A collapse slope excavation support structure

Abstract

This utility model provides a slope excavation and support structure for landslide slopes, relating to the fields of slope support and channel lining technology. The unstable slope in the landslide area is cut to form the excavated slope; the top of the excavated slope has a slope top platform; the upper part of the landslide area has a roadbed retaining wall, which is reinforced with anchor cables; the excavated slope is backfilled and counter-pressed to form a temporary stable slope. This utility model's slope excavation and support structure for landslide slopes is convenient to construct and has good safety, reliability, and economy. It is particularly significant in the large-scale landslide, reinforcement, and treatment of existing or under-construction channel slopes.

Description

Technical Field

[0001] This utility model belongs to the field of slope excavation and support technology in water conservancy projects, and specifically relates to a slope collapse excavation and support structure. Background Technology

[0002] As the most widely used water conservancy project in traditional urban water diversion and farmland irrigation, canals employ various slope protection methods, including riprap, dry-laid rubble masonry, mortar-grouted rubble masonry, and reinforced concrete panels. Their main functions are to resist water erosion, stabilize slopes, and prevent soil and water loss. Canal slopes require high durability in practical applications and must adapt to local deformations of the slope and embankment. They are prone to localized damage or structural instability when encountering poor soil conditions, heavy rainfall, subsidence, expansive soil, embankment collapse, ice heave, or seepage pressure. Once damaged, they are difficult to repair, leading to increasingly severe slope damage. Localized damage to the slope can easily result in large-scale and extensive damage, with high repair costs and inconvenient construction. Utility Model Content

[0003] In view of the shortcomings of the existing technology, this utility model provides a slope excavation and support structure that can effectively solve the above problems and improve the stability and protection effect of the slope.

[0004] The technical solution adopted in this utility model is as follows:

[0005] This utility model provides a slope excavation support structure, including a roadbed retaining wall (1), a slope top platform (4), an excavated slope (8), a backfill counterweight body (11), a temporary stabilizing slope (12), and anchor cables (17).

[0006] The unstable slope in the landslide area is cut to form the excavated slope (8); the top of the excavated slope (8) has the top platform (4); the upper part of the landslide area has the roadbed retaining wall (1), the roadbed retaining wall (1) is reinforced by the anchor cable (17); the backfill is backfilled to the outside of the excavated slope (8) to form the backfill counterweight body (11), forming the temporary stable slope (12).

[0007] Furthermore, the bottom of the excavated slope (8) extends to the position where the soil-rock boundary line (2) intersects with the rock slope surface (9).

[0008] Furthermore, the slope opening line of the excavated slope (8) and the slope toe of the roadbed retaining wall (1) are kept at a horizontal distance of 2-10m.

[0009] Furthermore, the backfill material of the backfill counterweight body (11) is soil and stone slag filling material.

[0010] Furthermore, the anchor cable (17) is inserted into the rock for 15m.

[0011] Furthermore, the slope of the temporary stable slope (12) is 1:1.73.

[0012] Furthermore, when the temporary stable slope (12) is excavated and supported in stages to the design elevation (13) of the channel bottom, anchor plate concrete (15) is poured on the slope surface after excavation.

[0013] Furthermore, the anchor plate concrete (15) is reinforced with spaced system anchor rods (16); the system anchor rods (16) are welded to the surface steel mesh of the anchor plate concrete (15).

[0014] Furthermore, drainage pipes (18) are arranged at intervals within the concrete anchor plate (15); the drainage pipes (18) are arranged in a staggered pattern with an elevation angle of 10°.

[0015] Furthermore, structural joints are provided at intervals in the concrete of the anchor plate (15), and the joints are filled with closed-cell foam board.

[0016] The slope excavation and support structure provided by this utility model has the following advantages:

[0017] The excavation and support structure for collapsed slopes of this utility model is convenient to construct and has good safety, reliability and economy. It has outstanding practical significance, especially in the process of large-scale collapse, reinforcement and treatment of existing or under-construction channel slopes. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the slope cutting process in the landslide area provided by this utility model;

[0020] Figure 2 This is a schematic diagram of the backfilling and counter-pressure process provided by this utility model;

[0021] Figure 3 A schematic diagram of the slope excavation support structure provided by this utility model;

[0022] Figure 4 A flowchart of the slope excavation and support method provided by this utility model.

[0023] Among them: 1-Roadbed retaining wall; 2-Soil-rock boundary line; 3-Weakly weathered lower line; 4-Slope top platform; 5-Original ground line; 6-Slope cutting area; 7-Original excavation line; 8-Excavated slope; 9-Rock slope; 10-Slide indication line; 11-Backfill counterweight; 12-Temporary stabilized slope; 13-Design elevation; 14-Groundwater level; 15-Anchor plate concrete; 16-System anchor bolt; 17-Anchor cable; 18-Drainage pipe. Detailed Implementation

[0024] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0025] This utility model provides an excavation support structure that can adapt to the stable repair of channel slope collapse, enabling safe construction, slope stabilization, and permanent lining.

[0026] See Figures 1-3 This utility model embodiment provides a collapse slope excavation support structure, including a roadbed retaining wall 1, a slope top platform 4, an excavated slope 8, a backfill counterweight body 11, a temporary stabilizing slope 12, and anchor cables 17.

[0027] The unstable slope in the landslide area is cut to form the excavated slope 8; the bottom of the excavated slope 8 extends to the position where the soil-rock boundary line 2 intersects with the rock slope surface 9; the slope opening line of the excavated slope 8 and the slope toe of the roadbed retaining wall 1 are kept at a horizontal distance of 2-10m.

[0028] The excavated slope 8 has a slope top platform 4 at its top; the upper part of the landslide section has a roadbed retaining wall 1, which is reinforced by anchor cables 17, for example, the anchor cables 17 are inserted into the rock 15m deep; the excavated slope 8 is backfilled with a backfill counterweight body 11, the backfill material of which is soil and stone fill material, thereby forming the temporary stable slope 12, for example, the slope of the temporary stable slope 12 is 1:1.73.

[0029] The temporary stabilized slope 12 is a temporary support structure. When the temporary stabilized slope 12 is excavated and supported in stages to the design elevation 13 of the channel bottom, anchor plate concrete 15 is poured on the slope surface after excavation. The anchor plate concrete 15 is reinforced with spaced-apart system anchors 16; the system anchors 16 are welded to the surface steel mesh of the anchor plate concrete 15. Drainage pipes 18 are arranged at intervals within the anchor plate concrete 15; the drainage pipes 18 have an elevation angle of 10° and are arranged in a staggered pattern. Structural joints are provided at intervals in the anchor plate concrete 15, and the joints are filled with closed-cell foam board.

[0030] The following is an example:

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown in the figure, this utility model embodiment provides a slope excavation support structure. The slope excavation support method includes:

[0032] Step S1: The unstable slope in the landslide area 6 is cut to form an excavated slope 8.

[0033] The landslide area is treated by slope cutting, and the unstable slope is excavated according to the gentlest stable slope ratio in order to remove as much landslide material as possible, stabilize the existing slope and form an excavated slope.

[0034] The excavated slope 8 extends to the soil-rock boundary line 2, that is: the soil slope is excavated to the soil-rock boundary line 2; the soil-rock boundary line 2 is the boundary between the lithological layer and the soil layer.

[0035] When restricted by a retaining wall, a horizontal distance of 2-10m should be maintained between the slope opening line and the toe of the roadbed retaining wall 1 to protect the wall of the roadbed retaining wall 1; the opening line is the intersection line between the slope surface and the original ground line 5; when not restricted by the toe of the roadbed retaining wall, the excavation slope ratio is controlled according to the stable slope ratio during the construction period.

[0036] Step S2: Backfilling and counter-pressure are carried out on the excavated slope 8 to form a temporary stable slope 12;

[0037] The backfill materials, such as counterweight soil and stone chips, are selected according to the slope conditions and specifications; the compaction degree, moisture content, and porosity of the backfill counterweight soil and stone chips are controlled according to specifications; the slope of the backfill counterweight soil and stone chips is the stable slope during the construction period; a platform is reserved at the top of the backfill slope;

[0038] The process of dumping soil and rock debris proceeds from upstream to downstream and from top to bottom. When dumping soil and rock debris from upstream to downstream, the working face must simultaneously meet the following conditions before proceeding downstream:

[0039] The difference between the backfill elevation of the centerline of the next section of the retaining wall and the elevation of the top of the slope is less than 5m.

[0040] The width of the platform reserved at the backfill location meets the requirements.

[0041] Both the soil and rock slopes have reached the stable slope during the construction period.

[0042] Step S3: Reinforce the retaining wall 1 of the roadbed above the landslide area with anchor cables 17;

[0043] The arrangement of anchor cables 17 shall be carried out as needed according to the current condition of the retaining wall 1 above the landslide area and in accordance with the specifications.

[0044] Step S4: The temporary stable slope 12 is excavated and supported in layers down to the design elevation 13 of the channel bottom.

[0045] The excavation construction sequence is from top to bottom and layered construction. The slope excavation can only be carried out after the construction of the slope top elevation platform is completed.

[0046] The slope support method is to use an anchor plate concrete 15 and arrange system anchors 16; the system anchors 16 are welded to the surface steel mesh of the anchor plate concrete 15.

[0047] The arrangement of the system anchor bolts 16 shall be carried out in accordance with the specifications;

[0048] The anchor plate concrete is poured to a height of 15 minutes. Excavation of the next layer can only proceed after the anchor plate concrete reaches the required strength. For example, if the anchor plate concrete reaches the required strength at the 15-minute pouring height, excavation of the next layer can only begin 3 days after the 15-minute pour.

[0049] Repeat the above steps until the excavation reaches the design elevation.

[0050] This invention can effectively solve problems such as slope instability, the combination of support and lining, and construction difficulties in the construction process of collapsed slopes, especially channel collapsed slopes. The method is simple and improves construction efficiency.

[0051] A more detailed embodiment is described below:

[0052] In this embodiment, the method for excavation and support of collapsed slopes involves cutting the slope of the cutting area 6 on the slope top platform 4, and then setting up a backfill counterweight 11 to form a temporary stable slope 12 and an adjusted slope top platform 4. Further excavation and support are then carried out to ensure construction safety and improve construction efficiency.

[0053] In this embodiment, when constructing the slope cutting area 6, it is necessary to ensure that the width of the slope top platform 4 is a certain safe distance from the toe of the roadbed retaining wall 1, for example, 2m.

[0054] Specifically, when constrained by the toe of the retaining wall 1 in the previous step, the excavated slope 8 formed by the slope cutting treatment has the gentlest stable slope ratio until it intersects with the rock slope 9. When not constrained by the toe of the retaining wall 1, the slope ratio of the excavated slope 8 is not steeper than 1:1.3.

[0055] After the excavation of slope 8 is completed, the backfill counterweight 11 is constructed. Optionally, the backfill material may be selected based on site conditions and slope soil conditions, such as soil or gravel.

[0056] Specifically, the backfill materials such as counterweight soil and stone chips shall be constructed in accordance with the specifications. The compaction degree, moisture content, and porosity of the backfill counterweight soil and stone chips shall be constructed in accordance with the specifications. For example, the compaction degree shall not be less than 0.9, the moisture content shall be controlled at 11% to 17%, and the porosity shall be less than 30%.

[0057] In this embodiment, the slope of the temporary stable slope 12 formed after backfilling with counterweight soil and gravel is 1:1.73. Specifically, the backfilling of counterweight soil and gravel is carried out in accordance with the construction procedure from top to bottom and from upstream to downstream, starting from the slope top platform 4. During construction, the width of the slope top platform 4 is, for example, not less than 7m.

[0058] Construction can only proceed downstream when the following conditions are met simultaneously: the difference between the backfill elevation in the next section of the roadbed retaining wall and the height of the backfilled slope top platform 4 is less than 5m; the width of the backfilled slope top platform 4 is, for example, not less than 7m; and the slope of the temporary stable slope 12 reaches the construction period stable slope in both directions, for example, 1:1.73.

[0059] Optionally, during the process of reinforcing the roadbed retaining wall 1 with anchor cables, the arrangement of anchor cables 17 is based on the current condition of the roadbed retaining wall 1 above the collapse area and is carried out as needed according to the specifications. For example, the anchor cables 17 are arranged with a strength of 600KN and a penetration depth of 15m into the rock.

[0060] Optionally, in this embodiment, the excavation slope is, for example, 1:0.7, and the support method is, for example, anchored plate concrete 15.

[0061] It should be noted that, in this embodiment, during the excavation and support process, the system anchor bolts 16 are welded to the surface steel mesh of the anchor plate.

[0062] Optionally, the system anchor bolts 16 are arranged, for example, as C28@1.5m×1.5m. Drainage pipes 18, for example, as D50@1.5m×1.5m, are arranged within the concrete anchor plate 15 in a staggered pattern at an elevation angle of 10°. The concrete anchor plate 15 is arranged, for example, with a thickness of 0.6m, and structural joints, 2cm wide, are arranged every 10m, filled with closed-cell foam board.

[0063] It should be noted that, in this embodiment, during the support construction process, the anchor plate construction should be carried out in a top-down, layered construction sequence.

[0064] Specifically, slope excavation can only begin after the first row of anchor piles and anchor plates on the slope top platform 4 are completed. Based on the spacing of the system anchor bolts 16, the required excavation depth for each row of anchor bolts is determined, for example, to be 1.5m. The anchor plate concrete 15 is poured at a height of, for example, 3m. The next layer of excavation can begin after the anchor plate concrete 15 has reached the required strength, for example, 3 days after pouring.

[0065] This utility model proposes an excavation and support structure for landslide slopes, comprising: cutting the soil in the landslide area to form an excavated slope; backfilling and counter-compacting the excavated slope to form a backfilled slope; reinforcing the retaining wall of the roadbed above the landslide area with anchor cables; and excavating and supporting the backfilled slope to the design elevation. This utility model can effectively solve problems such as slope instability, integration of support and lining, and construction difficulties during the construction of landslide slopes, especially channel landslide slopes. The method is simple and improves construction efficiency.

[0066] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A collapse-prone slope excavation support structure, characterized by, It includes roadbed retaining wall (1), slope top platform (4), excavated slope (8), backfill counterweight (11), temporary stabilizing slope (12) and anchor cable (17). The unstable slope in the landslide area is cut to form the excavated slope (8); the top of the excavated slope (8) has the top platform (4); the upper part of the landslide area has the roadbed retaining wall (1), the roadbed retaining wall (1) is reinforced by the anchor cable (17); the backfill is backfilled to the outside of the excavated slope (8) to form the backfill counterweight body (11), forming the temporary stable slope (12).

2. A collapse-slip slope excavation support structure according to claim 1, characterised in that, The bottom of the excavated slope (8) extends to the position where the soil-rock boundary line (2) intersects with the rock slope surface (9).

3. A collapse-slip slope excavation support structure according to claim 1, wherein The slope opening line of the excavated slope (8) and the slope toe of the roadbed retaining wall (1) shall be 2-10m apart horizontally.

4. A collapse-slip slope excavation support structure according to claim 1, wherein The backfill material of the backfill counterweight body (11) is soil and stone slag filling material.

5. A collapse-slip slope excavation support structure according to claim 1, wherein The anchor cable (17) is inserted 15m into the rock.

6. A collapse-slip slope excavation support structure according to claim 1, wherein The slope of the temporary stable slope (12) is 1:1.

73.

7. The slope excavation support structure according to claim 1, characterized in that, When the temporary stable slope (12) is excavated and supported in stages to the design elevation (13) of the channel bottom, anchor plate concrete (15) is poured on the slope surface after excavation.

8. The slope excavation and support structure according to claim 7, characterized in that, The anchor plate concrete (15) is reinforced with spaced system anchors (16); the system anchors (16) are welded to the surface steel mesh of the anchor plate concrete (15).

9. A slope excavation support structure according to claim 7, characterized in that, Drainage pipes (18) are arranged at intervals within the concrete anchor plate (15); the drainage pipes (18) are arranged in a quincunx pattern with an elevation angle of 10°.

10. A slope excavation support structure according to claim 7, characterized in that, The anchor plate concrete (15) is provided with structural joints at intervals, and the joints are filled with closed-cell foam board.

Images