Pile-well-pipe combined system for large-scale water-rich landslide prevention and control

Abstract

The invention relates to a pile-well-pipe combined system for preventing and treating a large water-rich landslide, which comprises a water interception curtain structure arranged at the middle position of the landslide, a water collecting well positioned below the elevation of the water interception curtain structure, and a downstream tunnel for conveying and discharging underground water intercepted by the water interception curtain structure to the water collecting well, the inclined drainage pipe is used for draining water in the water collecting well to the ground surface; the water cut-off curtain structure comprises a seepage pipe pile set and anchor cable anti-slide piles closely arranged on the two sides of the seepage pipe pile set, the seepage pipe pile set comprises anchor cable water permeable piles and seepage pipes which are closely arranged in a staggered mode, drainage blind holes are formed in the bottoms of the anchor cable water permeable piles, and seepage tunnels are formed in the bottoms of the seepage pipes. The drainage blind hole and the water seepage tunnel are communicated to form a drainage channel which is communicated with the downstream tunnel. The combined mode of underground water interception, seepage drainage, water collection and water guide is adopted, the landslide terrain height difference is fully utilized to form an underground water three-dimensional interception and drainage network channel, and anti-skid drainage treatment of the large-scale water-rich landslide is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of landslide control, and in particular relates to a pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides. Background Art

[0002] How to effectively control groundwater is the main factor to ensure the success of landslide control. For the prevention and control of large landslides, the traditional method is to use underground drainage measures such as inclined drainage pipes, drainage tunnels, and water collection wells in combination with surface drainage measures to control the groundwater level in the slope. At the same time, as a new type of prevention and drainage structure, the permeable water-cutting wall pile with integrated anti-slip and drainage functions is also suitable for the control of large water-rich landslides. However, the above drainage measures have the following shortcomings: 1) The performance of the inclined drainage is not good in actual engineering, mainly reflected in the small and unstable water output. After long-term operation, the soil particles carried in the water body gradually settle and block the drainage holes, and eventually cause the drainage holes to fail. Secondly, when it is applied to large landslides, due to the deep sliding surface, the inclined drainage holes need to be deep below the sliding surface to achieve a better treatment effect. However, for landslides with poor soil conditions, the longer drainage holes are easily affected by the surrounding rock and soil and collapse, affecting slope drainage; 2) The drainage tunnel has a good drainage effect, but the water collection range is limited and the water seepage effect is good only within a range of several times the diameter of the tunnel. At the same time, the construction of the drainage tunnel is relatively difficult, and the construction location is strictly restricted. Being far or close to the sliding surface will affect the safety of the structure and the drainage efficiency.

[0003] 3) The water collection well can effectively drain the groundwater in the slope, but the water collection range of a single water collection well is small. Therefore, in order to increase the water collection range, a large number of water collection holes are required to extend around the water collection well. In addition, the length and diameter of the water collection holes are restricted by the terrain, which limits the expansion of the water collection range. At the same time, the location and depth of the water collection well need to be strictly controlled. If it is not set up properly, there will be no water to drain in some water collection wells; 4) Although the permeable cut-off wall pile is suitable for the treatment of large water-rich landslides, it is necessary to build a drainage tunnel on the periphery. The drainage of the tunnel is restricted by the terrain of the landslide area. The boundaries on both sides of the landslide must be low in terrain so that the drainage tunnel has an exit. In addition, the cut-off wall needs to be excavated manually, which is not only inefficient but also highly dangerous, making the construction more difficult and costly; 5) In the existing technology, the groundwater inside the landslide body is basically collected and directly discharged to the surface ditch, which not only has high overall cost, but also causes corresponding waste of groundwater resources. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides. Based on the characteristics of the longitudinal section of the landslide area being high at the back and low at the front, the present invention abandons the operation of building peripheral drainage tunnels in traditional operations, and adopts a combination of groundwater interception, infiltration and drainage, water collection and water diversion to form a network channel for three-dimensional interception and drainage of landslide groundwater, which can effectively reduce the groundwater level in the slope and achieve the purpose of anti-skid drainage control of large-scale water-rich landslides.

[0005] To achieve the above object, the present invention provides the following technical solutions: A pile-well-pipe combination system for preventing and controlling large water-rich landslides, comprising a water-cutting curtain structure arranged at the middle of the landslide and used to cut off the flow of groundwater, a water collection well located below the elevation of the water-cutting curtain structure, a downstream tunnel for conveying and discharging groundwater intercepted by the water-cutting curtain structure to the water collection well, and an upward-inclined drainage pipe for discharging water from the water collection well to the surface; The water-cutting curtain structure includes a seepage pipe pile group and anchor cable anti-slip piles closely arranged on both sides of the seepage pipe pile group. The seepage pipe pile group includes anchor cable permeable piles and seepage pipes closely and staggeredly arranged. There is a gap between the seepage pipe and the anchor cable permeable piles / anchor cable anti-slip piles. It is necessary to cast concrete water-cutting stones in the gap to close the gap. A drainage blind hole is provided at the bottom of the anchor cable permeable pile, and a seepage tunnel is provided at the bottom of the seepage pipe; the drainage blind hole and the seepage tunnel are connected to form a drainage channel and are connected to the downstream tunnel.

[0006] The water-cutting curtain composed of the anchor cable anti-slide pile, anchor cable permeable pile and seepage pipe is set somewhere in the middle of the landslide to cut off the groundwater flow in the entire section. At the same time, the seepage pipe infiltrates the groundwater into the seepage tunnel. After the groundwater is collected in the drainage channel, it is driven by gravity into the downstream tunnel and flows into the water collection well by taking advantage of the height difference of the landslide, and when the groundwater in the well is collected to the water inlet height of the inclined drainage pipe, the water flows to the peripheral surface drainage ditch through the drainage pipe.

[0007] The arrangement of the anchor anti-slip piles and the anchor permeable piles enables the water-cutting curtain structure to have stable anti-slip ability, which can not only bear the thrust of the landslide and prevent the slope from deforming to ensure the safety and stability of the water collection well below, but also the anchor anti-slip piles arranged on the sides can prevent the soil at the seepage tunnel from being eroded and gradually lost under the action of the penetration force of the water body, forming internal cavities, and causing the instability of the slope anti-slip foundation.

[0008] The drainage blind hole at the bottom of the anchor cable permeable pile is designed to cooperate with the adjacent seepage tunnel to form a drainage channel that is connected and can collect groundwater that seeps into the seepage tunnel from each seepage pipe.

[0009] Preferably, the blind drainage hole and the seepage tunnel are both arched channel structures cast or assembled by concrete, and the drainage channel has a slope structure with both ends higher than the node connecting the Shunshui tunnel. The slope structure design of the drainage channel with high ends and low nodes connecting the Shunshui tunnel facilitates the intercepted groundwater to enter the Shunshui tunnel smoothly, and at the same time, the height difference of the landslide is used to make the water in the Shunshui tunnel flow into the water collection well by gravity.

[0010] Preferably, the top of the seepage tunnel is open and connected and communicated with the inner wall of the seepage pipe through a water stop ring, and a concrete casting layer is used as a transition between the bottom end of the seepage pipe and the outer wall of the seepage tunnel; the arched hollow channel of the seepage tunnel is provided with a water inlet hole at the corresponding water stop ring, and a secondary crushed stone filling layer is provided above the water inlet hole.

[0011] The groundwater infiltrating the seepage pipe is filtered through the primary crushed stone filling layer, enters the seepage pipe and finally flows into the seepage tunnel. At the same time, in order to prevent the leakage of groundwater, the corresponding gaps are sealed by setting water stop rings and concrete pouring layers. The concrete pouring layer makes the seepage tunnel and the seepage pipe form an integral structure to ensure the bottom sealing of the water-cutting curtain structure.

[0012] Preferably, a plurality of longitudinal beams are provided at the opening of the seepage tunnel in the water stop ring. The provision of the longitudinal beams can alleviate the problem of excessive pressure at the top of the seepage tunnel.

[0013] Preferably, the seepage pipe is a precast concrete plum blossom pipe structure with a drainage hole, the seepage pipe is filled with a secondary crushed stone filling layer, and the drainage hole is opened at the pipe wall of the seepage pipe on the landslide side, and the pipe wall of the seepage pipe on the back slope side is closed and water-blocking. The groundwater intercepted by the water-cutting curtain enters the seepage pipe from the drainage hole, flows through the secondary crushed stone filling layer, and enters the seepage tunnel through the water inlet hole. The use of a precast concrete plum blossom pipe structure for the seepage pipe can improve its own structural strength. The secondary crushed stone filling arranged in the pipe can improve the overall deformation resistance of the seepage pipe on the one hand, and on the other hand, provide an axial seepage path on the basis of blocking soil loss, effectively reducing the continuous scouring force of the intercepted groundwater on the seepage tunnel.

[0014] Preferably, a filter layer is provided in the drainage hole to prevent soil from blocking the drainage hole and causing the drainage hole to fail.

[0015] Preferably, a primary crushed stone filling layer is provided at the outer wall of the seepage pipe on the slope side, and the graded crushed stone particle size of the secondary crushed stone filling layer is larger than the graded crushed stone particle size of the primary crushed stone filling layer.

[0016] Preferably, the downstream tunnel is a multi-layer lining underground tunnel structure that is inclined and extended relative to the horizontal plane. The downstream tunnel is an underground structure, and it is inconvenient to maintain it in the later stage. Therefore, a multi-layer lining design is adopted in the design, and a deeper and thicker corrosion-resistant concrete is poured at the bottom to cope with continuous scouring.

[0017] Preferably, the inner bottom wall of the downstream tunnel is a stepped waterfall structure. The stepped waterfall structure can play an energy dissipation role and greatly alleviate the problem of groundwater scouring the bottom of the tunnel.

[0018] Preferably, one side of the water collection well is connected to the downstream tunnel, and the other side is connected to the water inlets of multiple inclined drainage pipes. The multiple inclined drainage pipes are arranged sequentially along the height direction of the water collection well and are inclined with high water inlets and low water outlets. The water inlet of the lowest inclined drainage pipe is higher than the bottom of the well.

[0019] The groundwater flows to the water collection well through the downstream tunnel. When it gathers in the well to the height of the water inlet of the inclined drainage pipe, the water flows to the outer surface drainage ditch through the inclination of the inclined drainage pipe, so that the water in the water collection well always maintains a low liquid level, achieving the purpose of landslide drainage. The design of the lowest inclined drainage pipe inlet higher than the bottom of the well gives the groundwater in the water collection well a certain space for impurities to settle, preventing impurities from entering the inclined drainage pipe and causing blockage. At the same time, the groundwater finally discharged can be collected and purified for use as domestic or industrial water.

[0020] Compared with the prior art, the present invention has the following advantages: 1) The water-cutting curtain structure composed of the seepage pipe pile group and the anchor cable anti-slide pile can intercept the groundwater in the landslide in the whole section, with a wide water collection range and large water output. The seepage pipe enters the water from the slope side and the drainage hole does not need to extend outward. In addition, the anti-filtration layer and the first-level crushed stone filling layer can effectively prevent the drainage hole from being blocked; 2) The corresponding tunnel structure can be built together with the construction of pipe piles, without the need for additional excavation and support, thereby reducing the construction difficulty and cost; at the same time, the seepage pipe in the water cut-off curtain structure is constructed by drilling, and then prefabricated concrete plum blossom pipes are placed, which not only speeds up the construction speed but is also safer than manual digging; 3) The water-cutting curtain structure has a large water collection range and uses the low front and high back of the landslide to collect water into the water collection well, which solves the problem that traditional water collection wells can only drain water locally, resulting in water shortage in many water collection wells. In addition, the landslide thrust is borne by the anchor cable permeable piles and anchor cable anti-slide piles, so the water collection well is only affected by the lateral earth pressure, and there is no need to consider the setting direction and depth constraints, which greatly relaxes the design requirements of the water collection well; 4) A downstream tunnel is used to connect the water collection well and the drainage channel at the bottom of the water-cutting curtain structure, making full use of the terrain advantage of the decreasing landslide height to facilitate drainage. In addition, compared with the traditional peripheral drainage structure, the downstream tunnel is not restricted by the terrain on both sides of the landslide and is suitable for drainage operations in most landslide terrains; 5) The combination of the inclined drainage pipe and the water collection well can provide a stable water source for the inclined drainage pipe. At the same time, the terrain height difference is utilized to truly realize the rapid, stable and automatic discharge of landslide groundwater, thereby improving the utilization efficiency of the inclined drainage pipe; 6) This application can effectively and fully collect a large amount of groundwater, and carry out upward drainage in coordination with the planning on the ground, so that the groundwater can be concentrated for commercial use; 7) The overall structure of this application is located underground and will not occupy the landslide surface, so the landslide surface soil can be used for farming or maintained in its original state to achieve the effect of environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a plan view of the anti-slip drainage treatment system applied to landslides in the specific implementation method; Figure 2 It is a side view structural diagram of the anti-skid drainage management system in a landslide according to a specific implementation method; Figure 3 It is a schematic diagram of the front view structure of the anti-skid drainage management system in the landslide according to the specific implementation method; Figure 4 It is a schematic diagram of the connection structure of the seepage pipe and the anchor cable permeable pile in a top view according to the specific implementation method; Figure 5 It is a structural schematic diagram of the seepage pipe and the seepage tunnel described in the specific implementation method; Figure 6 A schematic diagram of the vertical cross-sectional structure of the water corridor according to the specific implementation method DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] like Figure 1-6 As shown, a pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides includes a water-cutting curtain structure 1 arranged at the middle of the landslide and used to cut off the flow of groundwater, a water collection well 2 located below the elevation of the water-cutting curtain structure 1, a downstream tunnel 3 for conveying and discharging groundwater intercepted by the water-cutting curtain structure to the water collection well, and an upward-inclined drainage pipe 4 for discharging water from the water collection well to a surface drainage ditch 9; The downstream tunnel 3 is a multi-layer lining underground tunnel structure extending and tilted relative to the horizontal plane, and the inner bottom wall of the downstream tunnel 3 is a stepped waterfall structure 31. One side of the water collection well 2 is connected to the downstream tunnel 3, and the other side is connected to the water inlet of multiple inclined drainage pipes 4. Multiple inclined drainage pipes 4 are arranged in sequence along the height direction of the water collection well and are arranged in an inclined shape with a high water inlet and a low water outlet. The water inlet of the lowest inclined drainage pipe 4 is higher than the bottom surface of the well.

[0024] The water-cutting curtain structure 1 includes a seepage pipe pile group 11 and anchor cable anti-slip piles 12 closely arranged on both sides of the seepage pipe pile group 11. The seepage pipe pile group 11 includes anchor cable permeable piles 13 and seepage pipes 14 closely and staggeredly arranged. A drainage blind hole 15 is provided at the bottom of the anchor cable permeable pile 13, and a seepage tunnel 16 is provided at the bottom of the seepage pipe 14. The gap between the seepage pipe 14 and the anchor cable permeable pile 13 or the anchor cable anti-slip pile 12 is closed by a water-cutting stone 17.

[0025] The blind drainage hole 15 and the seepage tunnel 16 are connected to form a drainage channel and are connected to the downstream tunnel 3. The drainage channel is a slope structure with both ends higher than the nodes connected to the downstream tunnel 3. The blind drainage hole 15 and the seepage tunnel 16 are both arched channel structures formed by concrete pouring or assembling, wherein the top of the seepage tunnel 16 is open and connected and connected to the inner wall of the seepage pipe 14 through the water stop ring 5, and the bottom end of the seepage pipe 14 and the outer wall of the seepage tunnel 16 are transitioned by a concrete pouring layer, and a number of longitudinal beams 6 are also provided at the opening of the seepage tunnel in the water stop ring 5; the arched hollow channel of the seepage tunnel 16 is provided with a water inlet hole 18 at the corresponding water stop ring, and a secondary gravel filling layer 8 is provided above the water inlet hole 18.

[0026] The seepage pipe 14 is a prefabricated concrete plum blossom pipe structure of a certain thickness and with a drainage hole 19. The seepage pipe 14 is filled with a secondary crushed stone filling layer 8, and the drainage hole 19 is opened at the pipe wall of the seepage pipe 14 on the side close to the landslide. The pipe wall of the seepage pipe 14 on the back slope side is closed and water-blocking, and a filter layer is arranged inside the drainage hole 14. A primary crushed stone filling layer 7 is arranged on the outer wall of the seepage pipe 14 on the slope side, and the graded crushed stone particle size of the secondary crushed stone filling layer 8 is larger than the graded crushed stone particle size of the primary crushed stone filling layer 7.

[0027] The solution recorded in this embodiment has been confidentially applied to a landslide prevention project in Yonghe Township, Jiuzhaigou County, Sichuan Province. The landslide is about 150m long in the longitudinal direction, 247° in the main sliding direction, about 250m in the transverse width, 3.4×104㎡ in area, about 25m in average thickness, and about 85×104m in volume. 3 The groundwater level in the landslide area is high, and the landslide area has a high frequency of heavy rainfall and heavy rainfall. Once the landslide revives, the number of people at risk will be as high as 1,310, and the possible economic loss may be about 25 million yuan.

[0028] In the specific construction, the corresponding structural parameters are as follows: 1) The anchor cable permeable pile body is cast with C30 concrete, and an anchor cable is set on the top to improve the stress condition of the pile body. The anchor cable is made of 12 φ15.2 prestressed steel strands with an inclination of 20°. The cross-sectional size of the pile body is 2.5m×3.5m, and the thickness of the arm guard is 30cm; The drainage blind hole has a net height of 2.0m, a net width of 1.2m, and a top curved radius of 0.6m. It is set at a distance of no less than 2m from the bottom of the pile. The bottom is poured with 30cm thick C20 concrete. The pile length is controlled by the ground elevation and the slope of the bottom drainage blind hole.

[0029] 2) The seepage pipe adopts a 5cm thick special prefabricated concrete plum blossom culvert, which is filled with graded crushed stone with a particle size of 30-500mm (i.e. the secondary crushed stone filling layer). A drainage hole with a diameter of D90 is set in the pipe. The drainage pipe connected to the drainage hole is designed with a nut. The hole mouth is inclined inward by 5°. Four holes are set at the same height with a vertical interval of 1m. The outer periphery of the seepage pipe on the slope side and the seepage tunnel below are filled with crushed stone with a particle size of 20-50mm (i.e. the primary crushed stone filling layer).

[0030] 3) The water stop ring is 20cm thick and 35cm high. Three longitudinal beams with a height of 35cm and a width of 30cm are arranged inside the seepage tunnel. The specific length of the longitudinal beams varies with the position.

[0031] 4) The seepage tunnel is built with C25 precast reinforced concrete blocks to build an arched passage and is formed by external cement pouring. The internal net size is the same as the drainage blind hole. A water inlet hole is set on the top of the precast block. The overall vertical wall is 30 cm thick. The arch wall has a variable section with a thickness of 30cm-50cm, of which the arch top is 50cm thick.

[0032] 5) If there is a gap between the seepage pipe and the anchor permeable pile / anchor anti-slide pile, it is necessary to use C20 concrete to cast a 30cm thick water cutoff stone in the gap to close the gap.

[0033] 6) The drainage tunnel has a net height of 2.0m, a net width of 1.2m, a top curved surface radius of 0.6m, and a stepped waterfall at the bottom. The waterfall platform is 30cm high, 50cm wide, 20m long, and the overall ditch slope is 31°.

[0034] The top of the downstream tunnel is vertically connected to the drainage channel composed of the seepage tunnel and the drainage blind hole. The slope of the bottom of the drainage blind hole and the seepage tunnel is set to 5°. In the cross section, the water flows from the drainage channels on both sides of the landslide body to the downstream tunnel in the middle of the landslide. The bottom of the downstream tunnel is connected to the water collection well.

[0035] 7) The inner diameter of the water collection well is 3.6m, the well wall 2m above the sliding surface is mortar-laid, and the rest of the well wall below the sliding surface is dry-laid. The inclined drainage pipe is a stainless steel pipe with an inner diameter of 110mm. The groundwater flows to the water collection well through the downstream tunnel. When it gathers in the well to the water inlet height of the inclined drainage pipe, the water flows through the inclined drainage pipe to the outer surface drainage ditch or other structures to be introduced into the water plant for filtration and purification before being sold.

[0036] The specific implementation process is as follows: The system is arranged at an appropriate location on the landslide body. First, the anchor cable permeable pile is constructed: the skip pile method is used for excavation, and C25 concrete arm supports are configured around the excavation area. The single height of the retaining wall is determined according to the maximum excavation depth at one time. Generally, one section of the retaining wall is provided every 1m-1.5m. The excavation is continued to the predetermined elevation of the pile body, and the bottom is paved with mortar of the same grade and thickness of 10-20cm as the concrete to reduce water seepage in the well and keep it clean. After that, the steel cage is hoisted and the concrete at the bottom of the pile is poured to the bottom of the drainage blind hole. The steel formwork is erected and the concrete is carefully poured until it is about 2m away from the drainage blind hole. After the concrete has a certain strength, the concrete pouring construction can continue to prevent the steel formwork from being damaged and causing the hole to fail. After the concrete is poured to the anchor cable position in the pile, the anchor cable hole is reserved, and the concrete is continued to be poured until the top of the pile. After the pile body concrete reaches the predetermined strength, the anchor cable prestressing is applied.

[0037] After all adjacent anchor cable permeable piles are completed, the seepage pipe construction between the anchor cable permeable piles is carried out: first, a drilling rig is used to drill holes to a predetermined depth, a pump is used to pump water and dig out the rock and soil at the water cut-off stone, then concrete is sprayed as a short-term anti-seepage structure, and then the concrete of the water cut-off stone is poured. When the concrete template is removed without deformation, the seepage pipe is installed. The seepage pipe has prefabricated drainage holes and the drainage holes are designed with nuts. The nuts are opened from bottom to top, and a small machine is used to drill through the holes to spray the concrete seepage layer, and the drainage hole filter layer is installed. At the same time, a pump is set in the well to maintain a low water level in the well. After all drainage holes are opened, the nuts are tightened, and a first-level crushed stone filling layer is filled on the outside of the seepage pipe. Then continue to dig downward to the predetermined elevation, open the channel with the anchor cable permeable pile, remove the steel template and hoist it to the ground. Install the bottom steel cage and pour the bottom concrete. After that, the arched channel of the seepage tunnel is assembled and the external concrete is poured. After a certain period of time, the arched channel is filled with a secondary crushed stone filling layer. After that, the water stop ring is installed and the concrete at the water stop ring is poured. After it has a certain strength, the prefabricated longitudinal beam is installed inside the water stop ring. At this time, the construction of the seepage pipe is stopped. Note that the seepage tunnel connected to the downstream tunnel is built with prefabricated blocks to facilitate subsequent opening.

[0038] The construction of the water collection well and the downstream tunnel is carried out simultaneously with the anchor cable permeable piles. Mechanical and manual excavation is adopted, and concrete wall support is used. After the upper wall of the water collection well is dry-laid, steel mesh is added according to the depth to prevent the well wall from collapsing. After excavation to the elevation of the bottom of the well, the downstream tunnel interface is retained, and concrete is poured at the bottom to prevent the interception of groundwater from seeping. When the concrete has a certain strength, the construction of the inclined drainage hole pipe is carried out. The drainage hole is drilled on the outside of the slope with a drilling rig. Steel casing is arranged outside the borehole to follow up the drilling to prevent the hole from collapsing. After drilling to the water collection well, the inclined drainage pipe is installed, the steel casing is pulled out, and an anti-filtration layer is set at the water inlet. When the inclined drainage hole is constructed, the downstream tunnel is constructed at the same time.

[0039] The bottom of Shunshui Tunnel is paved with C20 concrete with a thickness of 50cm. After excavation, anchor spraying support is carried out in time. I12.6 I-beam steel frame arch, steel mesh and sprayed concrete are used as the primary lining. 32 φ22 drug roll anchor rods are implemented before and after the arch to prevent tunnel collapse. C30 reinforced concrete material is used for the secondary lining. Shunshui Tunnel continues to be excavated until it is connected to the drainage channel. The seepage tunnel corresponding to Shunshui Tunnel and the drainage channel is opened to achieve structural connection. After that, the secondary crushed stone filling layer is filled in the seepage pipe and the nuts of the drainage holes are removed. At this point, the construction of this system is completed.

Claims

1. A pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides, characterized in that: It includes a water-cutting curtain structure set in the middle of the landslide to cut off the flow of groundwater, a water collection well located below the elevation of the water-cutting curtain structure, a downstream tunnel for conveying and discharging the groundwater intercepted by the water-cutting curtain structure to the water collection well, and an inclined drainage pipe for discharging the water from the water collection well to the surface; The water-cutting curtain structure includes a seepage pipe pile group and anchor cable anti-sliding piles closely arranged on both sides of the seepage pipe pile group. The seepage pipe pile group includes anchor cable permeable piles and seepage pipes closely and staggeredly arranged. A drainage blind hole is provided at the bottom of the anchor cable permeable pile, and a seepage tunnel is provided at the bottom of the seepage pipe. The drainage blind hole and the seepage tunnel are connected to form a drainage channel and are connected to the downstream tunnel.

2. The pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides according to claim 1, characterized in that: The blind drainage hole and the seepage tunnel are both arched channel structures formed by concrete pouring or assembling, and the drainage channel has a slope structure with both ends higher than the nodes connecting the downstream tunnel.

3. The pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides as claimed in claim 2, characterized in that: The top of the seepage tunnel is open and connected and communicated with the inner wall of the seepage pipe through a water stop ring, and a concrete pouring layer is used as a transition between the bottom end of the seepage pipe and the outer wall of the seepage tunnel; The arched hollow passage of the water seepage tunnel is provided with a water inlet hole at a position corresponding to the water stop ring, and a secondary crushed stone filling layer is provided above the water inlet hole.

4. The pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides as claimed in claim 3, characterized in that: A plurality of longitudinal beams are also arranged at the opening of the seepage tunnel in the water stop ring.

5. The pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides as claimed in claim 3, characterized in that: The seepage pipe is a prefabricated concrete plum blossom pipe structure with a drainage hole. The seepage pipe is filled with a secondary crushed stone filling layer. The drainage hole is opened at the pipe wall of the seepage pipe on the side close to the landslide, and the pipe wall of the seepage pipe on the back slope side is closed to block water.

6. The pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides as claimed in claim 5, characterized in that: A reverse filter layer is arranged in the drain hole.

7. The pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides as claimed in claim 5, characterized in that: A primary crushed stone filling layer is arranged at the outer wall of the seepage pipe on the slope side, and the graded crushed stone particle size of the secondary crushed stone filling layer is larger than the graded crushed stone particle size of the primary crushed stone filling layer.

8. The pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides according to claim 1, characterized in that: The downstream tunnel is a multi-layered lining underground tunnel structure that extends obliquely relative to a horizontal plane.

9. The pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides as claimed in claim 8, characterized in that: The inner bottom wall of the downstream tunnel is a stepped waterfall structure.

10. The pile-well-pipe combination system for preventing and controlling large-scale water-rich landslides according to claim 1, characterized in that: One side of the water collection well is connected to the downstream tunnel, and the other side is connected to the water inlets of multiple inclined drainage pipes. The multiple inclined drainage pipes are arranged sequentially along the height direction of the water collection well and are inclined with high water inlets and low water outlets. The water inlet of the lowest inclined drainage pipe is higher than the bottom of the well.

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