CN115305965A - Underground collecting and draining and water seal treatment method for slag warehouse leaked sewage at bottom of warehouse - Google Patents
Underground collecting and draining and water seal treatment method for slag warehouse leaked sewage at bottom of warehouse Download PDFInfo
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- CN115305965A CN115305965A CN202210768364.9A CN202210768364A CN115305965A CN 115305965 A CN115305965 A CN 115305965A CN 202210768364 A CN202210768364 A CN 202210768364A CN 115305965 A CN115305965 A CN 115305965A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 127
- 239000010865 sewage Substances 0.000 title claims abstract description 123
- 239000002893 slag Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 230000000694 effects Effects 0.000 claims abstract description 11
- 238000010276 construction Methods 0.000 claims description 20
- 238000003860 storage Methods 0.000 claims description 11
- 239000003673 groundwater Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 238000009412 basement excavation Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 abstract description 8
- 238000003912 environmental pollution Methods 0.000 abstract description 7
- 238000005086 pumping Methods 0.000 description 8
- 239000007787 solid Substances 0.000 description 7
- 239000011435 rock Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/006—Sealing of existing landfills, e.g. using mining techniques
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/004—Sealing liners
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
Abstract
The invention discloses a method for treating underground collecting and water sealing at the bottom of a slag reservoir for leaked sewage, which is characterized in that a drainage tunnel is arranged at the downstream of a permeable layer at the bottom of the slag reservoir, the elevation of the drainage tunnel is lower than the natural dry-period underground water level of a slag reservoir area, drainage holes with different inclination angles are arranged upwards along the body of the drainage tunnel, the permeable layer is cut off to form a plurality of rows of drainage hole curtains, so that the sewage is collected in a sewage collecting and draining pipeline in the drainage tunnel, a hydraulic landing funnel for collecting the underground water to the drainage tunnel is formed, the underground water level of a sewage area at the bottom of the slag reservoir is reduced, a stable seepage field for collecting the peripheral underground water from a clean water area to the sewage area at the bottom of the slag reservoir is formed, the water sealing effect of the clean water in an artificial seepage field on the sewage is generated, the sewage is prevented from overflowing, a grouting tunnel and an anti-seepage curtain are arranged, the sewage is prevented from being mixed, and the sewage discharge capacity is reduced. The invention utilizes the underground flow field to form the hydraulic landing funnel, ensures that the sewage does not overflow, and leads the sewage to be discharged out of the field in order for treatment, thereby solving the problem of environmental pollution of the underground water.
Description
Technical Field
The invention relates to a method for underground collecting and draining of leaked sewage at the bottom of a slag warehouse and water seal treatment, belonging to the technical field of environmental engineering and hydrogeology.
Background
Most of refuse landfills, tailing ponds, harmful solid slag ponds and the like adopt an anti-seepage system formed by high-density geomembranes as a barrier for preventing pollutants from overflowing. The geomembrane has the advantages of strong chemical corrosion resistance and good impermeability when used for seepage control of the slag storage, but the geomembrane has the defect of poor puncture resistance, is easy to damage due to construction methods, mechanical operation, environmental influence and the like, and has the defects of cracks, holes, scratches and the like, the seepage control effect of the geomembrane is reduced, and leachate of the slag storage can seep into surrounding soil through a fracture position to pollute the soil and underground water, thereby causing serious consequences. And for the early constructed slag warehouse, the problem of irregular construction of bottom seepage-proofing measures often exists, so that the leakage problem is prominent. Because the seepage-proof membrane seepage area is difficult to accurately position and realize fixed-point repair of the horizontal cover, the slag store seepage treatment cost is very high.
In order to ensure the storage capacity of the slag warehouse, most of the refuse landfill, the tailing slag warehouse and the harmful solid slag warehouse are built in natural valleys, and in the karst areas, the natural valleys are generally developed by karsts and are underground undercurrent drainage channels. After the anti-seepage system at the bottom of the slag warehouse is damaged, harmful wastewater can enter the underground rock-soil body and seep and diffuse along the flow direction of underground water, and the depth is large and the distribution is wide. The existing engineering case is usually treated by adopting a conventional pumping mode, but for karst areas, underground water is karst pipeline water and underground undercurrent water, most of the karst pipeline water and the underground undercurrent water are difficult to be communicated by using sparsely distributed pumping wells, so that the scheme of pumping and draining the underground water by using the pumping wells is difficult to prevent leaked sewage from infiltrating; in the process of underground water transportation, a large amount of rock clear water is supplied in multiple channels, so that the mixed flow sewage is often collected in a large amount, the operation and treatment difficulty and cost are greatly increased, and the environmental risk is prominent; and in some engineering cases, a suitable slag yard is selected and replaced, and slag bodies are completely transferred, so that the engineering cost is additionally increased, and land resources are occupied.
Aiming at the problems that harmful wastewater enters underground rock mass and leaks along a permeable layer at the bottom to cause underground water environmental pollution due to the damage of an original seepage-proofing system in a refuse landfill, a tailing slag warehouse and a harmful solid slag warehouse, a more reasonable method is needed, a hydraulic landing funnel is formed by utilizing an underground flow field, the sewage is ensured not to overflow, the sewage is orderly guided and discharged to the outside of the field for treatment, and the problem of underground water environmental pollution is solved.
Disclosure of Invention
The invention aims to provide a method for underground collecting and draining the leaked sewage in a slag warehouse at the bottom of the warehouse and for water seal treatment. The underground flow field is utilized to form a hydraulic landing funnel, so that the sewage is prevented from overflowing, and is orderly guided and discharged to the outside of the field for treatment, and the problem of underground water environmental pollution is solved.
The technical scheme of the invention is as follows: a method for treating the sewage leaked from dregs storehouse includes such steps as arranging a drainage tunnel in the downstream region of the permeable layer in the direction of underground runoff, and arranging drainage holes with different inclination angles upward along the tunnel to intercept the permeable layer to form multiple drainage holes, collecting the sewage leaked from dregs storehouse to drainage tunnel, flowing or pumping it to sewage treating station, and draining the sewage by drainage tunnel to form a hydraulic funnel.
In the method for underground collecting and draining of the bottom of the slag warehouse and water seal treatment of leaked sewage, for a strong seepage section of clean water to sewage, a grouting tunnel is arranged on the downstream side of a drainage tunnel at the bottom of a slag heap of the slag warehouse, a vertical impervious curtain is arranged in the grouting tunnel, the vertical impervious curtain surrounds the slag warehouse according to U-shaped arrangement, the bottom and two ends of the vertical impervious curtain penetrate through a permeable layer and are connected into a waterproof layer at the bottom, a closed impervious curtain system is formed, and clean water replenishing and water supply quantity is intercepted and controlled.
In the method for treating the leaked sewage in the slag silo, the construction traffic and drainage tunnels are arranged on two sides of the initial dam of the slag silo and connected with the grouting tunnels and the drainage tunnels, wherein the elevation of the bottom plate of the construction traffic and drainage tunnels is gradually reduced outwards from the drainage tunnels to form a downward longitudinal slope.
In the method for treating the leaked sewage in the slag warehouse by underground collecting and draining at the bottom of the warehouse and water sealing, the elevation of the drainage tunnel is lower than the natural dry-period underground water level of the slag warehouse area by a certain height, a plurality of rows of drainage holes are arranged at different angles upwards along the drainage tunnel body, the sewage led out by the drainage holes is collected in a sewage collecting and draining pipeline arranged in the drainage tunnel, and the clear water led out by the drainage holes is drained out through the drainage tunnel.
In the underground collecting and draining and water sealing treatment method for the bottom of the slag store leaked sewage, when the vertical thickness of the permeable layer is greater than 80m, grouting tunnels need to be additionally arranged in the middle of the permeable layer, the upper and lower grouting tunnels are staggered front and back, and the upper and lower vertical impervious curtains are connected by using lap joint curtains.
In the underground collecting and draining and water sealing treatment method for the leaked sewage in the slag warehouse, the distance between the grouting tunnel and the bottom of the slag warehouse should be ensured to be a certain safe distance.
In the method for underground collecting and draining the leaked sewage in the slag store and controlling the water seal, if the anti-seepage curtain system adopts a fully-closed curtain, the top elevation of the anti-seepage curtain system is higher than the flood period underground water level, and the bottom elevation of the anti-seepage curtain system is higher than a relative water-resisting layer; if the suspended curtain is adopted, the top elevation of the suspended curtain is higher than the flood season underground water level, and the bottom depth of the suspended curtain can be 1 time of the maximum water level difference inside and outside the curtain below the drainage tunnel.
In the method for treating the underground collecting and draining of the bottom of the slag reservoir leaked sewage and the water seal treatment, the corresponding anti-erosion grouting material is adopted according to the material composition of the sewage during grouting construction of the anti-seepage curtain system.
In the method for treating the leaked sewage in the slag silo by underground collecting and draining at the bottom of the slag silo and water sealing, the construction of the drainage tunnel and the grouting tunnel adopts a static excavation mode and is provided with ventilation and smoke discharge facilities.
In the method for treating the leaked sewage in the slag storage by underground collecting and draining at the bottom of the slag storage and water sealing, the branch holes can be arranged in the sewage collecting and leaking area discovered by investigation in the process of arranging the drainage tunnel.
The invention has the beneficial effects that: compared with the prior art, the underground collecting and draining and water seal treatment method for the leaked sewage at the bottom of the slag warehouse has the following effects:
(1) A drainage tunnel and a plurality of rows of drain holes are arranged below the underground water level of the natural dry period at the bottom of the seepage slag warehouse to form interception and drainage of seepage sewage, so that the underground water level of a sewage area at the bottom of the slag warehouse can be reduced to be lower than the underground water level of a clean water area outside a vertical seepage-proofing curtain, a clean water head outside the seepage-proofing curtain is higher than a sewage head inside the seepage-proofing curtain, an underground flow field hydraulic landing funnel is formed at the drainage tunnel, the water head pressure of clean water outside is ingeniously utilized to naturally form a water seal effect, and the sewage can be prevented from overflowing.
(2) The method comprises the steps of effectively collecting and discharging sewage at the bottom of a slag warehouse and realizing water seal effect of an underground flow field hydraulic landing funnel, intercepting all the sewage, arranging a grouting tunnel at the bottom of the slag warehouse, constructing a vertical anti-seepage curtain in the grouting tunnel, connecting the vertical anti-seepage curtain into a bottom water-resisting layer to form a closed anti-seepage system, and separating the underground sewage and clean water by arranging the vertical anti-seepage curtain, so that the seepage flow of the clean water to the landing funnel can be greatly reduced, the mixing of the sewage and the clean water is avoided, and the sewage treatment capacity is reduced.
(3) The sewage centralized drainage pipeline is arranged in the drainage tunnel, the sewage drained from the drainage holes is collected and drained to the outside of the field for treatment, and the clean water drained from the drainage holes is only drained to a proper position outside the field, so that the sewage disposal can be realized separately, the sewage treatment capacity is reduced, and the treatment cost is reduced.
(4) Through the export elevation of reasonable selection drainage tunnel, the bottom plate elevation of drainage tunnel reduces to the outside from the centre gradually, forms certain decurrent longitudinal slope, guarantees to gather in the sewage of drainage tunnel can flow to off-site sewage treatment station centralized processing through pipeline or escape canal automatically, avoids adopting water pump drainage sewage as far as possible, can greatly reduced operation period sewage pump drainage expense.
Comprehensively, aiming at the problems that harmful wastewater enters underground rock mass due to the damage of an original seepage-proofing system of a conventional refuse landfill, a tailing slag warehouse and a harmful solid slag warehouse and underground water environmental pollution is caused by the seepage along a permeable layer at the bottom, the problem that the sewage overflows and the engineering cost is high cannot be solved completely by a treatment scheme, the invention provides a method for treating the leaked sewage of the slag warehouse at the bottom of the underground rock mass by underground collecting and draining and water sealing, wherein a drainage tunnel is arranged below the underground water level at the bottom of the slag warehouse, drainage holes with different inclination angles are arranged in the drainage tunnel upwards to form a sewage guiding and draining hole curtain, so that the sewage is collected in the drainage tunnel and flows automatically or is pumped to a surface sewage treatment station for treatment. The sewage is guided and discharged through the drainage tunnel, the underground water at the bottom of the slag storage forms an underground water falling funnel, the underground water level of the sewage area is lower than the underground water level of the peripheral clear water area, a seepage field for converging the underground water from the clear water area to the sewage area is formed, and the water sealing effect of the water head pressure of the peripheral clear water is ingeniously utilized to ensure that the sewage does not overflow. For the strong seepage section of clear water to sewage, an underground grouting tunnel is arranged, and a vertical anti-seepage curtain is arranged, so that the clear water seepage quantity is reduced, the collection drainage quantity of sewage is reduced, and the operation cost is reduced.
Drawings
FIG. 1 is a typical section view of a bottom underground collecting and draining and water seal treatment structure of slag storage leaked sewage;
FIG. 2 is a floor plan of a bottom underground collecting and discharging and water seal treatment structure for the leaked sewage in the slag silo;
fig. 3 is a partially enlarged schematic view of fig. 1.
Reference numerals: 1-slag storage slag piling; 2-a water-resisting layer; 3-a water permeable layer; 4-grouting the tunnel; 5-vertical impervious curtain; 6-lapping a curtain; 7-a drainage tunnel; 8-a drain hole; 9-undercurrent flow direction; 10-a hydraulic landing funnel; 11-initial dam of slag storage; 12-constructing a traffic and drainage tunnel; 13-sewage treatment station, 14-sewage centralized leading and discharging pipeline.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
The embodiment of the invention comprises the following steps: for the slag reservoirs such as refuse landfill, tailing slag reservoirs, harmful solid slag reservoirs and the like built in valley areas or karst depression areas, a water-resisting layer 2 and a water-permeable layer 3 are generally arranged at the bottom of a slag piling body 1 of the slag reservoir, the water-resisting layer 2 plays a water-resisting role, and underground water is infiltrated through the water-permeable layer 3. The bottom of the slag heap body of the slag storehouse is provided with a permeable layer 3, and the surface water on the periphery is supplemented with the underground water, so that the underground water in the valley is higher, and the radial flow of the underground water in the permeable layer 3 is stronger. If the permeable layer 3 is a karst stratum, the earth surface may develop overboard holes, spring water and the like.
When the original seepage-proofing system of the slag warehouse is damaged due to construction quality and a stacking and filling process, or the negative and positive pressure action of a bottom karst system, karst collapse and the like cause local damage and seepage, percolate or sewage in the original slag warehouse can seep into the seepage-proofing layer 3 at the bottom of the slag body 1 of the slag warehouse, is mixed with underground clear water, seeps downwards along the original undercurrent flowing direction 9, and causes the environmental pollution of underground water.
In order to solve the technical problem, the method for treating the leaked sewage of the slag warehouse by underground collecting and draining at the bottom of the warehouse and water sealing is provided, a drainage tunnel 7 is arranged below the underground water level of a permeable layer 3 in the dry season, the distance between the drainage tunnel 7 and the bottom of the slag warehouse is ensured to be enough safe thickness, and the elevation of the drainage tunnel 7 is 5-10 m lower than the underground water level of the slag warehouse in the natural dry season. The drainage tunnel 7 is arranged in the downstream area of the permeable layer 3 underground runoff direction below the slag storage, and branch holes can be arranged in the sewage concentrated seepage area discovered by investigation. The drainage holes 8 with different angles are upwards arranged in the drainage tunnel 7 along the length direction of the drainage tunnel to form a multi-row drainage hole curtain for guiding and draining the underground sewage, the arrangement intervals of the drainage holes 8 are 2-5 m, and the drilling intervals of the drainage holes 8 are determined by the interval of structural surfaces such as underground cracks, faults and the like, so that the sewage is ensured not to pass through the drainage hole curtain and flow to the downstream. Sewage is collected in the drainage tunnel 7 through the drain hole 8, flows to the sewage treatment station 13 outside the field through the drainage tunnel 7 for centralized treatment, and when the elevation of the drainage tunnel 7 is low, pumping facilities can be additionally arranged according to actual conditions. According to the method, the peripheral sewage is drained through the drainage tunnel 7 at the bottom of the slag reservoir to form the stable hydraulic landing funnel 10, the groundwater level of the sewage area at the bottom of the slag reservoir is reduced to be lower than the groundwater level of the clean water area outside the impervious curtain, a stable seepage field in which the peripheral groundwater converges from the clean water area to the sewage area at the bottom of the slag reservoir is formed, the water sealing effect of clean water in the artificial seepage field on the sewage is generated, and the sewage can be prevented from overflowing.
The drainage tunnel 7 is internally provided with a sewage centralized drainage pipeline 14, sewage drained from the drainage holes 8 is collected and drained to an off-site sewage treatment station 13 for treatment, and clear water drained from the drainage holes 8 is only drained to an off-site proper position, so that the sewage can be cleaned separately, the sewage treatment capacity is reduced, and the treatment cost is reduced.
And arranging a grouting tunnel 4 in a region with stronger seepage from the peripheral clear water region to the sewage region at 10-15 m downstream of the drainage tunnel 7 at the bottom of the slag piling body 1 of the slag warehouse, wherein the distance between the grouting tunnel 4 and the bottom of the slag warehouse is not less than 15m in order to avoid the bottom of the slag warehouse from collapsing caused by the construction of the grouting tunnel 4. The vertical impervious curtain 5 is arranged in the grouting tunnel 4, the vertical impervious curtain 5 surrounds the slag warehouse according to the U-shaped arrangement, the bottom and two ends of the vertical impervious curtain 5 penetrate through the permeable layer 3 and are connected into the bottom water-resisting layer 2, a closed impervious curtain system is formed, the seepage flow of clean water to the landing funnel can be greatly reduced, and the pumping and treatment capacity of sewage is reduced.
When the vertical thickness of the permeable layer 3 is larger than 80m, in order to ensure the construction quality and the seepage-proofing effect of the vertical seepage-proofing curtain 5, the grouting tunnel 4 is additionally arranged in the middle of the permeable layer 3, the upper and lower grouting tunnels 4 are staggered from front to back, and the upper and lower vertical seepage-proofing curtains 5 are connected by adopting the lap-joint curtain 6, so that the whole seepage-proofing effect of the seepage-proofing curtain is ensured.
If the impervious curtain is a fully-closed curtain, the top elevation of the impervious curtain is higher than the flood season underground water level, and the bottom elevation of the impervious curtain is higher than the relative waterproof layer; if the curtain is a suspended curtain, the top elevation of the curtain is higher than the underground water level in the flood season, and the bottom depth can be 1 time of the maximum water level difference inside and outside the curtain below the drainage tunnel so as to prolong the seepage diameter and reduce the flow.
In the grouting construction process of the impervious curtain, a corresponding anti-corrosion grouting material is adopted according to the material composition of sewage so as to ensure the seepage-proofing effect and the durability of the impervious curtain.
In order to avoid the damage of the original seepage-proofing system of the slag warehouse caused by the blasting construction of the tunnel, the construction of the drainage tunnel 7 and the grouting tunnel 4 which are positioned at the bottom of the slag warehouse adopts a non-blasting excavation mode, namely, a static excavation mode is adopted for excavation, and the ventilation and the smoke discharge of the tunnel are reasonably considered so as to ensure the construction safety.
For convenience of construction, construction traffic and drainage tunnels 12 are arranged on two sides of an initial dam 11 of a slag warehouse and connected with a grouting tunnel 4 and a drainage tunnel 7, wherein the elevation of a bottom plate of the construction traffic and drainage tunnel 12 is gradually reduced outwards from the drainage tunnel 7 to form a downward longitudinal slope, sewage in the drainage tunnel 7 can be guaranteed to flow to an off-site sewage treatment station 13 for centralized treatment through a pipeline or a drainage ditch, pumping drainage of a water pump is avoided as much as possible, and operating cost is reduced.
The method is suitable for collecting and draining underground sewage below the bottom of the leaked harmful percolate such as a refuse landfill, a tailing slag warehouse, a harmful solid slag warehouse and the like, reduces the underground water level of a sewage area below the warehouse, enables the underground water level of peripheral clear water to be higher than the underground water level of the sewage area, forms a seepage field of the peripheral clear water to the sewage area, and achieves the aim of controlling the sewage by sealing the sewage with water and preventing the sewage from overflowing.
The technical scheme is also suitable for the leakage treatment of refuse dumps such as refuse landfills, tailing slag warehouses and harmful solid slag warehouses in non-karst areas.
For the newly-built slag storehouses which are arranged in karst and valley zones due to limited site, before the new storehouses are built, underground groundwater aquifers, water-resisting layer distribution, underground water levels and underground water flow directions of the storehouses can be found out, the technical scheme system is preset, double insurance of horizontal seepage prevention and water seal seepage prevention is formed for the newly-built slag storehouses, the sewage is ensured not to overflow, and the underground water environmental pollution caused when the local damage seepage is caused by the construction quality and the filling process of an original horizontal seepage prevention system of the slag storehouses or the positive and negative pressure action of a bottom karst system, the karst collapse and the like is avoided.
Claims (10)
1. A method for underground collecting and draining and water sealing treatment of slag store leaked sewage at the bottom of a store is characterized by comprising the following steps: the drainage tunnel (7) is arranged in the downstream area of the permeable layer (3) at the bottom of the slag reservoir in the subsurface runoff direction, the elevation of the drainage tunnel (7) is lower than the natural withered-period groundwater level of the slag reservoir area, drain holes (8) with different inclination angles are arranged upwards along the body of the drainage tunnel (7), the drain holes (8) cut off the permeable layer (3) to form a multi-row drain hole curtain, so that sewage leaked from the slag reservoir is collected in the drainage tunnel (7) through the drain holes (8) and automatically flows or is pumped to an earth surface sewage treatment station (13) for treatment, a hydraulic funnel (10) for collecting groundwater to the drainage tunnel (7) is formed through the drainage tunnel (7), the groundwater level of a sewage area at the bottom of the slag reservoir is reduced to be lower than the groundwater level of the groundwater in a clean water area at the periphery of the slag reservoir, a stable seepage field for collecting the sewage from the clean water area to the sewage area at the bottom of the slag reservoir is formed, and the water sealing effect of artificial flow field on the sewage is generated, thereby ensuring that the sewage does not overflow.
2. The underground collecting and draining and water sealing treatment method for the bottom of the slag warehouse leaked sewage according to claim 1, characterized in that: for a strong seepage section of clean water to sewage, a grouting tunnel (4) is arranged on the downstream side of a drainage tunnel (7) at the bottom of a slag stack (1) of a slag warehouse, a vertical seepage-proof curtain (5) is arranged in the grouting tunnel (4), the vertical seepage-proof curtain (5) surrounds the slag warehouse according to U-shaped arrangement, the bottom and two ends of the vertical seepage-proof curtain (5) penetrate through a permeable layer (3) and are connected into a water-proof layer (2) at the bottom to form a closed seepage-proof curtain system, and the water supply quantity of the clean water is intercepted and controlled.
3. The underground collecting and draining and water sealing treatment method for the bottom of the slag warehouse leaked sewage according to claim 1, which is characterized in that: and two sides of the initial dam (11) of the slag warehouse are provided with construction traffic and drainage tunnels (12) which are connected with the grouting tunnel (4) and the drainage tunnel (7), wherein the elevation of a bottom plate of the construction traffic and drainage tunnel (12) is gradually reduced outwards from the drainage tunnel (7) to form a longitudinal slope downwards.
4. The underground collecting and draining and water sealing treatment method for the bottom of the slag warehouse leaked sewage according to claim 1, characterized in that: the elevation of the drainage tunnel (7) is lower than the natural dry-period underground water level of the slag storage area by a certain height, a plurality of rows of drainage holes (8) are arranged at different angles upwards along the drainage tunnel (7), sewage led out by the drainage holes (8) is collected in a sewage centralized leading and draining pipeline (14) arranged in the drainage tunnel (7), and clear water led out by the drainage holes (8) is discharged through the drainage tunnel (7).
5. The underground collecting and draining and water sealing treatment method for the bottom of the slag warehouse leaked sewage according to claim 2, which is characterized in that: when the vertical thickness of the permeable layer (3) is larger than 80m, the grouting tunnel (4) is additionally arranged in the middle of the permeable layer (3), the upper and lower grouting tunnels (4) are staggered front and back, and the upper and lower vertical impervious curtains (5) are connected by adopting lap joint curtains (6).
6. The underground collecting and draining and water sealing treatment method for the bottom of the slag warehouse leaked sewage according to claim 2, characterized in that: the distance between the grouting tunnel (4) and the bottom of the slag warehouse should ensure a certain safety distance.
7. The underground collecting and draining and water sealing treatment method for the bottom of the slag warehouse leaked sewage according to claim 2, characterized in that: if the seepage-proofing curtain system adopts a fully-closed curtain, the top elevation of the seepage-proofing curtain system is higher than the flood season underground water level, and the bottom elevation of the seepage-proofing curtain system is higher than the relative waterproof layer; if a suspended curtain is adopted, the top elevation of the suspended curtain is higher than the underground water level in the flood season, and the bottom depth of the suspended curtain can be 1 time of the maximum water level difference inside and outside the curtain below a drainage tunnel (7).
8. The underground collecting and draining and water sealing treatment method for the bottom of the slag warehouse leaked sewage according to claim 2, which is characterized in that: when the seepage-proof curtain system is grouted, a corresponding anti-corrosion grouting material is adopted according to the material composition of the sewage.
9. The underground collecting and draining and water sealing treatment method for the bottom of the slag warehouse leaked sewage according to claim 2, characterized in that: construction of the drainage tunnel (7) and the grouting tunnel (4) adopts a static excavation mode, and ventilation and smoke exhaust facilities are arranged.
10. The underground collecting and draining and water sealing treatment method for the bottom of the slag warehouse leaked sewage according to claim 1, which is characterized in that: in the setting process of the drainage tunnel (7), branch holes can be arranged in the sewage concentrated seepage areas discovered by investigation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210768364.9A CN115305965A (en) | 2022-07-01 | 2022-07-01 | Underground collecting and draining and water seal treatment method for slag warehouse leaked sewage at bottom of warehouse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210768364.9A CN115305965A (en) | 2022-07-01 | 2022-07-01 | Underground collecting and draining and water seal treatment method for slag warehouse leaked sewage at bottom of warehouse |
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| Publication Number | Publication Date |
|---|---|
| CN115305965A true CN115305965A (en) | 2022-11-08 |
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| CN202210768364.9A Pending CN115305965A (en) | 2022-07-01 | 2022-07-01 | Underground collecting and draining and water seal treatment method for slag warehouse leaked sewage at bottom of warehouse |
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