Slope type waste slag yard drainage system

Abstract

The utility model provides a slope type waste slag yard drainage system which comprises a surface layer drainage system, a shallow layer drainage system and a deep layer drainage system, the surface layer drainage system comprises an intercepting ditch and a plurality of riding tracks, the intercepting ditch is arranged on the periphery of a slag yard side line, the riding tracks stretch 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] This utility model relates to the field of environmental engineering, specifically to a drainage system for a slope-type spoil disposal site. Background Technology

[0002] Large-scale civil engineering projects typically require large spoil heaps. Based on geological and topographical conditions, their relative location to rivers, and flood control methods, spoil heaps can be categorized into gully-type, riverside-type, sloping-type, flat-type, and reservoir-type. For typical sloping-type spoil heaps, only slope stability under heavy rainfall conditions needs to be considered. Therefore, the common practice is to implement anti-sliding measures at the end of the spoil heap and then construct a crisscrossing surface drainage system to reduce the impact of surface seepage on the slopes, thus ensuring the overall stability of the spoil heap. However, for sloping spoil heaps with deep overburden and high groundwater levels, seepage within the spoil heap is difficult to drain quickly under heavy rainfall conditions. Combined with the high groundwater level, groundwater inrush and surface seepage can easily lead to slope instability. Utility Model Content

[0003] The main purpose of this utility model is to provide a drainage system for sloping spoil disposal sites, which is expected to effectively solve the problems in the background art.

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

[0005] A drainage system for a sloping spoil heap includes a surface drainage system, a shallow drainage system, and a deep drainage system. The surface drainage system includes intercepting ditches and several walkways. The intercepting ditches are set around the edge of the spoil heap. The walkways are set across the surface of the spoil heap. A walkway drainage ditch is provided on the inner side of the walkway. Both ends of the walkway drainage ditch are connected to the intercepting ditches.

[0006] The shallow drainage system includes several deep intercepting drainage channels and drainage blind ditches. The deep intercepting drainage channels are arranged in a crisscross pattern below the ground line of the spoil disposal site and above the lower limit of the fully weathered zone. The deep intercepting drainage channels are connected to the drainage blind ditches, and the ends of the deep intercepting drainage channels are connected to drainage steel pipes.

[0007] The deep drainage system includes drainage tunnels located below the lower limit of the strong weathering zone, arranged in a zigzag pattern. The drainage tunnels have several deep drainage holes spaced at intervals on the inner arch and upstream side. The drainage tunnel openings are equipped with drainage channels that connect to the roadside ditch.

[0008] While adopting the above technical solutions, this utility model may also adopt or combine the following technical solutions:

[0009] As a preferred technical solution of this utility model: a first geotextile is provided inside the deep drainage trench.

[0010] As a preferred technical solution of this utility model: the deep drainage trench is arranged from bottom to top as follows: geotextile pipe, graded crushed stone, geotextile pipe, stone chips, and completely weathered soil.

[0011] As a preferred technical solution of this utility model: geotextile is wrapped around the geotextile pipe.

[0012] As a preferred technical solution of this utility model: the bottom of the drainage blind ditch is arranged from bottom to top as large stones, pebbles, a second geotextile, and a gravel layer.

[0013] As a preferred technical solution of this utility model: a sedimentation tank is provided at the outlet of the drainage steel pipe.

[0014] As a preferred technical solution of this utility model: a funnel-shaped opening is provided at the downstream of the sedimentation tank, which is connected to the existing open channel or downstream river.

[0015] As a preferred technical solution of this utility model, the diameter of the drainage hole cross section is 3-5 m.

[0016] As a preferred technical solution of this utility model: a PE drainage pipe is provided inside the deep drainage hole.

[0017] This utility model provides a drainage system and construction method for a slope-type spoil heap, which has the following beneficial effects: By combining a surface drainage system consisting of intercepting ditches and walkway drainage ditches, a shallow drainage system consisting of deep intercepting drainage channels and drainage blind ditches, and a deep drainage system consisting of drainage holes and deep drainage holes, the groundwater level can be lowered efficiently and quickly, and surface seepage water can be drained, thereby effectively ensuring the stability of the spoil heap; the reasonable arrangement of the construction sequence can meet the spoil heap's storage function as early as possible, saving construction time; at the same time, in the event of aging or damage to the geotextile, the arrangement of the deep drainage system also provides a safety guarantee for the drainage of the entire spoil heap, reducing the risk of overall instability of the spoil body and the occurrence of landslides. Attached Figure Description

[0018] Figure 1 A plan view of the drainage system for a slope-type spoil disposal site provided by this utility model;

[0019] Figure 2 This is a longitudinal section of the deep-section drainage channel and the horse path drainage ditch;

[0020] Figure 3 This is a longitudinal section of the drainage tunnel;

[0021] Figure 4 This is a cross-sectional view of a deep drainage channel;

[0022] Figure 5 This is a cross-sectional view of a drainage ditch.

[0023] In the diagram: 1-Intercepting ditch; 2-Walkway drainage ditch; 3-Deep intercepting drainage channel; 4-Drainage blind ditch; 5-Drainage hole; 6-Drainage steel pipe; 7-Sedimentation basin; 8-Flute mouth; 31-First geotextile; 32-Geotextile pipe; 33-Graded crushed stone; 34-Stone chips; 35-Completely weathered soil; 41-Large stone; 42-Pebble; 43-Second geotextile; 44-Gravel layer; 51-Drainage hole opening; 52-Deep drainage hole. Detailed Implementation

[0024] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1-5 As shown, a drainage system for a sloping spoil heap includes a surface drainage system, a shallow drainage system and a deep drainage system. The surface drainage system includes a water interception ditch 1 and several walkways. The water interception ditch 1 is set around the edge of the spoil heap. The walkways are set across the surface of the spoil heap. The walkway drainage ditch 2 is set on the inner side of the walkway to drain surface seepage water. The two ends of the walkway drainage ditch 2 are connected to the water interception ditch 1.

[0026] The shallow drainage system includes several deep intercepting drainage channels 3 and drainage blind ditches 4. The deep intercepting drainage channels 3 are arranged in a crisscross pattern below the ground line of the spoil disposal site and above the lower limit of the fully weathered zone. The deep intercepting drainage channels 3 are connected to the drainage blind ditches 4. A slag retaining dam is built at the bottom slope of the spoil disposal site to enhance the anti-sliding stability of the slag body. A drainage steel pipe 6 is pre-buried downstream of the slag retaining dam. The end of the deep intercepting drainage channel 3 is connected to the drainage steel pipe 6.

[0027] The deep drainage system includes a drainage tunnel 5, which is located below the lower limit of the strong weathering zone and is distributed in a zigzag shape. The inner arch and the upstream side of the drainage tunnel 5 are provided with several deep drainage holes 52 at intervals. The interval between two adjacent deep drainage holes 52 is 6 m. The entrance 51 of the drainage tunnel is provided with a drainage ditch, which is connected to the roadside ditch.

[0028] The deep drainage channel 3 is equipped with a first geotextile 31.

[0029] The deep drainage trench is arranged from bottom to top as follows: geotextile pipe 32, graded crushed stone 33, geotextile pipe 32, stone chips 34, and completely weathered soil 35.

[0030] The geotextile 32 is wrapped with geotextile to filter fine particles on the surface of the slag and prevent the geotextile from becoming clogged.

[0031] The drainage blind ditch 4 was constructed from the original drainage ditch and open channel. The bottom of the drainage blind ditch 4 is composed of large stones 41, pebbles 42, second geotextile 43, and gravel layer 44 from bottom to top.

[0032] A sedimentation tank 7 is installed at the outlet of the drainage steel pipe 6 to settle the fine particles in the seepage water.

[0033] A funnel-shaped outlet 8 is installed downstream of sedimentation basin 7 to connect with the existing open channel or downstream river channel to discharge slag and seep water.

[0034] The diameter of the drainage tunnel 5 is 3-5 m.

[0035] The deep drainage hole 52 is equipped with a PE drainage pipe and is wrapped with geotextile to filter fine particles on the surface of the slag.

[0036] To achieve rapid drainage and meet the requirements of the spoil disposal site, the surface of the spoil disposal site after removing the overburden layer is first constructed with a deep drainage channel 3 and a blind ditch 4. After the construction is completed, the spoil disposal site can be piled up. At the same time, drainage tunnel 5 is excavated and deep drainage hole 52 is constructed. After the spoil is piled up to the design elevation, a horse trail and a horse trail drainage ditch 2 are set up on the slope.

[0037] The deep drainage system is also designed to ensure the safety of the entire slag yard drainage. This is mainly because if the geotextile in the crisscrossing intercepting and drainage channels 3 of the shallow drainage system ages or is damaged during use, it will carry away the fine particles in the slag during the drainage process, which may lead to the overall instability of the slag body and cause it to collapse.

[0038] Specifically, the drainage system for the aforementioned slope-type spoil heap is implemented through the following steps:

[0039] S1: Construct intercepting ditches around the perimeter of the slag dump. The intercepting ditches shall be constructed of reinforced concrete.

[0040] S2: After removing the surface cover layer of the mountain, the original gullies and open channels on the surface are converted into drainage blind ditches. The ditches are laid and compacted in layers from bottom to top in the order of large stones, pebbles and gravel to the design elevation. To ensure the drainage effect of the blind ditches and prevent fine particles from clogging them, a layer of geotextile is placed between the pebble and gravel layers.

[0041] S3: Concrete retaining dam is built at the bottom slope of the spoil disposal site. A drainage steel pipe is pre-embedded in the dam body. A reinforced concrete sedimentation tank is set at the downstream outlet of the drainage steel pipe to settle fine particles in the seepage water of the spoil. A funnel-shaped opening is set at the downstream of the sedimentation tank to connect with the existing open channel or downstream river to discharge the seepage water of the spoil.

[0042] S4: First, remove the completely weathered layer from the deep, crisscrossing interception and drainage trenches on the mountain surface. Then, lay geotextile pipes at the bottom and wrap them with geotextile fabric. Backfill the inside of the interception and drainage trenches with crushed stone and stone chips, and wrap the bottom of the interception and drainage trenches with geotextile fabric. After the excavation platform at the top of the drainage trenches is treated with geotextile pipes wrapped with geotextile fabric and stone chips backfilled, backfill a layer of completely weathered soil on top and pile the waste in the spoil disposal site by layered compaction. The end of the drainage trench is effectively connected to the drainage steel pipe of the slag retaining dam.

[0043] S5: After the spoil heap is piled up to the design elevation, a horse walkway is set up on the surface, and a horse walkway drainage ditch is set up on the inside of the horse walkway to drain some of the natural slope rainwater.

[0044] S6: A zigzag drainage tunnel is excavated below the strong weathering limit at the bottom of the slag heap. To meet the drainage needs of the drainage tunnel, the tunnel is arranged along the slope. To save construction time, the drainage tunnel can be excavated using the TBM method. The diameter of the excavation section should be 3-5 m. Deep drainage holes are constructed inside the drainage tunnel. PE drainage pipes are buried in the deep drainage holes and wrapped with geotextile. A drainage ditch is excavated at the entrance of the drainage tunnel to lead to the existing roadside ditch for discharge.

[0045] The above specific embodiments are used to explain and illustrate the present utility model, and are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made to the present utility model within the spirit and protection scope of the claims shall fall within the protection scope of the present utility model.

Claims

1. A drainage system for a slope-type spoil heap, characterized in that: It includes a surface drainage system, a shallow drainage system and a deep drainage system. The surface drainage system includes a water interception ditch (1) and several horse walkways. The water interception ditch (1) is set around the edge of the slag yard. The horse walkways are set across the surface of the slag pile. The horse walkway drainage ditch (2) is provided on the inner side of the horse walkway. The two ends of the horse walkway drainage ditch (2) are connected to the water interception ditch (1). The shallow drainage system includes several deep intercepting drainage channels (3) and drainage blind ditches (4). The deep intercepting drainage channels (3) are arranged in a crisscross pattern below the ground line of the spoil disposal site and above the lower limit of the fully weathered zone. The deep intercepting drainage channels (3) are connected to the drainage blind ditches (4), and the end of the deep intercepting drainage channels (3) is connected to the drainage steel pipe (6). The deep drainage system includes a drainage tunnel (5), which is located below the lower limit of the strong weathering zone and is distributed in a zigzag shape. The inner arch and the upstream side of the drainage tunnel (5) are provided with several deep drainage holes (52) at intervals. The drainage tunnel opening (51) of the drainage tunnel (5) is provided with a drainage channel, which is connected to the roadside ditch.

2. The drainage system for a slope-type spoil heap according to claim 1, characterized in that: The deep drainage channel (3) is provided with a first geotextile (31).

3. The drainage system for a slope-type spoil heap according to claim 1, characterized in that: The deep drainage trench is arranged from bottom to top as follows: geotextile pipe (32), graded crushed stone (33), geotextile pipe (32), stone chips (34), and completely weathered soil (35).

4. The drainage system for a slope-type spoil heap according to claim 3, characterized in that: The geotextile pipe (32) is wrapped with geotextile.

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

6. The drainage system for a slope-type spoil heap according to claim 1, characterized in that: A sedimentation tank (7) is installed at the outlet of the drainage steel pipe (6).

7. The drainage system for a slope-type spoil heap according to claim 6, characterized in that: The sedimentation basin (7) is provided with a funnel-shaped opening (8) downstream, which is connected to the existing open channel or downstream river channel.

8. The drainage system for a slope-type spoil heap according to claim 1, characterized in that: The diameter of the drainage hole (5) is 3-5 m.

9. The drainage system for a slope-type spoil heap according to claim 1, characterized in that: The deep drainage hole (52) is equipped with a PE drainage pipe.

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