CN110685740A - Method for preventing water damage of shallow-buried deep-thick coal seam mining burned rock - Google Patents
Method for preventing water damage of shallow-buried deep-thick coal seam mining burned rock Download PDFInfo
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- CN110685740A CN110685740A CN201910920426.1A CN201910920426A CN110685740A CN 110685740 A CN110685740 A CN 110685740A CN 201910920426 A CN201910920426 A CN 201910920426A CN 110685740 A CN110685740 A CN 110685740A
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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
Abstract
A method for preventing and controlling water damage of a shallow-buried deep-thick coal seam mining burned rock comprises the following steps: carrying out geophysical prospecting on the ground above the working face to be mined, and determining the range of the water accumulation area in the overlying burning rock on the working face to be mined through the geophysical prospecting; arranging a plurality of water detecting and releasing drill holes in a roadway of a working face to be mined, verifying a water accumulation area determined by geophysical prospecting, determining whether holes exist around the water accumulation area or not and the development degree of cracks around the holes, and finally determining the spatial structure of a burned rock stratum and the water accumulation condition; and dividing the water accumulation area in the burnt rock into a micro-fracture pore water-containing area and a pore fracture water-containing area according to the space structure of the stratum of the burnt rock and the water accumulation condition. According to the method, more scientific and reasonable waterproof coal pillars can be determined according to the difference of control objects in different areas, the water damage prevention effect of the burnt rocks is effectively guaranteed, and the safe production of the working face is guaranteed.
Description
Technical Field
The invention relates to a method for preventing and controlling water damage of a roof rock stratum in coal mining, in particular to a method for preventing and controlling water damage of a shallow-buried deep-thick coal mining burned rock.
Background
The burnt rock is a special rock body formed by changing properties, structures and the like of surrounding rocks after spontaneous combustion of a near-surface coal bed, and a crushed layer and a fracture dense zone are caused by weightless collapse of a top plate of the coal bed after combustion. The burnt rock has strong development of cracks at the lower part and weak development at the upper part in the vertical direction, and the development degrees of cracks in the transverse direction are different. The structural characteristics of the burnt rock easily cause water accumulation in the burnt rock stratum, thereby causing the water damage of coal mining. For a shallow deep coal seam, the burned rocks are easier to form a larger water accumulation area, and great hidden danger is caused to the safe mining of a coal mine. However, the existing method for preventing and controlling water damage of the burned rock in the mining of shallow and deep coal seams cannot completely ensure the safe production of coal mines, and water damage accidents sometimes occur.
In summary, no method for completely preventing and controlling water damage of the burned rocks and ensuring the safety of the coal mine aiming at the exploitation of the shallow-buried deep and thick coal seam exists at present.
Disclosure of Invention
The invention provides a method for preventing and controlling water damage of a shallow-buried deep-thick coal seam mining burned rock, which is used for solving the technical problems of unsatisfactory safety guarantee or large engineering quantity and the like in the existing prevention and control technology.
The technical scheme adopted by the invention is as follows:
a method for preventing and controlling water damage of a shallow-buried deep-thick coal seam mining burned rock comprises the following steps:
(a) carrying out geophysical prospecting on the ground above the working face to be mined, and determining the range of the water accumulation area in the overlying burning rock on the working face to be mined through the geophysical prospecting;
(b) arranging a plurality of water detecting and releasing drill holes in a roadway of a working face to be mined, verifying a water accumulation area determined by geophysical prospecting, determining whether holes exist around the water accumulation area or not and the development degree of cracks around the holes, and finally determining the spatial structure of a burned rock stratum and the water accumulation condition;
(c) dividing a water accumulation area in the burnt rock into a micro-fracture pore water-containing area and a pore fracture water accumulation area according to the space structure of the burnt rock stratum and the water accumulation condition;
(d) determining a plurality of water inrush points according to the distance between the microcrack pore water-bearing area and the hole crack water accumulation area and the roadway of the working face to be mined, constructing a waterproof gate wall in the roadway outside the water inrush points, and pre-burying a drain pipe in the roadway bottom plate of the working face to be mined to realize the controllable drainage of water burst in the burnt rock water accumulation area;
(e) in the micro-crack pore water-bearing zone, a water-proof and water-proof coal pillar is reserved, and the minimum width LMicro-meterCalculated according to the following formula:
wherein M is the mining height of the mining coal bed, the unit is M, h is the distance between the burned rock stratum and the bottom plate of the working face to be mined, the unit is M, p is the water pressure of a pore water-bearing area, MPa, Kp is the tensile strength of the mining coal bed, and MPa;
(f) in the water-accumulating area of hole crack, a water-proof coal pillar is retained, and its minimum width LHole (C)Determined by the following equation:
wherein M is the mining height of the mining coal bed, the unit is M, h is the distance between the burned rock stratum and the bottom plate of the working face to be mined, the unit is M, gamma is the top plate crack angle, the unit is DEG, p is the water pressure of a crack water accumulation area, MPa, Kp is the tensile strength of the mining coal bed, and MPa;
(g) adjusting the position of the incision, wherein the distance between the incision and the water-bearing zone of the microcrack pore is not less than LMicro-meterAnd the distance from the water accumulation area of the hole crack is not less than LHole (C)。
In the method for preventing and controlling water damage of the burnt rock in the shallow-buried deep-thick coal seam mining, a transient electromagnetic geophysical prospecting method is adopted by geophysical prospecting, and the range of the water accumulation area in the burnt rock on the working face to be mined is determined according to the low-resistance abnormal area obtained by the geophysical prospecting.
In the method for preventing and controlling water damage of the burnt rock in the mining of the shallow-buried deep and thick coal seam, the elevation angle of a water detecting and draining drill hole is 1-3 degrees, the position of a final hole is more than 10m of a geophysical prospecting low resistance abnormal area, and the water detecting and draining drill hole is provided with a water stop sleeve of 10m and controls the drilling of a gate valve.
In the method for preventing and controlling water damage of the burning rocks during mining of the shallow and deep coal seams, the micro-fracture pore water-containing area is an area with small pore fracture space and poor connectivity, the water inflow rate q per drilling unit is less than or equal to 0.1L/(s.m), and the pore fracture water accumulation area is an area with violent pore fracture development, large water accumulation static storage capacity, smooth horizontal supply and water inflow rate q per drilling unit of more than 0.1L/(s.m).
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the method for preventing and controlling the water damage of the burnt rock during the exploitation of the shallow-buried deep and thick coal seam, the spatial structure and the water accumulation condition of the burnt rock stratum are determined by means of geophysical prospecting and drilling comprehensive exploration, the burnt rock water accumulation area is divided into the micro-crack pore water-containing area and the hole crack water accumulation area according to different spatial structures and water accumulation conditions, and the minimum value calculation formula of the width of the waterproof and waterproof coal pillar is determined.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.
The method for preventing and controlling water damage of the burnt rock during mining of the shallow-buried deep and thick coal seam comprises the following steps:
(a) carrying out geophysical prospecting on the ground above the working face to be mined, and determining the range of the water accumulation area in the overlying burning rock on the working face to be mined through the geophysical prospecting;
(b) arranging a plurality of water detecting and releasing drill holes in a roadway of a working face to be mined, verifying a water accumulation area determined by geophysical prospecting, determining whether holes exist around the water accumulation area or not and the development degree of cracks around the holes, and finally determining the spatial structure of a burned rock stratum and the water accumulation condition;
(c) dividing a water accumulation area in the burnt rock into a micro-fracture pore water-containing area and a pore fracture water accumulation area according to the space structure of the burnt rock stratum and the water accumulation condition;
(d) determining a plurality of water inrush points according to the distance between the microcrack pore water-bearing area and the hole crack water accumulation area and the roadway of the working face to be mined, constructing a waterproof gate wall in the roadway outside the water inrush points, and pre-burying a drain pipe in the roadway bottom plate of the working face to be mined to realize the controllable drainage of water burst in the burnt rock water accumulation area;
(e) in the micro-crack pore water-bearing zone, a water-proof and water-proof coal pillar is reserved, and the minimum width LMicro-meterCalculated according to the following formula:
wherein M is the mining height of the mining coal bed, the unit is M, h is the distance between the burned rock stratum and the bottom plate of the working face to be mined, the unit is M, P is the water pressure of a pore water-bearing area, MPa, Kp is the tensile strength of the mining coal bed, and MPa;
(f) in the water-accumulating area of hole crack, a water-proof coal pillar is retained, and its minimum width LHole (C)Determined by the following equation:
wherein M is the mining height of the mining coal bed, the unit is M, h is the distance between the burned rock stratum and the bottom plate of the working face to be mined, the unit is M, gamma is the top plate crack angle, the unit is DEG, p is the water pressure of a crack water accumulation area, MPa, Kp is the tensile strength of the mining coal bed, and MPa;
(g) adjusting the position of the incision, wherein the distance between the incision and the water-bearing zone of the microcrack pore is not less than LMicro-meterAnd the distance from the water accumulation area of the hole crack is not less than LHole (C)。
In the embodiment, a transient electromagnetic geophysical prospecting method adopted by geophysical prospecting determines the range of the water accumulation region in the overlying burned rocks of the working surface to be mined according to the low-resistance abnormal region obtained by geophysical prospecting.
In the embodiment, the elevation angle of the water detecting and releasing drill hole is 2 degrees, the position of the final hole is more than 10m of the geophysical prospecting low resistance abnormal area, and the water detecting and releasing drill hole is provided with a water stop sleeve pipe of 10m and a control gate valve for drilling.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (4)
1. A method for preventing and controlling water damage of a shallow-buried deep-thick coal seam mining burned rock is characterized by comprising the following steps: the method comprises the following steps:
(a) carrying out geophysical prospecting on the ground above the working face to be mined, and determining the range of the water accumulation area in the overlying burning rock on the working face to be mined through the geophysical prospecting;
(b) arranging a plurality of water detecting and releasing drill holes in a roadway of a working face to be mined, verifying a water accumulation area determined by geophysical prospecting, determining whether holes exist around the water accumulation area or not and the development degree of cracks around the holes, and finally determining the spatial structure of a burned rock stratum and the water accumulation condition;
(c) dividing a water accumulation area in the burnt rock into a micro-fracture pore water-containing area and a pore fracture water accumulation area according to the space structure of the burnt rock stratum and the water accumulation condition;
(d) determining a plurality of water inrush points according to the distance between the microcrack pore water-bearing area and the hole crack water accumulation area and the roadway of the working face to be mined, constructing a waterproof gate wall in the roadway outside the water inrush points, and pre-burying a drain pipe in the roadway bottom plate of the working face to be mined to realize the controllable drainage of water burst in the burnt rock water accumulation area;
(e) in the micro-crack pore water-bearing zone, a water-proof and water-proof coal pillar is reserved, and the minimum width LMicro-meterCalculated according to the following formula:
wherein M is the mining height of the mining coal bed, the unit is M, h is the distance between the burned rock stratum and the bottom plate of the working face to be mined, the unit is M, p is the water pressure of a pore water-bearing area, MPa, Kp is the tensile strength of the mining coal bed, and MPa;
(f) in the water-accumulating area of hole crack, a water-proof coal pillar is retained, and its minimum width LHole (C)Determined by the following equation:
wherein M is the mining height of the mining coal bed, the unit is M, h is the distance between the burned rock stratum and the bottom plate of the working face to be mined, the unit is M, Y is the top plate crack angle, the unit is DEG, p is the water pressure of a crack water accumulation area, MPa, Kp is the tensile strength of the mining coal bed, and MPa;
(g) adjusting the position of the incision, wherein the distance between the incision and the water-bearing zone of the microcrack pore is not less than LMicro-meterAnd the distance from the water accumulation area of the hole crack is not less than LHole (C)。
2. The method for preventing and controlling water damage of the burning rocks during mining of the shallow and deep coal seam according to claim 1, characterized by comprising the following steps: and determining the range of the water accumulation area in the overlying burning rock on the working surface to be mined according to the low-resistance abnormal area obtained by geophysical prospecting by using a transient electromagnetic geophysical prospecting method.
3. The method for preventing and controlling water damage of the burning rocks during mining of the shallow and deep coal seam according to claim 2, characterized by comprising the following steps: the elevation angle of the water detecting and draining drill hole is 1-3 degrees, the position of a final hole is more than 10m of the position of the abnormal area of the geophysical prospecting low resistance, and the water detecting and draining drill hole is provided with a water stop sleeve pipe of 10m and a control gate valve for drilling.
4. The method for preventing and controlling water damage of the mining burned rock of the shallow and deep coal seam according to any one of claims 1 to 3, wherein: the microcrack pore water-containing area is an area with small pore crack space and poor connectivity, the per water inflow q of the drill hole is less than or equal to 0.1L/(s.m), and the pore crack water-accumulating area is an area with violent pore crack development, large static water accumulation storage capacity, smooth horizontal supply and the per water inflow q of the drill hole is more than 0.1L/(s.m).
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Citations (6)
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| SU909172A1 (en) * | 1980-06-13 | 1982-02-28 | Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Горной Геомеханики И Маркшейдерского Дела | Method of protecting mine workings from water breakthrough |
| CN103184871A (en) * | 2013-03-15 | 2013-07-03 | 陕西煤业化工技术研究院有限责任公司 | Coal pillar setting and extracting method for protecting important water body |
| CN103742145A (en) * | 2013-12-24 | 2014-04-23 | 山东新阳能源有限公司 | Water control method for abnormal water-enriched region of coal mine |
| CN104819010A (en) * | 2015-03-26 | 2015-08-05 | 山东科技大学 | Construction method used for preventing roof and floor water inrush in the case that mine working surfaces pass through faults with water permeability |
| CN205260004U (en) * | 2015-12-30 | 2016-05-25 | 贵州盘江精煤股份有限公司 | Drainage device drills down |
| CN109209481A (en) * | 2018-10-10 | 2019-01-15 | 中国矿业大学(北京) | Crack grouting charge for remittance method is developed around a kind of goaf |
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2019
- 2019-09-26 CN CN201910920426.1A patent/CN110685740A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU909172A1 (en) * | 1980-06-13 | 1982-02-28 | Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Горной Геомеханики И Маркшейдерского Дела | Method of protecting mine workings from water breakthrough |
| CN103184871A (en) * | 2013-03-15 | 2013-07-03 | 陕西煤业化工技术研究院有限责任公司 | Coal pillar setting and extracting method for protecting important water body |
| CN103742145A (en) * | 2013-12-24 | 2014-04-23 | 山东新阳能源有限公司 | Water control method for abnormal water-enriched region of coal mine |
| CN104819010A (en) * | 2015-03-26 | 2015-08-05 | 山东科技大学 | Construction method used for preventing roof and floor water inrush in the case that mine working surfaces pass through faults with water permeability |
| CN205260004U (en) * | 2015-12-30 | 2016-05-25 | 贵州盘江精煤股份有限公司 | Drainage device drills down |
| CN109209481A (en) * | 2018-10-10 | 2019-01-15 | 中国矿业大学(北京) | Crack grouting charge for remittance method is developed around a kind of goaf |
Non-Patent Citations (1)
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| 宋业杰等: "榆神矿区烧变岩水害防治技术", 《煤矿安全》 * |
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