunction with specific embodiment, technical scheme of the present invention is further elaborated:
First, as shown in Figure 2, build proving installation, and prepare semi-cylindrical soil sample.
Secondly, in loading shear history, based on two-dimension optical measuring technology, obtain the two dimensional surface dynamic change characterization based on time dimension in soil body shear history.
Again, the soil body loads in shear history, according to the time of setting, as time t
1, suspend and load, start Micro-CT immediately, based on turntable type scanning technique, adopt X-ray detector to carry out the test of Micro-CT rotation sweep to soil sample;
Again, at Micro-CT soil sample carried out to after rotation sweep terminates, (note time loss is t
c1) continue immediately to load, synchronously carry out optical observation in loading procedure, be loaded into the time t of setting
2after, stop loading, proceed Micro-CT test subsequently, so repeatedly until off-test;
Again, build unthreaded hole transmission registration model, set up the co-ordinates system of two-dimension optical test coordinate system and Micro-CT three-dimensional test, spatial registration is carried out by based on the two dimensional surface dynamic change characterization of time dimension and the three dimensions static nature of acquisition, namely in data processing, according to the dynamic change of two-dimensional optical image and Micro-CT three-dimensional data same tag point, flash ranging change is corresponded to Micro-CT three-dimensional data by spatial registration relation, thus realize optical data (space two-dimensional, time dimension) merge with Micro-CT data (space three-dimensional), realize four-dimensional dynamic analysis test in soil body shear failure process.
Unthreaded hole transmission registration model and the spatial registration process of structure are as follows:
(1) coordinate system of two-dimension optical test and the co-ordinates system of Micro-CT three-dimensional test, as shown in Figure 3.Wherein, the coordinate that two-dimension optical is tested is the coordinate of M-xyz, Micro-CT three-dimensional test is O-xyz, both shared y-axis;
(2) unthreaded hole transmission registration model is built, to optical CCD camera modeling, as shown in Figure 3.In this model, CCD lens equivalent is that photocentre M, CCD place plane is called picture plane EFGH, and hand over y-axis N point as plane EFGH center, during focus, soil sample place plane is called focal plane ABCD;
(3) for the registration point P on soil sample surface, its locus can be determined by Micro-CT data, and namely the Micro-CT coordinate figure of its locus is known, is expressed as (x
cT, y
cT, z
cT), the visible ray transmitted from this point is mapped to the P ' point of CCD through optical center of lens, some P and some P ' one_to_one corresponding;
(4) because optics/Micro-CT emerging system is arranged on the optical table of same standard, three translational movements and three rotation amounts of relation between two coordinate systems (M-xyz, O-xyz) are described, two translational movements and three rotation amounts can be omitted, only consider the translational movement about y-axis;
(5) coordinate figure of Micro-CT true origin O under optical coordinate is (c
x, c
y, c
z), then registration point P at the three-dimensional coordinate of optical coordinate system is
(6) P and some P ' is put about photocentre M point symmetry, note
for l
1,
for l
2, then the coordinate of P ' is:
(7) coordinate for optical coordinate system M-xyz, registration point P is (x
m, y
m, z
m), for some registration point, instrument error function:
Wherein, i=1...n is registration point number.
(8) use optimization or searching method, ask (the c making error function Φ minimum
x, c
y, c
z).
Finally, tested by Micro-CT, the three-dimensional coordinate that can obtain inside soil body point is: (x
cT, y
cT, z
cT), the three-dimensional coordinate being obtained optical coordinate system by registration is:
Add the time factor of optic test, then soil body shearing four-dimensional test displacement field is expressed as:
The above; be only the embodiment in the present invention; but protection scope of the present invention is not limited thereto; any people being familiar with this technology is in the technical scope disclosed by the present invention; the conversion or replacement expected can be understood; all should be encompassed in and of the present inventionly comprise within scope, therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (5)
1. the test method of the four-dimensional dynamic analysis of soil body shear failure, is characterized in that, comprise following concrete steps:
Step 1, loads in shear history at the soil body, based on two-dimension optical measuring technology, obtains the two dimensional surface dynamic change characterization based on time dimension of the soil body;
Step 2, loads in shear history at the soil body, suspends and loads, based on turntable type scanning technique, adopt X-ray detector to carry out Micro-CT test to the soil body, obtain the three dimensions static nature of the soil body according to the time interval of setting;
Step 3, after Micro-CT test terminates, continues to load immediately, and continues synchronously to carry out the two dimensional surface dynamic change characterization based on time dimension that two-dimension optical test obtains the soil body;
Step 4, according to step 1 to 3, the two-dimension optical that hockets test is tested, until soil body shear failure with Micro-CT;
Step 5, set up unthreaded hole transmission registration model, the two dimensional surface dynamic change characterization based on time dimension obtained and three dimensions static nature are carried out spatial registration, according to the dynamic change of same tag point between the two, two dimensional surface dynamic change characterization based on time dimension is docked with three dimensions static nature by spatial registration relation, make to merge based on the two dimensional surface dynamic change characterization of time dimension and three dimensions static nature, obtain the soil body three dimensions dynamic change characterization based on time dimension, thus the four-dimensional dynamic analysis test realized in soil body shear failure process.
2. the test method of the four-dimensional dynamic analysis of soil body shear failure according to claim 1, it is characterized in that, based on two-dimension optical measuring technology in step 1, obtain the two dimensional surface dynamic change characterization based on time dimension in soil body shear history, be specially: the long distance microscope CCD optical camera adopting high-amplification-factor, be equipped with high-resolution digital image collection system, photo in the synchronous soil body of shooting continuously shear history, thus obtain the two dimensional surface dynamic change characterization based on time dimension.
3. the test method of the four-dimensional dynamic analysis of soil body shear failure according to claim 2, is characterized in that, the enlargement factor of the long distance microscope CCD optical camera of high-amplification-factor is 20 ~ 500 times.
4. the test method of the four-dimensional dynamic analysis of soil body shear failure according to claim 1, is characterized in that, in step 2, X-ray detector is the flat panel detector of C7942CA-02 based on CMOS of Japanese shore pine Hamamatsu.
5. the test method of the four-dimensional dynamic analysis of soil body shear failure according to claim 1, it is characterized in that, the desk-top scanning technique of step 2 transfer is specially: use an automatically controlled universal stage to complete spinfunction, utilizes x dimension, y dimension, z to tie up electronic control translation stage and realize by the adjustment of the three-dimensional space position of the scanning soil body.
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Application publication date: 20150506 Assignee: JIANGXI BOHUI ENGINEERING TECHNOLOGY SERVICE Co.,Ltd. Assignor: HOHAI University Contract record no.: X2021320000009 Denomination of invention: Experimental method for four dimensional dynamic quantitative analysis of soil shear failure Granted publication date: 20170222 License type: Common License Record date: 20210108 |
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