CN110735437B - Side slope combined protection structure - Google Patents
Side slope combined protection structure Download PDFInfo
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- CN110735437B CN110735437B CN201910959775.4A CN201910959775A CN110735437B CN 110735437 B CN110735437 B CN 110735437B CN 201910959775 A CN201910959775 A CN 201910959775A CN 110735437 B CN110735437 B CN 110735437B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
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Abstract
The invention discloses a side slope combined protection structure, which is used for being installed on a side slope and is characterized in that: the slope combined protection structure comprises a common anchor rod, a gravity type retaining wall, a damping layer, a yielding anchor rod and a drainage ditch; the side slope comprises a side slope sliding layer and a side slope bed rock layer; the yielding anchor rod is inserted on the side slope and extends into the side slope bedrock layer; the shock absorption layer is arranged on the lower side of the slope slip layer in a blocking mode, and the gravity type retaining wall is fixed on the lower side of the foundation layer and is tightly attached to one side face, back to the slope slip layer, of the shock absorption layer; the common anchor rod is vertically inserted into the gravity type retaining wall and extends downwards into the side slope bed rock layer. The gravity type retaining wall can not only play the role of bearing the soil pressure of the gravity type retaining wall, but also bear large deformation under the earthquake, can improve the allowable displacement, the anti-sliding and anti-overturning capacity of the gravity type retaining wall, reduce the stress of the gravity type retaining wall and avoid the damage under the action of strong earthquake.
Description
Technical Field
The invention relates to the technical field of side slope anti-seismic support of geotechnical engineering, in particular to a side slope combined protection structure.
Background
In the side slope earthquake-proof design, the earthquake mainly acts on the side slope structure in two aspects of additional earthquake force and displacement. Conventional seismic methods often increase the seismic capacity of the structure from a force-bearing standpoint, i.e., by increasing the stiffness of the structure (e.g., increasing the size of the structure). However, a phenomenon is found after the Wenchun earthquake, the gravity type retaining wall is seriously damaged under the action of the strong earthquake, the earthquake resistance is completely realized by a method of improving the section size and increasing the structural rigidity, and the method is not practical under the action of high intensity and strong earthquake.
The main reasons are as follows: slope protective structure often warp great under the earthquake effect, but gravity type retaining wall is because self weight is big, and is comparatively sensitive to the displacement, can't bear so big earthquake deformation, and gravity type retaining wall is changeed than flexible structure and destroys on the contrary under the earthquake induced big deformation condition. Therefore, a shock-absorbing layer soil wall combined structure is urgently needed to replace the traditional gravity type retaining wall, so that the performance requirement that the gravity type retaining wall can bear the soil pressure and can bear the large deformation under the earthquake can be met, the instability and the damage of the gravity type retaining wall under the earthquake action are avoided, and the life and property safety of the masses is effectively guaranteed.
Through retrieval, the three published domestic application numbers 201710645357.9, 201811151089.6 and 201810907936.0 have certain shock absorption effect and certain defects, and the three patent designs only carry out local shock absorption on a supporting and retaining structure at the middle lower part of the side slope, cannot resist the medium and strong shock effect aiming at the small and micro earthquake effect and have insufficient anti-overturning capability; under the action of strong earthquake, the upper part of the side slope generates larger earthquake force, the single gravity type retaining wall structure can not reduce the earthquake acting force generated by the side slope, and the side slope still faces the danger of instability and damage.
Disclosure of Invention
In view of one or more defects in the prior art, the invention provides a side slope combined protection structure, which can not only play a role of bearing soil pressure of a gravity type retaining wall, but also bear large deformation under an earthquake, can also play a role of damping the middle upper part of a side slope by a pressure yielding anchor rod, and can avoid the performance requirement of destabilization and damage of the gravity type retaining wall under the earthquake action.
In order to achieve the purpose, the invention provides a side slope combined protection structure, which is used for being installed on a side slope (6), and is characterized in that: the side slope combined protection structure comprises a common anchor rod (1), a gravity type retaining wall (2), a shock absorption layer (3), a yielding anchor rod (4) and a drainage ditch (5); the side slope (6) comprises a side slope sliding layer (6-1) and a side slope foundation layer (6-2); the yielding anchor rod (4) is inserted on the slope sliding layer (6-1) and extends into the slope foundation layer (6-2); the shock absorption layer (3) is arranged at the low side of the slope sliding layer (6-1) in a blocking mode, and the gravity type retaining wall (2) is fixed on the low side of the foundation layer (6-2) and is tightly attached to one side face, back to the slope sliding layer (6-1), of the shock absorption layer (3); the drainage ditch (5) is close to the gravity type retaining wall (2) and is positioned on one side back to the side slope foundation stratum (6-2); the common anchor rod (1) is vertically inserted into the gravity type retaining wall (2) and extends downwards into the side slope foundation layer (6-2).
Preferably, the yielding anchor rod (4) comprises an outer blocking cap (4-1), a rod body (4-2), an extrusion sleeve (4-3), a supporting cover (4-4) and a grouting cap (4-5); a rod body mounting hole (6-3) is formed in the side slope (6), and the grouting cap (4-5) is fixedly arranged in the rod body mounting hole (6-3); the rod body (4-2) is provided with an S-shaped inner rod section (4-21) and an outer straight rod section (4-22); the S-shaped inner rod section (4-21) is positioned in the rod body mounting hole (6-3), and the inner end of the S-shaped inner rod section (4-21) is fixedly connected with the grouting cap (4-5); the supporting cover (4-4) comprises a cover body (4-41) and a slope outer baffle (4-42) arranged at the circumferential edge of the cover body (4-41), an outer straight rod section through hole (4-43) is formed in the center of the cover body (4-41), and the outer straight rod section (4-22) penetrates through the outer straight rod section through hole (4-43) outwards and then is sequentially connected with an extrusion sleeve (4-3) and an outer baffle cap (4-1); the extrusion sleeve (4-3) is in interference fit with the outer straight rod section (4-22), and the outer blocking cap (4-1) is fixedly connected with the outer straight rod section (4-22); the inner end of the extrusion sleeve (4-3) is abutted against the outer wall of the cover body (4-41), and a gap (a) is formed between the outer end of the extrusion sleeve (4-3) and the outer blocking cap (4-1); the bottom in the rod body mounting hole (6-3) is provided with a wave-absorbing cavity (6-4).
Preferably, the outer blocking cap (4-1) adopts a nut which is in threaded fit with the outer straight rod section (4-22).
Preferably, the shock absorption layer (3) is made of EPS (expanded polystyrene) plates, and the thickness of the shock absorption layer is 0.3-0.6 m.
The invention has the beneficial effects that:
firstly, the invention allows the slope sliding layer behind the gravity type retaining wall to deform to a certain extent under the action of an earthquake, converts earthquake energy into deformation energy of the slope sliding layer and reduces the stress of the gravity type retaining wall;
secondly, the vertical common anchor rods are arranged on the gravity type retaining wall, so that the anti-erosion and anti-sliding damage capabilities of the gravity type retaining wall are improved, and the stability of the structure is improved;
thirdly, the yielding anchor rods are arranged between the slope sliding layer and the slope foundation layer, so that multi-stage progressive shock absorption, yielding, wave absorption and the like can be realized, and the downward sliding force and the deformation extrusion force of the slope sliding layer are reduced; meanwhile, the yielding anchor rod has multiple yield capacities relative to a common anchor rod, can generate extra deformation, can allow a support slope sliding layer (such as a soil body) to deform when a strong earthquake action is encountered, converts earthquake energy into deformation energy of the slope sliding layer (such as the soil body), and improves the bearing capacity of the yielding anchor rod in a step-by-step self-adaptive manner after the deformation exceeds a certain degree, so that the slope sliding layer (such as the soil body) of the side slope can be prevented from further deforming, and the slope sliding layer (such as the soil body) of the side slope can not be unstably damaged under the action of the strong earthquake;
fourthly, the allowable displacement of the gravity retaining wall can be improved, and damage under the action of strong earthquake can be avoided; meanwhile, the downward sliding force of the side slope is reduced, and the stress of the gravity retaining wall is reduced; secondly, the anti-sliding and anti-overturning capacity of the gravity type retaining wall is improved, the advantages of a combined supporting structure are exerted, and the stability of the side slope under the action of an earthquake is improved;
fifthly, the invention can not only play a role of the gravity type retaining wall in bearing the soil pressure, but also bear the large deformation under the earthquake, and also play a role of the yielding anchor rod in damping the middle upper part of the side slope, thereby avoiding the performance requirement of the gravity type retaining wall on instability and damage under the earthquake.
Drawings
Fig. 1 is a schematic structural view of a combined slope protection structure according to the present invention.
Fig. 2 is a sectional view a-a in fig. 1.
Fig. 3 is a schematic structural diagram of the yielding rock bolt in the invention before yielding.
Fig. 4 is a schematic structural diagram of the yielding rock bolt of the invention after yielding.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
referring to fig. 1-4, a slope combined protection structure is used for being installed on a slope 6 and comprises a common anchor rod 1, a gravity type retaining wall 2, a shock absorption layer 3, yielding anchor rods 4 and a drainage ditch 5.
Specifically, the common anchor rod 1 may be a common steel wire rope mortar anchor rod, an inverted wedge type metal anchor rod or a pipe seam type anchor rod, a cement anchor rod, or the like.
The slope 6 comprises a slope sliding layer 6-1 and a slope bedrock layer 6-2. The slope slide layer 6-1 is geologically different from the slope bed rock layer 6-2.
The layer separation surface of the slope sliding layer 6-1 and the slope foundation layer 6-2. When the slope sliding layer 6-1 slides downwards, the slope sliding layer slides downwards along the layered surface.
The yielding anchor rod 4 is inserted on the slope sliding layer 6-1 and extends into the slope foundation layer 6-2.
In this embodiment, the yielding anchor rods 4 are provided with a plurality of numbers and are installed along the slope 6 at intervals.
In the embodiment, the yielding anchor rod 4 comprises an outer blocking cap 4-1, a rod body 4-2, an extrusion sleeve 4-3, a supporting cover 4-4 and a grouting cap 4-5; a rod body mounting hole 6-3 is formed in the side slope 6, and the grouting cap 4-5 is fixedly arranged in the rod body mounting hole 6-3; the rod body 4-2 is provided with an S-shaped inner rod section 4-21 and an outer straight rod section 4-22; the S-shaped inner rod section 4-21 is positioned in the rod body mounting hole 6-3, and the inner end of the S-shaped inner rod section 4-21 is fixedly connected with the grouting cap 4-5; the supporting cover 4-4 comprises a cover body 4-41 and a side slope outer baffle 4-42 arranged at the circumferential edge of the cover body 4-41, an outer straight rod section through hole 4-43 is arranged at the center of the cover body 4-41, and the outer straight rod section 4-22 penetrates out of the outer straight rod section through hole 4-43 and then is sequentially connected with an extrusion sleeve 4-3 and an outer baffle cap 4-1; the extrusion sleeve 4-3 is in interference fit with the outer straight rod section 4-22, and the outer retaining cap 4-1 is fixedly connected with the outer straight rod section 4-22; the inner end of the extrusion sleeve 4-3 is abutted against the outer wall of the cover body 4-41, and a gap a is formed between the outer end of the extrusion sleeve 4-3 and the outer blocking cap 4-1; the bottom in the rod body mounting hole 6-3 is provided with a wave-absorbing cavity 6-4.
Referring to fig. 1 to 4, a rod body mounting hole 6-3 is drilled in the side slope 6, and the rod body mounting hole 6-3 penetrates into the side slope basement rock layer 6-2.
Referring to fig. 3, before the yielding anchor rod yields, a gap a is formed between the outer end of the extrusion sleeve 4-3 and the outer blocking cap 4-1, and the S-shaped inner rod section 4-21 on the rod body 4-2 inside the rod body mounting hole 6-3 of the side slope 6 is bent in an S-shape (or snake shape). When a strong earthquake occurs, on one hand, due to the existence of the wave-absorbing cavity 6-4, the effect of the earthquake on the side slope is reduced according to the air wave-absorbing principle, and the destructive effect caused by the earthquake is weakened; on the other hand, a strong earthquake will induce a large deformation of the side slope, because the cover body 4-41 of the support cover 4-4 and the side slope outer baffle 4-42 at the peripheral edge thereof form a support structure and coordinate with the deformation of the side slope, the rod body 4-2 will deform under stress, at this time, the S-shaped inner rod section 4-21 of the rod body 4-2 is straightened at first (see fig. 4), when the deformation of the side slope is gradually increased, the S-shaped inner rod section 4-21 of the rod body 4-2 bears a pulling force exceeding the gripping resistance generated between the extrusion sleeve 4-3 and the outer straight rod section 4-22 in interference fit, the support cover 4-4 will generate a constant resistance yielding slip along the outer straight rod section 4-22, so as to adapt to the large deformation of the side slope, ensure the safety of the structure, and meanwhile, the cover body 4-41 of the support cover 4-4 can accommodate a certain amount of extrusion of deformation of the side slope, at the same time, the cover 4-41 will deform to a certain extent and generate an increasing bearing resistance.
This let pressure stock adopt above-mentioned design, and it has an advantage: the yielding anchor rod utilizes the principle of air wave absorption, and reduces the slope caused by earthquake by means of the wave absorption cavity 6-4, thereby reducing the deformation of the slope under the action of earthquake; the yielding anchor rod utilizes the S-shaped inner rod section 4-21, when earthquake occurs, the S-shaped inner rod section 4-21 is pulled to be straightened, so that the side slope is subjected to additional deformation, partial earthquake energy is converted into primary deformation energy of the side slope sliding layer 6-1 (such as soil mass), and the stress of the anchor rod is reduced; a clearance a is reserved between the outer end of an extrusion sleeve 4-3 and an outer blocking cap 4-1 of the yielding anchor rod, and the sliding length of a supporting cover 4-4 is reserved, when the axial force borne by the yielding anchor rod exceeds the static friction force between the extrusion sleeve 4-3 and the outer straight rod section 4-22, the supporting cover 4-4 generates constant-resistance yielding sliding along the outer straight rod section 4-22, on one hand, the integral bearing capacity of the anchor rod is ensured, and on the other hand, the slope is allowed to generate large deformation through a unique yielding structure, so that other part of seismic energy is converted into secondary deformation energy of a slope sliding layer 6-1 (such as a soil body); when the integral deformation of the anchor rod exceeds a certain degree, the integral bearing capacity of the anchor rod is improved, and the rock mass can be prevented from further deforming, so that the rod body 4-2 cannot be damaged under the action of a strong earthquake; the yielding anchor rod can have the characteristics of yielding, wave absorption, shock absorption and the like at the same time, can allow slope soil to deform and can utilize the wave absorption and shock absorption effects of air at the same time, greatly reduces the acting force of an earthquake on a supporting structure (such as the yielding anchor rod 4 and the gravity type retaining wall 2), ensures the retaining capacity of the supporting structure, and ensures that the slope sliding layer 6-1 cannot be unstably damaged under the strong earthquake effect.
In this embodiment, the outer stop cap 4-1 is a nut that is threadedly engaged with the outer straight rod segment 4-22.
The shock absorption layer 3 is arranged on the lower side of the side slope sliding layer 6-1 in a blocking mode and slides downwards due to the fact that the side slope sliding layer 6-1 is blocked.
The gravity type retaining wall 2 is fixed on the low side of the foundation layer 6-2 and is tightly attached to one side face, back to the side slope sliding layer 6-1, of the shock absorption layer 3.
Therefore, the gravity retaining wall 2 and the shock-absorbing layer 3 are closely attached to each other and abut against the lower side surface of the slope sliding layer 6-1 to protect and block the lower side surface.
The drainage ditch 5 is close to the gravity type retaining wall 2 and is positioned on one side back to the side slope foundation layer 6-2; the common anchor rods 1 are vertically inserted into the gravity type retaining wall 2 and extend downwards into the side slope foundation layer 6-2.
Because the damping layer 3 is arranged on the side, facing the slope foundation layer 6-2, of the gravity type retaining wall 2, when a large earthquake acts, the damping layer 3 is used for damping, so that the gravity type retaining wall 2 is allowed to deform to a certain extent, the earthquake energy is absorbed, and the impact force borne by the wall body is reduced; secondly install and construct vertical ordinary stock 1 at gravity type retaining wall 2, its main effect lies in reinforcing gravity type retaining wall 2's cling force, prevents that gravity type retaining wall 2 from taking place to incline and the horizontal slip destruction, increases gravity type retaining wall 2 resistance ability and stability.
Preferably, the shock-absorbing layer 3 is made of EPS (expandable polystyrene) plate with the thickness of 0.3-0.6 m. The damping layer 3 adopts a polystyrene foam plate, and has the following advantages: firstly, the polystyrene foam board has small density coefficient and good impact resistance, and has enough capacity to buffer the external impact force by changing and restoring the shape; secondly, the polystyrene foam board has an independent bubble structure, and the damage of a small area cannot affect the whole wall body; thirdly, the polystyrene foam board has low surface water absorption rate and good anti-permeability performance, and can effectively avoid the wall surface problems of mildewing, falling off and the like after the wall surface is affected with damp; thirdly, the polystyrene foam board is not affected by air temperature, and the polystyrene foam board can not melt and flow due to overhigh temperature at high temperature and can not be brittle because of overlow temperature at low temperature.
Preferably, the gravity retaining wall 2 is made of common concrete gravity retaining wall, and the concrete grade should not be less than C30.
The invention has the following advantages and is analyzed as follows:
firstly, the invention allows the slope sliding layer 6-1 behind the gravity type retaining wall 2 to deform to a certain extent under the action of earthquake, converts the earthquake energy into the deformation energy of the slope sliding layer 6-1, and reduces the stress of the gravity type retaining wall 2;
secondly, the gravity type retaining wall 2 is provided with the vertical common anchor rods 1, so that the anti-erosion and anti-sliding damage capabilities of the gravity type retaining wall 2 are improved, and the structural stability is improved;
thirdly, the yielding anchor rod 44 is arranged between the slope sliding layer 6-1 and the slope foundation layer 6-2, so that multi-stage progressive shock absorption, yielding, wave absorption and the like can be realized, and the downward sliding force and the deformation extrusion force of the slope sliding layer 6-1 are reduced; meanwhile, the yielding anchor rod has multiple yield capacities relative to a common anchor rod, can generate extra deformation, can allow the side slope sliding layer 6-1 (such as a soil body) to deform when a strong earthquake action is encountered, converts the earthquake energy into the deformation energy of the side slope sliding layer 6-1 (such as the soil body), and improves the bearing capacity of the yielding anchor rod 4 in a step-by-step self-adaptive manner after the deformation exceeds a certain degree, so that the side slope sliding layer 6-1 (such as the soil body) can be prevented from further deforming, and the side slope sliding layer 6-1 (such as the soil body) of the side slope can not be unstably damaged under the strong earthquake action;
fourthly, the damping layer 3 is arranged, so that the allowable displacement of the gravity retaining wall can be improved, and the damage under the action of strong earthquake can be avoided; meanwhile, the downward sliding force of the side slope is reduced, and the stress of the gravity retaining wall 2 is reduced; secondly, the anti-sliding and anti-overturning capacity of the gravity type retaining wall 2 is improved, the advantages of a combined supporting structure are exerted, and the stability of the side slope under the action of an earthquake is improved;
fifthly, the invention can not only play a role of the gravity type retaining wall in bearing the soil pressure, but also bear the large deformation under the earthquake, and can also play a role of the yielding anchor rod in damping the middle upper part of the side slope, thereby avoiding the performance requirement of instability damage of the gravity type retaining wall under the earthquake action.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (3)
1. The utility model provides a side slope combined protection structure, this side slope combined protection structure is used for installing on side slope (6), its characterized in that:
the side slope combined protection structure comprises a common anchor rod (1), a gravity type retaining wall (2), a shock absorption layer (3), a yielding anchor rod (4) and a drainage ditch (5);
the side slope (6) comprises a side slope sliding layer (6-1) and a side slope foundation layer (6-2);
the yielding anchor rod (4) is inserted on the slope sliding layer (6-1) and extends into the slope foundation layer (6-2);
the shock absorption layer (3) is arranged at the low side of the slope sliding layer (6-1) in a blocking mode, and the gravity type retaining wall (2) is fixed on the low side of the foundation layer (6-2) and is tightly attached to one side face, back to the slope sliding layer (6-1), of the shock absorption layer (3);
the drainage ditch (5) is close to the gravity type retaining wall (2) and is positioned on one side back to the side slope foundation stratum (6-2);
the common anchor rod (1) is vertically inserted on the gravity type retaining wall (2) and extends downwards into the side slope foundation layer (6-2);
the yielding anchor rod (4) comprises an outer blocking cap (4-1), a rod body (4-2), an extrusion sleeve (4-3), a supporting cover (4-4) and a grouting cap (4-5);
a rod body mounting hole (6-3) is formed in the side slope (6), and the grouting cap (4-5) is fixedly arranged in the rod body mounting hole (6-3);
the rod body (4-2) is provided with an S-shaped inner rod section (4-21) and an outer straight rod section (4-22);
the S-shaped inner rod section (4-21) is positioned in the rod body mounting hole (6-3), and the inner end of the S-shaped inner rod section (4-21) is fixedly connected with the grouting cap (4-5);
the supporting cover (4-4) comprises a cover body (4-41) and a slope outer baffle (4-42) arranged at the circumferential edge of the cover body (4-41), an outer straight rod section through hole (4-43) is formed in the center of the cover body (4-41), and the outer straight rod section (4-22) penetrates through the outer straight rod section through hole (4-43) outwards and then is sequentially connected with an extrusion sleeve (4-3) and an outer baffle cap (4-1);
the extrusion sleeve (4-3) is in interference fit with the outer straight rod section (4-22), and the outer blocking cap (4-1) is fixedly connected with the outer straight rod section (4-22);
the inner end of the extrusion sleeve (4-3) is abutted against the outer wall of the cover body (4-41), and a gap (a) is formed between the outer end of the extrusion sleeve (4-3) and the outer blocking cap (4-1);
the bottom in the rod body mounting hole (6-3) is provided with a wave-absorbing cavity (6-4).
2. A slope combined protecting structure as claimed in claim 1, wherein: the outer blocking cap (4-1) adopts a nut which is in threaded fit with the outer straight rod section (4-22).
3. A slope combined protective structure according to any one of claims 1-2, characterised in that: the shock absorption layer (3) is made of EPS (expandable polystyrene) plates, and the thickness of the shock absorption layer is 0.3-0.6 m.
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| CN201910959775.4A CN110735437B (en) | 2019-10-10 | 2019-10-10 | Side slope combined protection structure |
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| CN111455994A (en) * | 2020-04-21 | 2020-07-28 | 中铁西北科学研究院有限公司 | Tuned damping type BFRP anchor cable head shock absorption yield structure and method for high-intensity seismic region |
| CN112016144B (en) * | 2020-08-17 | 2022-04-22 | 华东交通大学 | Method for calculating displacement of flexible cantilever retaining wall in multilayer soil under earthquake action |
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| CN201857612U (en) * | 2010-11-11 | 2011-06-08 | 中国科学院武汉岩土力学研究所 | Extending-elastic rock-burst-resistant anchor rod |
| CN102392662A (en) * | 2011-10-28 | 2012-03-28 | 湖南科技大学 | Bent dynamic and static combined anchor rod |
| CN203403426U (en) * | 2013-08-13 | 2014-01-22 | 南昌工程学院 | Supporting structure of expensive earth road cutting side slope |
| WO2015059579A2 (en) * | 2013-10-23 | 2015-04-30 | Anchor Systems (Europe) Ltd. | Anchor post |
| CN107201703B (en) * | 2017-08-01 | 2023-07-11 | 四川睿铁科技有限责任公司 | Roadbed supporting and damping structure in earthquake region and construction method thereof |
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