Subway station box type retaining wall structure and construction method

Abstract

The invention belongs to the technical field of subway station building construction, and discloses a subway station box type retaining wall structure and a construction method. Aiming at the problems existing in the prior art, the rigid connecting structure of the station crown beam and the station enclosure structure is adopted, so that the overall rigidity is increased, then the retaining wall bottom plate is rigidly connected with the station crown beam, and the retaining wall waist beam and the supporting beam force transmission component are arranged, so that the bottom constraint of the retaining wall structure is enhanced. The retaining wall structure can meet the stress requirement of a pedestrian path or a roadway, and the overall stability performance is good. The whole construction method is reasonable in design, simple, convenient, feasible, safe, reliable and convenient to construct.

Description

Technical Field

[0001] The invention belongs to the technical field of subway station building construction, and in particular relates to a subway station box-type retaining wall structure and a construction method. Background Art

[0002] With the vigorous development of rail transit projects in my country, subway station construction forms are diverse and the terrain is becoming more and more complex. When a subway station or its ancillary is adjacent to a slope, firstly, during the excavation stage of the foundation pit, due to the large-scale unloading of the passive area, considering the influence of the overload of the active area slope, the passive earth pressure cannot resist the active earth pressure on the slope side, and the foundation pit has the potential risk of deformation and instability; secondly, as an important public transportation facility, the subway has a large passenger flow. During the construction and operation of the station, the slope adjacent to the subway needs to remain stable at all times. Especially for subway stations located in the core area of ​​the city, the utilization rate of land resources is tight, and the slope side is often used as a pedestrian walkway or roadway, so the stability of the slope becomes more important.

[0003] At present, most slope support schemes adopt gravity retaining walls or cantilever piles. The structures are independently set. During the foundation pit excavation stage, the loss of soil pressure in the passive zone caused by unloading soil is very likely to cause the retaining components to slip and overturn. In addition, a large amount of reinforced concrete is used, the cost is high, and the construction period is long.

[0004] Therefore, it is necessary to invent a retaining structure and construction method close to the subway station, strengthen the connection between the retaining structure and the station structure, and effectively transmit the active earth pressure on the slope side through the load-bearing components. This can not only ensure the stability of the station foundation pit and the stability of the slope itself during the foundation pit excavation stage, but also serve as a pedestrian walkway or vehicle walkway under permanent operating conditions, saving land resource utilization, reducing risks during construction and operation, and ensuring the safety of people’s lives and property. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a box-type retaining wall structure for a subway station, aiming to solve the problems existing in the prior art.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A box-type retaining wall structure for a subway station, comprising a side slope, a station top slab backfill, a station crown beam, a station enclosure structure, a station structure and a retaining wall structure;

[0008] The station roof backfill soil is arranged on one side of the slope, and the top of the slope is higher than the top of the station roof backfill soil;

[0009] The station structure is arranged in the soil body of the station top plate backfill soil through the station enclosure structure, and the station cap beam is arranged on the top of the station enclosure structure;

[0010] The retaining wall structure includes retaining wall side walls, retaining wall waist beams, retaining wall cross beams, retaining wall support beams, retaining wall bottom plates, retaining wall top plates and retaining wall backfill materials. The retaining wall side walls, retaining wall top plates and retaining wall bottom plates are arranged in the soil of the slope. The retaining wall side walls, retaining wall top plates and retaining wall bottom plates are connected to form a retaining wall cavity for placing the retaining wall backfill materials. The retaining wall waist beam is arranged on the retaining wall side walls. The retaining wall cross beam is arranged in the retaining wall cavity through the retaining wall waist beam. The two ends of the retaining wall support beam are respectively connected to the retaining wall waist beam and the station crown beam. One end of the retaining wall bottom plate extends out from the soil of the slope and is connected to the station crown beam.

[0011] Preferably, a pedestrian walkway or a vehicle walkway is provided on the top of the slope.

[0012] Preferably, the station enclosure structure is a enclosure pile or a ground-connected wall, and the station enclosure structure is arranged around the four sides of the station structure.

[0013] Preferably, the cross-sectional shape of the station crown beam is the same as that of the station enclosure structure, the top of the station enclosure structure is located inside the station crown beam, and the station crown beam is provided with a steel bar connector connected to one end of the retaining wall support beam and the retaining wall bottom plate.

[0014] Preferably, the top of the waist beam of the retaining wall is flush with the top of the backfill soil of the station roof;

[0015] The width of the retaining wall waist beam is consistent with the width of the retaining wall side wall, and the retaining wall waist beam is embedded in the retaining wall side wall;

[0016] Or the width of the retaining wall waist beam is greater than the width of the retaining wall side wall, and the retaining wall waist beam protrudes from the retaining wall side wall.

[0017] Preferably, the number of the retaining wall beams is more than two and they are evenly distributed along the length direction of the retaining wall side wall;

[0018] The retaining wall support beams are evenly distributed along the length direction of the retaining wall side walls and correspond to the positions of the retaining wall cross beams.

[0019] Preferably, a railing is provided on the top edge of the retaining wall top plate.

[0020] The present invention also includes a construction method of a subway station box-type retaining wall structure, which is applied to the above-mentioned subway station box-type retaining wall structure and includes the following steps:

[0021] S1. Before excavating the foundation pit of a subway station, the slope is cut by slope reduction. If there is no slope reduction condition, temporary support is used to ensure the stability of the slope.

[0022] S2. Construct the station enclosure structure around the station structure: first set up the station enclosure structure, then set up the station crown beam, and connect the top of the station enclosure structure with the station crown beam, and reserve a steel bar connector on the side of the station crown beam;

[0023] S3. Perform foundation treatment at the location where the retaining wall bottom plate is set in the soil of the slope, and use strong tamping or replacement method to improve the bearing capacity of the foundation;

[0024] S4. After the foundation treatment is completed, the retaining wall structure is cast from bottom to top: first, the steel bars of the retaining wall bottom plate are connected to the steel bar connectors of the station crown beam, and then the retaining wall bottom plate is cast, and cast with the station crown beam to form the first fixed support;

[0025] S5. Complete the synchronous binding of the steel bars of the retaining wall side wall, the retaining wall waist beam, and the retaining wall cross beam and pour concrete, and set a steel bar connector at the retaining wall waist beam. After the concrete strength reaches the design requirements, carry out the construction of the retaining wall support beam: connect the steel bar at one end of the retaining wall support beam to the steel bar connector at the retaining wall waist beam, and connect the steel bar at the other end to the steel bar connector at the station crown beam, and cast the retaining wall support beam and the station crown beam to form a second fixed support;

[0026] S6. After the concrete strength of the retaining wall bottom plate, retaining wall side wall, retaining wall waist beam, retaining wall cross beam and retaining wall support beam reaches the design strength, the retaining wall backfill is placed in the retaining wall cavity. After the backfill height of the retaining wall backfill reaches the design elevation, the retaining wall top plate is cast;

[0027] S7. After the above steps are completed, the station foundation pit is excavated. During the excavation process, the deformation and settlement of the station enclosure structure and the retaining wall structure are monitored. After the station structure is completed, the top plate is covered with soil to form the station top plate backfill soil, the road structure of the retaining wall top plate and the top of the slope is restored, and the railings are installed.

[0028] Preferably, in step S3, a 50 mm thick C20 plain concrete cushion layer is provided below the retaining wall bottom plate.

[0029] Preferably, in step S6, the backfill height of the retaining wall backfill material refers to the design elevation: determined according to the anti-slip and anti-overturning calculations of the retaining wall, with reference to the "Technical Code for Building Foundation Pit Support JGJ 120-2012", the anti-slip stability safety factor is greater than or equal to 1.2, and the anti-overturning safety factor is greater than or equal to 1.3.

[0030] Compared with the prior art, the beneficial effects of the present invention include:

[0031] The box-type retaining wall structure of the subway station of the present application is combined with the construction method to form an effective force transmission path, with reliable node connections, strong bearing capacity, and a simple and feasible construction method. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0033] Figure 1 It is a schematic diagram of the interior of the box-type retaining wall structure of a subway station of the present invention in the front view.

[0034] Figure 2 It is an internal schematic diagram of the box-type retaining wall structure of a subway station of the present invention, viewed from above.

[0035] Figure 3 for Figure 1 Schematic diagram of the method for marking A.

[0036] in:

[0037] 1-slope, 2-station top slab backfill, 3-station cap beam, 4-station enclosure structure, 5-station structure, 6-retaining wall side walls, 7-retaining wall waist beam, 8-retaining wall cross beam, 9-retaining wall support beam, 10-retaining wall bottom slab, 11-retaining wall top slab, 12-retaining wall backfill, 13-railing. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the embodiments described are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0040] Example:

[0041] See also Figure 1-Figure 3 , a box-type retaining wall structure of a subway station, comprising a slope 1, a station top slab backfill 2, a station cap beam 3, a station enclosure structure 4, a station structure 5 and a retaining wall structure;

[0042] The station roof backfill soil 2 is arranged on one side of the slope 1, and the top of the slope 1 is higher than the top of the station roof backfill soil 2;

[0043] The station structure 5 is arranged in the soil of the station top plate backfill soil 2 through the station enclosure structure 4, and the station cap beam 3 is arranged on the top of the station enclosure structure 4;

[0044] The retaining wall structure includes a retaining wall side wall 6, a retaining wall waist beam 7, a retaining wall cross beam 8, a retaining wall support beam 9, a retaining wall bottom plate 10, a retaining wall top plate 11 and a retaining wall backfill material 12. The retaining wall side wall 6, the retaining wall top plate 11 and the retaining wall bottom plate 10 are arranged in the soil of the slope 1. The retaining wall side wall 6, the retaining wall top plate 11 and the retaining wall bottom plate 10 are connected to form a retaining wall cavity for placing the retaining wall backfill material 12. The retaining wall waist beam 7 is arranged on the retaining wall side wall 6. The retaining wall cross beam 8 is arranged in the retaining wall cavity through the retaining wall waist beam 7. The two ends of the retaining wall support beam 9 are respectively connected to the retaining wall waist beam 7 and the station crown beam 3. One end of the retaining wall bottom plate 10 extends out from the soil of the slope 1 and is connected to the station crown beam 3.

[0045] In this embodiment, a pedestrian walkway or a vehicle road is arranged on the top of the slope 1 .

[0046] The station enclosure structure 4 of this embodiment is a enclosure pile or a ground-connected wall, and the station enclosure structure 4 is arranged around the station structure 5; when it is a enclosure pile structure, its diameter can be selected to be 800mm or 1000mm, and when it is a ground-connected wall structure, its thickness can be selected to be 800mm or 1000mm.

[0047] The cross-sectional shape of the station crown beam 3 of this embodiment is the same as that of the station enclosure structure 4. The top of the station enclosure structure 4 is in the station crown beam 3. The station crown beam 3 is provided with a steel bar connector connected to one end of the retaining wall support beam 9 and the retaining wall bottom plate 10. More specifically, the station crown beam 3 is made of C35 concrete, with dimensions of 1000 mm in width and 800 mm in height. The top of the station enclosure structure 4 extends into the station crown beam 3 to a depth of 100 mm. The main reinforcement at the top of the station enclosure structure 4 is anchored in the station crown beam 3, so that the restraining effect of the top of the station enclosure structure 4 can be strengthened.

[0048] The top of the retaining wall waist beam 7 of this embodiment is flush with the top of the station roof backfill soil 2; the retaining wall waist beam 7 is made of C35 concrete and has dimensions of: width 400mm to 600mm, height 500mm to 800mm;

[0049] There are two specific width dimensions:

[0050] The first type: the width of the retaining wall waist beam 7 is consistent with the width of the retaining wall side wall 6, and the retaining wall waist beam 7 is embedded in the retaining wall side wall 6;

[0051] The second type: the width of the retaining wall waist beam 7 is greater than the width of the retaining wall side wall 6, and the retaining wall waist beam 7 protrudes from the retaining wall side wall 6.

[0052] The retaining wall cross beam 8 of this embodiment is made of C35 concrete, with dimensions of 500mm to 800mm in width and 500mm to 800mm in height. There are more than two of them and they are evenly distributed along the length direction of the retaining wall side wall 6. Specifically, a retaining wall cross beam 8 is arranged every 3m to 5m. At the same time, the height position of the retaining wall cross beam 8 is consistent with that of the retaining wall waist beam 7. The steel bars at both ends of the retaining wall cross beam 8 are anchored into the retaining wall waist beam 7 to form a force transmission component.

[0053] The retaining wall support beam 9 of this embodiment is made of C35 concrete, and its width is the same as that of the retaining wall waist beam 7. The retaining wall support beam 9 is evenly distributed along the length direction of the retaining wall side wall 6 and corresponds to the position of the retaining wall cross beam 8. The steel bars at one end of the retaining wall support beam 9 are anchored into the retaining wall waist beam 7 and rigidly connected to the retaining wall waist beam 7; the steel bars at the other end are rigidly connected to the station crown beam 3 through the steel bar connector reserved on the side of the station crown beam 3 to form a force transmission component.

[0054] The retaining wall bottom plate 10 of this embodiment is made of C35 concrete, with a thickness of 300mm to 500mm, and a width equal to the sum of the overall width of the retaining wall structure and the distance from the retaining wall structure to the three sides of the station crown beam. The retaining wall bottom plate 10 is rigidly connected to the station crown beam 3 through the steel bar connector reserved on the side of the station crown beam 3. The connection structure of the retaining wall support beam 9, the retaining wall bottom plate 10 and the station crown beam 3 can be seen in Figure 3 .

[0055] The retaining wall top plate 11 of the present embodiment is made of C35 concrete with a thickness of 200 mm to 300 mm. The elevation of the retaining wall top plate 11 is the same as the elevation of the top of the slope 1. The retaining wall top plate 11 can be used as a pedestrian walkway or a driveway. A railing 13 is provided at the top edge of the retaining wall top plate 11. Specifically, the railing 13 is fixed to the retaining wall top plate 11 by anchor bolts. If the retaining wall top plate 11 is used as a driveway structure, a crash barrier structure should also be added.

[0056] The retaining wall backfill material 12 of this embodiment is made of well-graded sand, and the backfill elevation is determined according to the anti-slip and anti-overturning calculations of the retaining wall, and should not be less than the top elevation of the retaining wall beam 8.

[0057] The present invention also includes a construction method of a subway station box-type retaining wall structure, which is applied to the above-mentioned subway station box-type retaining wall structure and includes the following steps:

[0058] S1. Before the excavation of the subway station foundation pit, slope 1 is cut by slope reduction. If there is no slope reduction condition, temporary support is used to ensure the stability of slope 1.

[0059] S2. Construction of the station enclosure structure 4 is performed around the station structure 5: first, the station enclosure structure 4 is set, and then the station crown beam 3 is set, and the top of the station enclosure structure 4 is connected to the station crown beam 3, and a steel bar connector is reserved on the side of the station crown beam 3;

[0060] S3, performing foundation treatment at the position where the retaining wall bottom plate 10 is set in the soil of the slope 1, and using a strong tamping method or a replacement method to improve the foundation bearing capacity;

[0061] S4. After the foundation treatment is completed, the retaining wall structure is cast from bottom to top: first, the steel bars of the retaining wall bottom plate 10 are connected to the steel bar connectors of the station crown beam 3, and then the retaining wall bottom plate 10 is cast, and cast with the station crown beam 3 to form a first fixed support;

[0062] S5, complete the synchronous binding of the steel bars of the retaining wall side wall 6, the retaining wall waist beam 7, and the retaining wall cross beam 8 and pour concrete, and set a steel bar connector at the retaining wall waist beam 7. After the concrete strength reaches the design requirements, the retaining wall support beam 9 is constructed: connect the steel bar at one end of the retaining wall support beam 9 to the steel bar connector at the retaining wall waist beam 7, and connect the steel bar at the other end to the steel bar connector at the station crown beam 3, and cast the retaining wall support beam 9 and the station crown beam 3 to form a second fixed support;

[0063] S6, after the concrete strength of the retaining wall bottom plate 10, the retaining wall side wall 6, the retaining wall waist beam 7, the retaining wall cross beam 8 and the retaining wall support beam 9 reaches the design strength, the retaining wall backfill material 12 is placed in the retaining wall cavity, and the retaining wall top plate 11 is cast after the backfill height of the retaining wall backfill material 12 reaches the design elevation;

[0064] S7. After the above steps are completed, the station foundation pit is excavated. During the excavation process, the deformation and settlement of the station enclosure structure 4 and the retaining wall structure are monitored. After the station structure 5 is completed, the top plate is covered with soil to form the station top plate backfill soil 2, the retaining wall top plate 11 and the road structure on the top of the slope 1 are restored, and the railing 13 is installed.

[0065] Specifically, in step S3 , a 50 mm thick C20 plain concrete cushion layer is provided below the retaining wall bottom plate 10 .

[0066] Specifically, in step S6, the backfill height of the retaining wall backfill material 12 refers to the design elevation: determined according to the anti-slip and anti-overturning calculations of the retaining wall, with reference to the "Technical Code for Building Foundation Pit Support JGJ 120-2012", the anti-slip stability safety factor is greater than or equal to 1.2, and the anti-overturning safety factor is greater than or equal to 1.3.

[0067] The rigid connection structure of the station crown beam 3 and the station enclosure structure 4 adopted in this embodiment increases the overall rigidity and can form a fixed support structure. Then, the retaining wall bottom plate 10 is rigidly connected to the station crown beam 3, and the retaining wall waist beam 7 and the support beam force transmission component are set to strengthen the bottom constraint of the retaining wall structure. At the same time, the active earth pressure of the slope 1 soil corresponding to the retaining wall structure is transmitted to the station crown beam 3 through the retaining wall bottom plate 10, the retaining wall waist beam 7, and the retaining wall support beam 9, reducing the cantilever length of the retaining wall structure. The overall force transmission path is clear, and the retaining wall structure is provided with a retaining wall backfill 12 to increase the deadweight of the retaining wall structure, and improve the anti-slip and anti-overturning stability and safety of the retaining wall structure. The retaining wall structure can meet the force requirements of the pedestrian walkway or the roadway, and has good overall stability. The design of the entire construction method is reasonable, the construction method is simple and feasible, safe and reliable, and easy to construct.

[0068] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A box-type retaining wall structure for a subway station, characterized in that: Including slope, station roof backfill, station cap beam, station enclosure structure, station structure and retaining wall structure; The station roof backfill soil is arranged on one side of the slope, and the top of the slope is higher than the top of the station roof backfill soil; The station structure is arranged in the soil body of the station top plate backfill soil through the station enclosure structure, and the station cap beam is arranged on the top of the station enclosure structure; The retaining wall structure includes retaining wall side walls, retaining wall waist beams, retaining wall cross beams, retaining wall support beams, retaining wall bottom plates, retaining wall top plates and retaining wall backfill materials. The retaining wall side walls, retaining wall top plates and retaining wall bottom plates are arranged in the soil of the slope. The retaining wall side walls, retaining wall top plates and retaining wall bottom plates are connected to form a retaining wall cavity for placing the retaining wall backfill materials. The retaining wall waist beam is arranged on the retaining wall side walls. The retaining wall cross beam is arranged in the retaining wall cavity through the retaining wall waist beam. The two ends of the retaining wall support beam are respectively connected to the retaining wall waist beam and the station crown beam. One end of the retaining wall bottom plate extends out from the soil of the slope and is connected to the station crown beam.

2. The box-type retaining wall structure of a subway station according to claim 1, characterized in that: A pedestrian walkway or a vehicle road is arranged on the top of the slope.

3. The box-type retaining wall structure of a subway station according to claim 1, characterized in that: The station enclosure structure is a enclosure pile or a ground-connected wall, and the station enclosure structure is arranged around the four sides of the station structure.

4. The box-type retaining wall structure of a subway station according to claim 3, characterized in that: The cross-sectional shape of the station crown beam is the same as that of the station enclosure structure. The top of the station enclosure structure is located inside the station crown beam. The station crown beam is provided with a steel bar connector connected to one end of the retaining wall support beam and the retaining wall bottom plate.

5. The box-type retaining wall structure of a subway station according to claim 1, characterized in that: The top of the retaining wall waist beam is flush with the top of the station roof backfill soil; The width of the retaining wall waist beam is consistent with the width of the retaining wall side wall, and the retaining wall waist beam is embedded in the retaining wall side wall; Or the width of the retaining wall waist beam is greater than the width of the retaining wall side wall, and the retaining wall waist beam protrudes from the retaining wall side wall.

6. The box-type retaining wall structure of a subway station according to claim 5, characterized in that: The number of the retaining wall cross beams is more than two and they are evenly distributed along the length direction of the retaining wall side wall; The retaining wall support beams are evenly distributed along the length direction of the retaining wall side walls and correspond to the positions of the retaining wall cross beams.

7. The box-type retaining wall structure of a subway station according to claim 1, characterized in that: A railing is provided on the top edge of the retaining wall top plate.

8. A construction method for a box-type retaining wall structure of a subway station, characterized in that: The box-type retaining wall structure for a subway station as described in claims 1 to 7 above comprises the following steps: S1. Before excavating the foundation pit of a subway station, the slope is cut by slope reduction. If there is no slope reduction condition, temporary support is used to ensure the stability of the slope. S2. Construct the station enclosure structure around the station structure: first set up the station enclosure structure, then set up the station crown beam, and connect the top of the station enclosure structure with the station crown beam, and reserve a steel bar connector on the side of the station crown beam; S3. Perform foundation treatment at the location where the retaining wall bottom plate is set in the soil of the slope, and use strong tamping or replacement method to improve the bearing capacity of the foundation; S4. After the foundation treatment is completed, the retaining wall structure is cast from bottom to top: first, the steel bars of the retaining wall bottom plate are connected to the steel bar connectors of the station crown beam, and then the retaining wall bottom plate is cast, and cast with the station crown beam to form the first fixed support; S5. Complete the synchronous binding of the steel bars of the retaining wall side wall, the retaining wall waist beam, and the retaining wall cross beam and pour concrete, and set a steel bar connector at the retaining wall waist beam. After the concrete strength reaches the design requirements, carry out the construction of the retaining wall support beam: connect the steel bar at one end of the retaining wall support beam to the steel bar connector at the retaining wall waist beam, and connect the steel bar at the other end to the steel bar connector at the station crown beam, and cast the retaining wall support beam and the station crown beam to form a second fixed support; S6. After the concrete strength of the retaining wall bottom plate, retaining wall side wall, retaining wall waist beam, retaining wall cross beam and retaining wall support beam reaches the design strength, the retaining wall backfill is placed in the retaining wall cavity. After the backfill height of the retaining wall backfill reaches the design elevation, the retaining wall top plate is cast; S7. After the above steps are completed, the station foundation pit is excavated. During the excavation process, the deformation and settlement of the station enclosure structure and the retaining wall structure are monitored. After the station structure is completed, the top plate is covered with soil to form the station top plate backfill soil, the road structure of the retaining wall top plate and the top of the slope is restored, and the railings are installed.

9. The construction method of the box-type retaining wall structure of a subway station according to claim 8, characterized in that: In step S3, a 50 mm thick C20 plain concrete cushion layer is provided below the retaining wall bottom plate.

10. The construction method of the box-type retaining wall structure of a subway station according to claim 8, characterized in that: In step S6, the backfill height of the retaining wall backfill material refers to the design elevation: determined according to the anti-slip and anti-overturning calculations of the retaining wall, with reference to the "Technical Code for Building Foundation Pit Support JGJ 120-2012", the anti-slip stability safety factor is greater than or equal to 1.2, and the anti-overturning safety factor is greater than or equal to 1.3.

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