CN111707593A - Coal mine underground reservoir bottom plate permeability detection and stability evaluation method - Google Patents
Coal mine underground reservoir bottom plate permeability detection and stability evaluation method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 80
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 45
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 239000011435 rock Substances 0.000 claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 18
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Abstract
The invention provides a permeability detection and stability evaluation method for a coal mine underground reservoir bottom plate, which comprises the following steps: determining a region with faults and cracks in a bottom plate of the coal mine underground reservoir to be evaluated as a geophysical prospecting key region based on geological information of a working face where the coal mine underground reservoir to be evaluated is located; detecting a geophysical prospecting key area and determining a drilling alternative area; sampling the drilling alternative area by adopting a drilling method, and making a coal rock sample standard test; and testing the permeability and the water permeability of the rock sample, and evaluating the coal mine underground reservoir bottom plate risk to be evaluated according to the test result by adopting a preset evaluation standard. The invention adopts a theoretical research, on-site geophysical prospecting and drilling and laboratory test comprehensive research method to carry out the detection of the coal mine underground reservoir bottom plate and evaluate the stability of the bottom plate, thereby guiding the on-site engineering technical measures and ensuring the safe operation of the underground reservoir.
Description
Technical Field
The invention relates to the technical field of coal mining and hydraulic engineering, in particular to a permeability detection and stability evaluation method for a coal mine underground reservoir bottom plate.
Background
The western part (Jinshanmeng Ninggan) is the main coal production area in China, and the coal yield accounts for about 70 percent of the whole country and is in an increasing trend. But in arid and semiarid ecologically fragile areas in western regions, water resources are short, which only account for 3.9 percent of the total amount of water resources in China, and the evaporation capacity of the earth surface is large and is more than 6 times of the precipitation. The Shendong mining area is located in the core area of the energy golden triangle in the west of China, the coal yield exceeds 2 hundred million tons, and water resource protection and utilization are taken as an important technical subject from the beginning of mine construction. Aiming at a large amount of mine water formed by coal mining, through 20 years of continuous technical development and engineering practice, a coal mine underground reservoir technology is innovatively provided, the problem that land salinization is caused due to large evaporation capacity of ground stored water is solved, the coal mine underground reservoir technology is successfully applied to engineering practice, more than 30 coal mine underground reservoirs are built, as shown in fig. 2, the water storage capacity can reach 3100 ten thousand, more than 95% of production, living and ecological water in a mining area is supplied, and water resource guarantee is provided for development of the mining area.
Coal mine underground reservoirs face a plurality of technical problems as innovative underground engineering structures. Wherein the infiltration of the bottom of the underground reservoir is one of the important technical problems. Different from a ground reservoir, if the coal mine underground reservoir is under different underground depths, if the bottom plate leaks, precious water resources of the underground reservoir are lost, meanwhile, peripheral underground water systems are affected, and potential safety risk hazards of coal seam mining can be formed.
The patent 'method for detecting deep rock stratum cracks of a top floor and a bottom floor of a mine goaf by using ultrasonic waves' proposes that an ultrasonic detector is adopted to detect the rock stratum cracks of the top floor and the bottom floor of the goaf; the patent 'a goaf combined multi-wave seismic exploration method' proposes that a multi-wave seismic exploration method is adopted to detect underground goafs; the patent 'an unknown goaf ponding area detection method based on direct current detection' proposes to adopt a direct current detection method, and analyze the distribution condition of the ponding in the unknown goaf through technical resistivity; the patent "a roof empty roof area detection and roadway repair method based on radar detection technology" proposes that the roadway repair design is carried out by detecting the rock stratum fracture condition by utilizing the radar technology; the patent 'a system and method for monitoring reserved coal pillar gob-side entry retaining floor crack development' proposes to adopt a drilling mode and carry out the research on the mining failure rule of the floor by drilling at the bottom of the gob-side entry retaining. The thesis similar simulation research on the evolution law of the fracture of the bottom rock layer under the mining dynamic load effect adopts a simulation test method to research the evolution law of the fracture of the bottom rock layer under the mining dynamic load effect; the thesis application of the transient electromagnetic technology in the water-rich detection of the goaf of the bottom plate adopts a sequential electromagnetic method to detect the water-rich state and the boundary of the goaf of the old kiln; the thesis "detecting the activity and damage condition of the bottom plate of the goaf by using an ultrasonic and radio wave perspective method" describes that the water inrush at the bottom of the goaf is predicted by using an ultrasonic and radio perspective method; a paper, namely a seismic wave method-based baseplate failure region detection technology and application, describes that a mine reflection seismic wave detection and drilling combined technology is adopted to detect the failure condition of a floor; the article, "incubation mechanism of water inrush channel of coal mine floor of Dongjia river based on microseismic monitoring" describes that the microseismic technology is adopted to analyze the crack development of the floor rock stratum and predict the water inrush condition.
The above patents and papers mainly detect goaf roof and floor cracks, goaf water accumulation areas and the like, and no related technical scheme is available at present for detecting the permeability of the floor of the coal mine underground reservoir taking a goaf as a water storage space, and providing a floor permeability evaluation standard for evaluating the risk of the floor permeability.
Disclosure of Invention
The invention aims to solve the technical problem of providing a coal mine underground reservoir bottom plate permeability detection and stability evaluation method, and aims to solve the problem that no related technical scheme can detect the permeability of the coal mine underground reservoir bottom plate taking a goaf as a water storage space and evaluate the risk of the permeability of the bottom plate.
In order to solve the technical problems, the invention provides the following technical scheme:
a coal mine underground reservoir bottom plate permeability detection and stability evaluation method comprises the following steps:
determining a region with faults and cracks in a bottom plate of the coal mine underground reservoir to be evaluated as a geophysical prospecting key region based on geological information of a working face where the coal mine underground reservoir to be evaluated is located;
detecting the geophysical prospecting key area to determine a drilling alternative area;
sampling the drilling alternative area by adopting a drilling method, and making a coal rock sample standard test;
and testing the permeability and the water permeability of the rock sample based on the prepared coal rock sample standard test, and evaluating the coal mine underground reservoir bottom plate risk to be evaluated according to the test result by adopting a preset evaluation standard.
The method comprises the following steps of determining a region with faults and cracks in a bottom plate of the coal mine underground reservoir to be evaluated based on geological information of a working face where the coal mine underground reservoir to be evaluated is located, and taking the region as a geophysical prospecting key region, wherein the method comprises the following steps:
analyzing geological data of a working face where the coal mine underground reservoir to be evaluated is located, and delineating a water storage area of the underground reservoir;
and determining the region with faults and cracks in the bottom plate of the coal mine underground reservoir to be evaluated based on the water storage region of the identified underground reservoir, and taking the region as a geophysical prospecting key region.
Wherein the detecting the geophysical prospecting focal region and determining the drilling candidate region comprises:
and detecting the geophysical prospecting key area by adopting a transient electromagnetic method and a three-position seismic method, and defining a low-resistance abnormal area or a rock stratum loose area according to a detection result to be used as a drilling alternative area.
And the detection range of the geophysical prospecting key area detected by adopting a transient electromagnetic method and a three-position earthquake method is 30m below the bottom plate of the coal mine underground reservoir to be evaluated.
And sampling the drilling candidate area by adopting a drilling method, wherein the sampling depth is within 10m of the downward bottom plate of the coal mine underground reservoir to be evaluated.
The method comprises the following steps of adopting a preset evaluation standard, evaluating the coal mine underground reservoir bottom plate risk to be evaluated according to a test result, and comprising the following steps of:
when the permeability is less than 10-6When the water permeability is less than 1Lu in cm/s, judging the risk level to be first grade;
when the permeability is in the interval [10 ]-6,10-4) When the water permeability is in the interval [1,10 ], judging the risk level to be two levels; wherein the unit of permeability is cm/s, and the unit of water permeability is Lu;
when the permeability is in the interval [10 ]-4,100) When the water permeability is in the interval [10,100 ], judging the risk level to be three levels; wherein the unit of permeability is cm/s, and the unit of water permeability is Lu;
when the permeability is not less than 100cm/s andand when the water permeability is not less than 100Lu, judging the risk level to be four levels.
The technical scheme of the invention has the following beneficial effects:
the permeability of the bottom plate of the coal mine underground reservoir taking the goaf as a water storage space is detected, and a bottom plate permeability evaluation standard is provided to evaluate the risk of the permeability of the bottom plate; the method adopts theoretical research, field geophysical prospecting and drilling and laboratory test comprehensive research methods to carry out coal mine underground reservoir bottom plate detection, evaluates the stability of the bottom plate, provides guidance for formulating a field engineering technical scheme and ensures safe operation of the underground reservoir.
Drawings
FIG. 1 is a schematic flow chart of a coal mine underground reservoir bottom plate permeability detection and stability evaluation method provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of coal mine underground reservoir distribution;
fig. 3 is a schematic diagram of a drilling arrangement of the coal mine underground reservoir bottom plate permeability detection and stability evaluation method provided by the embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The embodiment provides a permeability detection and stability evaluation method for a coal mine underground reservoir bottom plate, as shown in fig. 1, the permeability detection and stability evaluation method for the coal mine underground reservoir bottom plate comprises the following steps:
s101, determining a region with faults and cracks in a bottom plate of the coal mine underground reservoir to be evaluated as a geophysical prospecting key region based on geological information of a working face where the coal mine underground reservoir to be evaluated is located;
it should be noted that the above steps are processes for analyzing geological data, and specifically include: analyzing geological data of a working face where the coal mine underground reservoir to be evaluated is located, and delineating a water storage area of the underground reservoir; and simultaneously, finding out the area with faults and cracks in the bottom plate of the coal mine underground reservoir to be evaluated, and taking the area as a geophysical prospecting key area.
S102, detecting a geophysical prospecting key area and determining a drilling alternative area;
it should be noted that the above steps are a process of performing comprehensive geophysical prospecting, and specifically include: and detecting the geophysical prospecting key region determined in the S101 by adopting a transient electromagnetic method, a three-position seismic method and the like, and defining a low-resistance abnormal region or a rock stratum loose region according to a detection result to be used as a drilling alternative region. Wherein the detection range is 30m below the bottom plate of the coal mine underground reservoir to be evaluated.
S103, sampling the drilling alternative area by adopting a drilling method, and making a coal rock sample standard test;
it should be noted that, the above steps are a process of drilling and sampling, specifically: sampling by adopting a drilling method according to the drilling candidate area determined in the S102, wherein the sampling depth is within 10m of the downward bottom plate of the coal mine underground reservoir to be evaluated, and according to the first part of the coal and rock physical and mechanical property determination method: sampling basic regulations (GB/T23561.1-2009), a standard test (diameter 50mm and height 100mm) of a coal rock sample is made, and the drilling arrangement and the sampling area of the coal rock sample are shown in figure 3.
And S104, testing the permeability and the water permeability of the rock sample based on the prepared coal rock sample standard test, and evaluating the coal mine underground reservoir bottom plate risk to be evaluated according to the test result by adopting a preset evaluation standard.
It should be noted that the above steps are processes of performing laboratory tests and evaluating the stability of the base plate, and specifically include: according to the geological survey specification GB50287-99 of the water conservancy and hydropower engineering, combining the engineering practice of the coal mine underground reservoir, establishing a coal mine underground reservoir bottom plate risk level judgment standard; wherein the content of the first and second substances,
when the permeability is less than 10-6When the water permeability is less than 1Lu in cm/s, judging the risk grade to be first grade, and indicating that the risk is low; when the permeability is in the interval [10 ]-6,10-4) When the water permeability is in the interval [1,10 ], judging the risk level to be two-level, and indicating that the risk is low; when the permeability is in the interval [10 ]-4,100) When the water permeability is in the interval [10,100 ], judging the risk level to be three levels; high indication of riskWherein the unit of permeability is cm/s, and the unit of water permeability is Lu; when the permeability is not less than 100When the water permeability is not less than 100Lu in cm/s, the risk level is judged to be four, indicating that the risk is high. Specifically as shown in table 1 below:
TABLE 1 evaluation standard for coal mine underground reservoir bottom plate stability
The permeability of the bottom plate of the coal mine underground reservoir taking the goaf as a water storage space is detected, a bottom plate permeability evaluation standard is provided, and the risk of the bottom plate permeability is evaluated; the method adopts theoretical research, field geophysical prospecting and drilling and laboratory test comprehensive research methods to carry out coal mine underground reservoir bottom plate detection, evaluates the stability of the bottom plate, provides guidance for formulating a field engineering technical scheme and ensures safe operation of the underground reservoir.
Further, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
It should be further noted that while the above describes a preferred embodiment of the invention, it will be appreciated by those skilled in the art that, having the benefit of the present disclosure, numerous modifications and adaptations can be made without departing from the principles of the invention as set forth herein and are intended to be within the scope of the invention. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Claims (6)
1. A coal mine underground reservoir bottom plate permeability detection and stability evaluation method is characterized by comprising the following steps:
determining a region with faults and cracks in a bottom plate of the coal mine underground reservoir to be evaluated as a geophysical prospecting key region based on geological information of a working face where the coal mine underground reservoir to be evaluated is located;
detecting the geophysical prospecting key area to determine a drilling alternative area;
sampling the drilling alternative area by adopting a drilling method, and making a coal rock sample standard test;
and testing the permeability and the water permeability of the rock sample based on the prepared coal rock sample standard test, and evaluating the coal mine underground reservoir bottom plate risk to be evaluated according to the test result by adopting a preset evaluation standard.
2. The coal mine underground reservoir bottom plate permeability detection and stability evaluation method according to claim 1, wherein the determining a region where a fault or a crack exists in the coal mine underground reservoir bottom plate to be evaluated as a geophysical prospecting focal region based on geological information of a working surface where the coal mine underground reservoir to be evaluated is located comprises:
analyzing geological data of a working face where the coal mine underground reservoir to be evaluated is located, and delineating a water storage area of the underground reservoir;
and determining the region with faults and cracks in the bottom plate of the coal mine underground reservoir to be evaluated based on the water storage region of the identified underground reservoir, and taking the region as a geophysical prospecting key region.
3. The coal mine underground reservoir floor permeability detection and stability evaluation method according to claim 1, wherein the detecting the geophysical prospecting focal area and determining the drilling candidate area comprises:
and detecting the geophysical prospecting key area by adopting a transient electromagnetic method and a three-position seismic method, and defining a low-resistance abnormal area or a rock stratum loose area according to a detection result to be used as a drilling alternative area.
4. The coal mine underground reservoir floor permeability detection and stability evaluation method according to claim 3, wherein a detection range when the geophysical important region is detected by a transient electromagnetic method and a three-position earthquake method is 30m below a coal mine underground reservoir floor to be evaluated.
5. The coal mine underground reservoir floor permeability detection and stability evaluation method according to claim 1, wherein the drilling method is adopted to sample the drilling candidate area at a sampling depth within 10m below the coal mine underground reservoir floor to be evaluated.
6. The coal mine underground reservoir floor permeability detection and stability evaluation method of claim 1, wherein the evaluating coal mine underground reservoir floor risk to be evaluated according to a test result by adopting a preset evaluation standard comprises:
when the permeability is less than 10-6When the water permeability is less than 1Lu in cm/s, judging the risk level to be first grade;
when the permeability is in the interval [10 ]-6,10-4) When the water permeability is in the interval [1,10 ], judging the risk level to be two levels; wherein the unit of permeability is cm/s, and the unit of water permeability is Lu;
when the permeability is in the interval [10 ]-4,100) When the water permeability is in the interval [10,100 ], judging the risk level to be three levels; wherein the unit of permeability is cm/s, and the unit of water permeability is Lu;
when the permeability is not less than 100And when the cm/s and the water permeability is not less than 100Lu, judging that the risk grade is four grades.
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| CN114152566A (en) * | 2021-11-30 | 2022-03-08 | 国家能源投资集团有限责任公司 | Shallow coal mining overburden damage degree determination method based on underground reservoir |
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