CN213390201U - Earth-rock dam soft foundation treatment structure with reinforced vibro-replacement gravel pile and rockfill - Google Patents
Earth-rock dam soft foundation treatment structure with reinforced vibro-replacement gravel pile and rockfill Download PDFInfo
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- CN213390201U CN213390201U CN202021356571.6U CN202021356571U CN213390201U CN 213390201 U CN213390201 U CN 213390201U CN 202021356571 U CN202021356571 U CN 202021356571U CN 213390201 U CN213390201 U CN 213390201U
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Abstract
The utility model provides a soft foundation treatment structure of an earth and rockfill dam with a reinforced vibroflotation gravel pile and a reinforced rockfill body, wherein a vibroflotation gravel pile group is arranged on a soft covering layer to reinforce the deep and soft foundation of the dam foundation; the bottom of the gravel pile is positioned on a compact layer of a covering layer or weathered bedrock; the earth and rockfill dam seepage-proofing system consists of a covering layer foundation seepage-proofing wall and a dam body seepage-proofing body; arranging a foundation reverse filter bed layer on the top of the gravel pile on the downstream side of the impervious wall; and filling a dam shell rock-fill body reinforcement area on the upper part of the gravel pile on the upstream side of the impervious wall and the upper part of the reverse filter bed layer of the downstream side foundation so as to improve the deformation modulus of the dam material on the lower part of the dam shell and the sedimentation deformation of the dam body caused by homogenizing the weak foundation and avoid the cracking of the dam body caused by uneven sedimentation. The utility model discloses to deep weak foundation condition, through reasonable weak foundation reinforcement and dam body structure strengthen the treatment and the method that combine together, realize that foundation strength, bearing capacity and deformation control satisfy the requirement of building the dam, it is significant to the earth and rockfill dam engineering technique of building the dam under the complex condition.
Description
Technical Field
The utility model belongs to the technical field of water conservancy, hydroelectric engineering technique and specifically relates to a shake and dash stone pillar and rockfill reinforced earth and rockfill dam soft foundation and handle structure.
Background
The earth and rock dam is built on a deep and soft foundation, which is a frequently encountered engineering technical problem in earth and rock dam engineering, the strength and the bearing capacity of the soft foundation often cannot meet the requirements of stability and deformation under the condition of additional load of an upper dam body, the dam cannot be directly built, and measures of foundation reinforcement and dam body structure reinforcement must be taken to ensure the stability and the safety of the dam. For weak foundations, there are many treatment methods in the project, such as direct excavation, pre-pressing consolidation drainage, consolidation grouting, dynamic compaction, vibroflotation consolidation, etc., and different methods have respective applicability and limitation according to the characteristics of the weak foundations. The vibroflotation gravel pile can accelerate foundation consolidation and further improve the soil strength among piles while compacting, replacing and reinforcing a soft foundation to form a composite foundation. Because of its mechanized construction, high efficiency and little influence by environment, it is widely used in the field of soft foundation treatment. In the soft foundation treatment of the earth and rockfill dam engineering, fewer instances of reinforcing the engineering by adopting vibro-replacement gravel piles are adopted, and the main reason is that the earth and rockfill dam foundation not only needs to meet the requirements on strength and bearing capacity, but also needs the deformation control of the whole dam foundation-dam body to meet the requirements under the action of the dam body and reservoir water, so that the cracking of the dam body and an impervious body caused by uneven deformation is avoided, and the safety of a dam is prevented.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a soft foundation consolidates the structure that combines together with the structure enhancement of dam body to the difficult problem that the dam was built to earth and rockfill dam under the deep weak foundation condition, realizes that foundation strength, bearing capacity and dam foundation-the holistic deformation control of dam body satisfy and build the dam requirement. The above object of the present invention is achieved by the following technical solutions:
the utility model provides a shake soft basic processing structure of rock-fill dam of dashing rubble stake and rockfill body reinforcement, is applied to and builds the earth-rock dam on weak overburden, its characterized in that:
arranging a vibroflotation gravel pile group on the soft covering layer, and reinforcing the deep soft foundation of the dam foundation; the bottom of the gravel pile is positioned on a compact layer of a covering layer or weathered bedrock;
the earth and rockfill dam seepage-proofing system consists of a covering layer foundation seepage-proofing wall and a dam body seepage-proofing body; arranging a foundation reverse filter bed layer on the top of the gravel pile on the downstream side of the impervious wall;
and filling a dam shell rock-fill body reinforcement area on the upper part of the gravel pile on the upstream side of the impervious wall and the upper part of the reverse filter bed layer of the downstream side foundation so as to improve the deformation modulus of the dam material on the lower part of the dam shell and the sedimentation deformation of the dam body caused by homogenizing the weak foundation and avoid the cracking of the dam body caused by uneven sedimentation.
Furthermore, the dam shell rockfill body reinforcement area is reinforced by stainless steel bars or flat steel bars in a bidirectional grid mode, and the reinforcement layering height is consistent with the rockfill filling layering height.
Furthermore, the impervious body of the dam body is a soil core wall or an inclined wall, a geomembrane core wall or an inclined wall and an asphalt concrete core wall.
The utility model discloses a set up in weak overburden basis and shake towards gravel pile and consolidate with the mode that adopts the displacement of extrusion locellus, improve weak overburden intensity and bearing capacity to satisfy the dam construction requirement of earth and rockfill dam to the basis. In addition, considering the additional load action on the upper part of the soft foundation to be homogenized under the action of the dead load of the dam body and reservoir water, accelerating the consolidation effect of the soft foundation, controlling the uneven settlement deformation of the foundation, avoiding the cracking of the dam body and the impervious body caused by the uneven settlement deformation of the foundation, further crisis the safety of the dam, and arranging a reinforcement area on the lower part of the rockfill body of the dam shell of the dam body to improve the deformation resistance of the dam body. The utility model provides a construction method is under construction the vibroflotation gravel pile in advance in basic cut-off wall position and upper and lower downstream side certain limit, can develop basic cut-off wall and remaining vibroflotation gravel pile construction simultaneously after accomplishing, can shorten basic processing's time limit for a project on the one hand, and on the other hand also can improve the groove that basic cut-off wall digs the grooving condition. The utility model discloses set up the anti filter bed course in basis at the rubble stake top of shaking towards to protection weak overburden basis avoids taking place the infiltration to destroy under dam retaining back high water head effect.
The utility model discloses to deep weak foundation condition, through the reasonable weak foundation reinforcement and the dam body structure strengthen the processing measure who combines together, realize that foundation strength, bearing capacity and deformation control satisfy the requirement of building the dam, it is significant to earth and rockfill dam engineering damming technique under the complex condition.
Drawings
Fig. 1 is the utility model discloses a shake and dash stone column and rockfill body reinforced earth and rockfill dam soft foundation and handle the structure sketch map.
Figure 2 is a schematic illustration of a rock-fill body reinforcement.
Detailed Description
The present invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the utility model provides a shake and dash stone pile and rockfill body reinforced earth and rockfill dam soft foundation processing structure is applied to build the earth and rockfill dam on the deep weak overburden, the weak overburden depth generally does not exceed 40m, its intensity and bearing capacity can't meet the direct dam building requirement; the utility model discloses a soft base of earth and rockfill dam handles structure mainly contains following part:
the soft foundation treatment structure of the earth and rockfill dam comprises a foundation vibro-replacement gravel pile 1, a foundation impervious wall 2, a foundation reverse filtration cushion zone 3, a dam shell rockfill reinforcement zone 4 at the lower part of the dam body, a dam shell rockfill zone 5 at the upper part of the dam body, a dam body impervious body 6 and the like. The filling material of the foundation vibroflotation gravel pile 1 mainly comprises fresh rock blocks, and the diameter and the row spacing between the arrangement are calculated and determined according to the requirements of bearing capacity and strength; the thickness of the foundation reverse filtering bedding zone 3 is 1-2 m, and artificial crushed stone is adopted and placed on the top of the vibroflotation crushed stone pile; the dam shell rockfill body reinforcement area 4 is positioned at the lower part of the dam shell rockfill body area 5, the reinforcement can be paved in the transverse and longitudinal directions by adopting stainless steel bars or flat steel bars and welded at nodes to form a fixed bidirectional grid, the size of the grid is more than 0.3m and less than the maximum designed particle size of the rockfill, and the height of the reinforcement layering is consistent with the height of the rockfill filling layering. The thickness of the dam shell rock-fill body reinforcement area 4 is determined by calculating the integral settlement deformation of the dam body and the dam foundation, and the condition that the settlement of the top of the dam after the water storage of the reservoir does not exceed 1% of the height of the dam can be met.
The soft foundation treatment structure of the earth and rock dam with the vibroflotation gravel pile and the rockfill body reinforced can be realized by adopting the following construction method:
1) calculating and analyzing the integral settlement deformation of the dam body and the dam foundation before construction, and proposing the requirements on the bearing capacity and the strength of the foundation so as to determine the pile diameter of the vibroflotation gravel pile 1, the row spacing between the arrangement and the thickness of the dam shell rockfill reinforced area 4;
2) constructing the vibroflotation gravel piles 1 on the upper and lower sides of the foundation diaphragm wall 2 at the same time, and constructing one by one in a sequence encryption mode, wherein the foundation vibroflotation gravel pile filling material mainly comprises fresh rock blocks;
3) after the construction of the vibroflotation gravel piles within the range of 10m on each of the upstream and downstream sides of the foundation cut-off wall 2 is completed, the construction of the foundation cut-off wall can be carried out, and meanwhile, vibroflotation gravel piles outside the range of 10m on each of the upstream and downstream sides of the foundation cut-off wall are constructed; the thickness of the foundation impervious wall 2 is determined according to the water head and the structural requirement of the reservoir,
4) after the construction of the vibroflotation gravel pile 1 and the foundation impervious wall 2 is finished, the construction of an upper dam impervious body 6 is carried out, such as a clay core wall or an inclined wall, a geomembrane, an asphalt concrete core wall and the like;
5) after the dam body impervious body 6 is constructed to a certain height, constructing a foundation reverse filtering cushion layer 3 at the top of the gravel pile on the downstream side of the foundation impervious wall 2, wherein the thickness is 1-2 m, and the requirements of reverse filtering and drainage are met by adopting artificial gravel by cushion layer grading and a lower weak covering layer; the inverted filter layers 7 of the upstream surface and the downstream surface of the dam body seepage-proofing body 6 are synchronously constructed during construction;
6) and after the foundation reverse filter bed layer 3 is filled, filling construction of the dam shell rockfill reinforced areas 4 on the upper and lower reaches of the dam impervious body is synchronously carried out. The filling thickness h of the rockfill reinforcement distinguishing layer is 0.5-1 m, and can be determined according to the quality of rockfill materials, and reinforced steel bars or flat steel 32 are laid after filling and rolling of each layer of rockfill 31 are finished; carrying out successive layered construction, wherein the total thickness of the dam shell rockfill reinforced area 4 is H; when the dam shell rockfill reinforcement area 4 is constructed, a transition layer 8 is synchronously constructed between the dam shell rockfill reinforcement area and a reverse filter layer 7 of a dam impervious body, and the transition layer 8 is graded crushed stone with the particle size smaller than that of the rockfill reinforcement area;
7) and after the rockfill reinforcement area 4 is filled, filling an upper dam shell rockfill area 5. And (3) carrying out layered filling construction on the dam shell rockfill area 5 and the dam body seepage-proofing body 6 at the upper part of the dam shell rockfill reinforced area 4, as well as the inverted filter layer 7 and the transition layer 8 on the upstream surface and the downstream surface of the dam body, and keeping the filling height of the dam shell rockfill area 5, the inverted filter layer 7 and the transition layer 8 to be 1-2 layers of the filling height of the dam body seepage-proofing body 6 in the construction process. The dam shell rockfill area 5 can be filled layer by layer at the same height with the inverted filter layer 7 and the transition layer 8.
The above detailed description is provided for explaining the present invention, and is only a preferred embodiment of the present invention, but not for limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made by the present invention are within the scope of the present invention.
Claims (3)
1. The utility model provides a shake soft basic processing structure of rock-fill dam of dashing rubble stake and rockfill body reinforcement, is applied to and builds the earth-rock dam on weak overburden, its characterized in that:
arranging a vibroflotation gravel pile group on the soft covering layer, and reinforcing the deep soft foundation of the dam foundation; the bottom of the gravel pile is positioned on a compact layer of a covering layer or weathered bedrock;
the earth and rockfill dam seepage-proofing system consists of a covering layer foundation seepage-proofing wall and a dam body seepage-proofing body; arranging a foundation reverse filter bed layer on the top of the gravel pile on the downstream side of the impervious wall;
and filling a dam shell rock-fill body reinforcement area on the upper part of the gravel pile on the upstream side of the impervious wall and the upper part of the reverse filter bed layer of the downstream side foundation so as to improve the deformation modulus of the dam material on the lower part of the dam shell and the sedimentation deformation of the dam body caused by homogenizing the weak foundation and avoid the cracking of the dam body caused by uneven sedimentation.
2. The soft foundation treatment structure of the earth-rock dam reinforced by vibro-replacement stone piles and the rockfill body according to claim 1, wherein: the dam shell rockfill body reinforcement area is reinforced by stainless steel bars or flat steel bars and is in a bidirectional grid type, and the reinforcement layering height is consistent with the rockfill filling layering height.
3. The soft foundation treatment structure of the earth-rock dam reinforced by vibro-replacement stone piles and the rockfill body according to claim 1, wherein: the dam impervious body is a soil core wall or an inclined wall, a geomembrane core wall or an inclined wall and an asphalt concrete core wall.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021356571.6U CN213390201U (en) | 2020-07-10 | 2020-07-10 | Earth-rock dam soft foundation treatment structure with reinforced vibro-replacement gravel pile and rockfill |
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| CN202021356571.6U CN213390201U (en) | 2020-07-10 | 2020-07-10 | Earth-rock dam soft foundation treatment structure with reinforced vibro-replacement gravel pile and rockfill |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117574524A (en) * | 2024-01-16 | 2024-02-20 | 中水君信工程勘察设计有限公司 | Method for treating earth-rock dam foundation vibroflotation gravel pile |
| CN117702714A (en) * | 2024-02-05 | 2024-03-15 | 中科信德建设有限公司 | Reservoir dam structure stability monitoring method based on vibroflotation gravel pile treatment |
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2020
- 2020-07-10 CN CN202021356571.6U patent/CN213390201U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117574524A (en) * | 2024-01-16 | 2024-02-20 | 中水君信工程勘察设计有限公司 | Method for treating earth-rock dam foundation vibroflotation gravel pile |
| CN117574524B (en) * | 2024-01-16 | 2024-03-19 | 中水君信工程勘察设计有限公司 | Method for treating earth-rock dam foundation vibroflotation gravel pile |
| CN117702714A (en) * | 2024-02-05 | 2024-03-15 | 中科信德建设有限公司 | Reservoir dam structure stability monitoring method based on vibroflotation gravel pile treatment |
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