Slope type waste slag yard drainage system and construction method

Abstract

The invention provides a slope type waste slag yard drainage system and a construction method, the drainage system comprises a surface drainage system, a shallow drainage system and a deep drainage system, the surface drainage system comprises an intercepting ditch and a plurality of riding tracks, the intercepting ditch is arranged around a slag yard side line, the riding tracks are arranged across the surface of a slag stacking body, and riding track drainage ditches are arranged on the inner sides of the riding tracks; the shallow drainage system comprises a plurality of deep drainage grooves and drainage blind ditches, and the deep drainage grooves are transversely and longitudinally arranged below the ground line of the waste slag field in a staggered mode; the deep drainage system comprises drainage holes, the drainage holes are formed below the lower limit of the strong weathering zone and are integrally distributed in a zigzag shape, and a plurality of deep drainage holes are formed in the drainage holes. Through the mode of combining a surface drainage system composed of an intercepting ditch and a riding track drainage ditch, a shallow drainage system composed of a deep intercepting drainage groove and a drainage blind ditch and a deep drainage system composed of a drainage hole and a deep drainage hole, the underground water level line can be efficiently and rapidly lowered, earth surface seepage water can be drained, and then the stability of a slag field is effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the field of environmental engineering, and in particular to a slope type waste dump drainage system and a construction method. Background Art

[0002] Large-scale civil engineering projects generally require the establishment of large-scale waste dumps. According to geological and topographical conditions, relative positions to the river channel, flood treatment methods and other factors, waste dumps can be divided into channel type, riverside type, slope type, flat type and reservoir type. Among them, for general slope type waste dumps, it is usually only necessary to consider the slope stability problem under heavy rain conditions. To this end, the general practice is to arrange horizontal and vertical surface drainage ditches on the surface of the waste dump after taking anti-slip measures at the end of the waste dump to reduce the impact of surface seepage on the slope of the waste dump, thereby ensuring the overall stability of the waste dump. However, for slope waste dumps with a relatively thick cover layer and a high groundwater level, it is difficult to discharge the seepage water in the slag pile in a short time under heavy rain conditions. In addition, the groundwater level is high, and underground water gushing and surface seepage can easily cause the slope of the waste dump to become unstable. Summary of the invention

[0003] The first object of the present invention is to provide a drainage system for a slope type waste dump in response to the above-mentioned problems.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A drainage system for a sloped waste dump, comprising a surface drainage system, a shallow drainage system and a deep drainage system, wherein the surface drainage system comprises an intercepting ditch and a plurality of horse paths, wherein the intercepting ditch is arranged around the edge of the waste dump, the horse paths are arranged across the surface of the waste dump, a horse path drainage ditch is arranged inside the horse paths, and both ends of the horse path drainage ditch are connected to the intercepting ditch;

[0006] The shallow drainage system includes a number of deep drainage grooves and drainage blind ditches. The deep drainage grooves are arranged horizontally and vertically below the surface line of the waste dump and above the lower limit of the full weathering zone. The deep drainage grooves are connected to the drainage blind ditches, and the ends of the deep drainage grooves are connected to the drainage steel pipes.

[0007] The deep drainage system includes a drainage hole, which is arranged below the lower limit of the strong weathering zone and is distributed in a zigzag shape as a whole. A number of deep drainage holes are arranged at intervals on the top arch and the upstream side of the drainage hole. A drainage channel is arranged at the entrance of the drainage hole, and the drainage channel is connected to the road ditch.

[0008] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0009] As a preferred technical solution of the present invention: a geotextile is arranged in the deep drainage ditch.

[0010] As a preferred technical solution of the present invention: the deep drainage ditch is provided with geotubes, graded crushed stone, geotubes, slag and fully weathered soil from bottom to top.

[0011] As a preferred technical solution of the present invention: the geotextile is wrapped around the geotube.

[0012] As a preferred technical solution of the present invention: the bottom of the drainage blind ditch is arranged from bottom to top in sequence with large stones, pebbles, geotextiles, and gravel layers.

[0013] As a preferred technical solution of the present invention: a sedimentation tank is arranged at the outlet of the drainage steel pipe.

[0014] As a preferred technical solution of the present invention: a bell mouth is arranged downstream of the sedimentation tank to be connected with the existing open channel or downstream river.

[0015] As a preferred technical solution of the present invention: the cross-sectional diameter of the drainage hole is 3-5m.

[0016] As a preferred technical solution of the present invention: a PE drainage flower pipe is provided in the deep drainage hole.

[0017] The second object of the present invention is to provide a construction method for a drainage system of a slope type waste dump.

[0018] To this end, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0019] A construction method for a slope type waste dump drainage system, the construction method is based on the drainage system as described above, and comprises the following steps:

[0020] S1: Construct intercepting ditches around the edge of the slag dump, and the intercepting ditches are made of reinforced concrete structure;

[0021] S2: After removing the mountain surface covering layer, the original gullies and open channels on the surface are converted into drainage blind ditches. Large stones, pebbles, and gravel are layered and compacted from bottom to top in the order of large stones, pebbles, and gravel to the designed elevation. In order to ensure the drainage effect of the blind ditch and prevent clogging by fine particles, a layer of geotextile is arranged between the pebble and gravel layers;

[0022] S3: A concrete slag retaining dam is built at the bottom of the slope of the waste dump. A drainage steel pipe is embedded in the dam body. A reinforced concrete sedimentation tank is set at the downstream outlet of the drainage steel pipe to precipitate fine particles in the slag seepage water. A bell mouth is set downstream of the sedimentation tank to connect with the existing open channel or downstream river channel to discharge the slag seepage water;

[0023] S4: First, remove the fully weathered layer at the deep horizontal and vertical intercepting and drainage trenches on the mountain surface, arrange geotubes at the bottom and wrap them with geotextiles, backfill crushed stone and slag inside the intercepting and drainage trenches, and wrap the bottom of the intercepting and drainage trenches with geotextiles. After the excavated platform at the top of the drainage trench is treated with geotubes wrapped with geotextiles and backfilled with slag, a layer of fully weathered soil is backfilled on the top and the slag is piled in the abandoned slag field in a layered rolling manner. The end of the drainage trench is effectively connected to the drainage steel pipe of the slag retaining dam;

[0024] S5: After the slag dump is piled to the designed elevation, a horseway is set on the surface, and a horseway drainage ditch is set inside the horseway to drain part of the natural slope precipitation;

[0025] S6: A zigzag drainage hole is excavated below the lower limit of strong weathering at the bottom of the slag dump. To meet the drainage needs of the drainage hole, the drainage hole is arranged along the slope. To save construction period, the drainage hole can be excavated by TBM method. The excavation section diameter is preferably 3-5m. Deep drainage holes are constructed in the drainage holes. PE drainage flower pipes are buried in the deep drainage holes and covered with geotextile. A drainage channel is excavated at the entrance of the drainage hole and led to the existing highway ditch for discharge.

[0026] The present invention provides a drainage system and construction method for a slope type waste dump, which have the following beneficial effects: by combining a surface drainage system consisting of an intercepting ditch and a horseway drainage ditch, a shallow drainage system consisting of a deep intercepting drainage trough and a drainage blind ditch, and a deep drainage system consisting of a drainage hole and a deep drainage hole, the groundwater level can be efficiently and quickly lowered and surface seepage water can be discharged, thereby effectively ensuring the stability of the waste dump; the construction sequence is reasonably arranged to meet the waste dump's slag stacking function as early as possible, saving construction time; at the same time, when the geotextile is aged or damaged, the arrangement of the deep drainage system also provides safety protection for the drainage of the entire waste dump, reducing the overall instability of the waste body and the risk of landslides. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a plan view of the drainage system for a slope type waste dump provided by the present invention.

[0028] Figure 2 It is a longitudinal section of the deep drainage ditch and horseway drainage ditch.

[0029] Figure 3 This is a longitudinal section of the drainage hole.

[0030] Figure 4 This is a cross-sectional view of a deep drainage ditch.

[0031] Figure 5 This is a cross-sectional view of a drainage blind ditch.

[0032] In the figure: 1-intercepting ditch; 2-horseway drainage ditch; 3-deep intercepting drainage trough; 4-drainage blind ditch; 5-drainage hole; 6-drainage steel pipe; 7-sedimentation tank; 8-trumpet; 31-geotextile; 32-geotube; 33-graded crushed stone; 34-slag; 35-fully weathered soil; 41-large stone; 42-pebble; 43-geotextile; 44-sand and gravel layer; 51-drainage hole opening; 52-deep drainage hole. DETAILED DESCRIPTION

[0033] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1-5 As shown, a drainage system for a slope type waste dump includes a surface drainage system, a shallow drainage system and a deep drainage system. The surface drainage system includes an intercepting ditch 1 and a plurality of horse paths. The intercepting ditch 1 is arranged around the edge of the dump. The horse path is arranged across the surface of the slag pile. A horse path drainage ditch 2 is arranged inside the horse path to drain surface seepage water. Both ends of the horse path drainage ditch 2 are connected to the intercepting ditch 1.

[0035] The shallow drainage system includes a number of deep drainage grooves 3 and drainage blind ditches 4. The deep drainage grooves 3 are arranged in a staggered manner below the ground line of the waste dump and above the lower limit of the full weathering zone. The deep drainage grooves 3 are connected to the drainage blind ditches 4. A slag retaining dam is built at the bottom of the slope of the waste dump to enhance the anti-sliding stability of the slag body. A drainage steel pipe 6 is pre-buried downstream of the slag retaining dam, and the end of the deep drainage groove 3 is connected to the drainage steel pipe 6;

[0036] The deep drainage system includes a drainage hole 5, which is arranged below the lower limit of the strong weathering zone and is distributed in a zigzag shape as a whole. A number of deep drainage holes 52 are arranged at intervals on the top arch and the upstream side of the drainage hole 5. The interval between two adjacent deep drainage holes 52 is 6m. A drainage channel is arranged at the drainage hole entrance 51, and the drainage channel is connected to the road ditch.

[0037] A geotextile 31 is arranged in the deep drainage ditch 3 .

[0038] The deep drainage ditch is provided with geotube 32, graded crushed stone 33, geotube 32, slag 34, and fully weathered soil 35 from bottom to top.

[0039] The geotextile is wrapped around the geotube 32 to filter fine particles on the surface of the slag and prevent the geotube from being blocked.

[0040] The drainage blind ditch 4 is constructed from the original drainage gully and open channel. The bottom of the drainage blind ditch 4 is arranged with large stones 41, pebbles 42, geotextile 43, and gravel layer 44 from bottom to top.

[0041] A sedimentation tank 7 is arranged at the outlet of the drainage steel pipe 6 to precipitate fine particles in the seepage water of the slag body.

[0042] A bell mouth 8 is arranged downstream of the sedimentation tank 7 to connect with the existing open channel or downstream river channel to discharge the slag seepage water.

[0043] The cross-sectional diameter of drainage hole 5 is 3-5m.

[0044] A PE drainage flower pipe is arranged in the deep drainage hole 52 and is covered with a geotextile to filter fine particles on the surface of the slag.

[0045] In order to achieve rapid drainage and meet the requirements of slag dumping function, deep drainage ditch 3 and water blind ditch 4 are constructed on the surface of the slag dump mountain after removing the covering layer. After the construction is completed, the slag dump can be started. At the same time, drainage hole 5 is excavated and deep drainage hole 52 is constructed. After the slag is piled to the designed elevation, a horseway and horseway drainage ditch 2 are set on the slope.

[0046] The arrangement of the deep drainage system also provides a safety guarantee for the drainage of the entire slag dump. This is mainly because once the geotextile in the horizontally and vertically crisscrossed intercepting and drainage grooves 3 in the shallow drainage system is aged or damaged during use, the drainage process in the intercepting and drainage grooves 3 will carry away the fine particles in the slag body, which may easily lead to the overall instability of the slag body and cause landslides.

[0047] Specifically, the above-mentioned slope type waste dump drainage system is implemented through the following steps:

[0048] S1: Construct intercepting ditches around the edge of the slag dump, and the intercepting ditches are made of reinforced concrete structure;

[0049] S2: After removing the mountain surface covering layer, the original gullies and open channels on the surface are converted into drainage blind ditches. Large stones, pebbles, and gravel are layered and compacted from bottom to top in the order of large stones, pebbles, and gravel to the designed elevation. In order to ensure the drainage effect of the blind ditch and prevent clogging by fine particles, a layer of geotextile is arranged between the pebble and gravel layers;

[0050] S3: A concrete slag retaining dam is built at the bottom of the slope of the waste dump. A drainage steel pipe is embedded in the dam body. A reinforced concrete sedimentation tank is set at the downstream outlet of the drainage steel pipe to precipitate fine particles in the slag seepage water. A bell mouth is set downstream of the sedimentation tank to connect with the existing open channel or downstream river channel to discharge the slag seepage water;

[0051] S4: First, remove the fully weathered layer at the deep horizontal and vertical intercepting and drainage trenches on the mountain surface, arrange geotubes at the bottom and wrap them with geotextiles, backfill crushed stone and slag inside the intercepting and drainage trenches, and wrap the bottom of the intercepting and drainage trenches with geotextiles. After the excavated platform at the top of the drainage trench is treated with geotubes wrapped with geotextiles and backfilled with slag, a layer of fully weathered soil is backfilled on the top and the slag is piled in the abandoned slag field in a layered rolling manner. The end of the drainage trench is effectively connected to the drainage steel pipe of the slag retaining dam;

[0052] S5: After the slag dump is piled to the designed elevation, a horseway is set on the surface, and a horseway drainage ditch is set inside the horseway to drain part of the natural slope precipitation;

[0053] S6: A zigzag drainage hole is excavated below the lower limit of strong weathering at the bottom of the slag dump. To meet the drainage needs of the drainage hole, the drainage hole is arranged along the slope. To save construction period, the drainage hole can be excavated by TBM method. The excavation section diameter is preferably 3-5m. Deep drainage holes are constructed in the drainage holes. PE drainage flower pipes are buried in the deep drainage holes and covered with geotextile. A drainage channel is excavated at the entrance of the drainage hole and led to the existing highway ditch for discharge.

[0054] The above-mentioned specific implementation methods are used to explain the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent substitutions, improvements, etc. made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A drainage system for a slope type waste dump, characterized by: It comprises a surface drainage system, a shallow drainage system and a deep drainage system. The surface drainage system comprises an intercepting ditch (1) and a plurality of horseways. The intercepting ditch (1) is arranged around the edge of the slag yard. The horseway is arranged across the surface of the slag pile. A horseway drainage ditch (2) is arranged inside the horseway. Both ends of the horseway drainage ditch (2) are connected to the intercepting ditch (1). The shallow drainage system comprises a plurality of deep drainage grooves (3) and drainage blind ditches (4). The deep drainage grooves (3) are arranged in a staggered manner below the surface line of the waste dump and above the lower limit of the full weathering zone. The deep drainage grooves (3) are connected to the drainage blind ditches (4), and the ends of the deep drainage grooves (3) are connected to the drainage steel pipes (6). The deep drainage system comprises a drainage hole (5), which is arranged below the lower limit of the strong weathering zone and is distributed in a zigzag shape as a whole. A plurality of deep drainage holes (52) are arranged at intervals in the top arch and the upstream side of the drainage hole (5). A drainage channel is arranged at the hole opening (51) of the drainage hole, and the drainage channel is connected to the road ditch.

2. The drainage system for a slope type waste dump according to claim 1 is characterized by: A geotextile (31) is arranged in the deep drainage ditch (3).

3. The drainage system for a slope type waste dump according to claim 1 is characterized in that: The deep drainage ditch is provided with a geotube (32), graded crushed stone (33), a geotube (32), slag (34), and fully weathered soil (35) in sequence from bottom to top.

4. The drainage system for a slope type waste dump according to claim 3 is characterized in that: The geotextile tube (32) is wrapped with a geotextile.

5. The drainage system for a slope type waste dump according to claim 1 is characterized in that: The bottom of the blind drainage ditch (4) is arranged in sequence from bottom to top with large stones (41), pebbles (42), geotextile (43), and a gravel layer (44).

6. The drainage system for a slope type waste dump according to claim 1 is characterized by: A sedimentation tank (7) is arranged at the outlet of the drainage steel pipe (6).

7. The drainage system for a slope type waste dump according to claim 6 is characterized by: A bell mouth (8) is arranged downstream of the sedimentation tank (7) to connect with the existing open channel or downstream river.

8. The drainage system for a slope type waste dump according to claim 1 is characterized by: The cross-sectional diameter of the drainage hole (5) is 3-5m.

9. The drainage system for a slope type waste dump according to claim 1 is characterized by: A PE drainage flower pipe is arranged in the deep drainage hole (52).

10. A construction method for a slope type waste dump drainage system, characterized in that: The construction method is based on the system according to any one of claims 1 to 9 and comprises the following steps: S1: Construct intercepting ditches around the edge of the slag dump, and the intercepting ditches are made of reinforced concrete structure; S2: After removing the mountain surface covering layer, the original gullies and open channels on the surface are converted into drainage blind ditches. Large stones, pebbles, and gravel are layered and compacted from bottom to top in the order of large stones, pebbles, and gravel to the designed elevation. In order to ensure the drainage effect of the blind ditch and prevent clogging by fine particles, a layer of geotextile is arranged between the pebble and gravel layers; S3: A concrete slag retaining dam is built at the bottom of the slope of the waste dump. A drainage steel pipe is embedded in the dam body. A reinforced concrete sedimentation tank is set at the downstream outlet of the drainage steel pipe to precipitate fine particles in the slag seepage water. A bell mouth is set downstream of the sedimentation tank to connect with the existing open channel or downstream river channel to discharge the slag seepage water; S4: First, remove the fully weathered layer at the deep horizontal and vertical intercepting and drainage trenches on the mountain surface, arrange geotubes at the bottom and wrap them with geotextiles, backfill crushed stone and slag inside the intercepting and drainage trenches, and wrap the bottom of the intercepting and drainage trenches with geotextiles. After the excavated platform at the top of the drainage trench is treated with geotubes wrapped with geotextiles and backfilled with slag, a layer of fully weathered soil is backfilled on the top and the slag is piled in the abandoned slag field in a layered rolling manner. The end of the drainage trench is effectively connected to the drainage steel pipe of the slag retaining dam; S5: After the slag dump is piled to the designed elevation, a horseway is set on the surface, and a horseway drainage ditch is set inside the horseway to drain part of the natural slope precipitation; S6: A zigzag drainage hole is excavated below the lower limit of strong weathering at the bottom of the slag dump. To meet the drainage needs of the drainage hole, the drainage hole is arranged along the slope. To save construction period, the drainage hole can be excavated by TBM method. The excavation section diameter is preferably 3-5m. Deep drainage holes are constructed in the drainage holes. PE drainage flower pipes are buried in the deep drainage holes and covered with geotextile. A drainage channel is excavated at the entrance of the drainage hole and led to the existing highway ditch for discharge.

Images