CN113123827A - Internal circulation system for dewatering water-containing layer of strip mine - Google Patents
Internal circulation system for dewatering water-containing layer of strip mine Download PDFInfo
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- CN113123827A CN113123827A CN202110256918.2A CN202110256918A CN113123827A CN 113123827 A CN113123827 A CN 113123827A CN 202110256918 A CN202110256918 A CN 202110256918A CN 113123827 A CN113123827 A CN 113123827A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 169
- 238000005086 pumping Methods 0.000 claims abstract description 22
- 238000005065 mining Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000009412 basement excavation Methods 0.000 claims abstract description 4
- 239000004927 clay Substances 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 238000001914 filtration Methods 0.000 claims abstract description 3
- 238000003466 welding Methods 0.000 claims abstract description 3
- 238000001514 detection method Methods 0.000 claims description 6
- 239000003657 drainage water Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims 1
- 230000011664 signaling Effects 0.000 claims 1
- 238000001556 precipitation Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides an internal circulation system for a water-containing layer of a dewatering water of a strip mine, which is characterized in that: including around the excavation site or a plurality of dredging well that main supply source direction arranged, set up submerged motor pump and its lifting pipe in every dredging well and draw water promptly dredging water, characterized by: it also has crack recharging well and recharging system; the crack recharging well is a bedrock crack recharging well constructed at a position which is about 0.25R away from the dewatering well in the direction away from the mining field, the construction process and the drilling structure of the recharging well are the same as those of the dewatering well, the non-recharging stratum at the upper part of the recharging well is sealed by clay, the lower crack aquifer is completely provided with steel round hole-wrapped net water filtering pipes, the well wall pipe is a spiral seam welding steel pipe, and the well mouth is 0.5m higher than the ground surface; the recharge system is characterized in that a main pipeline of a water pumping pipe for pumping water is directly paved into a recharge well wall pipe for 2m, a rubber ring is adopted for sealing between the recharge well wall pipe and the water pumping pipe, drained water is recharged into the recharge well through the main pipeline of the water pumping pipe, and meanwhile, a part of drained water is shunted to be used as production and domestic water.
Description
Technical Field
The invention relates to a method for controlling underground water level of a strip mine by adopting a dewatering well, in particular to an internal circulation system of a dewatering water-containing layer of the strip mine.
Background
The open pit mine usually adopts a drain well to control the underground water level, although the underground water in a water-filled aquifer is quantitatively pumped for a long time, the stability of the water level in a mining boundary can be ensured, meanwhile, the underground water level around the mining boundary is also reduced, and a regional underground water level falling funnel formed by draining a large amount of underground water can generate ground settlement and ground subsidence, so that rivers and lakes cut off and dry and spring wells are exhausted; influence vegetation growth; causing a series of ecological environment problems such as land desertification, water and soil loss and the like. Meanwhile, the discharge of the surplus and sparse dry water causes secondary pollution to the environment of the open-pit mine area, wastes water resources and further seriously restricts the implementation of near zero emission of mine pit water. The contradiction between long drainage water amount time of open pit coal mine and zero drainage of drainage water is to be solved urgently.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an internal circulation system of a drainage water-containing layer of an open-pit mine, which breaks through the limitation that a drainage system and a drainage system are bounded by a descending funnel, adopts the underground water dynamics theory of variable boundary conditions, performs underground water recharge in the range of the drainage descending funnel, establishes an open-pit mine drainage short-path underground water circulation mode, and establishes an open-pit mine drainage-recharge water retention system.
The purpose of the invention is realized as follows: the main research object of recharging in the coal-series underground water descending funnel is to carve the underground water recharged in the descending funnel as the change of hydrogeological boundary conditions for a coal-series fracture aquifer affected by coal mining and water filling. A single groundwater extraction process is combined with groundwater recharge. And (4) supplying the drained coal-series fracture aquifer through a recharging well. And establishing a new supplement and discharge balance system. It includes:
1. dredging well arrangement
Open pit mine drainage wells are mostly arranged around the extraction site or in the direction of the main supply source. And arranging the drainage wells at certain intervals according to hydrogeological conditions and mining engineering requirements. This is the commonly used way of dewatering precipitation in pipe wells. Each dewatering well is provided with a submersible electric pump with certain flow and lift and a water lifting pipe thereof for pumping water, namely dewatering water. The submersible pump is controlled by frequency conversion. And forming a water-containing layer into a falling funnel taking the dewatering and dewatering well as the center through a large amount of dewatering and dewatering. Underground water goafs are formed inside and outside the excavation site.
2. Crack recharge well
And constructing a bedrock fracture recharge well at a position which is about 0.25R (R is an influence radius) away from the drainage precipitation well in the direction away from the mining field. The recharge well and the drainage dewatering well adopt the same construction process and drilling structure. And clay sealing is adopted for the upper non-recharge stratum, the water-bearing stratum of the lower fracture is completely provided with a steel round hole mesh-wrapped water filter pipe, the well wall pipe is a spiral seam welded steel pipe, and the well mouth is 0.5m higher than the ground surface.
3. Recharge system
And directly laying the main pipeline of the pumping pipe for pumping water into the well wall pipe of the recharging well for 2 m. And a rubber ring is used for sealing between the well wall pipe of the recharging well and the water raising pipe. This is done for two reasons, one to provide recharge pressure and the other to ensure that the water supply is not contaminated.
The recharge pressure in the recharge well of the system is mainly water head pressure. The pressure of the recharging water head is controlled by controlling the water level in the recharging well. The water level control system in the recharge well comprises:
3.1 automatic water level observer
When the recharging well is constructed in the strip mine, a DN50 water level detection pipe is arranged on the inner side of the casing pipe. An automatic water level observation signal line is arranged in the detection pipe. The automatic water level observer is placed at a wellhead, and transmits a water level monitoring signal in the recharge well to a wellhead control terminal. And the signal of the automatic water level observer is transmitted to the control terminal through the Ethernet.
3.2 control terminal (plc, programmable controller)
And a control terminal is arranged at the control cabinet of the strip mine. The water level automatic observation device is used for receiving a water level signal sent by the water level automatic observation device and sending a valve control signal. The terminal is mainly used for processing water level signals and controlling the electric valve by setting certain water level signals. When the water level in the recharging well reaches the set low water level, the sensor sends a signal for closing the drain pipe and opening the recharging well pipe valve to the electric control valve, and water in the pumping well pipeline is controlled to flow to the recharging well. When the control terminal receives a signal that the water level in the recharging well is higher than the set high water level, the sensor sends a signal for opening the drain pipe and closing the recharging well pipe to the electric control valve, and the water in the pumping well pipe is controlled to flow to the surface mine water treatment system.
3.3, electric control valve
The electrically controlled valve is a conventional three-way valve. And as a controlled original of the control terminal, executing a signal instruction sent by the control terminal. The flow direction of water is controlled by connecting a tee joint with a water supply pipeline of the pumping well, a water injection pipeline of the recharging well and a water treatment drainage pipeline. When the control terminal receives a high water level signal, the electric control valve is controlled to close the valve at one end of the recharge well pipe and open the valve at one end of the drain pipe. When a low water level signal is received, the electric control valve is controlled to close the valve at one end of the drain pipe and open the valve at one end of the recharge well pipe.
In order to ensure a certain recharge quantity, a part of water flow is shunted in the main pipeline of the lifting pipe to be used as production and living water. Therefore, the water for production and living is ensured, and meanwhile, the surplus underground water is recharged back into the water-bearing layer, so that the purposes of draining water, realizing zero discharge and protecting water resources are achieved.
Compared with the prior art, the invention has the following positive effects: the problem of a large amount of difficult drainage and drainage of the strip mine for a long time is solved, the drainage water discharge amount is reduced, and a technical guarantee is provided for water-retaining coal mining.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic of the present invention.
Detailed Description
The invention comprises the following steps:
dredging well arrangement
The surface mine driers 3 are mostly arranged around the extraction site 1 or in the direction of the main supply source. And arranging drainage and dewatering wells at certain intervals according to hydrogeological conditions and mining engineering requirements. This is the commonly used way of dewatering precipitation in pipe wells. And a submersible electric pump 8 with certain flow and lift and a water lifting pipe 2 thereof are arranged in each well for pumping water, namely draining water. The submersible pump is controlled by frequency conversion. And forming a water-containing layer into a falling funnel taking the dewatering and dewatering well as the center through a large amount of dewatering and dewatering. Underground water goafs are formed inside and outside the excavation site.
Crack recharge well
And constructing the bedrock fracture recharge well 5 at a position which is about 0.25R (R is an influence radius) away from the drainage precipitation well in the direction away from the mining field. The recharge well and the drainage and dewatering well adopt the same construction process and drilling structure, namely clay sealing is adopted for the non-recharge stratum at the upper part, the water-bearing stratum at the lower part is completely provided with a steel round hole mesh-wrapped water filtering pipe 7, the well wall pipe adopts a spiral seam welding steel pipe, and the well mouth is 0.5m higher than the ground surface.
Recharge system
And directly laying the main pipeline 4 of the water pumping pipe 2 into the well wall pipe of the recharging well for 2 m. And a rubber ring is used for sealing between the well wall pipe of the recharging well and the water raising pipe. This is done for two reasons, one to provide recharge pressure and the other to ensure that the water supply is not contaminated. And (4) recharging the drained water into the recharging well through the main pipeline of the water raising pipe, and simultaneously shunting part of the drained water to be used as water for production and living. Therefore, the water for production and living is ensured, and meanwhile, the surplus underground water is recharged back into the water-bearing layer, so that the purposes of draining water, realizing zero discharge and protecting water resources are achieved. And 6 is the water line.
The recharge pressure in the recharge well of the system is mainly water head pressure. The pressure of the recharging water head is controlled by controlling the water level in the recharging well. The water level control system in the recharge well comprises:
1. automatic water level observer
When the recharging well is constructed in the strip mine, a DN50 water level detection pipe is arranged on the inner side of the casing pipe. An automatic water level observation signal line is arranged in the detection pipe. The automatic water level observer is placed at a wellhead, and transmits a water level monitoring signal in the recharge well to a wellhead control terminal. And the signal of the automatic water level observer is transmitted to the control terminal through the Ethernet.
2. Control terminal (plc, programmable controller)
And a control terminal is arranged at the control cabinet of the strip mine. The water level automatic observation device is used for receiving a water level signal sent by the water level automatic observation device and sending a valve control signal. The terminal is mainly used for processing water level signals and controlling the electric valve by setting certain water level signals. When the water level in the recharging well reaches the set low water level, the sensor sends a signal for closing the drain pipe and opening the recharging well pipe valve to the electric control valve, and water in the pumping well pipeline is controlled to flow to the recharging well. When the control terminal receives a signal that the water level in the recharging well is higher than the set high water level, the sensor sends a signal for opening the drain pipe and closing the recharging well pipe to the electric control valve, and the water in the pumping well pipe is controlled to flow to the surface mine water treatment system.
3. Electric control valve
The electrically controlled valve is a conventional three-way valve. And as a controlled original of the control terminal, executing a signal instruction sent by the control terminal. The flow direction of water is controlled by connecting a tee joint with a water supply pipeline of the pumping well, a water injection pipeline of the recharging well and a water treatment drainage pipeline. When the control terminal receives a high water level signal, the electric control valve is controlled to close the valve at one end of the recharge well pipe and open the valve at one end of the drain pipe. When a low water level signal is received, the electric control valve is controlled to close the valve at one end of the drain pipe and open the valve at one end of the recharge well pipe.
In order to ensure a certain recharge quantity, a part of water flow is shunted in the main pipeline of the lifting pipe to be used as production and living water. Therefore, the water for production and living is ensured, and meanwhile, the surplus underground water is recharged back into the water-bearing layer, so that the purposes of draining water, realizing zero discharge and protecting water resources are achieved.
Claims (1)
1. The utility model provides a strip mine drainage water content in situ circulation system, includes a plurality of drainage well that arranges around the excavation site or main supply source direction, sets up submerged motor pump and its lifting pipe in every drainage well and draws water promptly the drainage, characterized by: it also has crack recharging well and recharging system; the crack recharging well is a bedrock crack recharging well constructed at a position which is 0.25R away from the dewatering well in the direction far away from the mining field, the construction process and the drilling structure of the recharging well are the same as those of the dewatering well, the non-recharging stratum at the upper part of the recharging well is sealed by clay, the lower crack aquifer is completely provided with steel round hole-wrapped net water filtering pipes, the well wall pipe is a spiral seam welding steel pipe, and the well mouth is 0.5m higher than the ground surface; the recharging system is characterized in that a main pipeline of a water pumping pipe for pumping water is directly laid into a well wall pipe of a recharging well for 2m, a rubber ring is adopted for sealing between the well wall pipe of the recharging well and the water pumping pipe, drained water is recharged into the recharging well through the main pipeline of the water pumping pipe, and meanwhile, a part of drained water is shunted to be used as production and domestic water;
the recharge pressure in the recharge well of the system is mainly water head pressure, the recharge water head pressure is controlled by controlling the water level in the recharge well, and the water level control system in the recharge well comprises:
automatic water level observer
When a recharging well is constructed in a strip mine, a DN50 water level detection pipe is placed on the inner side of a well wall pipe, an automatic water level observation signal line is arranged in the detection pipe, an automatic water level observation instrument is placed at a well head, a water level monitoring signal in the recharging well is transmitted to a well head control terminal, and a signal of the automatic water level observation instrument is transmitted to the control terminal through Ethernet;
control terminal, plc programmable controller
The control terminal is arranged at the control cabinet of the open pit mine and used for receiving a water level signal sent by the automatic water level observation equipment and sending a valve control signal, the terminal is mainly used for processing the water level signal and controlling the electric valve by setting a certain water level signal, and when the water level in the recharging well reaches a set low water level, the sensor sends a signal for closing the drain pipe and opening the valve of the recharging well pipe to the electric control valve and controls the water in the pumping well pipeline to flow to the recharging well; when the control terminal receives a signal that the water level in the recharging well is higher than a set high water level, the sensor sends a signal for opening the drain pipe and closing the recharging well pipe to the electric control valve, and the water in the pumping well pipe is controlled to flow to the surface mine water treatment system;
electric control valve
The electric control valve is a conventional three-way valve,
as a controlled element of the control terminal, executes a signal instruction sent by the control terminal, controls the flow direction of water by connecting a tee joint with a water supply pipeline of a pumping well, a water injection pipeline of a recharging well and a water treatment drainage pipeline,
when the control terminal receives a high water level signal, the electric control valve is controlled to close the valve at one end of the recharge well pipe and open the valve at one end of the drain pipe, and when a low water level signal is received, the electric control valve is controlled to close the valve at one end of the drain pipe and open the valve at one end of the recharge well pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110256918.2A CN113123827A (en) | 2021-03-10 | 2021-03-10 | Internal circulation system for dewatering water-containing layer of strip mine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110256918.2A CN113123827A (en) | 2021-03-10 | 2021-03-10 | Internal circulation system for dewatering water-containing layer of strip mine |
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| CN113123827A true CN113123827A (en) | 2021-07-16 |
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| CN202110256918.2A Pending CN113123827A (en) | 2021-03-10 | 2021-03-10 | Internal circulation system for dewatering water-containing layer of strip mine |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937724A (en) * | 2012-11-20 | 2013-02-20 | 中国神华能源股份有限公司 | Detection method of stope bottom rock stratum of open coal mine |
| CN103758111A (en) * | 2014-01-26 | 2014-04-30 | 丰电阳光(北京)清洁能源技术有限公司 | Fully-sealed underground raw water continuous pumping and injecting system |
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| CN206495266U (en) * | 2017-02-27 | 2017-09-15 | 周莹 | A kind of automatic backflow device of vegetable greenhouse area underground water |
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| CN207244605U (en) * | 2017-07-27 | 2018-04-17 | 蕉岭县建筑工程有限公司 | Deep basal pit recharge system |
| CN109469081A (en) * | 2018-12-11 | 2019-03-15 | 中冶沈勘秦皇岛工程设计研究总院有限公司 | A kind of automation recharge system |
| CN209686428U (en) * | 2019-01-12 | 2019-11-26 | 青岛高新建筑安装工程有限公司 | A kind of inverted well with can water level control automatic recharge system |
| CN110735468A (en) * | 2019-11-21 | 2020-01-31 | 山东省水利科学研究院 | underground water cross-flow supply recharging system combined with irrigation channels and irrigation wells |
-
2021
- 2021-03-10 CN CN202110256918.2A patent/CN113123827A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937724A (en) * | 2012-11-20 | 2013-02-20 | 中国神华能源股份有限公司 | Detection method of stope bottom rock stratum of open coal mine |
| CN103758111A (en) * | 2014-01-26 | 2014-04-30 | 丰电阳光(北京)清洁能源技术有限公司 | Fully-sealed underground raw water continuous pumping and injecting system |
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| CN206495266U (en) * | 2017-02-27 | 2017-09-15 | 周莹 | A kind of automatic backflow device of vegetable greenhouse area underground water |
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Application publication date: 20210716 |