A large-scale deep landslide prevention and control structure and its construction method

Abstract

The present invention relates to the field of landslide prevention and control, specifically to a large-scale deep-seated landslide prevention and control structure and its construction method. The large-scale deep-seated landslide prevention and control structure includes a crown beam and a water collection well. Several protective piles are arranged circumferentially around the outer side of the water collection well. The crown beam is connected to all of the protective piles and is disposed above the protective piles. The large-scale deep-seated landslide prevention and control structure described in the present invention is both a high-resistance anti-slip pile and a water collection well with strong drainage capacity. It causes minimal disturbance to the sliding body, can be constructed using machinery, and is suitable for landslide prevention and control during the development phase. It also has stronger overall bending resistance, simpler and safer construction, and reduces the risks of excavating water collection wells and anti-slip piles.

Description

Technical Field

[0001] The present invention relates to the field of landslide prevention and control, and specifically to a large-scale deep landslide prevention and control structure and a construction method thereof. Background Art

[0002] Large-scale deep landslides refer to landslides with a sliding mass exceeding 1 million cubic meters. They are characterized by large scale, thick sliding mass, large landslide thrust, and extremely difficult to prevent and control. Currently, the main measures for preventing and controlling large-scale deep landslides are drainage and anchoring:

[0003] 1. Anti-slide piles in anchoring measures, especially large-section anti-slide piles, have a large section moment of inertia and can withstand large landslide thrust. Therefore, they have been widely used in landslide prevention and control in recent years. However, they also have limitations, as follows:

[0004] The construction period of large-section anti-slide piles is long, and they are easy to disturb the landslide during excavation, inducing landslide instability. They are not suitable for landslide prevention and control in the development stage, and are not suitable for emergency rescue.

[0005] Because bored piles have limited drilling cross-sections, large-section anti-slide piles are often constructed using manual excavation, which results in a poor underground working environment and high risks.

[0006] Although the cross-section of the anti-slide piles currently used is relatively large (such as 3.5m×4.5m), the anti-slide force they can provide is still insufficient compared to the landslide thrust generated by large deep landslides. If the cross-section of the anti-slide piles is further increased, the construction difficulty and cost will increase significantly.

[0007] Second, drainage technology is the most common measure for landslide control. It involves intercepting and draining both surface water and groundwater. Surface water interception aims to prevent surface water from entering the sliding mass to the greatest extent possible and to drain surface water above the sliding mass to prevent it from seeping into the landslide. Underground drainage aims to minimize the groundwater level within the landslide. Large-diameter water collection wells (3.5-4.0 m) used in drainage technology can effectively lower the groundwater level within the sliding mass and improve landslide stability. However, large-diameter water collection wells have limited cross-sectional bending resistance and are easily damaged. Furthermore, like large-section anti-slide piles, large-diameter water collection wells are often constructed using manual excavation, which carries a high operational risk. Summary of the Invention

[0008] The purpose of the present invention is to overcome the problems existing in the prior art: conventional large-section anti-slip piles have a long construction period, high risk of manual excavation, easy disturbance of landslides, and are not suitable for landslide prevention and control in the development period; conventional large-diameter water collection wells have limited bending resistance, are easy to damage, and are difficult to construct. A large-scale deep landslide prevention and control structure and its construction method are provided, which can provide both high-resistance anti-slip piles and water collection wells with strong drainage capacity; the disturbance to the sliding body is small, it can be constructed by machine, and is suitable for landslide prevention and control in the development period; the overall bending resistance is stronger, the construction is simpler and safer, and the risk of excavating water collection wells and anti-slip piles is reduced.

[0009] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0010] A large-scale deep landslide prevention and control structure comprises a crown beam and a water collection well. Several protection piles are arranged circumferentially outside the water collection well. The crown beam is connected to all the protection piles and is arranged on top of the protection piles.

[0011] The large-scale deep landslide prevention and control structure described in the present invention has a plurality of protective piles arranged along a circle, and then all the protective piles are connected into a whole that can provide greater resistance through a crown beam to replace the large-section anti-slip piles and withstand the thrust of the landslide. Moreover, during construction, the protective piles can be constructed in sequence. Compared with the existing large-section anti-slip pile construction, the degree of disturbance of the landslide caused by the construction is greatly reduced, and the collapse of the sliding body on the pile side during the excavation process is avoided. Moreover, since the diameter of a single protective pile is much smaller than the diameter of the large-section anti-slip pile, it can be directly operated by machine, thereby avoiding manual digging construction and reducing construction risks. It is suitable for landslide prevention and control in the development stage.

[0012] At the same time, under the same construction constraints, compared with the large-section anti-slip piles in the prior art, the above solution can obtain a larger combined cross-section, thereby providing greater anti-slip force.

[0013] Moreover, setting up several protection piles along the circumference can serve as a protective structure for the excavation of the water collection well, thereby preventing the sliding body near the water collection well from collapsing during the excavation process.

[0014] To sum up, the large-scale deep landslide prevention and control structure described in the present invention is not only an anti-slip pile that can provide high resistance, but also a water collection well with strong drainage capacity; it has little disturbance to the sliding body, can be constructed by machine, and is suitable for landslide prevention and control in the development period. It also has stronger overall bending resistance, simpler and safer construction, and reduces the risk of excavating water collection wells and anti-slip piles.

[0015] Preferably, a drainage hole is provided on the side wall of the water collection well, one end of the drainage hole is connected to the water collection well, and the other end is connected to the sliding body, and the end of the drainage hole close to the sliding body is higher than the end of the drainage hole close to the water collection well.

[0016] A drainage hole is provided on the side wall of the water collection well, one end of the drainage hole is connected to the water collection well, and the other end is connected to the sliding body. The end of the drainage hole close to the sliding body is higher than the end of the drainage hole close to the water collection well, so as to discharge the water in the sliding body into the water collection well, thereby effectively lowering the groundwater level in the sliding body and improving the stability of the landslide.

[0017] Preferably, all the protection piles are arranged in a ring shape.

[0018] Preferably, the crown beam is located on the top of the protective piles and is a ring-shaped structure. The crown beam is used to connect the protective piles evenly arranged in a circle into a whole, and an opening is left in the middle to connect to the water collection well, so as to facilitate water pumping using a pump.

[0019] Preferably, a bottom plate is provided at the bottom of the water collection well, and the bottom plate is connected to all the protection piles.

[0020] The bottom plate is connected to all the protection piles, and the bottom plate serves as a force transmission mechanism to make the force on the surrounding multiple protection piles more uniform.

[0021] Preferably, a drainage wall is provided between adjacent protection piles, and the drainage hole is provided on the drainage wall.

[0022] Preferably, the drainage retaining wall is made of sandless concrete.

[0023] The drainage retaining wall can prevent the soil between the protection piles from collapsing during the excavation of the water collection well, and can also allow groundwater in the sliding body to be discharged into the water collection well, thereby playing a drainage role.

[0024] Preferably, a well wall is provided on the side wall of the water collection well, the well wall is located inside the drainage protective wall, and the drainage hole passes through the well wall.

[0025] As a permanent structure, the well wall can support the drainage retaining wall to prevent the drainage retaining wall from being damaged and collapsed under the action of long-term drainage; and the well wall can enhance the bending resistance of the large-scale deep landslide prevention and control structure.

[0026] Preferably, the bottom plate is sealed to the well wall to seal the well bottom.

[0027] Preferably, the drain holes are arranged between adjacent protection piles.

[0028] Preferably, the large-scale deep landslide prevention and control structure described in the present invention further includes an isolation layer, which includes an outer isolation layer and an inner isolation layer. The outer isolation layer is arranged on the outside of the drainage retaining wall, and the inner isolation layer is arranged on the inside of the drainage retaining wall.

[0029] The outer isolation layer is used to prevent fine particles in the soil from entering the drainage retaining wall and blocking the drainage channel; the inner isolation layer is used to prevent the well wall concrete from blocking the drainage channel in the drainage retaining wall during the pouring process.

[0030] Preferably, all the drainage holes between adjacent protection piles are spaced apart from top to bottom, and a plurality of drainage holes are provided so that the water in the sliding body can be better drained to the water collection well.

[0031] Preferably, a drainage pipe is further included, one end of the drainage pipe is connected to the water collection well, and the other end is connected to the outside world, and the external water outlet of the drainage pipe is located lower than the internal water inlet.

[0032] The present invention also discloses a construction method for forming the large-scale deep landslide prevention and control structure, comprising the following steps:

[0033] S1. Construct protective piles, with the lower portion of the protective piles extending below the sliding surface;

[0034] S2. constructing a crown beam on the upper part of the protection piles to connect the crown beam with all the protection piles;

[0035] S3, dig water collection wells in sections;

[0036] S4. Laying the outer isolation layer;

[0037] S5. Installing a template for the drainage retaining wall, installing a drain hole, and pouring sandless concrete in the template for the drainage retaining wall to form the drainage retaining wall;

[0038] S6, repeat steps S4 to S5 until the bottom plate;

[0039] S7. Drill holes and install drainage pipes;

[0040] S8, pouring base plate concrete and connecting the base plate to all the protection piles;

[0041] S9, laying an inner isolation layer, carrying out well wall construction, and sealingly connecting the well wall to the bottom plate.

[0042] The construction method for forming the large-scale deep landslide prevention and control structure described in the present application can effectively ensure the construction of the large-scale deep landslide prevention and control structure, and can construct protective piles in sequence. Compared with the existing large-section anti-slip pile construction, it greatly reduces the degree of disturbance of the construction to the landslide, and avoids the collapse of the sliding body on the pile side during the excavation process. Moreover, since the diameter of a single protective pile is much smaller than the diameter of the large-section anti-slip pile, it can be directly operated by machine, thereby avoiding manual digging construction and reducing construction risks. It is suitable for landslide prevention and control in the development stage.

[0043] Preferably, before step S1, a ditch is constructed around the sliding body to drain surface water at the sliding body construction location to reduce construction risks.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. The large-scale deep landslide prevention and control structure described in this application is both an anti-slip pile that can provide high resistance and a water collection well with strong drainage capacity; it has little disturbance to the sliding body, can be constructed by machine, and is suitable for landslide prevention and control in the development stage. It also has stronger overall bending resistance, simpler and safer construction, and reduces the risk of excavating water collection wells and anti-slip piles.

[0046] 2. The large-scale deep landslide prevention and control structure described in this application, wherein the drainage retaining wall can prevent the collapse of soil between small protective piles during the excavation of the collection well, and can also drain groundwater in the sliding body by discharging it into the collection well.

[0047] 3. In the large-scale deep landslide prevention and control structure described in this application, the outer isolation layer is used to prevent fine particles in the soil from entering the drainage retaining wall and blocking the drainage channel; the inner isolation layer is used to prevent the well wall concrete from blocking the drainage channel in the drainage retaining wall during the pouring process.

[0048] 4. The large-scale deep landslide prevention and control structure described in this application has a bottom plate that is sealed with the well wall to seal the well bottom. The bottom plate is connected to all the protective piles, and the bottom plate serves as a force transmission mechanism to make the force on multiple surrounding protective piles more uniform.

[0049] 5. The large-scale deep landslide prevention and control structure described in this application adopts a composite anti-slip structure formed by small protective piles arranged in a ring, sandless concrete drainage wall, reinforced concrete well wall, crown beam and bottom plate. Compared with traditional large-section anti-slip piles, it has stronger bending resistance and can better play an anchoring role.

[0050] 6. The large-scale deep landslide prevention and control structure described in the present application adopts small protective piles, crown beams and sandless concrete drainage walls arranged in a ring as temporary support for the excavation of the collection well, and adopts reinforced concrete well walls as permanent support for the collection well, thereby ensuring the safety during the excavation of the collection well and forming a collection well with a larger cross-section. Compared with traditional collection wells, it has a stronger drainage capacity.

[0051] 7. The construction method for forming the large-scale deep landslide prevention and control structure described in the present invention and the proposed large-scale deep landslide prevention and control structure combined construction are particularly suitable for large-scale deep landslide prevention and control in the deformation development stage.

[0052] 8. The construction method for forming the large-scale deep landslide prevention and control structure described in the present invention can effectively ensure the construction of the large-scale deep landslide prevention and control structure, and can construct protective piles in sequence. Compared with the existing large-section anti-slip pile construction, it greatly reduces the degree of disturbance of the construction to the landslide, and avoids the collapse of the sliding body on the pile side during the excavation process. Moreover, since the diameter of a single protective pile is much smaller than the diameter of the large-section anti-slip pile, it can be directly operated by machine, thereby avoiding manual digging construction and reducing construction risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a schematic diagram (cross-sectional view) of a large-scale deep landslide prevention and control structure of the present invention.

[0054] Figure 2 Schematic diagram of the relative positions of the crown beam and the protection piles of the present invention (top view).

[0055] Figure 3 Schematic diagram (cross section) of the relative positions of the protection piles, drainage retaining wall and well wall of the present invention.

[0056] Figure 4 Schematic diagram (cross section) of the positions of the inner and outer isolation layers of the present invention.

[0057] Markings in the figure: 1-protection pile, 2-crown beam, 3-drainage retaining wall, 4-well wall, 5-isolation layer, 51-outer isolation layer, 52-inner isolation layer, 6-scupper hole, 7-drainage pipe, 8-bottom plate, 9-water collection well, 10-sliding body, 11-sliding surface, 12-sliding bed. DETAILED DESCRIPTION

[0058] The present invention will be further described in detail below in conjunction with test examples and specific embodiments. However, this should not be understood as limiting the scope of the present invention to the following embodiments, and all technologies implemented based on the present invention fall within the scope of the present invention.

[0059] Example 1

[0060] like Figures 1 to 4 A large-scale deep landslide prevention and control structure shown in FIG. 1 includes: a protective pile 1, a crown beam 2, a drainage retaining wall 3, a well wall 4, an isolation layer 5, a drainage hole 6, a drainage pipe 7, a bottom plate 8, and a water collection well 9;

[0061] The protective piles 1 are evenly arranged in a circle, and the diameter of the circle formed is preferably 4~8m. The small protective piles are reinforced concrete bored piles, and the diameter is preferably 1.0~2.0m; the protective piles 1 pass through the sliding surface 11 and extend into the sliding bed 12 to a certain depth; on the one hand, the protective piles 1 are used as a protective structure for the excavation of the water collection well 9 to avoid collapse during the excavation process; on the other hand, the protective piles 1 evenly arranged in a circle can form a combined structure, which can provide an anti-slip structure with greater resistance.

[0062] The crown beam 2 is located at the top of the protection pile 1 and is used to connect the protection piles 1 arranged evenly in a circular shape into a whole; the width of the crown beam 2 is consistent with the diameter of the protection pile 1, and the height is preferably 1.0-2.0m. The crown beam is made of reinforced concrete;

[0063] The water collection well 9 is a vertical well excavated downward from the surface of the sliding body after the construction of the protection pile 1 and the crown beam 2 is completed, and is used to collect and remove groundwater in the sliding body;

[0064] The drainage retaining wall 3 is located between adjacent protection piles 1 and is cast from sandless concrete. The drainage retaining wall 3 prevents soil collapse between the small protection piles during the excavation of the water collection well 9. On the other hand, it allows groundwater in the sliding body 10 to be drained into the water collection well 9.

[0065] The well wall 4 is annular and located inside the drainage retaining wall 3. It is made of reinforced concrete. On the one hand, it serves as a permanent structure to prevent the drainage retaining wall 3 from being damaged and collapsed under the action of long-term drainage. On the other hand, it can enhance the bending resistance of the large-scale deep landslide prevention and control structure. The thickness of the well wall 4 is preferably 40 to 80 cm.

[0066] The isolation layer 5 is located between the drainage retaining wall 3 and the well wall 4 and is made of non-woven geotextile, including an outer isolation layer 51 and an inner isolation layer 52; the outer isolation layer 51 is used to prevent fine particles in the soil from entering the drainage retaining wall and blocking the drainage channel; the inner isolation layer 52 is used to prevent the well wall concrete from blocking the drainage channel during the pouring process;

[0067] The drainage holes 6 are arranged from top to bottom along the well wall 4, with one row arranged between every two protection piles 1, with a vertical spacing of 1 to 2 meters and a diameter of preferably 80 mm to 150 mm;

[0068] The bottom plate 8 is located at the bottom of the water collection well 9 and is made of concrete. On the one hand, it plays the role of sealing the bottom of the well, and on the other hand, it serves as a force transmission mechanism to make the force on the surrounding multiple protective piles 1 more uniform.

[0069] The drainage pipe 7 is located above the bottom plate 8 and is used to drain the water in the water collection well 9 to the outside of the sliding body 10. There are 2 to 3 holes in the drainage pipe 7. The drainage pipe 7 is made of PVC pipe and the diameter is preferably 150 mm to 200 mm.

[0070] Example 2

[0071] like Figure 1-3 As shown, the construction method for forming the large-scale deep landslide prevention and control structure described in this embodiment includes the following construction steps:

[0072] A1. Construct intercepting ditches around the sliding body 10 to drain surface water within the sliding body 10;

[0073] A2. Level the site and stake out the location of the surrounding protective piles 1;

[0074] A3. Drill holes for perimeter protection piles 1, install steel cages, and pour underwater concrete;

[0075] A4. Tie the reinforcement of crown beam 2 at the top of the pile, install the formwork of crown beam 2, and pour the concrete of crown beam 2;

[0076] A5. Excavate water collection wells 9 in sections from the surface of the sliding body, with each section excavated to a depth of 0.5 to 2 meters;

[0077] A6. Lay the outer isolation layer 51. Short steel bars may be used to secure the outer isolation layer 51 within the soil during the laying process.

[0078] A7. Install the template for the drainage retaining wall 3, install the PVC pipe for the drain hole 6, and pour sandless concrete to form the drainage retaining wall 3;

[0079] A8. Repeat steps A6 to A7 until the bottom plate.

[0080] A9, drill holes to make drainage pipe 7, and install the PVC pipe of drainage pipe 7;

[0081] A10, pouring concrete for base plate 8;

[0082] A11. Lay the inner isolation layer 52, tie the steel bars of the well wall 4, install the formwork, pour the well wall concrete, and make the well wall 4 and the bottom plate 8 sealed.

[0083] The beneficial effects of this embodiment are as follows: The construction method for forming the large-scale deep landslide prevention and control structure described in this embodiment can ensure the effective construction of the large-scale deep landslide prevention and control structure, and the construction is simple and convenient. By comparison, it can be seen that compared with the existing large-section anti-slide pile construction, the construction method of the present invention reduces the project cost by approximately 20%.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A large-scale deep landslide prevention and control structure, characterized in that: The invention comprises a crown beam (2) and a water collection well (9), wherein a plurality of protective piles (1) are arranged circumferentially on the outer side of the water collection well (9), the crown beam (2) is connected to all the protective piles (1), and the crown beam (2) is arranged on the upper part of the protective piles (1); a drainage hole (6) is arranged on the side wall of the water collection well (9), and a drainage retaining wall (3) is arranged between adjacent protective piles (1); the drainage hole (6) is arranged on the drainage retaining wall (3), and the drainage hole (6) is used to discharge water in the sliding body (10) into the water collection well (9).

2. A large-scale deep landslide prevention and control structure according to claim 1, characterized in that: One end of the drainage hole (6) is connected to the water collection well (9), and the other end is connected to the sliding body (10). The end of the drainage hole (6) close to the sliding body (10) is higher than the end of the drainage hole (6) close to the water collection well (9).

3. A large-scale deep landslide prevention and control structure according to claim 2, characterized in that: A bottom plate (8) is provided at the bottom of the water collection well (9), and the bottom plate (8) is connected to all the protection piles (1).

4. A large-scale deep landslide prevention and control structure according to claim 3, characterized in that: A well wall (4) is provided on the side wall of the water collection well (9), the well wall (4) is located inside the drainage protective wall (3), and the drainage hole (6) passes through the well wall (4).

5. A large-scale deep landslide prevention and control structure according to claim 4, characterized in that: The bottom plate (8) is sealedly connected to the well wall (4).

6. A large-scale deep landslide prevention and control structure according to claim 4, characterized in that: It also includes an isolation layer (5), the isolation layer (5) including an outer isolation layer (51) and an inner isolation layer (52), the outer isolation layer (51) being arranged on the outside of the drainage retaining wall (3), and the inner isolation layer (52) being arranged on the inside of the drainage retaining wall (3).

7. A large-scale deep landslide prevention and control structure according to claim 6, characterized in that: It also includes a drainage pipe (7), one end of which is connected to the water collection well (9) and the other end is connected to the outside world, and the external water outlet of the drainage pipe (7) is located lower than the internal water inlet.

8. A construction method for forming the large-scale deep landslide prevention and control structure according to claim 7, characterized in that: The following steps are involved: S1, constructing a protective pile (1), wherein the lower portion of the protective pile (1) extends below the sliding surface (11); S2, constructing a crown beam (2) on the upper part of the protection pile (1), so that the crown beam (2) is connected to all the protection piles (1); S3, digging water collection wells in sections (9); S4, laying an outer isolation layer (51); S5, installing the template of the drainage retaining wall (3), installing the drain hole (6), and pouring sandless concrete in the template of the drainage retaining wall (3) to form the drainage retaining wall (3); S6, repeat steps S4 to S5 until the bottom plate; S7, drilling and installing drainage pipe (7); S8, pouring concrete for the base plate (8), and connecting the base plate (8) to all the protection piles (1); S9, laying an inner isolation layer (52), carrying out well wall (4) construction, and sealingly connecting the well wall (4) and the bottom plate (8).

9. The construction method according to claim 8, characterized in that: Before step S1, a drainage ditch is constructed around the sliding body (10) to drain the surface water at the construction location of the sliding body (10).

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