Anti-skid drainage system for large waste slag accumulation body in gully and construction method

Abstract

The invention provides an anti-sliding drainage system for a large waste slag accumulation body in a gully and a construction method, relates to a waste slag body sliding resistance and drainage technology, and particularly discloses an anti-sliding blocking system for a waste slag accumulation body, an underground drainage system within the range of the accumulation body and a ground drainage open trench. The anti-sliding blocking system comprises a plurality of arch-type blocking structures, a plurality of stack-type supporting structures and a sheet-pile wall at the end of an accumulation body. The underground drainage system comprises a first drainage section arranged along the outer arc face of the arch type blocking structure, a water collecting well arranged in the center of a downstream gully of the arch type blocking structure, a plurality of second drainage sections with the two ends communicating with the first drainage section and the water collecting well correspondingly, and a gully center culvert communicating the water collecting wells with the outer side ditch of the sheet-pile wall. The two systems and the ground drainage open trench work cooperatively, the effects of preventing the waste slag accumulation body from sliding, intercepting surface water and draining water seepage in the accumulation body are achieved, and the risk that the waste slag body slides and even forms debris flow is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-slip drainage of waste slag bodies in slag yards, and in particular to an anti-slip drainage system for large waste slag accumulation bodies in gullies and a construction method thereof. Background Art

[0002] Mountain gully waste dumps utilize natural gully terrain to create storage spaces. Existing technologies typically prioritize gully geological stability, employing methods such as platform-based graded filling, gravity retaining walls or pile-sheet walls at the ends, and surface drainage ditches to achieve large storage capacity at a low cost. However, in practice, they face multiple disadvantages: Inaccurate predictions of rainstorm runoff in small watersheds often lead to underestimated drainage facility design capacity and susceptibility to blockage and failure; strong infiltration causes slag to saturate and increase weight, leading to a sudden increase in pore water pressure; seepage erosion within the slag and at the interface with the base can easily lead to piping; and quality control of foundation clearing and compaction during construction is challenging. These combined factors can easily lead to landslides and even debris flows at waste dumps. Therefore, the reliability of drainage systems and the anti-slip properties of the slag and at the interface with the base are key bottlenecks to the safety of waste dumps in mountain gully waste dumps. Numerous waste dump-induced landslides and debris flows in recent years have been attributed to these factors. Summary of the Invention

[0003] The purpose of the present invention is to provide an anti-skid drainage system and construction method for large-scale waste accumulation bodies in gullies, which can solve the problems raised by the above-mentioned background technology in view of the shortcomings of the existing technology.

[0004] The technical solution of the present invention is achieved as follows: The present invention provides an anti-skid drainage system and construction method for a large-scale waste accumulation body in a gully, comprising an anti-skid interception system, an underground drainage system and a surface drainage ditch; the anti-skid interception system comprises a plurality of arch interception structures symmetrically arranged along the gully center axis, a plurality of stack-type support structures and a pile-sheet wall arranged at the end of the waste accumulation body downstream of the gully; the underground drainage system comprises a first drainage section arranged along the outer arc surface of the arch interception structure, a water collection well arranged in the gully center downstream of the arch interception structure, a plurality of second drainage sections whose two ends are respectively connected to the first drainage section and the water collection well, and a ditch core culvert connecting the plurality of water collection wells and the ditch outside the pile-sheet wall.

[0005] In some technical solutions of the present invention, the arch intercepting structure includes an anti-slip tooth wall and a pile-type arch seat installed on the original ground of the gully; the outer arc surface of the anti-slip tooth wall faces upstream of the gully; and the pile-type arch seats are arranged at both ends of the anti-slip tooth wall.

[0006] In some technical solutions of the present invention, the lower part of the anti-slip tooth wall is embedded below the original ground, and the anti-slip tooth wall adopts a gravity retaining wall section; the foundation of the pile-type arch seat is embedded in the bedrock.

[0007] In some technical solutions of the present invention, the stack-type retaining structure is arranged normal to the gully center axis; the stack-type retaining structure includes several anti-slip stacks, which are evenly distributed on the original ground of the gully; the foundations of the anti-slip stacks are embedded in the bedrock.

[0008] In some technical solutions of the present invention, the first drainage section is arranged close to the wall surface of the anti-slip tooth wall and the pile-type arch seat; the bottom of the first drainage section is basically parallel to the top surface of the arch-type intercepting structure.

[0009] In some technical solutions of the present invention, the first drainage section includes a collection ditch, an impermeable geotextile layer, a first permeable geotextile layer, a first graded gravel layer, and a drainage blind pipe; the collection ditch adopts a masonry structure; the ditch wall and the bottom surface of the ditch are covered with an impermeable geotextile layer; a drainage blind pipe is installed in the collection ditch; a first graded gravel layer for covering the drainage blind pipe is installed in the collection ditch; and a first permeable geotextile layer is installed on the top surface of the first graded gravel layer.

[0010] In some technical solutions of the present invention, the second drainage section includes a ditch body, a cover plate, a second permeable geotextile layer, and a second graded crushed stone layer. The ditch body of the second drainage section is embedded below the original gully surface. The ditch body has an isosceles trapezoidal cross-section. Seepage joints are provided between adjacent cover plates. A second graded crushed stone layer is provided above the cover plates. The second graded crushed stone layer is surrounded by a second permeable geotextile layer.

[0011] In some technical solutions of the present invention, the trench culvert includes a trench opened at the bottom of the slope trench, and a concrete foundation is provided at the bottom of the trench; a culvert connected to a water collection well is installed on the top surface of the concrete foundation, a third graded gravel layer for covering the culvert is provided in the trench, and a third permeable geotextile layer is laid on the top surface of the third graded gravel layer; permeable pipes are provided on both sides of the culvert in the third graded gravel layer; the water outlet end of the permeable pipe is connected to the water collection well.

[0012] In some technical solutions of the present invention, the water collection well is respectively connected to the culvert of the ditch culvert and the second drainage section.

[0013] In the technical solution of the present invention, the construction method includes the following steps: Clean the gully surface and measure and lay out the lines; Construct a pile-board wall at the end of the spoil pile; Determine the plane position and height of the culvert, arch intercepting structure and water collection well; Excavate section by section from the downstream of the gully to the upstream and construct the gully core culvert and water collection well. The water collection well is reserved with a hole connecting to the second drainage section. Arch-type intercepting structures are constructed step by step from the downstream to the upstream of the gully. First, deep holes are excavated at both ends of the anti-slip tooth wall to construct pile-type arch seats, and then the anti-slip tooth wall is excavated and constructed. Excavate the outer surface of the arch intercepting structure and construct the first drainage section; Excavating and constructing a second drainage section between the end of the first drainage section and the adjacent water collection well; Construction of anti-slip piles; Backfill the waste and compact it to the required density; After the waste slag backfill is completed, the top surface and slope of the waste slag accumulation body are repaired, and open drainage ditches are excavated and constructed on the ground.

[0014] Compared with the existing technology, the present invention has at least the following advantages or beneficial effects: the arch-shaped anti-slip intercepting structure fully utilizes its high compressive bearing capacity through the arch design. Compared with the traditional gravity retaining wall, it significantly improves the anti-slip stability and anti-overturning ability of the anti-slip tooth wall, enhances the overall stability and anti-deformation ability, and provides a more reliable anti-slip support for the waste pile. The anti-slip intercepting structure is combined with the water collection ditch to intercept the seepage water in the upstream waste pile and guide it in sections. The seepage water inside the waste pile is intercepted by the anti-slip intercepting structure and the water collection ditch, and then sent to the ditch core culvert for centralized discharge through the drainage ditch, the water content inside the pile is reduced, water-rich siltation is avoided, and the potential risk of debris flow disasters is effectively reduced. The anti-slip piles with a decentralized structure can adapt to the irregular undulating slopes of V-shaped valleys and have significant anti-pushing force. The filling bodies between the anti-slip piles form seepage channels, which effectively guide the water seepage inside the waste slag accumulation body, avoid the local water pressure accumulation caused by the water blocking effect, improve the soil mechanical properties, and thus enhance the anti-slip stability of the waste slag accumulation body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the top view of the anti-skid drainage system in the present invention.

[0016] Figure 2 This is a side view of the anti-skid drainage system of the present invention.

[0017] Figure 3 It is a top view schematic diagram of the combined structure of the anti-sliding interception system and the underground drainage system inside the slope in the present invention.

[0018] Figure 4 It is a schematic diagram of the top view of the combined structure of the arch intercepting structure, the first drainage section, the second drainage section and the water collection well in the present invention.

[0019] Figure 5 It is a schematic side view of the combined structure of the arch intercepting structure and the first drainage section in the present invention.

[0020] Figure 6 This is a schematic diagram of the cross-sectional structure of the first drainage section in the present invention, which is also Figure 6 A large sample picture in .

[0021] Figure 7 It is a schematic cross-sectional structural diagram of the second drainage section in the present invention.

[0022] Figure 8 This is a schematic diagram of the second drainage section and the water collection well at the joint in the present invention.

[0023] Figure 9 It is a schematic diagram of the installation structure of the water outlet end and the water collection well of the ditch culvert in the present invention.

[0024] Figure 10 It is a schematic diagram of the installation structure of the water inlet end and the water collection well of the ditch culvert in the present invention.

[0025] Figure 11 It is a schematic diagram of the cross-sectional structure of the ditch culvert in the present invention.

[0026] Figure 12 It is a schematic diagram of the stack-type retaining structure in the present invention.

[0027] Figure numerals: 1. open surface drainage ditch; 2. arch intercepting structure; 3. anti-skid tooth wall; 4. pile arch seat; 5. pile-board wall; 6. anti-skid pile; 7. first drainage section; 8. collection ditch; 9. anti-seepage geotextile layer; 10. first seepage geotextile layer; 11. first graded crushed stone layer; 12. drainage blind pipe; 13. second drainage section; 14. ditch body; 15. cover plate; 16. second seepage geotextile layer; 17. third graded crushed stone layer; 18. collection well; 19. ditch culvert; 20. culvert; 21. permeable pipe; 22. concrete foundation; 23. third graded crushed stone layer; 24. third seepage geotextile layer. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0030] Example The present invention provides an anti-skid drainage system for large-scale waste accumulation bodies in gullies, such as Figures 1-12As shown, it includes an anti-slip interception system, an underground drainage system and a surface drainage ditch 1; the surface drainage ditch 1 runs through the entire surface of the waste accumulation body along the longitudinal direction of the gully and connects the gully upstream of the accumulation body and the ditch downstream of the accumulation body, mainly to divert the surface water on the top surface of the waste accumulation body and the gully water upstream of the accumulation body, reduce water seepage inside the waste accumulation body, avoid the increase of moisture in the accumulation body, and affect the stability of the waste accumulation body.

[0031] Preferably, a 4% drainage slope is provided on the top surface of the waste accumulation body toward the open ground drainage ditch 1 .

[0032] A number of arch intercepting structures 2 symmetrically arranged along the axis of the gully center and a first drainage section 7 attached to the arch intercepting structure 2 are provided on the original ground below the waste accumulation body. The arch intercepting structure 2 is used to support the waste accumulation body to prevent the waste accumulation body upstream from sliding along the original ground toward the gully center and the downstream direction of the arch intercepting structure 2. The first drainage section 7 is close to the outer arc surface of the arch intercepting structure 2, and relies on the arch intercepting structure 2 and the first drainage section 7 itself to effectively intercept and drain the seepage water inside the waste accumulation body.

[0033] The first drainage section 7, the second drainage section 13, the water collection well 18, and the ditch culvert 19 jointly form an underground drainage system. Groundwater collected by the first drainage section 7 flows through the second drainage section 13 into the water collection well 18. From the water collection well 18, it is then discharged through several downstream sections of the ditch culvert 19 and several water collection wells 18 into the ditch downstream of the waste accumulation body. This forms a complete drainage system within the waste accumulation body, ensuring that the moisture content within the waste accumulation body is consistently maintained within a low range.

[0034] Preferably, the second drainage section 13 and the ditch culvert 19 not only have the drainage function, but also have a certain ability to intercept seepage water.

[0035] Within the range of the waste accumulation body, one or several stack-type support structures are provided on the downstream side of any arch-type intercepting structure. The stack-type support structures are arranged along the normal direction of the gully center axis. The stack-type support structures have a strong ability to resist the sliding of the waste accumulation body on the upstream side, but will not intercept the seepage inside the waste accumulation body. The seepage water flows downstream through the side of the anti-slip stack 6 of the stack-type support structure. Finally, a pile-sheet wall 5 is provided at the lock position of the waste accumulation body. The pile-sheet wall 5 is a commonly used support structure for the gully waste accumulation body at the lock position. The aforementioned arch-type intercepting structure 2, stack-type support structure and pile-sheet wall 5 together constitute an anti-slip intercepting system with multiple supports. Through the coordinated work of various structures within the system, the risk of sliding of the waste accumulation body is resisted.

[0036] The aforementioned anti-slip interception system, underground drainage system and surface drainage ditch 1 work together to prevent the sliding of the waste slag accumulation body and effectively intercept surface water and drain underground seepage water, greatly reducing the possibility of accumulation body landslide or even mud and rock flow, and significantly reducing the risk of geological disasters.

[0037] Working process of the anti-skid drainage system for large waste accumulation in gullies: The surface drainage ditch 1 intercepts the surface runoff of the waste accumulation body and collects precipitation, and directs it to the external ditch to reduce the infiltration of surface water into the accumulation body; The arch intercepting structure 2 is arranged longitudinally along the gully to form a supporting skeleton, and the first drainage section 7 provided on the outer arc surface thereof collects the seepage water flowing from the waste accumulation body to the arch intercepting structure 2; The water in the first drainage section 7 flows into the second drainage section 13 and merges with the seepage water intercepted by the second drainage section 13 itself and flows into the water collection well 18; the seepage water collected by the permeable pipe 21 inside the ditch culvert 19 flows into the water collection well 18; The water in the water collection well 18 is discharged into the external ditch through the culvert 20 in the downstream ditch core culvert 19 and the downstream water collection well 18; The pile-type retaining structure is placed downstream of the arch-type intercepting structure 2 to strengthen the restraint on the waste accumulation body; The pile-sheet wall 5 supports the entire waste slag accumulation body at the locking point.

[0038] In some technical solutions of the present invention, the arch-type intercepting structure 2 includes an anti-slip tooth wall 3 installed at the original ground of the gully. The anti-slip tooth wall 3 adopts a pitched retaining wall section, and its lower part is embedded below the original ground. It itself has certain anti-slip and anti-overturning capabilities; both ends of the anti-slip tooth wall 3 are installed with pile-type arch seats 4 for supporting the anti-slip tooth wall 3, and its pile foundation is deeply embedded in the bedrock. The pile-type arch seat 4 and the waste slag accumulation body work together to further provide lateral constraints for the anti-slip tooth wall 3, thereby improving the anti-slip and anti-overturning capabilities of the anti-slip tooth wall 3.

[0039] In some technical solutions of the present invention, the anti-slip tooth wall 3 is arranged in an arc shape in the plane, and its outer arc surface faces upstream of the gully, facing the direction of horizontal sliding force generated by the waste slag accumulation body. The arch structure converts the thrust of the slag body into axial pressure, giving full play to the compressive strength of concrete and improving the bearing capacity of the structure.

[0040] Preferably, the anti-slip tooth wall 3 is made of concrete, embedded at a depth of not less than 1.2m and exposed at least 0.8m above the ground. The pile arch seat 4 is made of reinforced concrete, embedded in the bedrock at least 3m and exposed 0.6m above the ground.

[0041] Preferably, multiple arch-shaped intercepting structures 2 can be installed within the waste slag accumulation area, arranged in a fan-shaped pattern. The size of the arc formed on the plane should be determined by comprehensively analyzing the water collection and slag pushing force requirements at the location, and after calculating the reasonable arch axis (referring to the calculation method of the arch bridge axis, with the maximum load-bearing capacity). The arc length should be calculated based on the upper limit of the drainage volume. This way, the drainage system flow will not exceed the specified flow rate. This ensures that the arch-shaped intercepting structures 2 and the drainage structure have the best drainage capacity and achieve the best interception effect. Generally speaking, the arc length of a single arch-shaped intercepting structure 2 should not exceed 30m.

[0042] In some technical solutions of the present invention, the pile-sheet wall 5 is a reinforced concrete structure, and adopts a conventional structural arrangement according to design requirements.

[0043] Preferably, when engineering conditions permit, a gravity retaining wall may be used instead of the pile-sheet wall 5 to lock the waste accumulation body.

[0044] In some technical solutions of the present invention, the stack type retaining structure is arranged between any two adjacent arch type intercepting structures 2, and between the pile-board wall and the adjacent arch type intercepting structure 2; the stack type retaining structure includes several anti-slip stacks 6, and the several anti-slip stacks 6 are evenly distributed on the original ground of the gully.

[0045] Preferably, a pile-type retaining structure is arranged on a slope from the bottom of the gully to the slopes on both sides with a slope ratio not steeper than 1:2.

[0046] Preferably, the anti-slip piles 6 are constructed of reinforced concrete, embedded at least 1.5 meters into the bedrock and protruding 1.0 meter above the surface. Multiple anti-slip piles 6 can be arranged in a row at regular intervals as needed. A single row of anti-slip piles 6 can be arranged in a straight line or perpendicular to the direction of potential slip (e.g., in a broken line or arched shape).

[0047] Preferably, the anti-slip stack 6 has a rectangular cross-section, the length of the anti-slip stack 6 in the direction of resisting slag sliding is 2.0m to 2.5m, the width of the anti-slip stack 6 is 1.5m to 2.0m, and the net distance between adjacent anti-slip stacks 6 is 3.0m to 4.0m.

[0048] In some technical solutions of the present invention, the underground drainage system includes a first drainage section 7 arranged at the bottom of the outer arc surface of the arched intercepting structure 2, and a second drainage section 13 connected to the first drainage section 7 is provided at both ends of the arched intercepting structure 2. A collection well 18 connected to the second drainage section 13 is provided on the side of the arched intercepting structure 2 away from the top of the waste accumulation body, and the two second drainage sections 13 and the connected collection wells 18 are "V"-shaped in the plane. A ditch culvert 19 is provided between any two collection wells 18 arranged longitudinally along the slope, and the ditch culvert 19 is connected to the collection well 18. The last collection well 18 downstream of the gully is connected to the ditch outside the pile wall 5 through the last section of the ditch culvert 19. The first drainage section 7 collects the seepage water flowing to the foot of the arch intercepting structure 2, and then, under the guidance of the second drainage section 13, the seepage water intercepted by the second drainage section 13 is merged and introduced into the collection well 18. In addition, the seepage water collected by the permeable pipe 21 inside the ditch culvert 19 will also flow into the collection well 18. Then, the water in the collection well 18 is introduced into the downstream ditch of the waste accumulation body through the downstream ditch culvert 19 and the collection well 18. The above structure realizes the linkage water diversion, forming a three-dimensional drainage path from line to surface and surface to network, thereby improving the drainage efficiency and preventing the water content in the waste body from being too high.

[0049] Preferably, the water collection well 18 is rectangular and 2.5 m deep. The inner wall of the water collection well 18 is 300 mm wide from the edge of the culvert 20. The well bottom is at least 500 mm lower than the outlet of the culvert 20, the outlet of the second drainage section 13, and the outlet of the permeable pipe, and is flush with the bottom of the water inlet of the culvert 20. The culvert 20 is preferably made of corrugated steel pipe.

[0050] Moreover, in the entire system, after each arch-type intercepting structure 2 is combined with the drainage structure, a water collection well 18 is provided near the center of the arch of the arc-shaped arch-type intercepting structure 2 on the plane.

[0051] In some technical solutions of the present invention, the first drainage section 7 includes a drainage ditch 8 disposed on the side of the arched intercepting structure 2 facing the top of the waste accumulation body. The walls and bottom surfaces of the drainage ditch 8 are covered with an impermeable geotextile layer 9. A drainage blind pipe 12 is installed within the drainage ditch 8, as well as a first graded crushed stone layer 11 covering the drainage blind pipe 12. A first permeable geotextile layer 10 is also installed on the top surface of the first graded crushed stone layer 11. Seepage water is filtered by the first permeable geotextile layer 10, flows through the first graded crushed stone layer 11, and then flows out of the drainage blind pipe 12. The first permeable geotextile layer 10 filters water and prevents siltation, while the first graded crushed stone layer 11 resists soil pressure and filters water, ensuring the long-term patency of the drainage blind pipe 12 and reducing maintenance costs.

[0052] Preferably, the water collecting ditch 8 adopts a masonry structure. The water collecting ditch 8 is arranged on the upstream side of the arch anti-skid tooth wall 3 and is close to the wall surface. The bottom of the water collecting ditch 8 is basically parallel to the top surface of the anti-skid tooth wall 3. The water collecting ditch 8 and its drainage blind pipe 12 are set with a drainage longitudinal slope of not less than 0.5% from the arch top to the arch feet at both ends.

[0053] In some technical solutions of the present invention, the ditch body 14 of the second drainage section 13 adopts an isosceles trapezoidal cross-section, a cover plate 15 is installed on the top surface of the ditch body 14, a second graded gravel layer 17 is arranged above the cover plate 15, and the periphery of the second graded gravel layer 17 is completely covered by the second permeable geotextile layer 16.

[0054] Preferably, the ditch body 14 adopts a masonry structure, and the ditch body 14 is embedded at least 300 mm below the original ground of the gully. When the longitudinal slope of the second drainage section 13 exceeds 1:1.5, an anti-skid platform is set at the bottom of the ditch body 14.

[0055] Preferably, the cover plate 15 is a reinforced concrete rectangular cover plate; and a water seepage gap with a width of 3 mm to 5 mm is provided between adjacent cover plates 15 .

[0056] In some technical solutions of the present invention, the culvert 19 includes a trench opened at the bottom of the slope, a concrete foundation 22 is provided at the bottom of the trench, a culvert 20 connected to the collection well 18 is installed on the top surface of the concrete foundation 22, a third graded gravel layer 23 for covering the culvert 20 is provided in the trench, a third permeable geotextile layer 24 is laid on the top surface of the third graded gravel layer 23, and a permeable pipe 21 is provided on both sides of the culvert 20 in the third graded gravel layer 23, the water outlet end of the permeable pipe 21 is connected to the collection well 18, and the permeable pipe 21 can gather and discharge the seepage water outside the culvert 20 inside the trench to the collection well 18.

[0057] Preferably, the ditch culvert 19 is arranged between the pile bodies of the pile-sheet wall 5 and between adjacent anti-slip piles 6 of the pile-type retaining structure.

[0058] Preferably, the ditch culvert 19 is arranged with its top surface lower than the bottom surface of the first drainage section 7 and passes through the lower part of the arch-type intercepting structure 2.

[0059] Preferably, the permeable pipe 21 is a permeable blind pipe, and additional permeable blind pipes can be arranged in a direction perpendicular to the gully. The permeable blind pipes located in the gully are connected to the permeable blind pipes in the ditch culvert 19 in a "Y" shape, and the collected water is discharged into the collection well 18 along the direction of the ditch culvert 19.

[0060] Preferably, the diameter of the culvert 20 may be increased in sections from upstream to downstream of the gully according to the water flow rate.

[0061] The construction method of the anti-skid drainage system for large-scale waste accumulation in gullies includes the following design and construction steps: Clean the gully surface and measure and lay out the lines; Construct a pile-sheet wall 5 at the end of the spoil pile; Stake out the planar positions of the culvert 19, the arch intercepting structure 2, the water collection well 18, etc., measure the longitudinal section, and determine the bottom elevation of the culvert 19, the bottom elevation of the water collection well 18, and the base elevation of the arch intercepting structure 2; From the downstream of the gully to the upstream, the culvert 19 and the water collection well 18 are excavated section by section, and a hole is reserved in the well body of the water collection well 18 to connect with the second drainage section 13; From the downstream of the gully to the upstream, the arch intercepting structure 2 is constructed step by step. First, deep holes are excavated at both ends of the anti-slip tooth wall 3 to construct pile-type arch seats 4. Then, the anti-slip tooth wall 3 is excavated and constructed. The first drainage section 7 is excavated on the outer curved surface of the arch intercepting structure 2, and then a drainage ditch 8, an anti-seepage geotextile layer 9, a drainage blind pipe 12, a first graded crushed stone layer 11, and finally a first permeable geotextile layer 10 is laid to form the first drainage section 7; The second drainage section 13 is excavated between the end of the first drainage section 7 and the adjacent water collection well 18. An anti-slip platform is excavated at the slope steeper than 1.5m. The trench body 14 and the anti-slip platform are then constructed at one time. The cover plate, the second permeable geotextile layer 16, and the second graded crushed stone layer 17 are then installed in sequence. Finally, the second permeable geotextile layer 16, which is left with a sufficient width, is used to completely cover the second graded crushed stone layer 17. Avoid the ditch culvert 19 and construct anti-slip pile 6; Backfill the waste and compact it to the required density; After the waste slag backfill is completed, the top surface and slope of the waste slag accumulation body are repaired, and the surface drainage ditch 1 is excavated and constructed.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An anti-skid drainage system for large-scale waste accumulation in gullies, characterized by: The invention comprises an anti-slip interception system, an underground drainage system and a surface drainage ditch (1); the anti-slip interception system comprises a plurality of arch interception structures (2) symmetrically arranged along the gully center axis, a plurality of pile-type support structures and a pile-sheet wall (5) arranged at the end of the waste accumulation body downstream of the gully; the underground drainage system comprises a first drainage section (7) arranged along the outer arc surface of the arch interception structure (2), a water collection well (18) arranged in the gully center downstream of the arch interception structure (2), a plurality of second drainage sections (13) whose two ends are respectively connected to the first drainage section (7) and the water collection well (18), and a ditch core culvert (19) connected to the plurality of water collection wells (18) and the ditch outside the pile-sheet wall (5).

2. The anti-skid drainage system for large-scale waste accumulation in gullies according to claim 1, characterized in that: The arch-type intercepting structure (2) comprises an anti-slip tooth wall (3) and a pile-type arch seat (4) installed on the original ground of the gully; the outer arc surface of the anti-slip tooth wall (3) faces the upstream of the gully; and the pile-type arch seat (4) is arranged at both ends of the anti-slip tooth wall (3).

3. The anti-skid drainage system for large-scale waste accumulation in gullies according to claim 2, characterized in that: The lower part of the anti-slip tooth wall (3) is embedded below the original ground, and the anti-slip tooth wall (3) adopts a gravity retaining wall section; the foundation of the pile-type arch seat (4) is embedded in the bedrock.

4. The anti-skid drainage system for large-scale waste accumulation in a gully according to claim 1, characterized in that: The stack-type retaining structure is arranged along the normal direction of the gully center axis; the stack-type retaining structure comprises a plurality of anti-slip stacks (6), and the plurality of anti-slip stacks (6) are evenly distributed on the original ground of the gully; the foundations of the anti-slip stacks (6) are embedded in bedrock.

5. The anti-skid drainage system for large-scale waste accumulation in a gully according to claim 1 or 2, characterized in that: The first drainage section (7) is arranged closely to the wall surfaces of the anti-slip tooth wall (3) and the pile-type arch seat (4); the bottom of the first drainage section (7) is substantially parallel to the top surface of the arch-type intercepting structure (2).

6. The anti-skid drainage system for large-scale waste accumulation in gullies according to claim 5, characterized in that: The first drainage section (7) comprises a water collection ditch (8), an impermeable geotextile layer (9), a first permeable geotextile layer (10), a first graded crushed stone layer (11), and a drainage blind pipe (12); the water collection ditch (8) adopts a masonry structure; the ditch wall and the ditch bottom surface of the water collection ditch (8) are both covered with an impermeable geotextile layer (9); the drainage blind pipe (12) is installed in the water collection ditch (8); the first graded crushed stone layer (11) for covering the drainage blind pipe (12) is installed in the water collection ditch (8); and the first permeable geotextile layer (10) is installed on the top surface of the first graded crushed stone layer (11).

7. The anti-skid drainage system for large-scale waste accumulation in gullies according to claim 1, characterized in that: The second drainage section (13) comprises a ditch body (14), a cover plate (15), a second permeable geotextile layer (16), and a second graded crushed stone layer (17); the ditch body (14) of the second drainage section (13) is embedded below the original ground surface of the gully.

8. The anti-skid drainage system for large-scale waste accumulation in gullies according to claim 7, characterized in that: The ditch body (14) has an isosceles trapezoidal cross-section; seepage seams are provided between adjacent cover plates (15); a second graded crushed stone layer (17) is provided above the cover plates (15); and the periphery of the second graded crushed stone layer (17) is covered by a second water-permeable geotextile layer (16).

9. The anti-skid drainage system for large-scale waste accumulation in gullies according to claim 1, characterized in that: The culvert (19) comprises a trench opened at the bottom of the slope, wherein a concrete foundation (22) is provided at the bottom of the trench; a culvert (20) connected to a water collection well (18) is installed on the top surface of the concrete foundation (22); a third graded crushed stone layer (23) for covering the culvert (20) is provided in the trench, and a third permeable geotextile layer (24) is laid on the top surface of the third graded crushed stone layer (23).

10. The anti-skid drainage system for large-scale waste accumulation in gullies according to claim 9, characterized in that: The third graded gravel layer (23) is provided with permeable pipes (21) located on both sides of the culvert (20); the water outlet ends of the permeable pipes (21) are in communication with the water collection well (18).

11. The anti-skid drainage system for large-scale waste accumulation in a gully according to claim 1 or 10, characterized in that: The water collection well (18) is respectively connected to the culvert (20) of the ditch culvert (19) and the second drainage section (13).

12. A method for constructing an anti-skid drainage system for large-scale waste accumulation in a gully, characterized in that: The steps include: Clean the gully surface and measure and lay out the lines; Constructing a pile-board wall (5) at the end of the waste pile; Determine the planar position and height of the ditch culvert (19), the arch intercepting structure (2), and the water collection well (18); Excavate the gully section by section from the downstream to the upstream and construct a gully core culvert (19) and a water collection well (18). The water collection well (18) is reserved with a hole for connecting to the second drainage section (13); An arch-type intercepting structure (2) is constructed step by step from the downstream of the gully to the upstream. First, deep holes are excavated at both ends of the anti-slip tooth wall (3), and pile-type arch seats (4) are constructed. Then, the anti-slip tooth wall (3) is excavated and constructed. Excavate the outer arc surface of the arch intercepting structure (2) and construct the first drainage section (7); Excavating and constructing a second drainage section (13) between the end of the first drainage section (7) and the adjacent water collection well (18); Apply anti-slip piles (6); Backfill the waste and compact it to the required density; After the waste slag backfill is completed, the top surface and slope of the waste slag pile are repaired, and the surface drainage ditch is excavated and constructed (1).

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