CN112963199A - Mine underground water regulation and storage method and regulation and storage system - Google Patents
Mine underground water regulation and storage method and regulation and storage system Download PDFInfo
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- CN112963199A CN112963199A CN202110150017.5A CN202110150017A CN112963199A CN 112963199 A CN112963199 A CN 112963199A CN 202110150017 A CN202110150017 A CN 202110150017A CN 112963199 A CN112963199 A CN 112963199A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/08—Filling-up hydraulically or pneumatically
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Abstract
The invention relates to a mine underground water regulation and storage method and a regulation and storage system, and belongs to the technical field of ecological environment protection. The invention provides a mine underground water regulation and storage method, which comprises the following steps: s1, carrying out hydrogeological exploration; s2, determining a direct water-filling aquifer of the gushing water of the mine, selecting the direct water-filling aquifer on the coal seam roof as a water pumping layer, pumping the underground water of the water pumping layer out of the ground, and then injecting the underground water pumped out of the ground into the confined aquifer. The invention provides a mine underground water regulation and storage system, which comprises: the device comprises a liquid pumping pump, a liquid pumping well and a liquid injection well which are positioned on the ground, wherein one end of the liquid pumping well extends into a liquid pumping layer, and the other end of the liquid pumping well is connected with a liquid inlet A of the liquid pumping pump; one end of the liquid injection well is connected with a liquid outlet A of the liquid pump, and the other end of the liquid injection well extends into the confined aquifer. The direct water-filling aquifer is underground water which is not polluted by the pit, a purification device is not required to be built, water treatment is carried out, cost is saved, and safety is high.
Description
Technical Field
The invention belongs to the technical field of ecological environment protection, and particularly relates to a mine underground water regulation and storage method and a regulation and storage system.
Background
The mine underground water is accumulated water in a mine confined aquifer. In the mining process of mineral resources, a large amount of underground water of a mine is discharged to the external environment every year, so that the pollution of surface water and shallow underground water is easily caused on one hand; on the other hand, secondary geological disasters such as karst collapse, seawater invasion and the like are easily caused; and the water injection is carried out on the mine confined aquifer through the reinjection process, so that the whole system of the mine underground water can be effectively regulated and stored, the pollution and the secondary geological disasters are prevented, and the method has great significance for protecting the ecological environment.
At present, the traditional reinjection process is that an underground reservoir is built on a layer where a coal seam is located, mine water of the underground reservoir is pumped to the ground for purification treatment, and finally the purified mine water is injected into a mine confined aquifer through a water injection pipe, so that the purpose of regulating and storing the mine underground water is achieved, and the process is simple. However, the above-mentioned reinjection process requires the establishment of a reservoir underground and a sewage treatment station on the ground, which not only increases the construction cost, but also requires additional working steps for site selection and maintenance of the reservoir and the sewage treatment station, thereby reducing the convenience of the reinjection process.
Therefore, a method for regulating and storing underground water in a mine is needed to solve the technical problems.
Disclosure of Invention
The invention aims to solve the technical problems in the background art, and provides a mine underground water regulation and storage method which can solve the technical problems that the existing reinjection process needs to establish a reservoir underground and a sewage treatment station on the ground, the construction cost is high, the site selection and the maintenance are troublesome, and the convenience of the reinjection process is reduced.
The technical scheme for solving the technical problems is as follows:
a mine underground water regulation and storage method comprises the following steps:
s1, hydrogeological survey is carried out to the ore dressing well of wanting, include: filling water in the mine; the water level and water quality of the confined aquifer; coal bed and mine water burst distribution;
s2, determining a direct water-filling aquifer of the gushing water of the mine, selecting the direct water-filling aquifer on the coal seam roof as a water pumping layer, pumping the underground water of the water pumping layer out of the ground, and then injecting the underground water pumped out of the ground into the confined aquifer.
The invention has the beneficial effects that:
(1) according to the invention, water is pumped from the water-filled aquifer of the roof directly, so that the water burst of the mine can be greatly reduced, and the pumping, injection and regulation in advance can be implemented according to the data of the adjacent mining area before the mine is not exploited, so that the approximate zero emission of the water burst of the mine exploitation is achieved, the production safety is effectively ensured, and the underground water resource is protected;
(2) according to the invention, water is pumped from the directly water-filled aquifer of the coal seam roof, the directly water-filled aquifer is underground water which is not polluted by the mine pit, a purification device is not required to be built, water treatment is implemented, and the cost is saved;
(3) the water pumping position is arranged on the top plate of the coal seam, so that the construction convenience of a water pumping system can be improved, and the convenience and the rapidness are realized;
(4) the invention overcomes the condition that the traditional mine water treatment mode is in passive treatment or treatment, realizes treatment from the source by selecting the directly water-filled aquifer on the coal seam roof as the water pumping layer, and provides a new idea for regulating and storing the underground water of the mine.
It will be understood that the mine gushing water refers to groundwater seeping from various types of sources entering the working face during coal mine construction and production. The main sources of mine water burst are a direct water-filled aquifer (an aquifer where a mine pit is located and fractures are communicated due to mining disturbance) and an indirect water-filled aquifer (a roof, a floor aquifer, surface water and the like which are not affected by mining, and the water can be communicated into a mine through a fault structure and the like under special conditions.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the method comprises the step S3 of preparing coal gangue slurry, wherein the coal gangue slurry consists of 1-4 parts by mass of coal gangue powder and 0.5-1 part by mass of water; and determining a mining-induced fracture disturbance space formed after the water pumping layer pumps water in the step S2, and grouting the coal gangue slurry into the mining-induced fracture disturbance space.
The beneficial effect of adopting the further scheme is that:
(1) the coal gangue slurry grouting position is positioned above the coal seam roof, so that the coal seam is not influenced, the production progress of a mine is not influenced, and the coal gangue slurry grouting position is convenient and effective;
(2) the invention realizes resource utilization of the coal gangue, the main component of the coal gangue is clay mineral, the coal gangue can play a role in sealing and blocking water after being crushed and injected, a water-resisting layer caused by mining disturbance can be repaired, the water quantity of upper underground water for supplying a mine pit through a mining-induced fracture disturbance space is greatly reduced, and the coal gangue slurry does not need other auxiliary materials, is green and environment-friendly, and has better economic benefit.
It can be understood that, during mining in a mine, in-situ stress is changed due to roadway and mineral layer mining engineering, three zones (namely, upper three zones in the mine) are generally formed, a direct contact part of a coal layer becomes a caving zone, a water-guiding fracture zone is formed at the upper part of the caving zone along with stress conduction and gravity action, and then a bending zone of a coal layer top plate is formed, rocks in the bending zone are bent and sunk to different degrees, but cavities to a certain degree are formed in soft and hard rocks due to different rock strengths, and the mining fracture disturbance space is referred to as the cavity.
Further, the particle size of the coal gangue powder is 100-140 meshes.
The beneficial effect of adopting the further scheme is that: by limiting the particle size of the coal gangue powder, the component concentration of the coal gangue slurry can be effectively adjusted, and the closed water-blocking effect of the coal gangue slurry is improved.
Further, the pressure of the grouting is 5-10 MPa.
The beneficial effect of adopting the further scheme is that: the coal gangue slurry can be further promoted to be diffused and compacted through the grouting pressure, and the sealing or filling effect is enhanced.
The invention also provides a mine underground water regulation and storage system which can solve the technical problems of large occupied area, complex pipeline and poor water injection effect of the traditional reinjection treatment system.
The technical scheme for solving the technical problems is as follows:
a mine groundwater conditioning system comprising: the device comprises a liquid pumping pump, a liquid pumping well and a liquid injection well, wherein the liquid pumping pump is fixedly arranged on the ground, a first end of the liquid pumping well extends into a water pumping layer, and a second end of the liquid pumping well is connected with a liquid inlet A of the liquid pumping pump; and the first end of the liquid injection well is connected with a liquid outlet A of the liquid pump, and the second end of the liquid injection well extends into the confined aquifer.
The beneficial effect of adopting the further scheme is that: the liquid pumping equipment and the liquid injection equipment are reasonably configured, the occupied area of the equipment is small, the pipeline arrangement is simple and convenient, the safety is high, and the working efficiency is high.
Further, the horizontal branch well is positioned in the confined aquifer and provided with a liquid inlet B positioned at the top, and the horizontal branch well is connected with the second end of the liquid injection well through the liquid inlet B.
The beneficial effect of adopting the further scheme is that: the ground pipeline has been simplified in the implementation of horizontal branch well, and horizontal branch well can expose the water injection layer section, can make the section of crossing water promote by a wide margin, effectively promotes the water injection volume.
Further, the horizontal branch well comprises a vertical well section and a straight horizontal well section, wherein the vertical well section is provided with a liquid inlet B arranged at the top and a liquid outlet B arranged at the bottom; and a liquid outlet B of the vertical well section is connected with the side wall of the horizontal well section, and the vertical well section and the straight horizontal well section form a T-shaped structure.
The beneficial effects of adopting above-mentioned further scheme are that vertical well section and straight type horizontal well section are made simple and convenient to operate, and T style of calligraphy structure has realized "a hole is multi-purpose", and a set of water injection pipeline controls great water injection region.
Further, the horizontal branch well comprises a vertical well section and a herringbone horizontal well section, wherein the vertical well section is provided with a liquid inlet B arranged at the top and a liquid outlet B arranged at the bottom; the top of the herringbone horizontal well section is provided with a liquid inlet C, the herringbone horizontal well section is connected with a liquid outlet B at the bottom of the vertical well section through the liquid inlet C, and the herringbone horizontal well section and the vertical well section form a herringbone structure.
The beneficial effect of adopting the further scheme is that: the herringbone horizontal well section has a deflecting section, has a buffering effect on fluid, and improves the working stability of the horizontal branch well.
The slurry mixing machine further comprises a first storage tank, a second storage tank, a slurry mixing machine, a grouting pump and a slurry conveying pipe, wherein the first storage tank, the second storage tank, the slurry mixing machine and the grouting pump are all located on the ground; the slurry mixer is provided with a first feeding hole, a second feeding hole and a first discharging hole, and the discharging end of the first storage tank is connected with the first feeding hole through a pipeline; the discharge end of the second storage tank is connected with the second feed inlet through a pipeline; the first discharge port is connected with the liquid inlet end of the grouting pump through a pipeline, the liquid outlet end of the grouting pump is connected with the first end of the slurry conveying pipe, and the second end of the slurry conveying pipe extends into the mining-induced fracture disturbance space formed by the water pumping layer after water pumping.
The beneficial effect of adopting the further scheme is that: the first storage tank and the second storage tank can store coal gangue and water respectively, the coal gangue and the water are transmitted into the slurry mixer through the pipeline to complete slurry mixing work, and then grouting work is completed through the slurry transmission pipe.
Furthermore, the second end of the slurry conveying pipe can be detachably provided with a liquid injection gun head.
The beneficial effect of adopting the further scheme is that: can cooperate different geological conditions and drilling diameter condition through annotating the liquid rifle head, improve slip casting efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a mine underground water storage system for storage regulation according to the present invention;
FIG. 2 is a schematic structural diagram of a grouting operation of the mine underground water storage system of the present invention;
FIG. 3 is a schematic view of a vertical well section and a straight horizontal well section forming a T-shaped configuration in accordance with the present invention;
FIG. 4 is a schematic view of a vertical well section and a straight horizontal well section forming a herringbone structure in accordance with the present invention;
FIG. 5 is a schematic view of a comprehensive columnar structure of a well field stratum according to the present invention.
1. A liquid pump;
2. a liquid pumping well;
3. a liquid injection well;
4. a horizontal multilateral well; 41. a vertical well section; 42. a straight horizontal well section; 43. a herringbone horizontal well section;
5. a first material storage tank;
6. a second material storage tank;
7. a slurry mixer;
8. grouting pump;
9. a pulp conveying pipe; 91. and (4) injecting a liquid gun head.
Detailed Description
The principles and features of the present application are described below in conjunction with embodiments, which are included to explain the present application and are not intended to limit the scope of the present application.
In the description of the present specification, it is to be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present specification.
In the description of the present specification, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application.
In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The terms used in the present specification are those general terms currently widely used in the art in consideration of functions related to the present disclosure, but they may be changed according to the intention of a person having ordinary skill in the art, precedent, or new technology in the art. Also, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the specification should not be construed as simple names but based on the meanings of the terms and the overall description of the present disclosure.
The text is used in this application to describe the operational steps performed according to embodiments of the present application. It should be understood that the operational steps in the embodiments of the present application are not necessarily performed in the exact order recited. Rather, the various steps may be processed in reverse order or simultaneously, as desired. Meanwhile, other operations may be added to the processes, or a certain step or several steps of operations may be removed from the processes.
The following discloses many different embodiments or examples for implementing the subject technology described. While specific examples of one or more arrangements of features are described below to simplify the disclosure, the examples should not be construed as limiting the present disclosure, and a first feature described later in the specification in conjunction with a second feature can include embodiments that are directly related, can also include embodiments that form additional features, and further can include embodiments in which one or more additional intervening features are used to indirectly connect or combine the first and second features to each other so that the first and second features may not be directly related.
The technical solution of the present invention will be described in more detail with reference to the embodiments, wherein the coal gangue is a waste material automatically generated in the mining process.
Example 1
The embodiment provides a mine underground water regulation and storage method, which comprises the following steps:
s1, hydrogeological survey is carried out to the ore dressing well of wanting, include: filling water in the mine; the water level and water quality of the confined aquifer; coal bed and mine water burst distribution;
s2, determining a direct water-filling aquifer of the gushing water of the mine, selecting the direct water-filling aquifer on the coal seam roof as a water pumping layer, pumping the underground water of the water pumping layer out of the ground, and then injecting the underground water pumped out of the ground into the confined aquifer.
The embodiment can solve the technical problems that the prior reinjection process needs to establish a reservoir underground and a sewage treatment station on the ground, has high construction cost and troublesome site selection and maintenance, and reduces the convenience of the reinjection process.
The regulation and storage method of the embodiment can greatly reduce mine water inflow by pumping water from the water-filled aquifer of the roof, and can carry out pumping and regulation and storage in advance according to the data of the adjacent mining area before the mine is not mined, so that the mine mining water inflow is approximately zero emission, the production safety is effectively guaranteed, and underground water resources are protected; water is pumped from a direct water-filled aquifer of the coal seam roof, the direct water-filled aquifer is underground water which is not polluted by the mine pit, a purification device is not required to be built, water treatment is carried out, and cost is saved; the position of drawing water is on the roof of coal seam, can improve pumping system's construction convenience, convenient and fast.
In the present embodiment, the above-mentioned regulation method is performed by a regulation system as shown in fig. 1, and includes: the device comprises a liquid extracting pump 1, a liquid extracting well 2 and a liquid injection well 3, wherein the liquid extracting pump 1 is fixedly arranged on the ground, a first end of the liquid extracting well 2 extends into a water extracting layer, and a second end of the liquid extracting well 2 is connected with a liquid inlet A of the liquid extracting pump 1; the first end of the liquid injection well 3 is connected with a liquid outlet A of the liquid pump 1, and the second end of the liquid injection well 3 extends into a confined aquifer.
The regulation system of this embodiment can solve traditional reinjection processing system area great, and the pipeline is complicated, the not good technical problem of water injection effect.
The liquid pumping equipment and the liquid injection equipment of the embodiment are reasonable in configuration, small in occupied area, simple and convenient in pipeline arrangement, high in safety and good in working efficiency.
Example 2
The embodiment provides a mine underground water regulation and storage method, which comprises the following steps:
s1, hydrogeological survey is carried out to the ore dressing well of wanting, include: filling water in the mine; the water level and water quality of the confined aquifer; coal bed and mine water burst distribution;
s2, determining a direct water-filling aquifer of the gushing water of the mine, selecting the direct water-filling aquifer on a coal seam roof as a water pumping layer, pumping the underground water of the water pumping layer out of the ground, and then injecting the underground water pumped out of the ground into a confined aquifer;
s3, preparing coal gangue slurry, wherein the coal gangue slurry consists of 1 part by mass of coal gangue powder and 0.5 part by mass of water; determining a mining-induced fracture disturbance space formed by pumping water from the water pumping layer in the step S2, and grouting the coal gangue slurry into the mining-induced fracture disturbance space, wherein the grouting pressure is 5MPa, and the particle size of the coal gangue powder is 100 meshes.
The grouting position of the coal gangue slurry is positioned above the coal seam roof, so that the coal seam is not influenced, the production progress of a mine is not influenced, and the coal gangue slurry grouting device is convenient and effective; the resource utilization of the coal gangue is realized, the main component of the coal gangue is clay minerals, the sealing and water-blocking effect can be achieved after the coal gangue is crushed and injected, the water-resisting layer due to mining disturbance can be repaired, the water quantity of the upper underground water in the mine pit supplied through the mining disturbance fracture space is greatly reduced, and the coal gangue slurry does not need other auxiliary materials, is green and environment-friendly, and has good economic benefit.
And secondly, the component concentration of the coal gangue slurry can be effectively adjusted by limiting the particle size of the coal gangue powder, and the closed water-blocking effect of the coal gangue slurry is improved.
Secondly, the coal gangue slurry can be further promoted to be diffused and compacted through the grouting pressure, and the sealing or filling effect is enhanced.
Example 3
The embodiment provides a mine underground water regulation and storage method, which comprises the following steps:
s1, hydrogeological survey is carried out to the ore dressing well of wanting, include: filling water in the mine; the water level and water quality of the confined aquifer; coal bed and mine water burst distribution;
s2, determining a direct water-filling aquifer of the gushing water of the mine, selecting the direct water-filling aquifer on a coal seam roof as a water pumping layer, pumping the underground water of the water pumping layer out of the ground, and then injecting the underground water pumped out of the ground into a confined aquifer;
s3, preparing coal gangue slurry, wherein the coal gangue slurry consists of 4 parts by mass of coal gangue powder and 1 part by mass of water; determining a mining-induced fracture disturbance space formed by pumping water from the water pumping layer in the step S2, and grouting the coal gangue slurry into the mining-induced fracture disturbance space, wherein the grouting pressure is 10MPa, and the particle size of the coal gangue powder is 140 meshes.
Example 4
The embodiment provides a mine underground water regulation and storage method, which comprises the following steps:
s1, hydrogeological survey is carried out to the ore dressing well of wanting, include: filling water in the mine; the water level and water quality of the confined aquifer; coal bed and mine water burst distribution;
s2, determining a direct water-filling aquifer of the gushing water of the mine, selecting the direct water-filling aquifer on a coal seam roof as a water pumping layer, pumping the underground water of the water pumping layer out of the ground, and then injecting the underground water pumped out of the ground into a confined aquifer;
s3, preparing coal gangue slurry, wherein the coal gangue slurry consists of 2 parts by mass of coal gangue powder and 0.8 part by mass of water; determining a mining-induced fracture disturbance space formed by pumping water from the water pumping layer in the step S2, and grouting the coal gangue slurry into the mining-induced fracture disturbance space, wherein the grouting pressure is 8MPa, and the particle size of the coal gangue powder is 120 meshes.
In embodiments 2 to 4, the above-described regulation method is performed by a regulation system as shown in fig. 1 to 3, including: the device comprises a liquid extracting pump 1, a liquid extracting well 2 and a liquid injection well 3, wherein the liquid extracting pump 1 is fixedly arranged on the ground, a first end of the liquid extracting well 2 extends into a water extracting layer, and a second end of the liquid extracting well 2 is connected with a liquid inlet A of the liquid extracting pump 1; the first end of the liquid injection well 3 is connected with a liquid outlet A of the liquid pump 1, and the second end of the liquid injection well 3 extends into a confined aquifer;
the slurry mixing machine further comprises a first storage tank 5, a second storage tank 6, a slurry mixing machine 7, a grouting pump 8 and a slurry conveying pipe 9, wherein the first storage tank 5, the second storage tank 6, the slurry mixing machine 7 and the grouting pump 8 are all located on the ground; the slurry mixer 7 is provided with a first feeding hole, a second feeding hole and a first discharging hole, and the discharging end of the first storage tank 5 is connected with the first feeding hole through a pipeline; the discharge end of the second material storage tank 6 is connected with the second feed inlet through a pipeline; the first discharge port is connected with the liquid inlet end of the grouting pump 8 through a pipeline, the liquid outlet end of the grouting pump 8 is connected with the first end of the slurry conveying pipe 9, and the second end of the slurry conveying pipe 9 extends into a mining-induced fracture disturbance space formed by a water pumping layer after water pumping.
Like this, first storage tank 5, second storage tank 6 can store coal gangue and water respectively, accomplish the work of mixing thick liquid in its later transmission to thick liquid mixer 7 through the pipeline, and the slip casting work is accomplished through defeated thick liquid pipe 9 afterwards to the rethread, and slip casting equipment configuration is reasonable, and the slip casting thick liquid ratio is even, and pressure stability is controllable.
Further, the second end of the slurry conveying pipe 9 can be detachably provided with a liquid injection gun head 91.
Like this, can cooperate different geology condition and the drilling diameter condition through annotating liquid rifle head 91, improve slip casting efficiency.
Further, the device also comprises a horizontal branch well 4 positioned in the confined aquifer, wherein the horizontal branch well 4 is provided with a liquid inlet B positioned at the top, and the horizontal branch well 4 is connected with the second end of the liquid injection well 3 through the liquid inlet B.
Like this, the ground pipeline has been simplified in the implementation of horizontal branch well 4, and horizontal branch well 4 can expose the water injection interval, can make the cross section of crossing promote by a wide margin, effectively promotes water injection volume.
It will be appreciated that the form of the horizontal multilateral well 4 is varied, and two alternative forms are provided below:
firstly, the horizontal branch well 4 comprises a vertical well section 41 and a straight horizontal well section 42, wherein the vertical well section 41 is provided with a liquid inlet B arranged at the top and a liquid outlet B arranged at the bottom; the liquid outlet B of the vertical well section 41 is connected with the side wall of the horizontal well section, and the vertical well section 41 and the straight horizontal well section 42 form a T-shaped structure.
Therefore, the vertical well section 41 and the straight horizontal well section 42 are simple and convenient to manufacture and install, one hole is multipurpose due to the T-shaped structure, and a set of water injection pipeline controls a large water injection area.
Secondly, the horizontal branch well 4 comprises a vertical well section 41 and a herringbone horizontal well section 43, wherein the vertical well section 41 is provided with a liquid inlet B arranged at the top and a liquid outlet B arranged at the bottom; a liquid inlet C is arranged at the top of the herringbone horizontal well section 43, the herringbone horizontal well section 43 is connected with a liquid outlet B at the bottom of the vertical well section 41 through the liquid inlet C, and the herringbone horizontal well section 43 and the vertical well section 41 form a herringbone structure.
Thus, the herringbone horizontal well section 43 has a deflecting section, which has a buffering effect on fluid, and improves the working stability of the horizontal branch well 4.
We provide specific application cases below:
s1, a certain coal mine is selected as an implementation place, 14 pairs of mines exist in the certain coal mine area at present, the water inflow amount of the mines is as high as 140000m3/d, the mineralization degree is high, and the treatment cost of the mine water with high mineralization degree is extremely high. The ground reservoir is gradually filled, no polluted water is discharged, and the mine production is severely restricted. The ecological environment in the area is fragile, and a large amount of coal gangue is stacked to seriously affect the local ecological environment and cause certain damage to surface water and land;
as shown in fig. 4, the mine water filling condition, the confined aquifer water level and water quality condition, the coal bed and the mine water burst distribution are analyzed:
the main mining coal layer in the region is 2 coals, the thickness is 4.07-6.98m, and the general thickness is 5.07 m; the maximum development height of a water flowing fractured zone is calculated to be 53.85m, and 2 coals are about 10m from the Jurassic group, so that the 2-coal direct water-filling aquifer is analyzed to be a sandstone aquifer section at the bottom of the Jurassic group;
the thickness of the aquifer is 17.59-82.50m, the average thickness is 42.94m, the lithology is mainly coarse sandstone, and the lithology is inferior to that of medium sandstone. The aquifer has good water-rich property, the permeability coefficient is 0.028-0.15L/s.m, the permeability coefficient is 0.05-0.13m/d, and the mineralization degree of underground water is 0.34-4 g/L;
the upper indirect water-filled aquifer is a Jurassic stable group and a fourth interstitial diving aquifer, and the majority of the aquifer water-rich area is a weak water-rich aquifer, and the part is weak to medium. The coal seam and the water-bearing stratum between the coal seams are weak in water-rich property. Most of the coal seam floor is silty mudstone and silty sandstone interbedded, the water-rich property is weak, and the water-proof capability is better. According to the petroleum exploration data in the area, the porosity of the coal seam floor Sun's domestic trench group in the area is about 18%, and the leakage phenomenon is mostly generated in the drilling process;
according to hydrological data and analysis of a water flowing fracture zone, the method refers to the research on the influence of coal mining in Ningdong coal fields on regional underground water environment and characteristics thereof in Mayongxiang and analyzes isotopes delta D (thousandths) and delta 18O (thousandths) in the underground water. Comprehensive analysis considers that the water inflow of the mine is mainly composed of a roof direct water-filling aquifer-a direct water-filling aquifer static reserve and mixed supply of upper seepage water;
s2, determining a direct water-filling aquifer of the gushing water of the mine, and selecting the direct water-filling aquifer on the coal seam roof as a water pumping layer; determining a confined aquifer, and selecting a Sunjiai ditch group which is 500m away from a coal seam floor and has relatively developed cracks and gaps as the confined aquifer; pumping the underground water in the water pumping layer out of the ground through a water pumping pump, and then injecting the underground water pumped out of the ground into the confined aquifer through a water injection pump;
s3, grinding the coal gangue powder into coal gangue powder with the particle size of 100 meshes by a ball mill, and then injecting the coal gangue powder into a first storage tank 5; injecting water into the second material storage tank 6; then, adding the coal gangue powder and water into a slurry mixer 7 respectively for mixing;
and determining a mining-induced fracture disturbance space as the top of a mining-induced disturbance fracture layer at the top of the straight line group, and injecting the coal gangue slurry into the mining-induced fracture disturbance space through an injection pump 8, wherein the pressure of the injection is 5 MPa.
The invention overcomes the condition that the traditional mine water treatment mode is in passive treatment or treatment, realizes treatment from the source by selecting the directly water-filled aquifer on the coal seam roof as the water pumping layer, and provides a new idea for regulating and storing the underground water of the mine.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A mine underground water regulation and storage method is characterized by comprising the following steps:
s1, hydrogeological survey is carried out to the ore dressing well of wanting, include: filling water in the mine; the water level and water quality of the confined aquifer; coal bed and mine water burst distribution;
s2, determining a direct water-filling aquifer of the gushing water of the mine, selecting the direct water-filling aquifer on the coal seam roof as a water pumping layer, pumping the underground water of the water pumping layer out of the ground, and then injecting the underground water pumped out of the ground into the confined aquifer.
2. The mine underground water regulation and storage method according to claim 1, further comprising a step S3 of preparing a coal gangue slurry, wherein the coal gangue slurry is composed of 1-4 parts by mass of coal gangue powder and 0.5-1 part by mass of water; and determining a mining-induced fracture disturbance space formed after the water pumping layer pumps water in the step S2, and grouting the coal gangue slurry into the mining-induced fracture disturbance space.
3. The mine underground water regulation and storage method of claim 2, wherein the particle size of the gangue powder is 100-140 mesh.
4. The mine underground water regulation and storage method of claim 2, wherein the pressure of the grouting is 5-10 MPa.
5. A mine groundwater conditioning system, comprising: the device comprises a liquid extracting pump (1), a liquid extracting well (2) and a liquid injection well (3), wherein the liquid extracting pump (1) is fixedly installed on the ground, a first end of the liquid extracting well (2) extends into a water extracting layer, and a second end of the liquid extracting well (2) is connected with a liquid inlet A of the liquid extracting pump (1); the first end of the liquid injection well (3) is connected with a liquid outlet A of the liquid pump (1), and the second end of the liquid injection well (3) extends into the confined aquifer.
6. A mine underground water regulation system according to claim 5, characterized by further comprising a horizontal branch well (4) at the confined aquifer, the horizontal branch well (4) having an inlet B at the top, the horizontal branch well (4) being connected to the second end of the injection well (3) through the inlet B.
7. The mine underground water storage system according to claim 6, wherein the horizontal branch well (4) comprises a vertical well section (41) and a straight horizontal well section (42), the vertical well section (41) is provided with a liquid inlet B arranged at the top and a liquid outlet B arranged at the bottom; the liquid outlet B of the vertical well section (41) is connected with the side wall of the horizontal well section, and the vertical well section (41) and the straight horizontal well section (42) form a T-shaped structure.
8. The mine underground water storage system according to claim 6, wherein the horizontal multilateral well (4) comprises a vertical well section (41) and a herringbone horizontal well section (43), the vertical well section (41) having a liquid inlet B at the top and a liquid outlet B at the bottom; the top of the herringbone horizontal well section (43) is provided with a liquid inlet C, the herringbone horizontal well section (43) is connected with a liquid outlet B at the bottom of the vertical well section (41) through the liquid inlet C, and the herringbone horizontal well section (43) and the vertical well section (41) form a herringbone structure.
9. The mine underground water regulation system according to any one of claims 5 to 8, further comprising a first storage tank (5), a second storage tank (6), a slurry mixer (7), a grouting pump (8) and a slurry delivery pipe (9), wherein the first storage tank (5), the second storage tank (6), the slurry mixer (7) and the grouting pump (8) are all located on the ground; the slurry mixer (7) is provided with a first feeding hole, a second feeding hole and a first discharging hole, and the discharging end of the first storage tank (5) is connected with the first feeding hole through a pipeline; the discharge end of the second material storage tank (6) is connected with the second feed inlet through a pipeline; the first discharge port is connected with the liquid inlet end of the grouting pump (8) through a pipeline, the liquid outlet end of the grouting pump (8) is connected with the first end of the grout conveying pipe (9), and the second end of the grout conveying pipe (9) extends into the mining crack disturbance space formed by the water pumping layer after water pumping.
10. Mine underground water regulation system according to claim 9, characterized in that the second end of the slurry pipe (9) is also removably fitted with a filling gun head (91).
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Application publication date: 20210615 |