Anti-slip pile assembly with earthquake-resistant drainage function and construction method thereof

Abstract

The present invention relates to the field of landslide prevention and control, specifically to an anti-slip pile assembly with seismic drainage capabilities and its construction method. The anti-slip pile assembly comprises an anti-slip pile, a retaining wall sheathed around the anti-slip pile, a buffer drainage layer disposed on the water-facing side of the retaining wall, and a drainage device disposed at the bottom of the buffer drainage layer. The anti-slip pile assembly with seismic drainage capabilities described in this application not only reduces the seismic inertial force directly borne by the anti-slip pile, thereby enhancing the pile's seismic resistance, but also reduces the downward force of the sliding body, significantly minimizing the impact of groundwater within the sliding body on the anti-slip pile or retaining wall.

Description

Technical Field

[0001] The present invention relates to the field of landslide prevention and control, and specifically to an anti-slide pile assembly with earthquake-resistant drainage function and a construction method thereof. Background Art

[0002] my country has seen rapid infrastructure development in recent years, with numerous railway and highway projects traversing high-intensity earthquake zones. For example, the Sichuan-Tibet Railway passes through numerous earthquake zones with magnitudes of 8 and 9. Secondary disasters such as landslides and rock piles are frequent in these areas, significantly impacting infrastructure development.

[0003] Anti-slide piles are a primary measure for landslide prevention and control. Piles penetrate the landslide body and extend deep into the slide bed to support the sliding force of the sliding body and stabilize the slope. They are widely used in engineering projects. Currently, large-section reinforced concrete bored piles are often used for landslide prevention and control in high-intensity earthquake zones. These rigid structures are prone to significant deformation, shearing, or displacement of the anti-slide piles under high-intensity earthquakes.

[0004] Chinese patent number CN 109235460 discloses a "double-limb energy-absorbing anti-slip pile and its construction method", which includes a main-limb anti-slip pile, a secondary-limb anti-slip pile and an energy-absorbing connecting rod system. This structure can improve the seismic performance of the anti-slip pile, but it has certain limitations: (1) The energy-absorbing connecting rod system is composed of a sleeve, a piston rod, a spring, a lead block, etc., and has been in service in harsh environments for a long time, with limited durability and complex maintenance; (2) The construction of this structure is complex, and the construction quality is not easy to guarantee. Chinese patent number CN106522270 discloses "a pile-based retaining wall seismic support structure containing an EPS buffer layer and its construction method." Its structure includes a gravity retaining wall, an EPS buffer layer, a concrete base, and anti-slip piles. The structure uses the EPS buffer layer to reduce the lateral earth pressure and deformation of the rigid retaining structure under seismic loads. However, it is mainly suitable for high-fill projects and is not suitable for landslide prevention. Moreover, the EPS material used in the structure blocks the drainage of water behind the wall, aggravates the sliding force, and is not conducive to slope stability.

[0005] Water is a key factor in landslide development. Water seepage causes the sliding mass, increases its weight, softens the soil, and reduces the shear strength of the soil-rock layer, leading to landslides. Therefore, drainage is a crucial method for landslide prevention. However, conventional anti-slide piles are ineffective in draining water. Summary of the Invention

[0006] The purpose of the present invention is to overcome the problems existing in the prior art: large-section anti-slip piles are rigid structures, which are prone to large deformation, shearing or displacement under the action of high-intensity earthquakes; the anti-slip pile structure cannot effectively remove groundwater in the sliding body, which easily leads to increased sliding force. An anti-slip pile assembly with seismic drainage function and a construction method thereof are provided, which can greatly reduce the probability of deformation, shearing or displacement of the anti-slip piles under the action of high-intensity earthquakes, reduce the sliding force of the sliding body, and greatly reduce the influence of groundwater in the sliding body on the anti-slip piles or retaining walls.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] An anti-slip pile assembly with anti-seismic drainage function includes an anti-slip pile, a protective wall is provided on the outer side of the anti-slip pile, a buffer drainage layer is provided on the water-facing side of the protective wall, a drainage hole is provided at the bottom of the buffer drainage layer, a water collection well is provided on the anti-slip pile, and the drainage hole is connected to the water collection well.

[0009] The retaining wall is located around the anti-sliding piles and is used to maintain the stability of the anti-sliding pile hole wall during the excavation process to avoid collapse; during construction, the buffer drainage layer is arranged on the retaining wall close to the upstream side of the sliding body. Under the action of an earthquake, it can deform to absorb the inertial force generated by the earthquake, reduce the earthquake inertial force directly borne by the anti-sliding piles, and improve the seismic resistance of the anti-sliding piles. At the same time, the groundwater in the sliding body can be drained to the bottom of the buffer drainage layer, and a drainage hole is provided at the bottom of the buffer drainage layer. The drainage hole passes through the retaining wall and the anti-sliding piles to guide the groundwater to the water collection well, thereby discharging the water at the bottom of the buffer drainage layer to the water collection well, thereby effectively removing the groundwater in the sliding body. While avoiding the saturation of the sliding body and increasing the sliding force, it also prevents the groundwater from softening the soil and improves the stability of the landslide.

[0010] To sum up, the anti-sliding pile assembly with anti-seismic drainage function described in the present application not only reduces the seismic inertia force directly borne by the anti-sliding pile, thereby improving the anti-seismic ability of the anti-sliding pile, but also reduces the sliding force of the sliding body, greatly reduces the impact of groundwater in the sliding body on the anti-sliding piles or retaining walls, and improves the stability of the sliding body.

[0011] Preferably, the retaining wall is anchored to the buffer drainage layer.

[0012] The fixed anchor rods are used to fix the buffer drainage layer on the well wall to prevent it from falling during construction.

[0013] Preferably, the drainage hole is connected to the middle of the water collection well, so that groundwater can be better introduced into the water collection well.

[0014] Preferably, the top of the water collection well is open.

[0015] Preferably, the water collection well is a rectangular hole.

[0016] Preferably, the anti-slip pile assembly with earthquake-resistant drainage function described in the present invention further includes a drainage pipe, one end of which is located at the bottom of the water collection well, and the other end is located outside the anti-slip pile.

[0017] One end of the drainage pipe is located at the bottom of the water collection well, and the other end is located outside the anti-slip pile, which is used to pump the accumulated water in the water collection well to the outside of the pile or to drain the accumulated water in the water collection well to the outside of the pile using the siphon principle.

[0018] Preferably, the buffer drainage layer is composed of geosynthetics with a three-dimensional mesh structure.

[0019] The buffer drainage layer is composed of a three-dimensional mesh, has certain elasticity and strong drainage capacity.

[0020] Preferably, a water-proof layer is provided at the bottom of the buffer drainage layer, and the water-proof layer is used to prevent groundwater in the sliding body from penetrating below the sliding surface.

[0021] Preferably, the waterproof layer is a structural member composed of a composite geomembrane.

[0022] The present invention also discloses a construction method for forming the anti-slip pile assembly with earthquake-resistant drainage function, comprising the following steps:

[0023] S1. Excavating anti-sliding pile wells in the sliding body in sections;

[0024] S2. Construct reinforced concrete retaining wall and buffer drainage layer in sections;

[0025] S3. When the buffer drainage layer is constructed to the slippery surface, a water-insulating layer is laid at the bottom of the buffer drainage layer and the drainage holes are installed;

[0026] S4. Continue to excavate the anti-sliding pile wells in sections and construct retaining walls to the bottom of the anti-sliding piles;

[0027] S5. Tie up the anti-sliding pile reinforcement cage and install the water collection well formwork;

[0028] S6. Pouring concrete to form the anti-slide piles and the water collection well.

[0029] The construction method for forming the anti-slip pile assembly with anti-seismic drainage function described in the present invention can ensure the effective construction of the anti-slip pile assembly with anti-seismic drainage function, and the construction is simple and convenient.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The anti-slip pile assembly with seismic drainage function described in this application not only reduces the seismic inertia force directly borne by the anti-slip pile, thereby improving the seismic resistance of the anti-slip pile, but also reduces the sliding force of the sliding body, thereby greatly reducing the impact of groundwater in the sliding body on the anti-slip pile, retaining wall and landslide stability.

[0032] 2. The anti-slip pile assembly with anti-seismic drainage function described in this application, the fixed anchor rod is used to fix the buffer drainage layer on the well wall to prevent it from falling during construction.

[0033] 3. The anti-slip pile assembly with earthquake-resistant drainage function described in this application has a buffer drainage layer composed of a three-dimensional mesh body, which has certain elasticity and strong drainage capacity.

[0034] 4. The construction method for forming the anti-slip pile assembly with earthquake-resistant drainage function described in the present invention can ensure the effective construction of the anti-slip pile assembly with earthquake-resistant drainage function, and the construction is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural schematic diagram (front view) of an anti-slip pile assembly with earthquake-resistant drainage function according to the present invention.

[0036] Figure 2 For the present invention Figure 1 A is an enlarged schematic diagram.

[0037] Figure 3 This is a schematic structural diagram (top view) of an anti-slip pile assembly with earthquake-resistant drainage function according to the present invention.

[0038] Markings in the figure: 1-sliding bed, 2-sliding body, 3-sliding surface, 4-anti-sliding piles, 5-protection wall, 6-buffer drainage layer, 7-fixed anchor rod, 8-water collection well, 9-drainage pipe, 10-sluice hole, 11-water-isolating layer, 12-drainage device. DETAILED DESCRIPTION

[0039] 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.

[0040] Example 1

[0041] like Figure 1-3 As shown, an anti-slip pile assembly with earthquake-resistant drainage function includes an anti-slip pile 4, a retaining wall 5, a buffer drainage layer 6, a fixed anchor rod 7, a water collection well 8, a drainage pipe 9, a drainage hole 10, and a waterproof layer 11;

[0042] The anti-slide pile 4 is made of reinforced concrete, passes through the sliding body, and is anchored at its lower end in a stable sliding bed. The retaining wall 5 is located around the anti-slide pile and is made of reinforced concrete. It is used to maintain the stability of the anti-slide pile hole wall during excavation to prevent collapse.

[0043] The buffer drainage layer 6 is located behind the retaining wall 5 and can deform under the action of an earthquake to absorb the inertial force generated by the earthquake, while draining the groundwater in the sliding body to the bottom of the buffer drainage layer 6. The buffer drainage layer 6 is made of geosynthetics and has a three-dimensional mesh structure with a thickness of 5 to 50 cm, a compressive strength of not less than 0.2 MPa, and an elastic modulus of not less than 1 MPa.

[0044] The buffer drainage layer provided by the present invention can adopt different thicknesses according to the scale of the landslide and the intensity of the earthquake, and has flexible application and a wide range of applicability;

[0045] The fixed anchor rods 7 are used to fix the buffer drainage layer 6 to the well wall to prevent it from falling during construction. The fixed anchor rods 7 are made of HRB400 steel bars with a diameter of 25 mm, a length of 0.5 to 1 m, and a spacing of 2 to 3 m. The drainage holes 10 are located at the bottom of the buffer drainage layer 6, passing through the retaining wall 5 and the anti-slip piles 4, and are used to guide groundwater into the water collection well 8. The drainage holes 10 are made of PVC pipes with a diameter of 10 cm. The side close to the buffer drainage layer 6 should extend into the buffer drainage layer 6 by no less than 10 cm, and the side close to the drainage well 8 should extend by no less than 10 cm.

[0046] The waterproof layer 11 is located at the bottom of the buffer drainage layer 6 and is used to prevent the groundwater in the sliding body 2 from penetrating into the sliding surface 3. The waterproof layer 11 is composed of a composite geomembrane with a hydrostatic pressure resistance of not less than 0.6 MPa and a permeability coefficient of not more than 10 -11 cm / s.

[0047] The water collection well 8 is a rectangular hole formed in the anti-sliding pile 4. The side length of the water collection well 8 is not less than 0.8m, and the bottom of the well is not less than 5m below the sliding surface.

[0048] One end of the drainage pipe 9 is located at the bottom of the water collection well 8, and the other end is located outside the anti-slip pile 4. It is used to pump the accumulated water in the water collection well to the outside of the pile. The drainage pipe 9 is composed of a PVC hose. One end of the drainage pipe 9 is fixed to the bottom of the water collection well 8, and the other end is led to a flat area outside the anti-slip pile 4.

[0049] Beneficial effects of this embodiment: The anti-slip pile assembly with earthquake-resistant drainage function described in this embodiment not only greatly reduces the probability of deformation, shearing or displacement of the anti-slip pile under the action of high-intensity earthquakes, but also reduces the sliding force of the sliding body, greatly reduces the influence of groundwater in the sliding body 2 on the anti-slip pile 4 or the retaining wall 5, and improves the stability of the sliding body; the anti-slip pile assembly also has the functions of buffering, energy dissipation, drainage and support, which can reduce the project cost.

[0050] Example 2

[0051] like Figure 1-3 As shown, the construction method for forming the anti-slip pile assembly with earthquake-resistant drainage function described in this embodiment comprises the following construction steps:

[0052] A1. Excavate 4 anti-slide pile wells in sections, with each section excavated to a depth of 0.5 to 2 meters;

[0053] A2, fix the buffer drainage layer 6 to the same depth as the anti-slide pile 4 pile well excavation depth on the pile well wall with a fixed anchor rod 7;

[0054] A3. Construction of reinforced concrete retaining wall 5;

[0055] A4. Repeat steps A1 to A3 until the excavation reaches the sliding surface 3;

[0056] A5. Lay a water-proof layer 11 at the bottom of the buffer drainage layer 6 and install drain holes 10;

[0057] A6. Excavate 4 anti-slide pile wells in sections, with each section excavated to a depth of 0.5 to 2 meters;

[0058] A7. Construction of reinforced concrete retaining wall 5;

[0059] A8. Repeat steps A6 to A7 until the excavation reaches the bottom of the anti-slip pile 4;

[0060] A9, tie up the anti-slide pile reinforcement cage and install the template of the water collection well 8;

[0061] A10, pouring concrete to form anti-slide piles 4 and water collection wells 8;

[0062] A11. Fix the drainage pipe 9, check regularly and drain the accumulated water in the water collection well through the drainage pipe 9.

[0063] Beneficial effects of this embodiment: The construction method for forming the anti-slip pile assembly with earthquake-resistant drainage function described in this embodiment can ensure the effective construction of the anti-slip pile assembly with earthquake-resistant drainage function, and the construction is simple and convenient.

[0064] 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 construction method for forming an anti-slip pile assembly with earthquake-resistant drainage function, characterized by: The anti-sliding pile assembly with earthquake-resistant drainage function comprises an anti-sliding pile (4), a protective wall (5) is provided on the outer side of the anti-sliding pile (4), a buffer drainage layer (6) is provided on the water-facing side of the protective wall (5), a drainage hole (10) is provided at the bottom of the buffer drainage layer (6), a water collection well (8) is provided on the anti-sliding pile (4), and the drainage hole (10) is connected to the water collection well (8); the buffer drainage layer (6) can deform to absorb the inertial force generated by an earthquake, and the buffer drainage layer (6) can drain groundwater in the sliding body to the bottom of the buffer drainage layer (6); It also includes a drainage pipe (9), one end of which is located at the bottom of the water collection well (8) and the other end of which is located outside the anti-slip pile (4); The buffer drainage layer (6) is composed of a geosynthetic material with a three-dimensional mesh structure; A water-blocking layer (11) is provided at the bottom of the buffer drainage layer (6), and the water-blocking layer (11) is used to prevent groundwater in the sliding body (2) from penetrating below the sliding surface (3); The construction method comprises the following steps: S1, excavating anti-slide pile (4) wells in sections in the sliding body (2); S2, construct reinforced concrete retaining wall (5) and buffer drainage layer (6) in sections; S3, when the buffer drainage layer (6) is constructed to the sliding surface (3), a water-insulating layer (11) is laid at the bottom of the buffer drainage layer (6), and the drainage hole (10) is installed; S4, continue to excavate the anti-sliding pile (4) well in sections, and construct the retaining wall (5) to the bottom of the anti-sliding pile (4); S5, tying up the anti-sliding pile reinforcement cage and installing the template of the water collection well (8); S6. Concrete is poured to form the anti-slide pile (4) and the water collection well (8).

2. A construction method for forming an anti-slip pile assembly with earthquake-resistant drainage function according to claim 1, characterized in that: The protective wall (5) is anchored to the buffer drainage layer (6).

3. The construction method for forming an anti-slip pile assembly with earthquake-resistant drainage function according to claim 1, characterized in that: The drainage hole (10) is connected to the middle of the water collection well (8).

4. A construction method for forming an anti-slip pile assembly with earthquake-resistant drainage function according to claim 3, characterized in that: The top of the water collection well (8) is open.

5. A construction method for forming an anti-slip pile assembly with earthquake-resistant drainage function according to claim 4, characterized in that: The water collection well (8) is a rectangular hole.

6. A construction method for forming an anti-slip pile assembly with earthquake-resistant drainage function according to claim 1, characterized in that: The water-proof layer (11) is a structural member composed of a composite geomembrane.

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