CN117189240A - Top and bottom plate water damage control method for large-dip-angle coal seam multi-section mining - Google Patents
Top and bottom plate water damage control method for large-dip-angle coal seam multi-section mining Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 174
- 239000003245 coal Substances 0.000 title claims abstract description 84
- 238000005065 mining Methods 0.000 title claims abstract description 65
- 230000006378 damage Effects 0.000 title claims abstract description 64
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- 230000008569 process Effects 0.000 claims abstract description 19
- 238000005553 drilling Methods 0.000 claims description 50
- 239000011435 rock Substances 0.000 claims description 27
- 238000004364 calculation method Methods 0.000 claims description 17
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- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000009412 basement excavation Methods 0.000 claims description 3
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- 239000003657 drainage water Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
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- 238000009825 accumulation Methods 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
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- 238000004939 coking Methods 0.000 description 1
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Abstract
The application discloses a top-bottom water hazard control method for multi-section mining of a large-dip-angle coal seam, which is characterized in that the coal seam is divided into a plurality of sections, each section is provided with a section transportation lane and a section return air lane, and the section transportation lane of each section is communicated with the section return air lane through a working surface; judging whether a water damage accident of the top and the bottom is generated in the exploitation process, and if the water damage accident of the top and the bottom is not generated in the exploitation process, directly and sequentially exploiting each section; if the water damage accident of the top and bottom plates occurs in the exploitation process, pre-digging a second section transportation lane in the second section before the exploitation of the first section, arranging a drill site in the second section transportation lane to conduct water exploration and drainage operation, and then exploiting the first section until the exploitation of all sections is completed. The application ensures that the working face is not influenced by the aquifer basically when being mined, has good prevention effect on the water burst of the mine, and ensures the safe mining of the working face.
Description
Technical Field
The application belongs to the technical field of coal mining, and relates to a roof and floor water damage control method for large-dip-angle coal seam multi-section mining.
Background
Along with gradual exhaustion of coal resources easy to coal in shallow parts, coal mining from shallow parts to deep parts becomes a major difficulty in safe mining of large-dip-angle coal beds.
The large-dip coal seam is a coal seam with a dip angle of 35-55 degrees, occupies a large specific gravity in the coal reserves, and is mostly coking coal and anthracite with better coal quality. In the large-dip-angle coal seam exploitation process, the high-dip-angle coal seam is easily seriously influenced by sandstone fracture bearing water, and mine water burst easily occurs in the mine exploitation process. In addition, the stability of the top and bottom plates of the coal seam is difficult to control due to the influence of the dip angle effect when the large dip angle coal seam is mined, the water pressure change of the dip water layer is remarkable, and the possibility of water burst accidents of the mine is higher. The mine water burst is taken as one of five disasters of the coal mine, seriously threatens the life health of underground workers and the safe exploitation of coal, and prevents the occurrence of mine water damage accidents, which is the important factor of the safe production work of the coal mine.
Therefore, the method has important significance on how to effectively prevent and treat the water damage in the exploitation process of the large-dip-angle coal seam.
Disclosure of Invention
Aiming at the defects existing in the prior art, the application aims to provide a roof-floor water damage prevention and control method for large-dip-angle coal seam multi-section mining, so as to solve the problem of water damage in coal seam mining, avoid being influenced by a roof-floor aquifer in the mining process, avoid mine water bursting accidents and the like in the coal seam mining.
In order to solve the technical problems, the application adopts the following technical scheme:
a roof-floor water damage control method for multi-section mining of a large-dip-angle coal seam comprises the steps of sequentially forming a direct roof, a basic roof and a roof aquifer from bottom to top above the coal seam, and sequentially forming a floor and a floor aquifer from top to bottom below the coal seam; the method comprises the following steps:
dividing a coal seam into a plurality of sections, wherein a first section and a second section are sequentially arranged from top to bottom; a section transportation lane and a section return lane are respectively arranged in each section; the section transportation lane of each section is communicated with the section return lane through a working surface;
step 2, calculating the height of a roof water guide fracture zone and the depth of a bottom plate damage zone generated during exploitation, and judging whether a roof and bottom plate water damage accident occurs during exploitation; if it is determined that the water damage accident of the top and bottom plates does not occur in the exploitation process, directly and sequentially exploiting each section; if it is determined that the water damage accident of the top plate and the bottom plate occurs in the exploitation process, executing the step 3;
step 3, pre-digging a second section transportation lane in the second section before mining the first section, arranging a drilling site in the second section transportation lane for water drainage detection operation, and then mining the first section;
step 4, pre-digging an n+1th section transportation lane in the n+1th section before mining the n section, arranging a drilling site in the n+1th section transportation lane for water exploration and drainage operation, and then mining the n section; wherein N is an integer and N is more than or equal to 2 and less than or equal to N-1;
and 5, repeating the step 4 until all the section mining is completed.
The application also comprises the following technical characteristics:
specifically, in the step 2, the range of the fracture zone of the roof water guide and the fracture zone of the bottom plate, which are generated during exploitation, is calculated, the parameters of the coal bed and the rock stratum are obtained through measurement, and the height of the fracture zone of the roof water guide and the depth of the fracture zone of the bottom plate are obtained through a method combining theoretical calculation and numerical simulation according to the parameters of the coal bed and the rock stratum.
Specifically, the theoretical calculation formula of the height of the roof water guide fracture zone is as follows:
when the lithology of the roof of the ore layer is a hard rock layer, namely, the uniaxial tensile strength is 40-80 MPa:
when the lithology of the roof of the ore layer is a medium hard rock layer, namely, the uniaxial tensile strength is 20 MPa-40 MPa:
when the lithology of the roof of the ore layer is a weak rock layer, namely, the uniaxial tensile strength is 10MPa to 20 MPa:
when the lithology of the roof of the ore deposit is extremely soft and weak rock stratum, namely the uniaxial tensile strength is less than 10 MPa:
in the above formulae: h f The height of the water guiding fracture zone is m; and sigma m is the accumulated thickness of mining of the ore deposit, and m.
Specifically, the theoretical calculation formula of the depth of the damaged area of the bottom plate is as follows:
wherein: c (C) p The damage depth of mining to the bottom plate is m; h is the mining depth, m; alpha is the inclination angle of the coal bed; f is the floor formation firmness coefficient; l is the inclined length of the working surface and m.
Specifically, the numerical simulation calculation specific process of the height of the top plate water guide fracture zone and the depth of the bottom plate damage zone comprises the following steps: establishing a numerical calculation model according to actual geological conditions, selecting a constitutive model, giving material parameters, giving boundary conditions and initial stress, arranging measuring points for state monitoring, carrying out excavation solution on the model, and observing the development height of a roof water guide fracture zone and the destruction depth of a bottom plate;
the numerical simulation has visibility, the calculated height of the water guide fracture zone, the depth of the damaged area of the bottom plate and the theoretical calculation result are mutually verified, the migration state of the top plate and the bottom plate is observed through the numerical simulation, and whether the water guide fracture zone is communicated with the bottom plate or not is determined, so that water control measures are taken in a targeted mode.
Specifically, in the step 2, the method for judging whether the water damage accident of the top and bottom plates occurs in the exploitation process comprises the following steps:
if the calculated height of the roof water guide fracture zone is smaller than the height from the coal bed to the roof aquifer and the depth of the bottom plate damage area is smaller than the depth from the coal bed to the bottom plate aquifer, judging that the roof and the bottom plate water damage accident cannot occur;
and if the calculated height of the roof water guide fracture zone is larger than the height from the coal bed to the roof aquifer or the depth of the bottom plate damage area is larger than the depth from the coal bed to the bottom plate aquifer, judging that the roof and bottom plate water damage accident can occur.
Specifically, the coal seam and rock stratum parameters comprise a coal seam inclination angle, a coal seam mining accumulation thickness, a mining depth, a floor rock stratum firmness coefficient, a working face inclination length, a roof aquifer water pressure, a floor aquifer water pressure, and a bulk modulus, a shear modulus, a tensile strength, a cohesive force, an internal friction angle and a density of coal and rock.
Specifically, in the step 3 and the step 4, the following method is adopted for the water detection and drainage operation:
if the water pressure of the top plate aquifer and the bottom plate aquifer is less than 2MPa, adopting non-directional drilling to drain water;
and if the water pressure of the top plate aquifer and the bottom plate aquifer is more than 2MPa, adopting directional drilling to drain water.
Specifically, the non-directional drilling drainage comprises:
arranging drilling sites at intervals of 30-50 m in a second section transportation lane or an n+1th section transportation lane, and cutting non-directional drilling holes in the drilling sites, wherein the tail ends of the non-directional drilling holes extend to a top plate aquifer or a bottom plate aquifer to perform water exploration and drainage until the water level in the top plate aquifer and the bottom plate aquifer is reduced to the lower part of the second section or the n+1th section;
the adoption of directional drilling drainage water comprises the following steps:
arranging drilling sites at intervals of 30-50 m in the second section transportation lane or the n+1th section transportation lane, cutting directional drilling holes in the drilling sites, and performing water drainage by detecting and draining at the position where the water pressure of the top plate aquifer or the bottom plate aquifer is less than 2MPa at the tail end of the directional drilling holes, wherein the water drainage is gradually decreased from top to bottom until the water level in the top plate aquifer and the bottom plate aquifer is reduced to the lower part of the second section or the n+1th section.
Specifically, the number of the drill holes in the drilling field is multiple, and the multiple drill holes are distributed in a fan shape.
Compared with the prior art, the application has the following technical effects:
the application adopts the water exploration and drainage to advance one working surface, so that disaster sources and disaster paths are effectively controlled, the working surface mining and the water exploration and drainage can be synchronously carried out, the working surface mining is basically not influenced by aquifers, and the coal mining efficiency is greatly improved. The directional drilling water exploring and draining method has the advantages of high precision, long distance, flexible construction and the like, greatly reduces the construction amount, reduces the labor cost, improves the economic benefit, has good prevention effect on the water burst of the mine, and ensures the safe exploitation of the working face.
The application is suitable for various different aquifer geological conditions, can effectively prevent and treat water damage to high-water-pressure aquifers and low-water-pressure aquifers, and has wide application range.
Drawings
FIG. 1 is a multi-zone face and roadway layout;
FIG. 2 is a schematic illustration of the extent of roof and floor damage after mining of a first zone face;
FIG. 3 is a schematic diagram of non-directional drainage;
FIG. 4 is a schematic view of directional drilling drainage;
FIG. 5 is a diagram of a borehole layout; FIG. 5 (a) is a section view of a drill site; FIG. 5 (b) is a top view of a conveyor lane along a coal seam strike zone;
FIG. 6 is a diagram of a numerical simulation model.
The meaning of each reference numeral in the figures is: 1. a roof aquifer; 2. a base roof; 3. directly pushing; 4. a coal seam; 5. a bottom plate; 6. a floor aquifer; 7. a first section return airway; 8. a first section transport lane; 9. a second section return airway; 10. a second section transport lane; 11. a first section; 12. a second section; 13. a water-conducting fracture zone; 14. a floor failure zone; 15. non-directional drilling; 16. directional drilling; 17. water level of the aquifer; 18. drilling sites.
Detailed Description
The following specific embodiments of the present application are provided, and it should be noted that the present application is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of the present application fall within the protection scope of the present application.
Examples:
the embodiment provides a roof-floor water damage prevention method for large-dip-angle coal seam multi-section mining, referring to fig. 1, which is a multi-section working surface and roadway layout diagram of the application, wherein a direct roof 3, a basic roof 2 and a roof aquifer 1 are sequentially arranged above a coal seam 4 from bottom to top; the bottom plate 5 and the bottom plate aquifer 6 are arranged below the coal bed from top to bottom in sequence.
The application comprises the following steps:
dividing the coal seam 4 into a plurality of sections, wherein the sections are a first section 11 and a second section 12 from top to bottom; a section transportation lane and a section return lane are respectively arranged in each section; the section transportation lane of each section is communicated with the section return lane through a working surface;
specifically, the working surface is in a multi-section arrangement mode, two ends of each section are provided with a section transportation lane and a section return air lane, and each section transportation lane is communicated with the section return air lane through the working surface.
Step 2, calculating the range of the roof water guide fracture zone 13 and the floor damage zone 14 generated during exploitation, and judging whether a roof-floor water damage accident occurs during exploitation; if it is determined that the water damage accident of the top and bottom plates does not occur in the exploitation process, directly and sequentially exploiting each section; if it is determined that the water damage accident of the top plate and the bottom plate occurs in the exploitation process, executing the step 3;
and carrying out water damage prediction on the water bearing layer of the top and bottom plates of the coal seam before mining on the working surface. Acquiring parameters of a coal bed and a rock stratum by measuring, wherein the parameters of the coal bed and the rock stratum comprise a coal bed dip angle, a coal bed exploitation accumulated thickness, a exploitation depth, a base plate rock stratum firmness coefficient, a working surface dip length, a roof aquifer water pressure, a base plate aquifer water pressure, a bulk modulus, a shear modulus, a tensile strength, a cohesive force, an internal friction angle, a density and the like of coal and rock, and the roof aquifer water pressure, the base plate aquifer water pressure, the bulk modulus, the shear modulus, the tensile strength, the cohesive force, the internal friction angle, the density and the like of the coal and the rock are parameters required by numerical simulation; and combining theoretical calculation and numerical simulation according to the coal bed and rock stratum parameters to obtain the ranges of the roof water guide fracture zone 13 and the floor breaking zone 14. As shown in fig. 2, a schematic view of the extent of damage to the roof and floor after mining of the first zone face is shown.
Specifically, the formula for calculating the roof water guide fracture zone is as follows:
(1) when the lithology of the roof of the ore layer is a hard rock layer, namely, the uniaxial tensile strength is 40-80 MPa:
(2) when the lithology of the roof of the ore layer is a medium hard rock layer, namely, the uniaxial tensile strength is 20 MPa-40 MPa:
(3) when the lithology of the roof of the ore layer is a weak rock layer, namely, the uniaxial tensile strength is 10MPa to 20 MPa:
(4) when the lithology of the roof of the ore deposit is extremely soft and weak rock stratum, namely the uniaxial tensile strength is less than 10 MPa:
wherein: h f The height of the water guiding fracture zone is m; and sigma m is the accumulated thickness of mining of the ore deposit, and m.
Specifically, the depth formula for calculating the damaged area of the bottom plate is as follows:
wherein: c (C) p The damage depth of mining to the bottom plate is m; h is the mining depth, m; alpha is the inclination angle of the coal bed; f is the floor formation firmness coefficient; l is the inclined length of the working surface and m.
Only the height of the water guide slit zone and the depth of the bottom plate damage area can be determined through theoretical calculation, the specific water guide position cannot be judged, numerical simulation has visibility, the height of the water guide slit zone and the depth of the bottom plate damage area can be calculated, mutual verification with theoretical calculation results can be achieved, the migration state of the top plate and the bottom plate can be observed, whether the water guide slit zone is communicated with the bottom plate or not is determined, and water control measures can be conveniently and pertinently made.
The numerical simulation software used comprises FLAC3D, UDEC, 3DEC and the like, and the simulation calculation process comprises the following steps: establishing a numerical calculation model according to actual geological conditions, selecting a constitutive model, giving material parameters, giving boundary conditions, initially stressing, arranging measuring points to monitor states, carrying out excavation solving on the model, and observing the development height of a roof water guide fracture zone and the destruction depth of a bottom plate; fig. 6 is a model built by numerical simulation.
If the roof water guide slit zone 13 does not pass through the roof aquifer 1 and the floor destruction zone 14 does not pass through the floor aquifer 6, then the roof-floor water damage accident is determined not to occur;
if the roof water guide slit zone 13 passes through the roof aquifer 1 or the floor failure zone 14 passes through the floor aquifer 6, it is determined that a roof-floor water hazard accident will occur.
If the water damage accident of the top plate and the bottom plate does not occur in the exploitation process, directly and orderly exploiting each section; and if the water damage accident of the top and bottom plates occurs in the exploitation process, executing the step 3.
Step 3, pre-digging a second section transportation lane 10 in the second section 12 before mining the first section 11, arranging a drill site 18 in the second section transportation lane 10 for water exploration and drainage operation, and then mining the first section 11; as shown in fig. 3.
According to the geological condition of the coal seam, the water detection and drainage operation is selected from the following schemes:
first condition: when the water pressure of the top water-bearing layer and the bottom water-bearing layer is smaller (less than 2 MPa), adopting non-directional drilling to drain water.
As shown in fig. 3 and 5, the drill sites 18 are arranged every 30 to 50m in the second section transportation lane 10, and one drill site is arranged every 50m in this embodiment. And cutting a non-directional drilling hole 15 in a drilling site, wherein the tail end of the non-directional drilling hole 15 extends to a roof aquifer or a bottom aquifer to perform water exploration and drainage until the water level 17 in the roof aquifer 1 and the bottom aquifer 6 is reduced to the lower part of the second section, and stoping can be performed on the working surface of the first section when the water amount and the water pressure in the roof aquifer and the bottom aquifer are stable. The water detection and drainage is performed in advance of one section, so that the water damage accident caused by the fact that the water pressure of the water-bearing layer rises to the working surface of the first section after the water level is too high is prevented. The number of the drilling holes 15 is plural, and the water drainage effect is best when the drilling holes are distributed in a fan shape. As shown in fig. 5, the number of drill holes may be set to 5.
Second condition: when the water pressure of the top water-bearing layer and the bottom water-bearing layer is large (more than 2 MPa), a directional drilling drainage mode is adopted.
As shown in fig. 4, the drill sites 18 are arranged every 30 to 50m in the second transport lane 10, and one drill site is arranged every 30m in this embodiment. And (3) cutting the directional drilling holes 16 in the drilling site, wherein the tail ends of the directional drilling holes 16 extend upwards to the position with lower water pressure (the position with water pressure less than 2 MPa) of the top plate aquifer or the bottom plate aquifer for water exploration and drainage, after each drainage, the directional drilling holes are retracted for 100m, the drainage water is carried out again, and the directional drilling holes are sequentially and downwards dredged until the water level 14 in the top plate aquifer 1 and the bottom plate aquifer 6 is reduced to the lower part of the second section. And the working face of the first section can be recovered when the water quantity and the water pressure in the water-bearing layer of the top plate and the water-bearing layer of the bottom plate are stable. The water detection and drainage is performed in advance of one section, so that the water damage accident caused by the fact that the water pressure of the water-bearing layer rises to the working surface of the first section after the water level is too high is prevented. The number of directional drilling holes 16 is a plurality, and the water drainage effect is the best when the plurality of drilling holes are distributed in a fan shape.
Step 4, pre-digging an n+1th section transportation lane in the n+1th section before mining the n section, arranging a drilling site in the n+1th section transportation lane for water exploration and drainage operation, and then mining the n section; wherein N is an integer and 2+.n+.N-1;
and before mining the working surface of the second section to the N-1 section, leading one section to perform water detection and discharge operation, and performing water discharge and pressure relief. According to the different inclination angles and pressure of the bearing water of the coal seam, the positions and the arrangement and the number of the drilling holes of the water discharge pressure relief roadway, namely the conveying roadway and the return air roadway, can be adjusted so as to achieve the optimal drainage effect.
And 5, repeating the step 4 until all the section mining is completed.
And after the N-1 zone is mined, directly mining the N zone.
The application adopts the water exploration and drainage to advance one working surface, so that disaster sources and disaster paths are effectively controlled, the working surface mining and the water exploration and drainage can be synchronously carried out, the working surface mining is basically not influenced by aquifers, and the coal mining efficiency is greatly improved. The directional drilling water exploring and draining method has the advantages of high precision, long distance, flexible construction and the like, greatly reduces the construction amount, reduces the labor cost, improves the economic benefit, has good prevention effect on the water burst of the mine, and ensures the safe exploitation of the working face.
The application is suitable for various different aquifer geological conditions, can effectively prevent and treat water damage to both high water pressure aquifers and low water pressure aquifers, and has wide application range.
Claims (10)
1. A roof-floor water damage control method for multi-section mining of a large-dip-angle coal seam comprises the steps of sequentially forming a direct roof, a basic roof and a roof aquifer from bottom to top above the coal seam, and sequentially forming a floor and a floor aquifer from top to bottom below the coal seam; characterized in that the method comprises the following steps:
dividing a coal seam into a plurality of sections, wherein a first section and a second section are sequentially arranged from top to bottom; a section transportation lane and a section return lane are respectively arranged in each section; the section transportation lane of each section is communicated with the section return lane through a working surface;
step 2, calculating the height of a roof water guide fracture zone and the depth of a bottom plate damage zone generated during exploitation, and judging whether a roof and bottom plate water damage accident occurs during exploitation; if it is determined that the water damage accident of the top and bottom plates does not occur in the exploitation process, directly and sequentially exploiting each section; if it is determined that the water damage accident of the top plate and the bottom plate occurs in the exploitation process, executing the step 3;
step 3, pre-digging a second section transportation lane in the second section before mining the first section, arranging a drilling site in the second section transportation lane for water drainage detection operation, and then mining the first section;
step 4, pre-digging an n+1th section transportation lane in the n+1th section before mining the n section, arranging a drilling site in the n+1th section transportation lane for water exploration and drainage operation, and then mining the n section; wherein N is an integer and N is more than or equal to 2 and less than or equal to N-1;
and 5, repeating the step 4 until all the section mining is completed.
2. The method for preventing and controlling water damage on top and bottom plates for multi-section mining of high-dip-angle coal seam as claimed in claim 1, wherein in the step 2, the range of the fracture zone of the top plate water guide and the fracture zone of the bottom plate generated during mining is calculated, the parameters of the coal seam and the rock stratum are obtained through measurement, and the height of the fracture zone of the top plate water guide and the depth of the fracture zone of the bottom plate are obtained through a method combining theoretical calculation and numerical simulation according to the parameters of the coal seam and the rock stratum.
3. A roof and floor water damage control method for multi-section mining of a high dip coal seam as claimed in claim 2 wherein said roof water guiding fracture zone height theoretical calculation formula is:
when the lithology of the roof of the ore layer is a hard rock layer, namely, the uniaxial tensile strength is 40-80 MPa:
when the lithology of the roof of the ore layer is a medium hard rock layer, namely, the uniaxial tensile strength is 20 MPa-40 MPa:
when the lithology of the roof of the ore layer is a weak rock layer, namely, the uniaxial tensile strength is 10MPa to 20 MPa:
when the lithology of the roof of the ore deposit is extremely soft and weak rock stratum, namely the uniaxial tensile strength is less than 10 MPa:
in the above formulae: h f The height of the water guiding fracture zone is m; and sigma m is the accumulated thickness of mining of the ore deposit, and m.
4. A roof and floor water damage control method for multi-section mining of high dip coal seam as claimed in claim 3 wherein said floor failure zone depth theoretical calculation formula is:
wherein: c (C) p The damage depth of mining to the bottom plate is m; h is the mining depth, m; alpha is the inclination angle of the coal bed; f is the floor formation firmness coefficient; l is the inclined length of the working surface and m.
5. A roof and floor water damage control method for multi-section mining of a high dip coal seam as claimed in claim 4, wherein the numerical simulation calculation of the roof water guide fracture zone height and floor failure zone depth comprises the following steps: establishing a numerical calculation model according to actual geological conditions, selecting a constitutive model, giving material parameters, giving boundary conditions and initial stress, arranging measuring points for state monitoring, carrying out excavation solution on the model, and observing the development height of a roof water guide fracture zone and the destruction depth of a bottom plate;
the numerical simulation has visibility, the calculated height of the water guide fracture zone, the depth of the damaged area of the bottom plate and the theoretical calculation result are mutually verified, the migration state of the top plate and the bottom plate is observed through the numerical simulation, and whether the water guide fracture zone is communicated with the bottom plate or not is determined, so that water control measures are taken in a targeted mode.
6. The method for preventing and controlling water damage of a roof and a floor for multi-section mining of a high-dip coal seam according to claim 1, wherein in the step 2, the method for judging whether a water damage accident of the roof and the floor occurs in the mining process is as follows:
if the calculated height of the roof water guide fracture zone is smaller than the height from the coal bed to the roof aquifer and the depth of the bottom plate damage area is smaller than the depth from the coal bed to the bottom plate aquifer, judging that the roof and the bottom plate water damage accident cannot occur;
and if the calculated height of the roof water guide fracture zone is larger than the height from the coal bed to the roof aquifer or the depth of the bottom plate damage area is larger than the depth from the coal bed to the bottom plate aquifer, judging that the roof and bottom plate water damage accident can occur.
7. A roof and floor water damage control method for multi-zone mining of high inclination coal seams as recited in claim 2, wherein said coal and rock formation parameters include coal seam inclination, coal seam mining cumulative thickness, mining depth, floor formation firmness factor, face slant length, roof aquifer water pressure, floor aquifer water pressure, and bulk modulus, shear modulus, tensile strength, cohesion, internal friction angle and density of the coal rock.
8. A roof and floor water damage control method for multi-section mining of a high-dip coal seam as claimed in claim 2, wherein in the steps 3 and 4, the water detection and drainage operation is performed by adopting the following method:
if the water pressure of the top plate aquifer and the bottom plate aquifer is less than 2MPa, adopting non-directional drilling to drain water;
and if the water pressure of the top plate aquifer and the bottom plate aquifer is more than 2MPa, adopting directional drilling to drain water.
9. A roof and floor water damage control method for multi-zone mining of high dip coal seams as claimed in claim 8, wherein employing non-directional borehole drainage comprises:
arranging drilling sites at intervals of 30-50 m in a second section transportation lane or an n+1th section transportation lane, and cutting non-directional drilling holes in the drilling sites, wherein the tail ends of the non-directional drilling holes extend to a top plate aquifer or a bottom plate aquifer to perform water exploration and drainage until the water level in the top plate aquifer and the bottom plate aquifer is reduced to the lower part of the second section or the n+1th section;
the adoption of directional drilling drainage water comprises the following steps:
arranging drilling sites at intervals of 30-50 m in the second section transportation lane or the n+1th section transportation lane, cutting directional drilling holes in the drilling sites, and performing water drainage by detecting and draining at the position where the water pressure of the top plate aquifer or the bottom plate aquifer is less than 2MPa at the tail end of the directional drilling holes, wherein the water drainage is gradually decreased from top to bottom until the water level in the top plate aquifer and the bottom plate aquifer is reduced to the lower part of the second section or the n+1th section.
10. A roof and floor water damage control method for multi-zone mining of high dip coal seam as claimed in claim 9 wherein the number of boreholes in said drill site is a plurality and the plurality of boreholes are in a fan-shaped distribution.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311149017.9A CN117189240A (en) | 2023-09-07 | 2023-09-07 | Top and bottom plate water damage control method for large-dip-angle coal seam multi-section mining |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311149017.9A CN117189240A (en) | 2023-09-07 | 2023-09-07 | Top and bottom plate water damage control method for large-dip-angle coal seam multi-section mining |
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| CN117189240A true CN117189240A (en) | 2023-12-08 |
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