Landslide mass fixing device and method based on irrigation and drainage integration

Abstract

The invention discloses a landslide body fixing device and method based on irrigation and drainage integration, belongs to the field of disaster prevention and reduction, and discloses the landslide body fixing device based on irrigation and drainage integration. The improved irrigation and drainage integrated device for the hillside comprises deep piles, an emergency drainage and irrigation device and an irrigation area, the irrigation and drainage integrated device is fixed through the deep piles, and stable support is provided for a landslide body; the water content of the landslide mass during strong rainstorm is reduced through the emergency drainage irrigation device, and the starting probability of the landslide mass is reduced; green plants in the irrigation area are cultivated through the emergency drainage irrigation device, and the stability of the landslide mass is further enhanced. The irrigation and drainage integrated device is adopted to stabilize and reinforce the landslide mass, emergency drainage can be conducted on the landslide mass in rainstorm, meanwhile, the landslide mass is reinforced through the deep piles and the green plants, and the stability of the landslide mass is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the field of disaster prevention and reduction, in particular to a novel slope stabilization technology, and more particularly to a landslide body fixing device and method based on integrated irrigation and drainage. Background Art

[0002] Traditional landslide prevention and control methods primarily utilize rigid protective structures such as anti-slide piles, retaining walls, and surface drainage ditches. While these methods can provide short-term mechanical support, they exhibit significant drawbacks under extreme rainstorm conditions: rigid structures struggle to adapt to the changes in seepage pressure caused by a sudden increase in soil moisture content, and drainage systems are susceptible to siltation and failure, leading to a sharp decline in slope stability. Recently developed ecological slope protection technologies, while reinforcing the soil through plant roots, lack an emergency mechanism for actively regulating moisture content. This prevents rapid removal of saturated water during the initial stages of heavy rainfall, creating the risk of delayed landslide initiation. Existing irrigation and drainage facilities generally utilize a separate design, lacking a coordinated mechanism between the irrigation system and drainage channels. This results in water waste during the rainy season and makes it difficult to maintain the vegetation's slope-stabilizing effect during the dry season. More critically, conventional deep pile structures provide only passive anti-slide forces without coupling with hydrological control systems, resulting in a functional disconnect between engineering and ecological measures. At present, there is an urgent need for a composite landslide control system that can integrate hydrological regulation, structural reinforcement and ecological protection to achieve rapid drainage response under heavy rain conditions and synergistic efficiency of soil and water conservation under normal conditions.

[0003] To address the above issues, the present invention aims to propose a device and method for securing landslides based on an integrated irrigation and drainage system. Deep piles are used to secure the integrated irrigation and drainage system, providing stable support for the landslide. Emergency drainage and irrigation systems are used to reduce the moisture content of the landslide during heavy rainstorms, thereby reducing the chance of the landslide initiating. Furthermore, the emergency drainage and irrigation system is used to cultivate greenery in the irrigation area, further enhancing the stability of the landslide. This invention utilizes an integrated irrigation and drainage system to stabilize and reinforce the landslide, enabling emergency drainage of the landslide during heavy rainstorms. Deep piles and greenery are also used to reinforce the landslide, significantly improving its stability.

[0004] After review, it is found that very few of the published patents involve landslide fixation methods based on integrated irrigation and drainage. Some of the patents related to landslide fixation methods are as follows:

[0005] CN119287941A discloses a soil-covering and grass-planting protective structure suitable for rocky road cutting slopes and its construction method, which can ensure the stability and greening effect of the greening structure on the high slopes of siltstone road cuttings. However, this method has a low degree of automation and does not provide short-term deep reinforcement of the landslide body.

[0006] CN116479921B discloses an expansive soil embankment drainage structure and its construction method, which takes into account the functions of vacuum drainage, anti-seepage and moisture retention, heap load de-swelling and ecological protection. However, this method lacks the function of utilizing the water content of the slope for vegetation irrigation.

[0007] CN116411612A discloses a siphon drainage system and method for slope drainage and automatic irrigation of green plants. The system can utilize the water level difference to draw the water in the reservoir into the irrigation pipe and automatically irrigate the green plants on the slope surface, thereby achieving the purpose of reducing labor intensity and protecting water resources. However, this method places the reservoir at the foot of the slope, which requires more energy to irrigate vegetation on higher slopes, making it difficult to achieve distributed irrigation. Summary of the Invention

[0008] In view of the above-mentioned problems that the existing irrigation system and drainage channel lack a coordinated working mechanism and are difficult to cope with extreme rainstorm conditions, a landslide fixing device and method based on integrated irrigation and drainage is provided, which can greatly improve the stability of the landslide.

[0009] The present invention provides a landslide body fixing device based on integrated irrigation and drainage, characterized in that the integrated irrigation and drainage device comprises deep piles, emergency drainage irrigation devices and irrigation areas.

[0010] Furthermore, the deep piles are arranged at the bottom of the emergency drainage and irrigation device, and the irrigation area is set in the upper layer of the soil in the area where the emergency drainage and irrigation device is arranged.

[0011] Furthermore, the deep pile includes a pile head, a withdrawal stopper in the first pile cavity, a pile head water seepage hole, a pile head end, a pile head rubber ring accommodating cavity, a segmented pile body, an anti-collision rubber pad, an integrated rubber ring, a pile body water seepage hole, a withdrawal stopper in the second pile cavity and a segmented pile body rubber ring accommodating cavity.

[0012] Preferably, the deep pile is set as a cavity, but for slopes with relatively hard soil or where the pile body needs to be buried at a greater depth, the pile head can also be filled with cement or a solid pile head can be used.

[0013] Preferably, when processing gravel-containing formations, a diamond drill bit insert can be added to the end of the pile head.

[0014] Preferably, in a corrosive soil environment, the segmented pile body should adopt a composite structure of 304 stainless steel and HDPE, and its wall thickness can increase by 0.5-1.2 mm with the gradient of burial depth.

[0015] Furthermore, the pile head water seepage hole is located above the end of the pile head, and the pile head rubber ring accommodating cavity and the withdrawal bayonet in the pile cavity are arranged adjacent to each other up and down.

[0016] Furthermore, the segmented pile body is inserted into the pile head from above, the anti-collision rubber pad abuts against the surface of the retreat stopper in the first pile cavity, and the integrated rubber ring is clamped inside the segmented pile body rubber ring accommodating cavity.

[0017] Preferably, in the case of an extremely unstable slope, the integrated rubber ring may be replaced with a steel ring or a double rubber ring may be used, and a steel hoop may be provided on the outside of the device to fix the interface.

[0018] Preferably, wedge-shaped engaging teeth are provided on the inner wall of the steel ferrule, and a pre-tightening force is applied axially to the ferrule.

[0019] Preferably, for earthquake-prone areas, X-shaped cross damping links can be added between adjacent segmented piles, and the distance between the links is controlled within the range of 2-3 times the pile diameter.

[0020] Furthermore, the segmented pile body is configured as a cavity, the pile body water seepage hole is located above the integrated rubber ring, and the segmented pile body rubber ring accommodating cavity and the retreat bayonet in the second pile cavity are arranged adjacent to each other up and down.

[0021] Furthermore, the emergency drainage irrigation device includes a water collection well, a main well body and a slope well body.

[0022] Furthermore, the water collection well is arranged on the top of the soil body and connected to the main well body, and the slope well body is arranged on the slope surface of the soil body and connected to the main well body at the top.

[0023] Preferably, the buried depth of the water collection well does not exceed 0.5 meters, the filter well cover is at the same height as the soil surface, and the buried depth of the main well body does not exceed 1.5 meters.

[0024] Preferably, for silty clay slopes, the porosity of the filter manhole cover should be ≥35% and be equipped with a double-layer stainless steel filter (80 / 120 mesh composite structure).

[0025] Preferably, in permafrost areas, a 10-15 mm thick polyurethane insulation layer should be provided on the side walls of the main well, and its burial depth should be greater than 0.3 m above the lower limit of the local permafrost layer.

[0026] Furthermore, the water collection well includes a filter well cover and a water collection well seepage hole. The main well body includes a main well cover, a pumping rod, a one-way partition, a main well body lateral seepage hole, a main well body anti-collision rubber pad, a main well body integrated rubber ring, a main well body lateral seepage hole and a main well body irrigation bin.

[0027] Preferably, the main well body is formed by inserting segmented piles from above, but in areas where the soil is relatively stable, the bottom of the well body can also be sealed and a cement cushion layer can be laid at the bottom.

[0028] As a preference, the cement cushion layer should be made of C30 concrete mixed with 0.6% polypropylene fiber, and the thickness should be controlled at 0.1 times the pile diameter; when encountering a groundwater level fluctuation zone, a check drain valve group should be added at the bottom.

[0029] Furthermore, the slope well body also includes a first lifting pressure casing, a second lifting pressure casing, a third lifting pressure casing and a nozzle.

[0030] Furthermore, the first pressure-raising casing is sleeved on the outside of the second pressure-raising casing, the second pressure-raising casing is sleeved on the outside of the third pressure-raising casing, and the nozzle is connected to the third pressure-raising casing.

[0031] A landslide fixing method based on an integrated irrigation and drainage device, characterized in that the method comprises the following steps:

[0032] S1: driving deep piles into the landslide surface;

[0033] S2: burying the water collection well and main well at the top of the landslide;

[0034] S3: burying slope wells on the surface of the landslide;

[0035] S4: Plant greenery in the irrigated area on the landslide surface.

[0036] Preferably, step S1 further includes: driving deep piles below the landslide surface and connecting several segmented pile bodies; a hydraulic synchronous jacking system should be used during pile connection construction, and the axis deviation of adjacent pile segments should be less than 1°; for slopes containing weak interlayers, bentonite slurry can be poured into the pile cavity.

[0037] Preferably, step S3 and step S4 also include: the irrigation range of the slope well body should fully cover the green plants in the irrigation area, and the lifting pressure casing of the slope well body can adjust the irrigation water output according to the changes in the water pressure in the pipe; the irrigation system should be equipped with a soil moisture sensor linkage control module, which automatically starts the drip irrigation mode when the surface soil moisture content is lower than 18%, and switches to the pulse spray mode when it is higher than 30%.

[0038] Compared with the prior art, the advantages and positive effects of the present invention are:

[0039] The integrated coupling design of deep piles and emergency drainage and irrigation systems achieves a synergistic effect between mechanical reinforcement and hydrological regulation. The segmented internal cavity structure of the piles, combined with a gradient seepage hole layout, not only enhances the pile's shear strength but also forms a three-dimensional drainage network, shortening the response time for slope moisture content control. This integrated landslide prevention and control system, combining rigid reinforcement, flexible drainage, and ecological restoration, significantly reduces project costs and the probability of landslides compared to traditional rigid structural solutions. It provides a comprehensive solution for slope management in complex geological conditions, combining immediate rescue and long-term protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] Figure 1 A schematic diagram of a landslide fixing device and method based on integrated irrigation and drainage provided in Example 1;

[0042] Figure 2 A schematic diagram of a deep pile of a landslide body fixing device based on integrated irrigation and drainage provided in Example 1;

[0043] Figure 3 A schematic diagram of a water collection well and a main well body of a landslide body fixing device based on integrated irrigation and drainage provided in Example 1;

[0044] Figure 4 A schematic diagram of a slope well body of a landslide body fixing device based on integrated irrigation and drainage provided in Example 1;

[0045] In the above figures, 1, deep pile; 11, pile head; 12, stopper in the first pile cavity; 13, seepage hole in the pile head; 14, end of the pile head; 15, pile head rubber ring receiving cavity; 16, segmented pile body; 17, anti-collision rubber pad; 18, integrated rubber ring; 19, seepage hole in the pile body; 110, stopper in the second pile cavity; 111, segmented pile body rubber ring receiving cavity; 111, segmented pile body rubber ring receiving cavity; 2, emergency drainage and irrigation device; 21, filter manhole cover; 22, water collection well; 2 3. Seepage hole of water collection well; 24. Main well cover; 25. Pumping rod; 26. One-way partition; 27. Lateral seepage hole of main well body; 28. Anti-collision rubber pad of main well body; 29. Integrated rubber ring of main well body; 210. Main well body; 211. Lateral seepage hole of main well body; 212. Irrigation chamber of main well body; 213. First lifting pressure casing; 214. Second lifting pressure casing; 215. Third lifting pressure casing; 216. Sprinkler; 217. Slope well body; 3. Irrigation area; 4. Soil. DETAILED DESCRIPTION

[0046] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other in the absence of conflict.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0048] Example 1: This example aims to implement the collaborative installation process of the deep pile (1) and the emergency drainage irrigation device (2). During the installation process, the following steps need to be followed to ensure the correctness of the installation:

[0049] 1. Assembly of deep pile (1): Align the pile head end (14) of the pile head (11) with the predetermined point and hammer it into the soil layer with a hydraulic hammer until the first pile cavity stopper (12) is exposed to the ground. Insert the segmented pile body (16) into the pile head (11), and the anti-collision rubber pad (17) is pressed against the surface of the first pile cavity stopper (12). The integrated rubber ring (18) is embedded in the segmented pile body rubber ring accommodating cavity (111). Repeat the pile connection, and the second pile cavity stopper (110) is connected to the upper pile body. The pile body seepage hole (19) and the pile head seepage hole (13) form a continuous drainage channel.

[0050] 2. Layout of emergency drainage and irrigation device (2): dig a water collection well (22) at the top of the landslide, install a filter well cover (21) with a water collection well seepage hole (23), and ensure that it is connected to the main well body (210) through a flange. The main well body (210) is inserted into the cavity of the deep pile (1), and the main well body anti-collision rubber pad (28) fits the inner wall of the pile body. The main well body integrated rubber ring (29) seals the interface. The slope well body (217) is laid along the slope surface, and the first lifting pressure casing (213) is connected to the second lifting pressure casing (214), and the end is connected to the third lifting pressure casing (215) and the nozzle (216).

[0051] 3. Drainage conditions: Rainwater is discharged through the pile head seepage hole (13) → pile body seepage hole (19) → main well body lateral seepage hole (27) → main well body (210) → water collection well (22).

[0052] 4. Irrigation working condition: The water stored in the main well irrigation tank (212) is sprayed out through the main well transverse seepage hole (211) → the slope well (217) → the nozzle (216).

[0053] Example 2: This example aims to implement the device response under extreme rainfall. During the execution process, it is necessary to follow the following steps to ensure the correctness of the execution:

[0054] 1. Activation of the drainage function: Rainwater enters the water collection well (22) through the filter manhole cover (21) and is initially filtered through the water collection well seepage holes (23). The pumping rod (25) in the main well body (210) is activated, and the one-way partition (26) prevents backflow. Water flows through the lateral seepage holes (27) of the main well body and is introduced into the drainage network. Inside the deep pile (1): Seepage water flows from the pile head seepage holes (13) → pile body seepage holes (19) → main well body (210) → water collection well (22), forming a three-dimensional drainage system.

[0055] 2. Structural stability assurance: The cavity structure of the segmented pile body (16) forms a continuous support through the pile head rubber ring accommodating cavity (15) and the segmented pile body rubber ring accommodating cavity (111). The steel hoop (label not provided, deleted as original) is replaced with the main well body anti-collision rubber pad (28) for adjusting the preload force to ensure the interface sealing.

[0056] Example 3: This example aims to implement the construction process of the integrated irrigation and drainage device in silty clay slopes. During the construction process, the following steps need to be followed to ensure the correctness of the construction:

[0057] 1. Pile preparation: A segmented pile body (16) composite structure is selected, the pile head (11) is made of a composite material of 304 stainless steel and HDPE (wall thickness gradient: 6 mm at the upper part and 8 mm at the lower part), and a diamond drill bit insert (suitable for gravel-containing interlayers) is pre-installed at the pile head end (14).

[0058] 2. Positioning and Construction: Use a GPS locator to determine the location of deep piles (1). The top of the slope is laid out at a 3D spacing (D = 0.6m), and the foot of the slope is increased to a 2D spacing. Use a hydraulic synchronous jacking system (synchronization accuracy ± 0.5mm) to drive the pile head (11) 2.5m below the landslide surface.

[0059] 3. Pile connection operation: Insert the second segmented pile body (16) into the pile head (11) through the retraction bayonet (12) in the first pile cavity. Pre-coat the contact surface between the anti-collision rubber pad (17) and the retraction bayonet with molybdenum disulfide lubricant (friction coefficient 0.09). Check the compression of the integrated rubber ring (18) in the segmented pile body rubber ring accommodating cavity (111) (control it within the range of 25%-30%). Repeat the pile connection until the designed depth of 8m is reached and the total axis deviation is less than 0.8°.

[0060] 4. Cavity treatment: Pour bentonite slurry (water-cement ratio 1:1, grouting pressure 0.3 MPa) into the pile cavity. After the grouting is completed, seal the pile seepage holes (19).

[0061] Example 4: This example aims to implement the configuration process of the emergency drainage irrigation device (2) in frozen soil areas. During the configuration process, the following steps need to be followed to ensure the correctness of the construction:

[0062] 1. Construction of the water collection well (22): A foundation pit with a diameter of 1.2m and a depth of 0.45m was excavated, and a filter well cover (21) equipped with an 80 / 120 mesh composite filter was installed. A 15mm thick polyurethane insulation layer was installed on the sidewalls of the water collection well, and the burial depth extended to the lower limit of the permafrost layer of 0.35m.

[0063] 2. Optimization of the main well body (210): The transverse seepage holes (211) of the main well body use a shape memory alloy filter (nickel-titanium alloy), with a pore diameter of 3 mm at room temperature, which shrinks to 1.2 mm at temperatures ≤ 5°C. A C30 polypropylene fiber concrete cushion is laid on the bottom, and a check valve group is installed.

[0064] 3. Slope well body (217) debugging: connect the third lifting pressure casing (215) to the sprinkler (216), install a moisture content sensor, start the drip irrigation mode when the surface soil moisture content drops to 18%, and switch to the pulse spray mode when it is higher than 30%.

[0065] Example 5: This example aims to implement the green plant maintenance process in the irrigation area (3). During the implementation process, the following steps need to be followed to ensure the correctness of the implementation:

[0066] 1. Irrigation system startup: Water is stored in the irrigation chamber (212) of the main well (210) and enters the slope well (217) through the transverse seepage holes (211) of the main well. The lifting pressure casing (213 / 214 / 215) expands and contracts according to the water pressure, adjusting the water output of the sprinkler (216): when the pressure is low, the third lifting pressure casing (215) extends, starting the drip irrigation mode; when the pressure is high, the casing contracts, switching to the spray mode.

[0067] 2. Deep piles (1) assist in slope stabilization: The grid structure formed by the pile head (11) and the segmented pile body (16) provides shear resistance support for the topsoil in the irrigation area (3). Seepage holes (13 / 19) reverse water flow during the dry season to maintain a moisture content of >20% in the roots of green plants.

Claims

1. A landslide fixing device based on integrated irrigation and drainage, characterized in that: The integrated irrigation and drainage device comprises a deep pile (1), an emergency drainage and irrigation device (2), and an irrigation area (3); the deep pile (1) is arranged at the bottom of the emergency drainage and irrigation device (2); and the irrigation area (3) is arranged in the upper layer of the soil (4) in the area where the emergency drainage and irrigation device (2) is arranged. The deep pile (1) comprises a pile head (11), a first pile cavity inner stopper (12), a pile head water seepage hole (13), a pile head end portion (14), a pile head rubber ring accommodating cavity (15), a segmented pile body (16), an anti-collision rubber pad (17), an integrated rubber ring (18), a pile body water seepage hole (19), a second pile cavity inner stopper (110) and a segmented pile body rubber ring accommodating cavity (111). The deep pile (1) is configured as a cavity, the pile head water seepage hole (13) is located above the pile head end portion (14), the pile head rubber ring accommodating cavity (15) and the pile cavity inner stopper (12) are arranged adjacent to each other in the upper and lower directions. The segmented pile body (16) is inserted into the pile head (11) from above, the anti-collision rubber pad (17) abuts against the surface of the first pile cavity inner stopper (12), and the integrated rubber ring (18) is stuck in the segmented pile body rubber ring accommodating cavity (111). The segmented pile body (16) is set as a cavity, the pile body water seepage hole (19) is located above the integrated rubber ring (18), and the segmented pile body rubber ring accommodating cavity (111) and the second pile cavity inner stopper (110) are arranged adjacent to each other. The emergency drainage irrigation device (2) includes a water collection well (22), a main well body (210) and a slope well body (217). The water collection well is arranged at the top of the soil body (4) and is connected to the main well body (210). The slope well body (217) is arranged on the slope of the soil body (4) and is connected to the main well body (210) at the top. The water collection well (22) includes a filter well cover (21) and a water collection well seepage hole (23). The main well body (210) includes a main well cover (24), a pumping rod (25), a one-way partition (26), a main well body lateral seepage hole (27), a main well body anti-collision rubber pad (28), a main well body integrated rubber ring (29), a main well body lateral seepage hole (211) and a main well body irrigation bin (212). The main well body (210) is inserted from above by a segmented pile body (16). The slope well body (217) further comprises a first lifting pressure casing (213), a second lifting pressure casing (214), a third lifting pressure casing (215) and a nozzle (216). The first lifting pressure casing (213) is sleeved on the outside of the second lifting pressure casing (214), the second lifting pressure casing (214) is sleeved on the outside of the third lifting pressure casing (215), and the nozzle (216) is connected to the third lifting pressure casing (215).

2. A landslide fixing method based on an integrated irrigation and drainage device, characterized in that: The method comprises the following steps: S1: driving deep piles (1) into the surface of the landslide; S2: burying a water collection well (22) and a main well body (210) at the top of the landslide body; S3: burying a slope well (217) on the surface of the landslide body; S4: Plant greenery in the irrigated area (3) on the surface of the landslide.

3. The landslide fixing method based on the integrated irrigation and drainage device according to claim 2 is characterized in that: The step S1 further comprises: driving a deep pile (1) below the landslide surface and connecting a plurality of segmented pile bodies (16).

4. The landslide fixing method based on the integrated irrigation and drainage device according to claim 2 is characterized in that: The step S2 also includes: the burial depth of the water collection well (22) does not exceed 0.5 meters, the filter well cover (21) thereof is at the same height as the surface of the soil (4), and the burial depth of the main well body (210) does not exceed 1.5 meters.

5. The landslide fixing method based on the integrated irrigation and drainage device according to claim 2 is characterized in that: Said step S3 and step S4 also include: the irrigation range of the slope well body (217) should fully cover the green plants in the irrigation area (3); the lifting pressure casing of the slope well body (217) can adjust the irrigation water output according to the change of the water pressure in the pipe.

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