Shallow dish-shaped flexible drainage structure for backfill area

Abstract

The utility model discloses a shallow-dish-shaped flexible drainage structure for a backfill area, which comprises a ditch, the section of the ditch is shallow-dish-shaped, the ditch is excavated on the plane road side or the slope toe of the backfill area, the longitudinal slope of the ditch is not less than 0.5%, mixed soil is paved on the inner wall of the ditch, and a cement blanket is paved above the mixed soil. A plurality of cement blankets are sequentially laid in the length extending direction of the ditch, the cement blankets and the mixed soil form a flexible drainage structure, and the flexible drainage structure horizontally extends towards the two sides of the shallow dish-shaped section. The drainage structure solves the problems that an existing drainage structure is uneven in settlement and poor in drainage effect on a backfill area.

Description

Technical Field

[0001] This utility model belongs to the field of drainage structure technology, specifically relating to a shallow dish-shaped flexible drainage structure for backfill areas. Background Technology

[0002] Coal mining generates a large amount of industrial solid waste, such as coal gangue and fly ash. Currently, the most effective treatment for bulk industrial solid waste is comprehensive landfill disposal. Each mine needs to construct corresponding storage sites for the transfer and landfilling of solid waste. During coal mining, local areas develop goafs and subsidence pits, requiring backfilling. Therefore, landfills and land reclamation sites are common in mining areas. In landfills, loose backfill materials are compacted and stored, with the exposed surfaces consisting of artificially constructed graded slopes. The highest site has up to 10 graded slopes, with a total height of up to 100 meters. The site drainage structure is extremely important for improving site stability, reducing slope erosion, and maintaining vegetation growth.

[0003] During open-pit mining, a large amount of overburden is generated. The overburden backfill area occupies a large area of ​​land in the open-pit mine. Therefore, some long-distance civil engineering projects are inevitably built in the backfill area, such as road projects and belt conveyor projects in the open-pit mine. The entire line is located in the open-pit mine backfill area. Traditional drainage structures are poorly adapted and drainage is inadequate. Rainwater infiltration will aggravate the uneven settlement of the foundation in the backfill area, which will affect the road conditions and affect driving comfort and safety.

[0004] Traditional drainage ditches are mostly masonry structures, often employing trapezoidal or rectangular cross-sections with relatively high water flow capacity. However, uneven settlement exists in backfill areas such as open-pit mine backfill areas, land reclamation sites, and high-fill slopes. If traditional masonry drainage ditches are still used, the uneven settlement of the backfill area can easily cause cracking, misalignment, or even collapse of the drainage ditches, severely affecting their drainage function and leading to a series of water-related problems that threaten the ecological environment and safe production of the mining area. Furthermore, masonry drainage ditches are mostly made of concrete or masonry rubble masonry, resulting in long construction periods, high costs, and high maintenance costs in the later stages. Utility Model Content

[0005] The purpose of this invention is to provide a shallow, dish-shaped flexible drainage structure for backfill areas, which solves the problems of uneven settlement and poor drainage effect of traditional drainage structures in backfill areas.

[0006] The technical solution adopted in this utility model is a shallow saucer-shaped flexible drainage structure for backfill areas, including a ditch. The ditch has a shallow saucer-shaped cross-section. The ditch is excavated on the side of the road or the toe of the slope in the backfill area. The longitudinal slope of the ditch is not less than 5‰. The inner wall of the ditch is lined with mixed soil. A cement blanket is laid on top of the mixed soil. Several cement blankets are laid sequentially along the length of the ditch. The cement blankets and mixed soil constitute a flexible drainage structure. The flexible drainage structure is fixed after extending horizontally a certain distance to both sides of the shallow saucer-shaped cross-section in the backfill area.

[0007] The feature of this utility model is that,

[0008] The cement blanket located at the edge of the flexible drainage structure is buried in the plane of the backfill area to a depth of not less than 5cm. It is fixed with rivets. After fixing, the surface flatness is adjusted, and cement slurry is brushed onto the upper surface of the cement blanket.

[0009] At the junction of two adjacent cement blankets, the cement blanket located upstream presses on the cement blanket located downstream, and the two adjacent cement blankets are fixed with several screws.

[0010] The flexible drainage structure extends outwards from both sides of the shallow saucer-shaped cross-section by at least 10cm.

[0011] The overlap width of two adjacent cement blankets upstream and downstream should not be less than 10cm, and sealant or plain cement should be evenly applied at the joint.

[0012] The mixed soil is laid with a thickness of 10cm along the shallow saucer-shaped cross section.

[0013] The cement blanket is laid along the shallow saucer-shaped cross section with a thickness of 10mm.

[0014] The cement blanket is a three-dimensional fiber composite soft material woven from polyethylene and polypropylene filaments. The bottom of the three-dimensional fiber composite soft material is covered with a backing made of polyvinyl chloride or rubber.

[0015] The mixed soil is made by mixing cement, fly ash, and soil in a volume ratio of 3:17:80.

[0016] The beneficial effects of this utility model are that the shallow saucer-shaped flexible drainage structure used in backfill areas reduces the depth-to-width ratio of the drainage ditch, which is beneficial to the safety of large vehicles; the flexible structural layer has strong adaptability to foundation deformation, simple structure, high stability and good drainage effect, and is suitable for open-pit mine backfill areas, land reclamation sites and high fill slopes. It is also easy to construct and maintain, and has a low cost, making it of great value for promotion and application. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the shallow dish-shaped flexible drainage structure of this utility model for backfill areas;

[0018] In the diagram, 1. Cement blanket, 2. Mixed soil, 3. Plan view of backfill area. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] Example 1

[0021] The present invention provides a shallow dish-shaped flexible drainage structure for backfill areas, the structure of which is as follows: Figure 1 As shown, the structure includes a ditch with a shallow saucer-shaped cross-section. The ditch is excavated on the side of the backfill area plane 3 or at the toe of the slope. The longitudinal slope of the ditch is not less than 5‰. The inner wall of the ditch is lined with mixed soil 2, and a cement blanket 1 is laid on top of the mixed soil 2. Several cement blankets 1 are laid sequentially along the length of the ditch. The cement blankets 1 and the mixed soil 2 form a flexible drainage structure. The flexible drainage structure is fixed after extending horizontally a certain distance to both sides of the shallow saucer-shaped cross-section backfill area plane 3.

[0022] Example 2

[0023] This utility model provides a shallow saucer-shaped flexible drainage structure for backfill areas, comprising a ditch with a shallow saucer-shaped cross-section. The ditch is excavated on the side of the backfill area plane 3 or at the toe of the slope, with a longitudinal slope of not less than 5‰. The inner wall of the ditch is lined with mixed soil 2, and a cement blanket 1 is laid on top of the mixed soil 2. Several cement blankets 1 are laid sequentially along the length of the ditch. The cement blankets 1 and the mixed soil 2 constitute a flexible drainage structure. The flexible drainage structure extends horizontally to both sides of the shallow saucer-shaped cross-section of the backfill area plane 3 and is then fixed. Based on Embodiment 1, in this embodiment, the cement blanket 1 located at the edge of the flexible drainage structure is buried in the backfill area plane 3 to a depth of not less than 5cm and fixed with rivets. After fixing, the surface flatness is adjusted, and cement slurry is brushed onto the upper surface of the cement blanket 1.

[0024] Example 3

[0025] This utility model provides a shallow saucer-shaped flexible drainage structure for backfill areas, comprising a ditch with a shallow saucer-shaped cross-section. The ditch is excavated on the side of the backfill area plane 3 or at the toe of the slope, with a longitudinal slope of not less than 5‰. The inner wall of the ditch is lined with mixed soil 2, and a cement blanket 1 is laid on top of the mixed soil 2. Several cement blankets 1 are laid sequentially along the length of the ditch. The cement blankets 1 and the mixed soil 2 constitute a flexible drainage structure. The flexible drainage structure extends horizontally a certain distance towards both sides of the shallow saucer-shaped cross-section of the backfill area plane 3 and is then fixed. The cement blankets 1 located at the edge of the flexible drainage structure are buried in the backfill area plane 3 to a depth of not less than 5cm and are fixed with rivets. After fixing, the surface flatness is adjusted, and cement slurry is brushed onto the upper surface of the cement blankets 1. Based on embodiment 2, in this embodiment, at the junction of two adjacent cement blankets 1, the upstream cement blanket presses on the downstream cement blanket 1, and several screws are used to fix the two adjacent cement blankets 1.

[0026] Example 4

[0027] This utility model provides a shallow saucer-shaped flexible drainage structure for backfill areas, comprising a ditch with a shallow saucer-shaped cross-section. The ditch is excavated on the side of the backfill area plane 3 or at the toe of the slope, with a longitudinal slope of not less than 5‰. The inner wall of the ditch is lined with mixed soil 2, and a cement blanket 1 is laid on top of the mixed soil 2. Several cement blankets 1 are laid sequentially along the length of the ditch. The cement blankets 1 and the mixed soil 2 constitute a flexible drainage structure. The flexible drainage structure extends horizontally a certain distance towards both sides of the shallow saucer-shaped cross-section of the backfill area plane 3 before being fixed. The cement blankets 1 located at the edge of the flexible drainage structure are buried in the backfill area plane 3 to a depth of not less than 5cm and are fixed with rivets. After fixing, the surface flatness is adjusted, and cement slurry is brushed onto the upper surface of the cement blankets 1. At the junction of two adjacent cement blankets 1, the upstream cement blanket presses on the downstream cement blanket 1, and the two adjacent cement blankets 1 are fixed with several screws. Based on embodiment 3, in this embodiment, the flexible drainage structure extends outward by not less than 10cm from the edges of the shallow saucer-shaped cross-section.

[0028] Example 5

[0029] This utility model provides a shallow saucer-shaped flexible drainage structure for backfill areas, comprising a ditch with a shallow saucer-shaped cross-section. The ditch is excavated on the side of the backfill area plane 3 or at the toe of the slope, with a longitudinal slope of not less than 5‰. The inner wall of the ditch is lined with mixed soil 2, and a cement blanket 1 is laid on top of the mixed soil 2. Several cement blankets 1 are laid sequentially along the length of the ditch. The cement blankets 1 and the mixed soil 2 constitute a flexible drainage structure. The flexible drainage structure extends horizontally a certain distance towards both sides of the shallow saucer-shaped cross-section of the backfill area plane 3 and is then fixed. The cement blankets 1 located at the edge of the flexible drainage structure are buried in the backfill area plane 3 to a depth of not less than 5cm and are fixed with rivets. After fixing, the surface flatness is adjusted, and cement slurry is brushed onto the upper surface of the cement blankets 1. At the junction of two adjacent cement blankets 1, the upstream cement blanket presses down on the downstream cement blanket 1, and the two adjacent cement blankets 1 are fixed with several screws. The flexible drainage structure extends outwards by not less than 10cm from the edges of the shallow saucer-shaped cross-section. Based on Example 4, in this example, the overlap width of two adjacent cement blankets 1 upstream and downstream is not less than 10cm, and sealant or plain ash is evenly applied at the joint.

[0030] Example 6

[0031] This utility model provides a shallow saucer-shaped flexible drainage structure for backfill areas, comprising a ditch with a shallow saucer-shaped cross-section. The ditch is excavated on the side of the backfill area plane 3 or at the toe of the slope, with a longitudinal slope of not less than 5‰. The inner wall of the ditch is lined with mixed soil 2, and a cement blanket 1 is laid on top of the mixed soil 2. Several cement blankets 1 are laid sequentially along the length of the ditch. The cement blankets 1 and the mixed soil 2 constitute a flexible drainage structure. The flexible drainage structure extends horizontally a certain distance towards both sides of the shallow saucer-shaped cross-section of the backfill area plane 3 and is then fixed. The cement blankets 1 located at the edge of the flexible drainage structure are buried in the backfill area plane 3 to a depth of not less than 5cm and are fixed with rivets. After fixing, the surface flatness is adjusted, and cement slurry is brushed onto the upper surface of the cement blankets 1. At the junction of two adjacent cement blankets 1, the upstream cement blanket presses down on the downstream cement blanket 1, and the two adjacent cement blankets 1 are fixed with several screws. The flexible drainage structure extends outwards by not less than 10cm from the edges of the shallow saucer-shaped cross-section. The overlap width of two adjacent cement blankets 1 upstream and downstream shall not be less than 10cm, and sealant or mortar shall be evenly applied at the joint. Based on Example 5, in this example, the mixed soil 2 is laid with a thickness of 10cm along the shallow saucer-shaped cross-section. The cement blanket 1 is laid with a thickness of 10mm along the shallow saucer-shaped cross-section.

[0032] Example 7

[0033] This utility model provides a shallow saucer-shaped flexible drainage structure for backfill areas, comprising a ditch with a shallow saucer-shaped cross-section. The ditch is excavated on the side of the backfill area plane 3 or at the toe of the slope, with a longitudinal slope of not less than 5‰. The inner wall of the ditch is lined with mixed soil 2, and a cement blanket 1 is laid on top of the mixed soil 2. Several cement blankets 1 are laid sequentially along the length of the ditch. The cement blankets 1 and the mixed soil 2 constitute a flexible drainage structure. The flexible drainage structure extends horizontally a certain distance towards both sides of the shallow saucer-shaped cross-section of the backfill area plane 3 and is then fixed. The cement blankets 1 located at the edge of the flexible drainage structure are buried in the backfill area plane 3 to a depth of not less than 5cm and are fixed with rivets. After fixing, the surface flatness is adjusted, and cement slurry is brushed onto the upper surface of the cement blankets 1. At the junction of two adjacent cement blankets 1, the upstream cement blanket presses down on the downstream cement blanket 1, and the two adjacent cement blankets 1 are fixed with several screws. The flexible drainage structure extends outwards by not less than 10cm from the edges of the shallow saucer-shaped cross-section. The overlap width of two adjacent cement blankets 1 upstream and downstream shall not be less than 10cm, and sealant or mortar shall be evenly applied at the joint. The mixed soil 2 shall be laid with a thickness of 10cm along the shallow saucer-shaped cross-section. The cement blanket 1 shall be laid with a thickness of 10mm along the shallow saucer-shaped cross-section. Based on Example 6, in this example, the cement blanket 1 is a three-dimensional fiber composite soft material woven from polyethylene and polypropylene filaments. The bottom of the three-dimensional fiber composite soft material is covered with a backing made of polyvinyl chloride (PVC).

[0034] Example 8

[0035] This utility model provides a shallow saucer-shaped flexible drainage structure for backfill areas, comprising a ditch with a shallow saucer-shaped cross-section. The ditch is excavated on the side of the backfill area plane 3 or at the toe of the slope, with a longitudinal slope of not less than 5‰. The inner wall of the ditch is lined with mixed soil 2, and a cement blanket 1 is laid on top of the mixed soil 2. Several cement blankets 1 are laid sequentially along the length of the ditch. The cement blankets 1 and the mixed soil 2 constitute a flexible drainage structure. The flexible drainage structure extends horizontally a certain distance towards both sides of the shallow saucer-shaped cross-section of the backfill area plane 3 and is then fixed. The cement blankets 1 located at the edge of the flexible drainage structure are buried in the backfill area plane 3 to a depth of not less than 5cm and are fixed with rivets. After fixing, the surface flatness is adjusted, and cement slurry is brushed onto the upper surface of the cement blankets 1. At the junction of two adjacent cement blankets 1, the upstream cement blanket presses down on the downstream cement blanket 1, and the two adjacent cement blankets 1 are fixed with several screws. The flexible drainage structure extends outwards by not less than 10cm from the edges of the shallow saucer-shaped cross-section. The overlap width of two adjacent cement blankets 1 upstream and downstream shall not be less than 10cm, and sealant or plain mortar shall be evenly applied at the joint. The mixed soil 2 shall be laid with a thickness of 10cm along the shallow saucer-shaped cross-section. The cement blanket 1 shall be laid with a thickness of 10mm along the shallow saucer-shaped cross-section. The cement blanket 1 is a three-dimensional fiber composite soft material woven from polyethylene and polypropylene filaments, and the bottom of the three-dimensional fiber composite soft material is covered with a lining made of rubber material. Based on Example 7, in this example, the mixed soil 2 is made of cement, fly ash, and soil, and the cement, fly ash, and soil are mixed in a volume ratio of 3:17:80. The fly ash is sourced from local mining areas and waste materials. The utilization of fly ash can reduce project costs and further enhance seepage prevention capacity while utilizing solid waste.

[0036] The shallow saucer-shaped cross-section is designed based on the land width and water volume. The net depth of the shallow saucer-shaped ditch is 30cm–50cm, and the net opening width is 2m, reducing the depth-to-width ratio of the drainage ditch and improving the safety of vehicles and pedestrians. A slope platform at least 1m wide is constructed on the toe side of the shallow saucer-shaped ditch, with a slope ratio of 1: n , n ≥1.5 means that the slope ratio is not steeper than 1:1.5, and it is used for greening.

[0037] The working principle of this utility model for a shallow saucer-shaped flexible drainage structure in backfill areas is as follows: the longitudinal slope of the shallow saucer-shaped ditch is set at not less than 5‰ to ensure smooth water flow downstream or to both sides; mixed soil 2 is laid on the lower layer of the ditch to form the base layer of the flexible drainage structure; cement blanket 1 is laid on the upper layer of mixed soil 2 to form the surface layer of the flexible drainage structure. The flexible drainage structure has excellent waterproof performance, and the use of composite structural layer materials ensures that rainwater does not seep in. The material properties meet the requirements of crack resistance and waterproofing of drainage structures on backfill, greatly improving the service life of drainage structures, thereby improving the stability of roadbeds and slopes, and exhibiting strong adaptability to uneven settlement of the foundation.

[0038] When constructing a shallow saucer-shaped flexible drainage structure in a backfill area, the backfill area plane 3 is first compacted, with the backfill material in plane 3 having a compaction degree of not less than 90%. A shallow saucer-shaped ditch is excavated on plane 3, and the inner wall of the ditch is compacted. The sides of the shallow saucer-shaped ditch are level, and the inner slope of the ditch must be free of loose soil and voids. Cement blanket 1 and mixed soil 2 are laid according to the shallow saucer-shaped cross-section. During rainfall, rainwater in the backfill area collects in the shallow saucer-shaped ditch set up on the roadside or at the toe of the slope, which then connects to downstream drainage facilities to guide the rainwater outside the road and site area.

[0039] This utility model relates to a shallow saucer-shaped flexible drainage structure for backfill areas. It combines a shallow saucer-shaped ditch with a flexible drainage structure layer, adapting to the drainage needs of roads and land reclamation sites in backfill areas. This drainage structure is mainly used for roadside drainage of surface water or slope toe drainage of slope surface water. It can adapt to foundation deformation, is easy to construct and maintain, and is simple and cost-effective to construct. This structure has been applied in actual engineering projects. By laying the flexible drainage structure in a shallow saucer-shaped cross-section, it improves adaptability to uneven foundation settlement, and its operational performance is excellent.

Claims

1. A shallow, dish-shaped flexible drainage structure for backfill areas, characterized in that, Including ditches, the ditches have a shallow saucer-shaped cross section. The ditches are excavated on the side of the backfill area plane (3). The longitudinal slope of the ditches is not less than 5‰. The inner wall of the ditches is covered with mixed soil (2). A cement blanket (1) is laid on top of the mixed soil (2). Several cement blankets (1) are laid in sequence along the extension direction of the ditches. The cement blankets (1) and the mixed soil (2) constitute a flexible drainage structure. The flexible drainage structure extends horizontally to the backfill area plane (3) on both sides of the shallow saucer-shaped cross section.

2. The shallow dish-shaped flexible drainage structure for backfill areas according to claim 1, characterized in that, The cement blanket (1) located at the edge of the flexible drainage structure is buried in the backfill area plane (3) with a burial depth of not less than 5cm. It is fixed with rivets. After fixing, the surface flatness is adjusted. Cement slurry is brushed onto the upper surface of the cement blanket (1).

3. The shallow dish-shaped flexible drainage structure for backfill areas according to claim 2, characterized in that, At the junction of two adjacent cement blankets (1), the cement blanket located upstream presses on the cement blanket located downstream (1), and the two adjacent cement blankets (1) are fixed with several screws.

4. The shallow dish-shaped flexible drainage structure for backfill areas according to claim 3, characterized in that, The flexible drainage structure extends outwards from both sides of the shallow saucer-shaped cross-section by at least 10cm.

5. The shallow dish-shaped flexible drainage structure for backfill areas according to claim 4, characterized in that, The overlap width of two adjacent cement blankets (1) upstream and downstream shall not be less than 10cm, and sealant or plain ash shall be applied evenly at the joint.

6. The shallow dish-shaped flexible drainage structure for backfill areas according to claim 5, characterized in that, Mixed soil (2) is laid along the shallow saucer-shaped cross section with a thickness of 10cm.

7. The shallow dish-shaped flexible drainage structure for backfill areas according to claim 6, characterized in that, Cement blanket (1) is laid along the shallow saucer-shaped cross section with a thickness of 10mm.

8. The shallow dish-shaped flexible drainage structure for backfill areas according to claim 7, characterized in that, Cement blanket (1) is a three-dimensional fiber composite soft material woven from polyethylene and polypropylene filaments. The bottom of the three-dimensional fiber composite soft material is covered with a lining made of polyvinyl chloride or rubber.

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