Guangyuan cementing material retaining wall support structure and construction method

Abstract

The application provides a wide-source cementing material retaining wall supporting structure and a construction method, which comprises a wide-source cementing material layer on a far slope surface of a slope body, an outer layer of the wide-source cementing material layer on the far slope surface is provided with a wide-source cementing material layer on a near slope surface, an outer surface of the wide-source cementing material layer on the near slope surface is provided with a concrete spraying surface protection, an inner part of the wide-source cementing material layer on the far slope surface is backfilled by backfilling soil behind the wall; a slope top isolation layer is arranged on the slope top, a slope top drainage ditch is arranged on the slope top position, and a slope bottom drainage ditch is arranged on the slope bottom position; the wide-source cementing material layer on the far slope surface and the wide-source cementing material layer on the near slope surface are internally penetrated by a drainage pipe which is communicated with the backfilling soil behind the wall. The application can meet the requirements of the stability and durability of the retaining wall supporting structure, reduce the investment and shorten the construction period under the principles of low-carbon environmental protection, green building and suitable material.

Description

Technical Field

[0001] This invention belongs to the field of geotechnical engineering, and in particular relates to a retaining wall support structure and construction method using Guangyuan cementitious material. Background Technology

[0002] Retaining walls are one of the most common main structures in civil engineering. Their primary loads are the self-weight of the soil and the lateral pressure generated by the loads on top of the soil. To ensure the economic rationality of the retaining structure and the stability and reliability of the supported soil, it is necessary to determine the appropriate retaining wall support method and materials based on the stress conditions of the retaining wall.

[0003] Guangyuan cementitious material is a binder made by mixing the original sand and soil material on the site with cementitious materials (cement) to form a binder that is easy to use. This material is guided by green building principles, making full use of natural materials to achieve minimal or zero waste. Guangyuan cementitious material can be regarded as an improved and reinforced sand and gravel material, with significantly improved mechanical parameters compared to the original material.

[0004] Adhering to the principles of green building, low-carbon environmental protection, and suitable materials, this new type of environmentally friendly material is applied to retaining wall support. Compared to conventional concrete retaining walls, it has a lower cost and, through layered filling, can be constructed simultaneously with the backfill soil. A retaining wall design is developed for this binder, while ensuring both construction and safety. In summary, this Guangyuan binder retaining wall support reduces the amount of work, lowers investment, and simultaneously accelerates the construction progress. Summary of the Invention

[0005] The main technical problem solved by this invention is to design a retaining wall support form and construction method based on the material characteristics of Guangyuan cementitious material, which can meet the requirements of stability and durability of retaining wall support, reduce investment and shorten construction period under the principles of low carbon and environmental protection, green building and suitable materials.

[0006] To achieve the above-mentioned technical features, the present invention aims to provide a Guangyuan cementitious retaining wall support structure, comprising a Guangyuan cementitious material layer on the far slope side located in the inner layer of the slope, and a Guangyuan cementitious material layer on the near slope side located on the outer layer of the far slope side layer. The outer surface of the Guangyuan cementitious material layer on the near slope side layer is protected by shotcrete. The interior of the slope of the Guangyuan cementitious material layer on the far slope side layer is backfilled with backfill soil behind the wall. A slope top seepage barrier layer is provided at the top of the slope, a slope top drainage ditch is provided at the top of the slope, and a slope bottom drainage ditch is provided at the bottom of the slope. Drainage pipes connecting the backfill soil behind the wall are passed through the interior of the Guangyuan cementitious material layer on the far slope side and the Guangyuan cementitious material layer on the near slope side.

[0007] The gel content of the Guangyuan cementitious material layer on the far slope is less than that on the near slope.

[0008] The height difference between the slope crest line and the existing ground level of the retaining wall is controlled between 3m and 6m.

[0009] The gel content of the Guangyuan cementitious material layer on the far slope is 3%~5%; the gel content of the Guangyuan cementitious material layer on the near slope is 10%~15%.

[0010] The shotcrete surface is made of C25 concrete with a thickness of 100-110mm and has an embedded steel mesh. The steel mesh is fixed to the Guangyuan cementitious material layer near the slope by soil nails.

[0011] The Guangyuan cementitious material layer on the far slope and the Guangyuan cementitious material layer on the near slope are filled and compacted in layers, and an early strength agent is added to improve the early strength of the retaining wall structure.

[0012] Both the top and bottom drainage ditches are laid along the retaining wall, and the length of the drainage ditches is determined by the length of the retaining wall.

[0013] The drainage pipe is made of PVC pipe and is buried during the construction of the retaining wall, with a distance of not less than 0.3m from the layered compaction surface;

[0014] The slope top seepage barrier layer is made of waterproof geotextile.

[0015] The backfill soil behind the wall is compacted using a flat roller method, with each layer of soil being 30cm to 35cm thick and compacted 6 to 8 times.

[0016] A construction method for a retaining wall support structure using Guangyuan cementitious material includes the following steps:

[0017] Step 1: First, clean the ground, excavate the bottom soil of the Guangyuan cementitious material layer on the near slope and the Guangyuan cementitious material layer on the far slope, and fill the wall base;

[0018] Step 2: Lay the Guangyuan cementitious material layer on the near slope and the Guangyuan cementitious material layer on the far slope in layers. Add an early strength agent to the Guangyuan cementitious material to ensure that the strength of the retaining wall can be improved in time during construction. Simultaneously lay the backfill soil behind the wall and compact each part to the specified density. After passing the test, lay the next layer.

[0019] Step 3: Drainage pipes are installed simultaneously during the laying of the Guangyuan cementitious material layer on the near slope, the Guangyuan cementitious material layer on the far slope, and the backfill soil behind the wall;

[0020] Step 4: After filling the slope in layers to the designed top elevation, construct the top slope waterproofing layer, which is made of waterproof geotextile.

[0021] Step 5: Construct drainage ditches at the top and bottom of the slope;

[0022] Step Six: Slope spraying with concrete for surface protection.

[0023] The present invention has the following beneficial effects:

[0024] 1. This invention uses a new type of Guangyuan cementitious material as retaining wall support, making full use of the original sand and soil material of the site, which conforms to the principles of energy conservation, environmental protection, green and low carbon and suitable materials.

[0025] 2. This invention can be constructed on existing ground and can be carried out simultaneously with the backfilling behind the wall. Compared with the traditional plain concrete retaining wall construction process, it effectively shortens the construction period.

[0026] 3. This invention utilizes unprocessed sand and soil material, mixed with a small amount of gel material, resulting in lower costs and significant economic benefits. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a typical support profile.

[0029] Figure 2 This is a schematic diagram of the layered filling construction.

[0030] In the diagram: 1. Slope top line; 2. Existing ground surface; 3. Shotcrete surface protection; 4. Guangyuan binder layer near the slope; 5. Guangyuan binder layer far from the slope; 6. Slope top drainage ditch; 7. Drainage pipe; 8. Slope top seepage barrier layer; 9. Backfill soil behind the wall; 10. First layer filling line; 11. Second layer filling line; 12. Detailed Implementation

[0031] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0032] Example 1:

[0033] See Figure 1-2 A retaining wall support structure using Guangyuan cementitious material is disclosed. It includes a distant slope Guangyuan cementitious material layer 5 located within the inner layer of the slope. A near slope Guangyuan cementitious material layer 4 is provided outside the distant slope Guangyuan cementitious material layer 5. The outer surface of the near slope Guangyuan cementitious material layer 4 is finished with shotcrete 3. The interior of the distant slope Guangyuan cementitious material layer 5 is backfilled with backfill soil 10. A slope top seepage barrier layer 9 is provided at the top of the slope, along with a slope top drainage ditch 6 and a slope bottom drainage ditch 7. Drainage pipes 8, connecting the backfill soil 10, penetrate the interior of both the distant slope Guangyuan cementitious material layer 5 and the near slope Guangyuan cementitious material layer 4. By employing this retaining wall support structure, in the application of the retaining wall, two different cementitious materials with varying amounts are used on the near and distant slope surfaces of the retaining wall. During construction, these cementitious materials and the backfill soil behind the retaining wall are simultaneously compacted in layers. This type of cementitious retaining wall support structure makes full use of the original sand and soil material on site while ensuring the stability and durability of the wall. It is low-carbon, environmentally friendly, green and energy-saving, and effectively shortens the construction period and reduces the cost.

[0034] Furthermore, the gel content of the Guangyuan cementitious material layer 5 on the far slope is less than that of the Guangyuan cementitious material layer 4 on the near slope. By using different gel contents, the structural strength and stability of the subsequently constructed retaining wall are effectively guaranteed. Moreover, the use of the new Guangyuan cementitious material as the retaining wall support makes full use of the original sand and soil material of the site, which conforms to the principles of energy conservation, environmental protection, green and low carbon, and suitable materials for construction.

[0035] Furthermore, the height difference between the retaining wall and the existing ground level 2 at the top of the slope 1 is controlled between 3m and 6m. This retaining wall height allows for flexible arrangement as needed, enhancing its adaptability.

[0036] Furthermore, the gel content of the Guangyuan cementitious material layer 5 on the far slope is 3%~5%; the gel content of the Guangyuan cementitious material layer 4 on the near slope is 10%~15%. By using different gel contents, the stability of the retaining wall structure is ensured while effectively reducing the engineering cost.

[0037] Furthermore, the shotcrete facing 3 uses C25 concrete with a thickness of 100-110mm and incorporates a reinforcing mesh. The reinforcing mesh is fixed to the near-slope binder layer 4 using soil nails. Preferably, the reinforcing mesh is 200×200 mm.

[0038] Furthermore, the Guangyuan binder layer 5 on the far slope and the Guangyuan binder layer 4 on the near slope are filled and compacted in layers, and an early-strength agent is added to improve the early strength of the retaining wall structure. The aforementioned early-strength agent enables rapid curing of the Guangyuan binder layer 5 on the far slope and the Guangyuan binder layer 4 on the near slope in the early stages of filling, thereby ensuring timely improvement of the retaining wall strength.

[0039] Furthermore, both the slope-top drainage ditch 6 and the slope-bottom drainage ditch 7 are laid along the retaining wall, and the length of the drainage ditch is determined according to the construction length of the retaining wall. The above-mentioned drainage ditches can achieve a good drainage effect.

[0040] Furthermore, the drainage pipe 8 is made of PVC pipe and is buried during the construction of the retaining wall, with a distance of not less than 0.3m from the layered compaction surface. The drainage pipe 8 serves to drain water from the interior of the retaining wall, thereby ensuring the stability of the slope.

[0041] Furthermore, the slope top seepage barrier layer 9 is made of waterproof geotextile. The use of waterproof geotextile provides excellent seepage prevention.

[0042] Furthermore, the backfill soil 10 behind the wall is compacted using a flat roller method, with each layer of soil being 30cm to 35cm thick and compacted 6 to 8 times per layer. Through the above-mentioned backfilling, compaction, and tamping, the structural strength and stability of the backfill soil 10 behind the wall are ensured, thereby ultimately guaranteeing the reliability of the retaining wall.

[0043] Example 2:

[0044] A construction method for a retaining wall support structure using Guangyuan cementitious material includes the following steps:

[0045] Step 1: First, clean the ground 2, excavate the bottom soil of the Guangyuan cementitious material layer 4 on the near slope and the Guangyuan cementitious material layer 5 on the far slope, and fill the wall base;

[0046] Step 2: Lay the Guangyuan cementitious material layer 4 on the near slope and the Guangyuan cementitious material layer 5 on the far slope in layers. Add an early strength agent to the Guangyuan cementitious material to ensure that the strength of the retaining wall can be improved in time during construction. Simultaneously lay the backfill soil 10 behind the wall and compact each part to the specified density. After passing the test, lay the next layer.

[0047] Step 3: During the laying of the Guangyuan cementitious material layer 4 on the near slope, the Guangyuan cementitious material layer 5 on the far slope, and the backfill soil 10 behind the wall, the drainage pipe 8 is buried simultaneously.

[0048] Step 4: After filling the slope to the designed top elevation in layers, construct the top slope waterproofing layer 9, which is made of waterproof geotextile.

[0049] Step 5: Construct drainage ditch 6 at the top of the slope and drainage ditch 7 at the bottom of the slope;

[0050] Step 6: Slope spraying concrete protection 3.

Claims

1. A retaining wall support structure using a widely sourced cementitious binder, characterized in that, It includes a far-slope surface cementitious material layer (5) located in the inner layer of the slope, and a near-slope surface cementitious material layer (4) is provided on the outer layer of the far-slope surface cementitious material layer (5). The outer surface of the near-slope surface cementitious material layer (4) is protected by shotcrete (3). The interior of the slope of the far-slope surface cementitious material layer (5) is backfilled by backfill soil (10) behind the wall. A slope top seepage barrier layer (9) is provided at the top of the slope, a slope top drainage ditch (6) is provided at the top of the slope, and a slope bottom drainage ditch (7) is provided at the bottom of the slope. Drainage pipes (8) that connect the backfill soil (10) behind the wall are passed through the interior of the far-slope surface cementitious material layer (5) and the near-slope surface cementitious material layer (4). The gel content of the Guangyuan cementitious material layer (5) on the far slope is less than that of the Guangyuan cementitious material layer (4) on the near slope. The gel content of the Guangyuan cementitious material layer (5) on the far slope is 3%~5%; the gel content of the Guangyuan cementitious material layer (4) on the near slope is 10%~15%. The Guangyuan cementitious material layer (5) on the far slope and the Guangyuan cementitious material layer (4) on the near slope are filled and compacted in layers, and an early strength agent is added to improve the early strength of the retaining wall structure.

2. The Guangyuan cementitious retaining wall support structure according to claim 1, characterized in that: The height difference between the slope top line (1) and the existing ground (2) of the retaining wall is controlled at 3m~6m.

3. The Guangyuan cementitious retaining wall support structure according to claim 1, characterized in that: The shotcrete surface (3) is made of C25 concrete with a thickness of 100~110mm and has a built-in steel mesh. The steel mesh is fixed to the Guangyuan cementitious material layer (4) near the slope by soil nails.

4. The retaining wall support structure of Guangyuan cementitious material according to claim 1, characterized in that: The drainage ditch (6) at the top of the slope and the drainage ditch (7) at the bottom of the slope are both laid along the retaining wall, and the length of the drainage ditch is determined according to the construction length of the retaining wall.

5. The retaining wall support structure of Guangyuan cementitious material according to claim 1, characterized in that: The drainage pipe (8) is made of PVC pipe and is buried during the filling of the retaining wall. The distance between the location and the layered compaction surface is not less than 0.3m. The top slope seepage barrier layer (9) is made of waterproof geotextile.

6. The retaining wall support structure of Guangyuan cementitious material according to claim 1, characterized in that: The backfill soil (10) behind the wall is compacted by flat roller method, with each layer of soil being 30cm~35cm thick and compacted 6~8 times.

7. A construction method for a Guangyuan cementitious retaining wall support structure according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: First, clean the ground, excavate the bottom soil of the Guangyuan cementitious material layer (4) on the near slope and the Guangyuan cementitious material layer (5) on the far slope, and fill the wall base; Step 2: Lay the Guangyuan cementitious material layer (4) on the near slope and the Guangyuan cementitious material layer (5) on the far slope in layers. Add an early strength agent to the Guangyuan cementitious material to ensure that the strength of the retaining wall can be improved in time during the construction process. Simultaneously lay the backfill soil (10) behind the wall and compact each part to the specified density. After the test is qualified, lay the next layer. Step 3: Drainage pipes (8) are simultaneously installed during the laying of the Guangyuan cementitious material layer (4) on the near slope, the Guangyuan cementitious material layer (5) on the far slope, and the backfill soil (10) behind the wall. Step 4: After filling the slope to the designed top elevation in layers, construct the top slope waterproofing layer (9), which is made of waterproof geotextile. Step 5: Construct drainage ditches (6) at the top of the slope and (7) at the bottom of the slope. Step 6: Slope spraying concrete protection (3).

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