Method for recovering toughness of embankment landslide after rainfall

Abstract

The invention relates to a toughness recovery method for embankment landslide after rainfall, which comprises two parts of temporary emergency measures and comprehensive repair engineering, and the comprehensive repair engineering is carried out after the temporary emergency measures are completed. In the temporary emergency measures, a first row of gabion retaining walls are arranged at the position adjacent to the embankment landslide after rainfall, gabions are arranged in a layered step mode, and permeable materials are filled in the gabions, so that it is ensured that water can be effectively drained when rainfall happens again, and secondary landslide is avoided. In the comprehensive repair project, the second row of gabion retaining walls are arranged at the position far away from the first row of gabion retaining walls, and the two rows of gabions are connected into a whole through the embankment materials and the connecting pieces. By means of the multi-layer layout of the gabion retaining wall and the drainage channel formed by the water-permeable materials, the drainage performance and the overall stability of the embankment are remarkably improved, the construction time is shortened, and the construction cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of engineering geology. Background Art

[0002] In recent years, due to the impact of global climate change, the frequency of heavy rainfall events has increased significantly, leading to frequent landslide disasters. Among them, embankment landslide disasters are particularly prominent, such as the collapse of the Mei-Da Expressway in Guangdong, which caused great casualties and property losses.

[0003] Take highways as an example. The roads are supported by embankments with slopes on both sides. Heavy rainfall can easily trigger side slope landslides, leading to traffic paralysis, affecting post-disaster emergency rescue, and reducing urban and rural resilience. Therefore, it is of great significance to establish an effective resilience recovery method for embankment landslides after rainfall to accelerate the recovery of the road system.

[0004] Among the existing methods, a post-rainfall embankment landslide emergency recovery plan is usually adopted that combines temporary emergency response and comprehensive repair. In terms of temporary emergency response, sandbags are often piled up along the slope after the landslide for quick support, so as to restore some functions of the road in a short time. Subsequently, gabions or concrete retaining walls are used for comprehensive repair.

[0005] However, as time goes by, sandbags are prone to deformation and loss, and their supporting effect on the road gradually weakens. Before comprehensive repair, the aging sandbags need to be removed and replaced with other protective structures such as gabion retaining walls, which increases the complexity and cost of construction. In addition, the water permeability of sandbags is poor. If it rains again between temporary emergency response and comprehensive repair, the embankment after the collapse will easily absorb water and soften, causing a secondary collapse.

[0006] Therefore, it is necessary to develop a resilient recovery method for embankment landslides after rainfall, which can achieve efficient and stable support between temporary emergency response and comprehensive repair, shorten the construction period and reduce construction costs. Summary of the invention

[0007] The purpose of the present invention is to provide a method for toughness recovery of embankment landslide after rainfall, so as to solve the problems of long repair time, high construction cost and poor drainage performance in the existing recovery methods.

[0008] To achieve the above object, the present invention adopts the following technical solutions: A method for resilient restoration of embankment landslide after rainfall comprises two parts: temporary emergency measures and comprehensive repair works. The comprehensive repair works are carried out after the temporary emergency measures are completed.

[0009] Furthermore, the temporary emergency measures mentioned above can quickly restore the initial stability of the embankment and prevent the landslide from further expanding. The specific steps are as follows: S1.1 Remove the collapsed soil in the embankment landslide area and clean up the accumulation at the drainage channel to ensure smooth subsequent drainage; S1.2 The exposed embankment landslide slope, i.e., the collapsed slope surface, is trimmed to form a new flat slope, i.e., the trimmed new slope surface; S1.3 Arrange rectangular gabions in layers and steps from bottom to top along the trimmed new slope surface to form the first row of gabion retaining walls for emergency treatment; S1.4 There is a gap between the trimmed new slope surface and the gabions of the first row of gabion retaining wall. The gap is backfilled with single-grained crushed stone and its density is increased by compaction.

[0010] Furthermore, the first layer of gabions of the first row of gabion retaining walls was installed near the bottom of the new slope after trimming.

[0011] Furthermore, each rectangular gabion is filled with hard stone, crushed stone or recycled concrete aggregate material to provide necessary support and drainage functions.

[0012] Furthermore, in order to prevent the soil and sand of the slope after trimming from entering the single-grained gravel layer backfilled, geotextiles can be laid on the new slope after trimming.

[0013] Furthermore, the comprehensive repair project mentioned above, rebuilding the collapsed embankment to restore the function of the road system, has the following specific steps: S2.1 Place the first layer of gabions of the second row of gabion retaining walls on the ground far away from the first row of gabion retaining walls (i.e. the original embankment slope foot position); S2.2 Fill the embankment filler between the first layer of gabions in the first row of gabion retaining walls and the first layer of gabions in the second row of gabion retaining walls, compact the surface by leveling, and fix the first layers of gabions in the two rows of gabion retaining walls together through connectors; thereby, the first layer of gabions in the first row of gabion retaining walls and the first layer of gabions in the second row of gabion retaining walls are integrated through the embankment filler and the connectors; S2.3 After the first layer of gabions is filled, the second layer of gabions of the second row of gabions is placed on the first layer of gabions of the second row of gabions and the embankment fill; S2.4 Fill the roadbed filler between the second layer of gabions in the first row of gabion retaining walls and the second layer of gabions in the second row of gabion retaining walls, and compact the surface by leveling, and fix the second layers of gabions in the two rows of gabion retaining walls together through connectors; thereby, the second layer of gabions in the first row of gabion retaining walls and the second layer of gabions in the second row of gabion retaining walls are integrated through the roadbed filler and connectors; S2.5 Place another layer of gabions and fill them with the same process as in S2.3 and S2.4 above, and repeat this process multiple times until the stacking and filling of two rows of gabion retaining wall structures are completed; S2.6 The top surface of the embankment shall be appropriately widened and the slope shall be adjusted to meet the design requirements of the embankment.

[0014] Preferably, the heights of the gabions of the first row of gabion retaining walls and the second row of gabion retaining walls are consistent.

[0015] Furthermore, in step S2.2, the filling process of the embankment fill is carried out in stages: first, the embankment material is filled to no more than 1 / 2 of the height of the first layer of gabions, the surface is leveled and compacted; then, the first layer of gabions of the two rows of gabion retaining walls are fixedly connected by connecting pieces; then, the filling is continued until the filling height of the embankment fill reaches the top of the first layer of gabions.

[0016] In summary, the beneficial effects of the present invention are: through the synergy of temporary emergency measures and comprehensive repair projects, rapid, economical and effective recovery of embankment landslides can be achieved. The gabion retaining wall set in the temporary emergency measures can not only quickly restore the initial stability of the embankment, but its good permeability can also effectively drain rainwater, prevent water pressure accumulation from causing secondary landslides, and reduce the risk of further expansion of landslides. The gabion retaining wall can be directly applied to comprehensive repair projects after emergency treatment, shortening the recovery time and saving construction costs. Compared with traditional methods, the present invention utilizes the multi-level layout of the gabion retaining wall and the drainage channel formed by the permeable material, which significantly improves the drainage performance and the overall stability of the embankment, and reduces the construction time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Embankment cross section.

[0018] Figure 2 Cross-section of the embankment after heavy rainfall induced landslide.

[0019] Figure 3 Cross-section of the embankment after the landslide slope was repaired.

[0020] Figure 4 Cross-section of the embankment after completion of temporary emergency measures.

[0021] Figure 5 A cross section of the embankment at the start of the restoration work (installation of the second row of gabion retaining walls).

[0022] Figure 6 Cross-section of the embankment during the restoration project (connecting the first and second rows of gabion retaining walls).

[0023] Figure 7 Cross-section of the embankment after the restoration work is completed.

[0024] Figure 8 New embankment section.

[0025] Marking instructions: 1 - road surface; 2 - slope; 21 - top of slope; 22 - slope surface; 3 - drainage ditch; 4 - landslide slope; 41 - landslide slope surface; 42 - collapsed soil of embankment; 5 - new slope after repair; 51 - new slope surface after repair; 6 - geotextile; 7 - first row of gabion retaining wall; 8 - single-grain crushed stone; 9 - second row of gabion retaining wall; 10 - embankment filling; 11 - connector. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is described in detail below with reference to specific examples. Parts not described, such as the removal details of the collapsed soil, the type and number of gabions, etc., need to be designed in combination with actual conditions. Under the guidance of the present invention, those skilled in the art can carry out construction through experiments and calculations according to existing conditions without affecting the implementation of the invention.

[0027] like Figure 1 As shown, the embankment structure consists of a road surface 1, a slope 2 and a drainage channel 3. The road surface 1 is located at the top of the slope 2, and its bottom is connected to the top surface 21 of the slope 2, and the slope surface 22 of the slope 2 is the side of the embankment.

[0028] Under the action of heavy rainfall, the embankment was damaged and landslides occurred (such as Figure 2 As shown in the figure). Heavy rainfall causes the slope 2 supporting the road surface 1 to loosen and slide, and the road surface 1 also collapses, forming a slope after the slide, namely, the slide slope 4, whose slope surface is the slide slope surface 41. The slide slope surface 41 in the figure is in an arc shape. The collapsed soil 42 of the embankment after the slide is accumulated on the ground on one side of the embankment. At this time, the slide slope 4 is in an unstable state. If it encounters rainfall again, the slide will be further aggravated. Therefore, in order to prevent the further collapse of the slide slope 4, temporary emergency treatment should be implemented as soon as possible, and subsequent comprehensive restoration of the embankment should be carried out.

[0029] The method for recovering the toughness of embankment landslide after rainfall proposed by the present invention comprises two parts: temporary emergency measures and comprehensive repair works. The comprehensive repair works are carried out after the temporary emergency measures are completed.

[0030] The temporary emergency measures include the following steps: S1.1 First, use excavators and other equipment to remove the collapsed soil 42 in the embankment landslide area, and clean up the accumulation in the drainage channel 3 and other locations to ensure smooth subsequent drainage.

[0031] S1.2 Subsequently, the exposed embankment landslide slope, i.e., the collapsed slope surface 41, is trimmed to form a new flat slope, i.e., the trimmed new slope 5, whose slope surface is the trimmed new slope surface 51, as shown in FIG. Figure 3 shown.

[0032] S1.3 Then, a geotextile 6 is laid on the trimmed new slope surface 51. The geotextile 6 allows water to pass through but blocks soil and sand, and has a significant drainage effect.

[0033] S1.4 Finally, along the newly trimmed slope 51 after laying the geotextile 6, rectangular gabions are arranged in layers and steps from bottom to top to form the first row of gabion retaining walls 7 for emergency disposal, such as Figure 4 shown.

[0034] In this embodiment, the first row of gabion retaining walls 7 are stacked in eight layers in a stepped manner. Each gabion is made of wire mesh and filled with hard stones, gravel or recycled concrete aggregates, etc., and has good support and excellent drainage functions. Therefore, even if it rains again, water can be quickly discharged, reducing the risk of secondary landslides. The installation method of each gabion can be to assemble the wire mesh and fill the material on site; or it can be assembled at other locations first, and then lifted and installed using equipment such as cranes to ensure the stability of the gabion and the integrity of the structure.

[0035] The filler in the gabion needs to be stacked relatively loosely to ensure the water permeability of the gabion, so that water can be discharged smoothly, avoiding the accumulation of water pressure in the gabion retaining wall and reducing the risk of secondary landslide.

[0036] Specifically, the first layer of gabions of the first row of gabion retaining walls 7 is installed near the bottom of the trimmed new slope 5. Since the gabions are rectangular, there is a gap between the trimmed new slope surface 51 and the first layer of gabions of the first row of gabion retaining walls 7. The gap is backfilled with single-grain crushed stone 8 with good water permeability to the same height as the first layer of gabions, and its density is increased by tamping. If necessary, geotextiles can be laid on the single-grain crushed stone to enhance stability and prevent the displacement of crushed stone particles. Then the second layer of gabions is stacked in steps and filled with single-grain crushed stone 8, and this step is repeated to eventually form an eight-layer stepped first row of gabion retaining wall 7, as shown in FIG. Figure 4 As shown, complete the temporary emergency measures.

[0037] After the temporary emergency measures are completed, the new slope 5 is supported by the first row of gabion retaining walls 7 to ensure its stability and drainage performance. Even if it rains again, it will not collapse. The collapsed embankment will be fully repaired later, including filling and repairing the embankment, adjusting the slope and widening the road surface, and finally restoring the normal traffic function of the road system. The comprehensive repair project is usually carried out within weeks to months after the completion of the temporary emergency measures.

[0038] The comprehensive repair process includes the following steps: S2.1 If Figure 5 As shown, the first layer of gabions of the second row of gabion retaining walls 9 is placed on the ground far away from the first row of gabion retaining walls 7 (i.e., the original embankment slope foot position).

[0039] The gabions of the second row of gabion retaining walls 9 can be the same as those of the first row of gabion retaining walls 7 (in terms of size, material, type of filling material, etc.), or different types of gabions can be used. Figure 5 In the embodiment, the height of the first layer of gabions of the first row of gabion retaining walls 7 and the second row of gabion retaining walls 9 is the same.

[0040] The installation method of the gabions of the second row of gabion retaining walls 9 can be the same as that of the first row, that is, assembling the wire mesh on site and filling the materials; or it can be assembled in other locations first, and then lifted and installed using equipment such as cranes to ensure the stability of the gabions and the integrity of the structure.

[0041] S2.2 If Figure 6 As shown, the embankment filler 10 is filled between the first layer of gabions in the first row of gabion retaining walls 7 and the first layer of gabions in the second row of gabion retaining walls 9. The specific process includes: S2.2.1 First, fill the embankment filler 10 to about half the height of the first layer of gabions. The roadbed filler used should have good water permeability, such as gravel, quartzite, crushed stone or crushed concrete, which are conducive to drainage and provide long-term support to maintain the stability of the embankment. In this embodiment, crushed stone is selected as the roadbed filler 10 to ensure that rainwater can be quickly discharged when encountering heavy rainfall, thereby preventing further landslide of the embankment.

[0042] S2.2.2 Next, use the connector 11 to connect the first layer of gabions in the first row of gabion retaining walls 7 to the first layer of gabions in the second row of gabion retaining walls 9 (e.g. Figure 6 As shown). The material of the connector 11 should be a material with high tensile strength, such as iron wire or metal wire mesh with anti-corrosion treatment on the surface. In addition, a combination of steel, synthetic resin and other materials can also be selected to ensure the firmness and durability of the structure. In this embodiment, iron wire is used as the connector 11, so that a stable connection can be achieved with less material, and the connection operation is simple, which can effectively reduce labor and cost.

[0043] S2.2.3 Then, continue to fill the embankment filler 10 between the first layer of gabions in the first row of gabion retaining walls 7 and the first layer of gabions in the second row of gabion retaining walls 9. At this time, the embankment filler 10 is placed on the connecting piece 11 and is filled by leveling the surface and compacting. Thus, the first layer of gabions in the first row of gabion retaining walls 7 and the second row of gabion retaining walls 9 are formed as a whole by the embankment filler 10 and the connecting piece 11, and the first layer of gabions in the second row of gabion retaining walls 9 slides or shifts due to the lateral pressure.

[0044] S2.3 Place the second layer of gabions of the second row of gabion retaining wall 9 on the first layer of gabions of the second row of gabion retaining wall 9 and the embankment fill 10, ensuring that its installation position has a predetermined normal slope relative to the first layer of gabions of the second row of gabion retaining wall 9.

[0045] S2.4 Use the embankment filler 10 to fill the gap between the second layer of gabions of the first row of gabion retaining walls 7 and the second layer of gabions of the second row of gabion retaining walls 9, and use the connector 11 to connect the second layers of gabions of the two rows of gabion retaining walls 7, and continue to fill the embankment filler 10, and fill by leveling the surface and compacting. Thus, the second layer of gabions of the first row of gabion retaining walls 7 and the second layer of gabions of the second row of gabion retaining walls 9 are integrated by the embankment filler 10 and the connector 11.

[0046] S2.5 Refer to the above S2.3 and S2.4 processes and repeat them several times. The resulting structure will be as follows: Figure 7 As shown, the gabions of the second row of gabion retaining walls 9 are stacked up to eight layers, and the embankment fillers 10 and connectors 11 are filled between the first row of gabion retaining walls 7 and the second row of gabion retaining walls 9.

[0047] S2.6 After the repair work is completed, the embankment will be widened and the slope will be adjusted, and the road surface 1 will be installed on the first row of gabion retaining walls 7, the second row of gabion retaining walls 9 and the embankment filling 10. Figure 8 As shown, the road system function is restored.

[0048] The above description is only a description of the preferred embodiments of the present application, and is not intended to limit the scope of the present application. Any changes or modifications made by any person skilled in the art based on the above disclosed technical contents shall be deemed as equivalent effective embodiments and shall fall within the scope of protection of the technical solution of the present application.

Claims

1. A method for recovering the toughness of embankment landslide after rainfall, characterized in that: It includes two parts: temporary emergency measures and comprehensive repair projects. The comprehensive repair project is carried out after the temporary emergency measures are completed.

2. The method for recovering toughness of embankment landslide after rainfall according to claim 1, characterized in that: The temporary emergency measures mentioned above can quickly restore the initial stability of the embankment and prevent the landslide from further expanding. The specific steps are as follows: S1.1 Remove the collapsed soil (42) in the embankment landslide area and clean up the deposits at the drainage channel (3) to ensure smooth subsequent drainage; S1.2 trimming the exposed embankment landslide slope surface, i.e., the landslide slope surface (41), so as to form a new flat slope surface, i.e., the trimmed new slope surface (5), whose slope surface is the trimmed new slope surface (51); S1.3 Arrange rectangular gabions in a stepped manner from bottom to top along the trimmed new slope surface (51) to form the first row of gabion retaining walls (7) for emergency treatment; S1.4 There is a gap between the trimmed new slope surface (51) and the gabions of the first row of gabion retaining walls (7). The gap is backfilled with single-grained crushed stone (8) and its density is increased by compaction.

3. A method for recovering toughness of embankment landslide after rainfall as claimed in claim 2, characterized in that: The first layer of gabions of the first row of gabion retaining walls (7) is installed near the bottom of the trimmed new slope (5).

4. The method for recovering toughness of embankment landslide after rainfall according to claim 2, characterized in that: Each rectangular gabion is filled with hard stone, crushed stone or recycled concrete aggregate material to provide the necessary support and drainage functions.

5. The method for recovering toughness of embankment landslide after rainfall according to claim 2, characterized in that: In order to prevent the soil and sand of the slope after trimming from entering the single-grained gravel layer to be backfilled, a geotextile (6) is laid on the new slope after trimming.

6. The method for recovering toughness of embankment landslide after rainfall according to claim 1, characterized in that: The comprehensive repair project mentioned above will rebuild the collapsed embankment to restore the function of the road system. The specific steps are as follows: S2.1 Place the first layer of gabions of the second row of gabion retaining walls (9) on the ground far from the first row of gabion retaining walls (7), i.e., at the original embankment slope foot; S2.2 Filling the embankment filler (10) between the first layer of gabions of the first row of gabion retaining walls (7) and the first layer of gabions of the second row of gabion retaining walls (9), compacting the surface by leveling, and fixing the first layers of gabions of the two rows of gabion retaining walls with the connecting piece (11); thereby, the first layer of gabions of the first row of gabion retaining walls (7) and the first layer of gabions of the second row of gabion retaining walls (9) form a whole through the embankment filler and the connecting piece; S2.3 After the first layer of gabions is filled, the second layer of gabions of the second row of gabions is placed on the first layer of gabions of the second row of gabions (9) and the embankment fill (10); S2.4 Filling the roadbed filler (10) between the second layer of gabions of the first row of gabion retaining walls (7) and the second layer of gabions of the second row of gabion retaining walls (9), compacting the surface by leveling, and fixing the second layers of gabions of the two rows of gabion retaining walls with the connecting piece (11); thereby, the second layer of gabions of the first row of gabion retaining walls (7) and the second layer of gabions of the second row of gabion retaining walls (9) form a whole through the roadbed filler and the connecting piece; S2.5 Place another layer of gabions and fill them with the same process as in S2.3 and S2.4 above, and repeat this process multiple times until the stacking and filling of two rows of gabion retaining wall structures are completed; S2.6 The top surface of the embankment shall be appropriately widened and the slope shall be adjusted to meet the design requirements of the embankment.

7. A method for recovering toughness of embankment landslide after rainfall as claimed in claim 6, characterized in that: The heights of the gabions of the first row of gabion retaining walls (7) and the second row of gabion retaining walls (9) are the same.

8. The method for recovering toughness of embankment landslide after rainfall according to claim 6, characterized in that: In step S2.2, the filling process of the embankment fill is carried out in stages: first, the embankment material (10) is filled to no more than 1 / 2 of the height of the first layer of gabions, the surface is leveled and compacted; then, the first layer of gabions of the two rows of gabion retaining walls are fixedly connected by connecting pieces (11); then, the filling is continued until the filling height of the embankment fill (10) reaches the top of the first layer of gabions.

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