Anti-clogging buried pipe drainage system for low permeability soil

Abstract

The application relates to the technical field of agricultural water conservancy engineering, and provides an anti-clogging underground pipe drainage system for low-permeability soil. The anti-clogging underground pipe drainage system comprises a plurality of drainage assemblies arranged along a first direction, the length of the drainage assemblies extends along a second direction, and a partition plate is embedded in the soil in the drainage assemblies; a capillary water guide body is arranged below the partition plate, so that the partition plate blocks soil particles from entering a flow guide cavity of the capillary water guide body downwards; the capillary water guide body absorbs water permeated in the soil through capillary siphon action; a sand filter layer is arranged below the capillary water guide body; an underground pipe is embedded in the sand filter layer and located below the capillary water guide body, a plurality of water inlet holes are formed in the pipe wall of the underground pipe, and the water inlet holes are used for receiving at least part of water discharged from the capillary water guide body. The anti-clogging underground pipe drainage system for low-permeability soil provided by the application can solve the problem of poor drainage effect in the prior art in a low-permeability soil area.

Description

Technical Field

[0001] This application relates to the field of agricultural water conservancy engineering technology, specifically to an anti-clogging underground pipe drainage system for low-permeability soil. Background Technology

[0002] Subsurface drainage technology, as a highly efficient underground drainage method, has been widely used in farmland drainage and waterlogging reduction projects, playing a vital role in improving soil moisture and enhancing arable land quality. However, with the increasing application of subsurface drainage technology in various agricultural production scenarios, the requirements for its applicability are constantly rising, and the limitations of existing technologies in specific areas are becoming increasingly apparent. Particularly in the black soil region of Northeast my country, the dual characteristics of the cold climate and low-permeability, heavy clay soil place higher demands on the drainage efficiency and frost resistance of subsurface drainage systems, becoming a key bottleneck restricting the further popularization and application of this technology. In areas with low-permeability soils such as clay and dense soils, the small soil pores and poor water conductivity make it difficult for water to quickly infiltrate into the underground pipes, easily leading to the coexistence of surface water accumulation and deep water stagnation. This not only seriously affects the drainage effect but also causes the inlet of the subsurface pipe to be blocked by fine clay particles for a long time, further exacerbating the decline in the system's drainage capacity and failing to meet the actual production needs of farmland drainage and waterlogging reduction. Summary of the Invention

[0003] This application provides a silt-resistant underground drainage system for low-permeability soils, which solves the problem of poor drainage performance in low-permeability soil areas in the prior art.

[0004] According to an embodiment of the first aspect of this application, an anti-clogging underground pipe drainage system for low-permeability soil includes a plurality of drainage components arranged along a first direction, the length of each drainage component extending along a second direction, and each drainage component comprising: The isolation panels are buried in the soil; A capillary water-conducting body is positioned below the isolation plate, which prevents soil particles from entering the flow cavity of the capillary water-conducting body downwards; the capillary water-conducting body absorbs water that has seeped into the soil through capillary siphon. A sand filter layer is disposed below the capillary water-conducting body; The concealed pipe is buried in the sand filter layer and located below the capillary water guide body. The pipe wall has multiple water inlet holes to receive at least part of the water discharged from the capillary water guide body.

[0005] According to one embodiment of this application, the flow guiding cavity of the capillary water guide extends in a continuously curved shape in the horizontal plane along the second direction.

[0006] According to one embodiment of this application, the capillary water guide includes a plurality of curved units connected end to end, with adjacent curved units bending in opposite directions.

[0007] According to one embodiment of this application, the bending unit is in the shape of an arc, and the radius of the arc is 2.0~3.0mm.

[0008] According to one embodiment of this application, the flow guiding cavity of the capillary water guide extends along the second direction; The capillary water-conducting body includes: The water collection section has a first opening at its upper end, and the first opening is in contact with the lower surface of the isolation plate; a capillary drainage channel is provided on the side wall of the water collection section, through which infiltrated water in the soil enters the interior of the guide cavity; The transition section is connected at its upper end to the lower end of the water collection section; the vertical cross-sectional dimensions of the transition section gradually increase from top to bottom. The upper end of the guide section is connected to the lower end of the transition section, and the lower end forms a second opening, with the sand filter layer covering the second opening.

[0009] According to one embodiment of this application, the height h of the capillary drainage channel is 4σcosθ / s, where σ is the surface tension of water, θ is the contact angle between the inner wall of the capillary drainage channel and water, and s is the soil suction force of the soil.

[0010] According to one embodiment of this application, the height h of the capillary drainage channel is 0.15 mm to 0.25 mm.

[0011] According to one embodiment of this application, the height of the capillary drainage channel is equal to the width of the inner cavity of the water collection section.

[0012] According to one embodiment of this application, along the first direction, each of the drainage components has multiple capillary water guides.

[0013] According to one embodiment of this application, the drainage assembly further includes a negative pressure pump, the suction port of which is connected to at least one of the water outlet side of the concealed pipe and the water outlet side of the capillary water guide.

[0014] The above-described one or more technical solutions in the embodiments of this application have at least one of the following technical effects: In the anti-clogging underground drainage system of this application, an isolation plate is buried in the soil and prevents soil particles from entering the flow cavity of the capillary water-conducting body, thus avoiding channel blockage caused by large soil particles at the source and constructing the first-level anti-clogging barrier. The capillary water-conducting body actively absorbs infiltrated water from the soil through capillary siphon, breaking through the traditional drainage mode of underground pipes that relies solely on gravity infiltration. It can efficiently extract pore water from low-permeability soils such as clay and dense soils, effectively alleviating the problem of coexisting surface water accumulation and deep water stagnation. A sand filter layer is set below the capillary water-conducting body, which can filter out small particles discharged from the capillary water-conducting body and prevent them from entering the inlet of the underground pipe, forming the second-level anti-clogging system. The underground pipe receives water discharged from the capillary water-conducting body through multiple inlet holes on the pipe wall and centrally transports the collected water out of the system, achieving a continuous and stable underground drainage function. The synergistic effect of the above multi-level structure not only effectively improves the drainage efficiency in low-permeability soil areas but also significantly reduces the risk of system clogging, and can stably meet the actual production needs of farmland drainage and waterlogging reduction in the long term.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of the anti-clogging underground drainage system for low-permeability soil provided in this application. Figure 1 (Front-view angle).

[0018] Figure 2 This is a schematic diagram of the structure of the isolation plate and capillary water-conducting body provided in this application. Figure 1 (From a top-down view, only four capillary water-conducting bodies are shown on the isolation plate).

[0019] Figure 3 This is a schematic diagram of the structure of the isolation plate and capillary water-conducting body provided in this application. Figure 2 (For clarity, the partition is only shown on the ground.) Figure 2 (A portion was cut off in the first direction).

[0020] Figure 4 for Figure 3 Sectional view of AA.

[0021] Figure 5This is a structural schematic diagram of the anti-clogging underground drainage system for low-permeability soil provided in this application. Figure 2 (Side view angle).

[0022] Figure label: 1. Drainage components; 11. Isolation plate; 12. Capillary water guide; 121. Bending unit; 122. Water collection section; 1221. First opening; 1222. Capillary drainage channel; 123. Transition section; 124. Guide section; 1241. Second opening; 125. Guide cavity; 13. Sand filter layer; 14. Concealed pipe; 141. Water inlet; 15. Negative pressure pump; 21. Soil; 22. Ground. Detailed Implementation

[0023] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0024] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0026] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0028] According to an embodiment of the first aspect of this application, an anti-clogging underground pipe drainage system for low-permeability soil includes a plurality of drainage components 1 arranged along a first direction, the length of which extends along a second direction, such as... Figure 1 As shown, the drainage assembly 1 includes a baffle plate 11, a capillary water-conducting body 12, a sand filter layer 13, and a culvert 14. The baffle plate 11 is buried in the soil 21. The capillary water-conducting body 12 is located below the baffle plate 11, so that the baffle plate 11 prevents soil particles from entering the flow channel 125 of the capillary water-conducting body 12. The capillary water-conducting body 12 absorbs water that has seeped into the soil 21 through capillary siphon. The sand filter layer 13 is located below the capillary water-conducting body 12. The culvert 14 is buried in the sand filter layer 13 and located below the capillary water-conducting body 12. The culvert 14 has multiple water inlet holes 141 on its wall to receive at least part of the water discharged from the capillary water-conducting body 12. Figure 1 The image also shows the upper surface of soil 21, i.e., ground 22.

[0029] like Figure 2 As shown, the first direction and the second direction can be perpendicular to each other. For example, Figure 2 and Figure 5 The first direction is shown in the diagram. Figure 1 , Figure 2 and Figure 3The second direction is shown in the diagram. The isolation plate 11 is buried at a suitable depth in the soil. The isolation plate 11 can be impermeable, preventing water and soil particles from entering the sand filter layer 13 from above, thus avoiding blockage of the flow channel 125 of the capillary water-conducting body 12. When the isolation plate 11 is impermeable, water in the soil 21 enters the capillary water-conducting body 12 via capillary action in horizontal or inclined directions. The isolation plate 11 and the capillary water-conducting body 12 can be manufactured as an integrated component. The sand filter layer 13 is filled with graded particles, achieving a balance between filtration and water conduction through a reasonable combination of particles of different sizes. The submerged pipe 14 serves as a water collection and conveyance component, collecting filtered water through inlet holes 141 in its pipe wall and discharging it centrally from the system. The inlet holes 141 are evenly distributed along the circumference and axial direction of the submerged pipe 14, and their diameters match the gradation parameters of the sand filter layer 13, allowing water from the soil to enter the submerged pipe 14 while preventing water from the sand filter layer 13 from entering it. It should be noted that... Figure 1 The label "11+12" in the figure refers to the fact that the isolation plate 11 and the capillary water guide body 12 are shown as a single component in the figure.

[0030] The impermeable barrier 11 forms a localized catchment area, significantly improving drainage efficiency in extremely low-permeability soils. Simultaneously, it intercepts large soil particles at the source, constructing the first-level anti-clogging barrier and reducing the vertical entry of disturbed soil into the culvert 14, thus preventing clogging. The capillary action of the capillary water-conducting body 12 overcomes the traditional drainage mode of the culvert 14, which relies solely on gravity infiltration, efficiently extracting pore water from the soil and alleviating the problem of both surface water accumulation and deep water stagnation. The graded sand filter layer 13 forms the second-level anti-clogging system, effectively filtering fine particles while maintaining the water conduction rate. The synergistic effect of these multi-level structures enhances the drainage stability and service life of the system.

[0031] In some embodiments, the angle between the first direction and the second direction can be any angle within 90°; for ease of description, the following description will use the example of the first direction and the second direction being perpendicular. The isolation plate 11 can also be a permeable retaining type, suitable for soils with slightly higher permeability, to block soil particles but allow water to pass through. The isolation plate 11 and the capillary water guide 12 can also be separate components.

[0032] According to one embodiment of this application, such as Figure 3 As shown, the flow guiding cavity 125 of the capillary water guide 12 extends in a continuous curved shape in the horizontal plane along the second direction.

[0033] The flow guiding cavity 125 extends along the second direction in the horizontal plane, presenting a continuous curved shape without changing the arrangement logic of the drainage components 1 along the first direction. This structure can effectively extend the total length of the flow guiding cavity 125. The curvature of the flow guiding cavity 125 remains uniform, avoiding dead corners where water flow stagnates, ensuring smooth water flow to the sand filter layer 13, and adapting to the integrated manufacturing process of the isolation plate 11 and the capillary water guide body 12.

[0034] The continuously curved guide cavity 125 significantly increases the effective contact area between the capillary water guide body 12 and the soil, improving the coverage and rate of capillary siphon water absorption and alleviating the problem of low water extraction efficiency in low-permeability soils. The curved structure extends the flow path of water within the guide cavity 125, allowing more opportunities for the carried fine particles to settle naturally, reducing the filtration load on the subsequent sand filter layer 13. This structure is compatible with the existing system's installation layout and does not add additional construction difficulty.

[0035] According to one embodiment of this application, such as Figure 2 As shown, from a top view, the capillary water guide 12 includes multiple curved units 121 connected end to end. The bending directions of two adjacent curved units 121 are opposite to form an S-shaped continuous wave structure.

[0036] Multiple curved units 121 are connected end to end, with adjacent bends in opposite directions, extending along the second direction to form a continuous S-shaped structure without altering the arrangement logic of the drainage components 1 along the first direction. This streamlined structure facilitates smooth water flow and utilizes the centrifugal effect of the bends to achieve initial separation of particles from the water. The overall structure is regular and adaptable to the integrated manufacturing process of the isolation plate 11 and the capillary water guide 12, facilitating factory prefabrication and on-site installation.

[0037] The S-shaped structure, after water flows into the guide cavity 125 via capillary action, alters the water flow direction through a continuously bend in the path, resulting in multiple optimization effects: 1. It achieves centrifugal separation: as the water flows continuously along the bend, denser clay particles are affected by centrifugal force and migrate towards the outside of the bend and the bottom opening, reducing the continuous flow of fine particles. 2. It prolongs particle settling time: the settling time of clay particles is greater than the residence time of the water flow, allowing impurities to settle sufficiently to the bottom of the channel and fall back into the lower soil layer through the bottom opening, completing the autonomous separation of mud and water and reducing the filtration load on the downstream filter media structure. 3. It creates a local low-pressure suction effect: the streamlines contract and flow velocity increase on the inner side of the S-shaped bend, generating a low-pressure area based on Bernoulli's principle; this area exerts a traction effect on the upstream water flow, and soil pore water quickly enters the guide cavity 125 under the combined action of capillary force and low-pressure suction, achieving passive flow enhancement without the need for additional power components, thus improving the drainage efficiency of low-permeability soils.

[0038] In some embodiments, the curvature of the bending unit 121 can be adjusted according to the clay content of the soil, with a larger curvature used in areas with higher clay content to enhance the centrifugal separation effect.

[0039] According to one embodiment of this application, the bending unit 121 is in the shape of an arc, and the radius of the arc is 2.0~3.0mm.

[0040] The capillary water guide 12 can adopt an S-shaped streamline design along its length. To ensure uniform flow field distribution inside the bend, stable suction effect, and ease of industrial mold processing, the bending unit 121 of the capillary water guide 12 can be an arc shape, with the radius r of the arc ranging from 2.0 to 3.0 mm.

[0041] like Figure 2 As shown, two adjacent arcs form an S-shape. For example, the central angle corresponding to the arc can be 180°.

[0042] According to one embodiment of this application, such as Figure 3 and Figure 4 As shown, the flow guiding cavity 125 of the capillary water guiding body 12 extends along the second direction; from the cross-sectional perspective of the capillary water guiding body 12, the capillary water guiding body 12 includes a water collecting section 122, a transition section 123, and a flow guiding section 124; wherein, the upper end of the water collecting section 122 forms a first opening 1221, and the first opening 1221 is attached to the lower surface of the isolation plate 11; a capillary drainage channel 1222 is provided on the side wall of the water collecting section 122, and the infiltrated water in the soil enters the interior of the flow guiding cavity 125 through the capillary drainage channel 1222; the upper end of the transition section 123 is connected to the lower end of the water collecting section 122; the cross-sectional dimension of the transition section 123 gradually increases from top to bottom along the vertical direction; the upper end of the flow guiding section 124 is connected to the lower end of the transition section 123, and the lower end of the flow guiding section 124 forms a second opening 1241, and the sand filter layer 13 covers the second opening 1241.

[0043] From the cross-section of the capillary water guide 12, it adopts a three-section layered structure. The upper end of the water collection section 122 is tightly attached to the lower surface of the isolation plate 11, and actively extracts infiltrated water from the soil through the capillary drainage channels 1222 on the side wall, preventing soil particles from directly entering the guide cavity 125. The upper end of the transition section 123 is narrower, which can enhance capillary action; the lower end of the transition section 123 is wider, allowing the small particles carried in the water to settle naturally. The lower end of the guide section 124 is in direct contact with the sand filter layer 13, smoothly guiding the water after initial settling into the sand filter layer 13 for secondary filtration. The overall structure is suitable for factory prefabrication and rapid on-site installation.

[0044] The water collection section 122 enhances the extraction efficiency of pore water from low-permeability soil through capillary drainage channels 1222 distributed on its sidewalls, while the upper end is designed with a baffle plate 11 to prevent large particles from entering the cavity at the source. The gradual structure of the transition section 123 reduces the water flow velocity, allowing clay and silt particles in the water to settle sufficiently. The sand filter layer 13 at the closed sidewall of the guide section 124 and the second opening 1241 allows some water to flow and discharge in the second direction within the guide cavity 125; simultaneously, due to the permeability of the sand filter layer 13, some water permeates downwards through the second opening 1241 into the sand filter layer 13 and eventually enters the culvert 14. The three-section structure works synergistically to significantly improve the system's anti-clogging capability and drainage stability.

[0045] In some embodiments, the water collection section 122, transition section 123, and guide section 124 can be an integral structure, and their wall thicknesses can be set to be the same, such as 0.2 mm to 0.35 mm. The divergence angle α of the transition section 123 is controlled within the range of 5° to 15° to reduce local resistance, while considering compressive strength and drainage capacity. The width of the second opening 1241 is 0.7 to 0.8 mm. The thickness of the baffle plate 11 can be 0.15 mm, the height of the transition section 123 is 0.7 mm to 0.9 mm, the height of the guide section 124 is 0.9 mm to 1.1 mm, and the total height of the "baffle plate 11 + capillary water guide body 12" can be 2.2 mm to 2.6 mm. The thickness of the sand filter layer 13 can be 20 mm to 40 mm.

[0046] According to one embodiment of this application, the height h of the capillary drainage channel 1222 is 4σcosθ / s, where σ is the surface tension of water, θ is the contact angle between the inner wall of the capillary drainage channel 1222 and water, and s is the soil suction force. At 20℃, σ is 0.0728 N / m, and θ = 0°~30° (0° can be used after hydrophilic treatment). s Considering the clay weight of black soil, a range of 1200 Pa to 2000 Pa can be taken.

[0047] The above calculation formula, based on the core principle of capillary action, is used to limit the reasonable height of the capillary drainage channel 1222, taking into account three key physical conditions: water surface tension, the contact angle of the channel inner wall, and soil suction. The structural dimensions are determined based on the formula derivation, conforming to the water and soil transport environment of low-permeability soil, ensuring that the capillary drainage channel 1222 can stably generate capillary adsorption. This matches the soil infiltration pattern, reducing water diversion failure or channel blockage caused by unreasonable structural dimensions.

[0048] According to one embodiment of this application, the height h of the capillary drainage channel 1222 is 0.15 mm to 0.25 mm.

[0049] The height of the aforementioned capillary drainage channel 1222 is precisely adapted to the hydrological characteristics of dense, low-permeability soils, effectively activating the capillary water absorption effect and improving the problem of weak permeability in this type of soil. This size can limit the entry of fine soil particles into the channel interior, reduce the accumulation of impurities inside the cavity, and reduce the probability of clogging from the microstructure. The reasonable channel height does not restrict normal water flow, forming a balance between long-term water diversion and impurity blocking.

[0050] According to one embodiment of this application, such as Figure 4 As shown, the height h of the capillary drainage channel 1222 is equal to the inner cavity width b of the water collection section 122, which can be 0.15mm to 0.25mm.

[0051] The height of the capillary drainage channel 1222 and the width of the inner cavity of the water collection section 122 are set to be the same size, and the two are seamlessly connected to form an integral and continuous L-shaped capillary channel structure. This integrated corner structure can expand the range of action of water surface tension, allowing capillary force to be continuously transmitted. The inner wall of the channel is smooth, reducing water flow obstruction, and relying on the formed L-shaped space to stabilize and enhance siphon conditions, making it suitable for water diversion conditions in low-permeability soils.

[0052] The L-shaped connecting structure extends the effective path of capillary action, continuously stabilizing the foundation of capillary siphon drainage. This structure, combined with the protective function of the isolation plate 11, restricts soil particles from entering the channel, guiding infiltration water only along a fixed path and maintaining the unobstructed state of the capillary drainage channel 1222.

[0053] According to one embodiment of this application, such as Figure 2 As shown, along the first direction, each drainage assembly 1 has multiple capillary water guides 12.

[0054] Multiple sets of capillary water-conducting bodies 12 are arranged inside a single drainage component 1 along a first direction, with each capillary water-conducting body 12 maintaining an independent arrangement. This multi-unit layout can disperse the water collection area, adapting to the scattered moisture distribution characteristics of low-permeability soils. Each set of capillary water-conducting bodies 12 can independently perform capillary water-guiding functions, with water flow transport not interfering with each other. The overall layout fits the extended structure of the drainage component 1, adapting to underground installation.

[0055] Multiple capillary water-conducting bodies 12 are evenly spaced along a first direction, with reasonable gaps reserved between adjacent capillary water-conducting bodies 12. The isolation plate 11 is laid continuously, completely covering the area above all capillary water-conducting bodies 12. Each capillary water-conducting body 12 can independently connect to the underlying sand filter layer 13, with multiple structures working together to complete the water collection operation. The number of capillary water-conducting bodies can be flexibly adjusted according to the actual soil infiltration conditions to adapt to the drainage needs of different areas.

[0056] Figure 5The image shows multiple (3) drainage components 1 arranged along the first direction. It can be seen that each drainage component 1 is provided with multiple capillary water guides 12.

[0057] According to one embodiment of this application, such as Figure 1 As shown, the drainage assembly 1 also includes a negative pressure pump 15, the suction port of which is connected to at least one of the water outlet side of the concealed pipe 14 and the water outlet side of the capillary water guide body 12.

[0058] The negative pressure pump 15 can be selectively connected to either the water outlet side of the concealed pipe 14 or the water outlet side of the capillary water guide 12, or it can simultaneously connect and assemble the two structures. The negative pressure pump 15 assists water flow through negative pressure traction, working in conjunction with the capillary siphon effect of the capillary water guide 12 to compensate for the weak infiltration rate in low-permeability soils. The addition of the negative pressure pump 15 does not alter the original buried structure of the drainage system and is compatible with the multi-stage anti-clogging system composed of the isolation plate 11 and the sand filter layer 13.

[0059] The negative pressure pump 15 provides active traction power and forms a dual water delivery mechanism with capillary water inlet, effectively overcoming the seepage resistance caused by the dense structure of low-permeability soil and accelerating the drainage of stagnant water. The negative pressure environment reduces water retention and accumulation in the cavity and pipes, lowers the probability of fine impurity deposition, and helps improve the anti-clogging capability of the entire drainage structure. Flexible connection methods can adapt to various site conditions, broadening the applicability of the drainage system.

[0060] In some embodiments, the negative pressure pump 15 can be equipped with a pressure regulating structure to adjust the negative pressure intensity according to the soil compaction and water accumulation, maintaining a stable water delivery state. Multi-component flow pipelines can also be installed, allowing a single negative pressure pump 15 to synchronously link multiple drainage components 1, reducing the number of devices required and saving installation costs.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application and should be covered within the scope of the claims of this application.

Claims

1. A silt-resistant underground drainage system for low-permeability soils, characterized in that, Includes multiple drainage components (1) arranged along a first direction, the length of the drainage components (1) extending along a second direction, the drainage components (1) comprising: The isolation panel (11) is buried in the soil (21); A capillary water-conducting body (12) is disposed below the isolation plate (11) so that the isolation plate (11) blocks soil particles from entering the flow channel (125) of the capillary water-conducting body (12) downwards; the capillary water-conducting body (12) absorbs water that has seeped into the soil (21) through capillary siphon. A sand filter layer (13) is disposed below the capillary water guide (12); The concealed pipe (14) is buried in the sand filter layer (13) and located below the capillary water guide body (12). The concealed pipe (14) has multiple water inlet holes (141) on its wall to receive at least part of the water discharged from the capillary water guide body (12).

2. The anti-clogging underground drainage system for low-permeability soil according to claim 1, characterized in that, The flow guiding cavity (125) of the capillary water guide (12) extends in a continuous curved shape in the horizontal plane along the second direction.

3. The anti-clogging underground drainage system for low-permeability soil according to claim 2, characterized in that, The capillary water guide (12) includes a plurality of curved units (121) connected end to end, with adjacent curved units (121) bending in opposite directions.

4. The anti-clogging underground drainage system for low-permeability soil according to claim 3, characterized in that, The bending unit (121) is in the shape of an arc, and the radius of the arc is 2.0~3.0mm.

5. The anti-clogging underground drainage system for low-permeability soil according to claim 1, characterized in that, The flow guiding cavity (125) of the capillary water guide (12) extends along the second direction; The capillary water-conducting body (12) includes: The water collection section (122) has a first opening (1221) at its upper end, and the first opening (1221) is in contact with the lower surface of the isolation plate (11); a capillary drainage channel (1222) is provided on the side wall of the water collection section (122), and the infiltration water in the soil (21) enters the interior of the guide cavity (125) through the capillary drainage channel (1222); The upper end of the transition section (123) is connected to the lower end of the water collection section (122); the vertical cross-sectional dimensions of the transition section (123) gradually increase from top to bottom. The upper end of the guide section (124) is connected to the lower end of the transition section (123), and the lower end forms a second opening (1241), and the sand filter layer (13) covers the second opening (1241).

6. The anti-clogging underground drainage system for low-permeability soil according to claim 5, characterized in that, The height h of the capillary drainage channel (1222) is 4σcosθ / s, where σ is the surface tension of water, θ is the contact angle between the inner wall of the capillary drainage channel (1222) and water, and s is the soil suction force of the soil.

7. The anti-clogging underground drainage system for low-permeability soil according to claim 5, characterized in that, The height h of the capillary drainage channel (1222) is 0.15 mm to 0.25 mm.

8. The anti-clogging underground drainage system for low-permeability soil according to claim 5, characterized in that, The height of the capillary drainage channel (1222) is equal to the width of the inner cavity of the water collection section (122).

9. The anti-clogging underground drainage system for low-permeability soil according to any one of claims 1 to 8, characterized in that, Along the first direction, each of the drainage components (1) has multiple capillary water guides (12).

10. The anti-clogging underground drainage system for low-permeability soil according to any one of claims 1 to 8, characterized in that, The drainage assembly (1) also includes a negative pressure pump (15), the air inlet of which is connected to at least one of the water outlet side of the concealed pipe (14) and the water outlet side of the capillary water guide (12).

Images