CN114737971B - Method for preventing and controlling mine earthquake and rock burst by overlying strata isolation, grouting and filling - Google Patents
Method for preventing and controlling mine earthquake and rock burst by overlying strata isolation, grouting and filling Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002955 isolation Methods 0.000 title claims abstract description 11
- 239000003245 coal Substances 0.000 claims abstract description 53
- 238000005065 mining Methods 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 14
- 239000002910 solid waste Substances 0.000 claims description 11
- 238000005056 compaction Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 4
- 239000011707 mineral Substances 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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Abstract
The invention relates to a method for preventing and controlling mine earthquake and rock burst by overlying rock isolation grouting filling, which is used for preventing and controlling mine earthquake and rock burst by overlying rock grouting filling which is traditionally used for ground surface subsidence reduction and improves the process; selecting the grouting filling layer on a thick hard rock stratum which is closest to a coal bed and causes the mineral shock, wherein the control standard is to ensure that the deflection of the thick hard rock stratum is less than the maximum critical deflection and the thick hard rock stratum is not broken; the treatment is more targeted, and the filling amount of grouting can be reduced, so that the filling cost is reduced, and the recovery efficiency is improved. The first mining working face can be filled without grouting, so that a mining area can be put into production as soon as possible; meanwhile, according to the deflection change rule of the thick and hard rock stratum closest to the coal bed, the working face inclination face width is reasonably designed, and the production efficiency is improved.
Description
Technical Field
The invention belongs to the field of mine earthquake and rock burst of coal mines, and particularly relates to a method for preventing and controlling mine earthquake and rock burst by overlying strata isolation grouting and filling.
Background
After coal mining, a large area of empty area can be formed in a mining area, so that the overlying strata can be deflected, when the deflection reaches a certain degree, the strata can be broken, when the overlying strata has strata with large thickness and hardness, the stress concentration degree is large, the breaking distance is large, accumulated energy can be suddenly released during breaking, so that mine earthquake can be generated, and rock burst can be induced sometimes.
In the prior art, the hydraulic fracturing method is mostly adopted for treating the problem, thick and hard rock layers in overlying strata are pre-fractured, and then the working face is recovered, but when the thickness of the thick and hard rock layers is very large or the number of the thick and hard rock layers is large, the engineering quantity of hydraulic fracturing is very large; the problems of overhigh cost and low recovery efficiency can be caused by adopting the underground filling mining technology. Therefore, the invention provides a method for preventing and controlling the mine earthquake and the rock burst by adopting the overlying rock isolation grouting filling method, the overlying rock isolation grouting filling is mainly used for controlling the surface subsidence, and the purpose of preventing and controlling the mine earthquake and the rock burst is different from that of preventing and controlling the mine earthquake and the rock burst, so that the problem of the invention is the discussion and research on how to adaptively adjust the process of the overlying rock grouting filling based on the purpose of preventing and controlling the mine earthquake and the rock burst.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for preventing and controlling mine earthquake and rock burst by overlying strata isolation grouting filling, which comprises the following steps:
a. determining the position of a thick hard rock layer in the overlying strata, which causes the generation of the mine earthquake, and calculating the breaking distance k of the thick hard rock layer closest to the coal seam 0 And a maximum critical deflection w at rupture 0 ；
b. Arranging a first mining working face in a mining area, carrying out stoping, not carrying out overlying strata grouting filling, and enabling the inclined face of the first mining working face to be wide k 1 ＜k 0 ；
c. Arranging an inclined face width k on the inclined side of the first mining working face 2 And satisfies k 1 +k 2 ＞k 0 ；
d. Arranging a plurality of grouting drill holes along the advancing direction of the second working surface, and constructing the final holes of the grouting drill holes to the bottom surface of the thick hard rock stratum closest to the coal bed;
e. along with the advance of the second working face, coal-based solid waste slurry is injected into the overlying strata through the grouting drill hole, and the grouting filling amount and the grouting filling pressure need to ensure that the deflection of the thick hard rock stratum closest to the coal bed is less than w 0 ；
f. An inclined surface width k is arranged on the inclined side of the second working surface 3 The third working surface is spaced from the compaction area in the goaf by a distance k y Let k be y +k 3 ＜k 0 ；
g. Arranging a plurality of grouting drill holes along the advancing direction of the third working face, and constructing the final holes of the grouting drill holes to the bottom surface of the thick hard rock stratum closest to the coal bed;
h. along with the advancing of the third working face, injecting coal-based solid waste slurry into the overlying strata through the grouting drill hole, and injecting the coal-based solid waste slurry into the overlying strata through the grouting drill hole, wherein the grouting filling amount and the grouting filling pressure need to ensure that the deflection of the thick hard rock stratum closest to the coal bed is less than w 0 ；
i. And f-h, referring to the third working surface to carry out subsequent working surface arrangement and grouting filling construction.
Wherein the coal-based solid waste slurry is fly ash and/or gangue powder slurry. The deflection of the thick hard rock stratum closest to the coal bed can be monitored in real time through the construction rock stratum movement monitoring drill hole, and the final hole of the rock stratum movement monitoring drill hole is constructed into the thick hard rock stratum closest to the coal bed.
Wherein the interval of the grouting drill holes is smaller than the breaking distance k of the thick hard rock stratum 0 。
The mine earthquake and rock burst prevention and control mechanism and the beneficial effects of the invention are as follows: the method uses overlying strata grouting filling which is traditionally used for ground surface subsidence reduction for preventing and controlling mine earthquake and rock burst, and improves the process; (1) selecting the grouting filling layer at the thick hard rock stratum which is closest to the coal bed and causes the mine earthquake to be generated, and controlling the thick hard rock stratum to have the deflection less than the maximum critical deflection w 0 Ensuring that the cable is not broken; the treatment is more targeted, and the grouting filling amount can be reduced, so that the filling cost is reduced, and the recovery efficiency is improved. (2) The first mining working face can be filled without grouting, so that a mining area can be put into production as soon as possible; meanwhile, according to the deflection change rule of the thick and hard rock stratum closest to the coal bed, the working face inclination face width is reasonably designed, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic plan view of the method for preventing and controlling mine earthquake and rock burst by overburden rock isolation grouting filling according to the invention;
in the figure: the method comprises the following steps of firstly mining a working face 1, a second working face 2, a third working face 3, grouting drill holes 4, a compaction area boundary 5 and monitoring drill holes 6.
Detailed Description
The technical solution of the present invention is described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.
The invention discloses a method for preventing and controlling mine earthquake and rock burst by overburden rock isolation grouting filling, which comprises the following steps:
a. determining the position of a thick hard rock layer causing the mine earthquake in the overlying strata based on the mine earthquake monitoring condition of a mined area or on the mechanical parameters of a drilling column and each rock layer, and determining the breaking of the thick hard rock layer closest to the coal bed and causing the mine earthquake by adopting numerical simulation or theoretical calculation (such as simplifying the thick hard rock layer into a beam for carrying out stress analysis)The fault distance and the maximum critical deflection at the time of fracture; when the thick hard rock stratum closest to the coal bed is not broken, the thick hard rock stratum at the upper part of the thick hard rock stratum cannot be broken naturally, namely the most important thing for controlling the mine earthquake is to control the thick hard rock stratum closest to the coal bed and causing the mine earthquake not to be broken; taking a certain Shandong mine as an example, determining that a huge thick sandstone layer group with the thickness of more than 60m exists in overlying strata according to a drilling column, wherein the huge thick sandstone layer group is about 320m away from a coal seam and generates a mineral shock when being broken, and determining the breaking distance k of the huge thick sandstone layer group based on mechanical parameters 0 About 440m, maximum deflection at break w 0 Can reach 3.2m;
b. arranging a first mining working face 1 in the mining area, and enabling the inclined face width k of the first mining working face 1 1 ＜k 0 (ii) a Stoping of the first mining working face 1 is carried out, overlying strata grouting filling is not carried out, so that the mining area can be put into production as soon as possible, and the generation of mine earthquake and rock burst is avoided; specifically, the inclined face width k of the designed first mining face 1 250m, the propulsion length is 2050m and the mining height is 5.9m; due to the inclined face width k of the first mining face 1 1 ＜k 0 Even if the trend propulsion length is far greater than the trend width, the thick and hard rock stratum which is closest to the coal bed and is generated by the mine earthquake cannot be broken, namely the mine earthquake with rock burst cannot be generated;
c. in the mining area, a second working face 2 is arranged on the inclined side of the first mining working face 1, so that the inclined face width k of the first mining working face 1 1 Width k of inclined surface with respect to the second working surface 2 2 The sum is greater than the breaking distance k 0 I.e. k 1 +k 2 ＞k 0 (ii) a Specifically, the inclined surface width k of the second working surface 2 Is 250m, k 1 +k 2 ＝500m＞k 0 =440m; after the first working face 1 recovers, because the deflection generated by the thick hard rock layer closest to the coal bed is smaller and the condition of breaking is far not met, the inclination face width of the second working face 2 can be set to be larger, the recovery efficiency is improved, and meanwhile, the grouting filling is matched to prevent and control mine earthquake and rock burst;
d. a plurality of grouting drill holes 4 are arranged along the propelling direction of the second working surface 2, the grouting drill holes 4 are close to one side of the first mining working surface 1, and the final holes of the grouting drill holes 4 are constructed to be guidedThe bottom surface of the thick hard rock stratum which is closest to the coal bed and is generated by the mineral earthquake, namely the grouting layer is positioned below the thick hard rock stratum which is closest to the coal bed and is generated by the mineral earthquake; specifically, one grouting drill hole 4 is arranged at intervals of about 400m along the advancing direction of the working face, and the distance between the grouting drill holes is smaller than the breaking distance k 0 The final hole of the grouting drill hole is constructed to be 320m away from the coal seam (at the moment, the grouting layer, namely the rock stratum between the final hole of the grouting drill hole and the water flowing fractured zone, forms an isolation layer), the first grouting drill hole 6 is 210m away from the cutting hole, and about half of the breaking distance k is formed 0 ；
e. Along with the propulsion of the second working surface 2, injecting coal-based solid waste slurry into the overlying strata through the grouting drill holes 4, wherein the coal-based solid waste slurry is coal ash and/or gangue powder slurry; the grouting filling amount and the grouting filling pressure need to ensure that the deflection of the thick hard rock stratum closest to the coal bed is less than w 0 (ii) a Specifically, the deflection is controlled to be less than 2.0m, and the broken rock mass in the goaf is compacted through grouting filling to form a compaction area with a certain width. In addition, a rock stratum movement monitoring drill hole 6 can be constructed in the working face, the final hole of the rock stratum movement monitoring drill hole 6 is constructed into a thick hard rock stratum which is closest to the coal bed, the deflection of the thick hard rock stratum is monitored in real time, and the maximum deflection of the thick hard rock stratum is inverted through numerical simulation; specifically, the final hole is constructed to be 340m away from the coal seam, 3 measuring points are arranged in the monitoring drill hole 6 at an interval of 10m from the bottom of the hole upwards, and the monitoring accuracy is improved;
f. a third working surface 3 is arranged on the inclined side of the second working surface 2, and the inclined surface width of the third working surface 3 is k 3 And the distance from the compaction area in the goaf is k y Let k be y +k 3 ＜k 0 (ii) a In the compaction area in the goaf, the broken rock mass is compacted due to the grouting filling effect, so that the support effect similar to a coal pillar is achieved, and k y +k 3 ＜k 0 The inclination width of the thick hard rock stratum closest to the coal bed between the compaction area and the coal pillar on the other side of the third working surface 3 is smaller than the breaking distance, so that the possibility of mine shock and rock burst caused by breaking can be reduced; specifically, the distance of the third working surface of the compaction area is estimated to be about 182m according to the grouting horizon and the collapse angle of the rock stratum, and then the third working surface k 3 The maximum can be designed to be 258m for protectionThe inclined surface width of the third working surface is designed to be 230m to ensure safety.
After the second working face 2 recovers, the deflection generated by the thick and hard rock stratum closest to the coal bed is increased compared with the deflection generated after the first mining working face recovers, so the inclined face width of the third working face 3 is properly reduced to reduce the possibility of generating mine shock and rock burst;
g. arranging a plurality of grouting drill holes 4 along the advancing direction of the third working surface 3, wherein the grouting drill holes 4 are close to the second working surface 2, and the final holes of the grouting drill holes are constructed to the bottom surface of the thick hard rock stratum closest to the coal bed, namely the grouting layer is positioned below the thick hard rock stratum closest to the coal bed; the distance and depth of the grout holes are the same as those of the grout holes in the second working face.
h. Along with the propulsion of the third working surface 3, injecting coal-based solid waste slurry into the overlying strata through the grouting drill holes 4, wherein the coal-based solid waste slurry is coal ash and/or gangue powder slurry; the grouting filling amount and the grouting filling pressure need to ensure that the deflection of the thick hard rock stratum closest to the coal bed is less than w 0 (ii) a Specifically, the deflection is controlled to be less than 2.0m and not more than 2.2m at most; compacting the broken rock mass in the goaf by grouting filling to form a compaction area with a certain width; in addition, a rock stratum movement monitoring drill hole 6 can be constructed in the working face, the final hole of the rock stratum movement monitoring drill hole 6 is constructed into a thick hard rock stratum closest to the coal bed, the deflection of the thick hard rock stratum is monitored in real time, and the maximum deflection of the thick hard rock stratum is inverted through numerical simulation; or directly placing the formation movement monitoring borehole 6 at the maximum deflection generating position of the thick hard formation; the design scheme of the specific rock stratum certain monitoring borehole is the same as that of the arrangement e.
i. And f-h, referring to the third working surface 3, arranging the subsequent working surfaces, grouting and filling to prevent and control mine earthquake and rock burst. After the third working face is recovered, the maximum deflection generated by the thick hard rock stratum closest to the coal bed is basically stable and remains unchanged, so that the subsequent working face arrangement scheme and the grouting filling scheme can be realized by referring to the third working face. Specifically, the face width of the fourth working face is also designed to be 230m, and the grouting drilling arrangement scheme is the same as that of the third working face.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (4)
1. The method for preventing and controlling the mine earthquake and the rock burst by overlying strata isolation grouting filling is characterized by comprising the following steps of:
a. determining the position of a thick hard rock layer in the overlying strata, which causes the generation of the mine earthquake, and calculating the breaking distance k of the thick hard rock layer closest to the coal seam 0 And a maximum critical deflection w at rupture 0 ；
b. Arranging a first mining working face in a mining area, carrying out stoping, not carrying out overlying strata grouting filling, and enabling the inclined face of the first mining working face to be wide k 1 ＜k 0 ；
c. Arranging an inclined face width k on the inclined side of the first mining working face 2 And satisfies k 1 +k 2 ＞k 0 ；
d. Arranging a plurality of grouting drill holes along the advancing direction of the second working surface, and constructing the final holes of the grouting drill holes to the bottom surface of the thick hard rock stratum closest to the coal bed;
e. along with the advance of the second working face, coal-based solid waste slurry is injected into the overlying strata through the grouting drill hole, and the grouting filling amount and the grouting filling pressure need to ensure that the deflection of the thick hard rock stratum closest to the coal bed is less than w 0 ；
f. An inclined surface width k is arranged on the inclined side of the second working surface 3 The third working surface is spaced from the compaction area in the goaf by a distance k y Let k be y +k 3 ＜k 0 ；
g. Arranging a plurality of grouting drill holes along the advancing direction of the third working face, and constructing the final holes of the grouting drill holes to the bottom surface of the thick hard rock stratum closest to the coal bed;
h. along with the propulsion of the third working face, coal-based solid waste slurry is injected into the overlying strata through the grouting drill hole, and the grouting filling amount and the grouting filling are carried outThe pressure needs to ensure that the deflection of the thick hard rock stratum closest to the coal bed is less than w 0 ；
i. And f-h, referring to the third working surface to carry out subsequent working surface arrangement and grouting filling construction.
2. The method for preventing and treating mine shake and rock burst according to claim 1, wherein the coal-based solid waste slurry is fly ash and/or gangue powder slurry.
3. The method for preventing and treating mine earthquake and rock burst according to claim 1, wherein the deflection of the thick hard rock stratum closest to the coal seam is monitored in real time by constructing a rock stratum movement monitoring borehole, and the final hole of the rock stratum movement monitoring borehole is constructed into the thick hard rock stratum closest to the coal seam.
4. The method for preventing and treating mine earthquake and rock burst according to claim 1, wherein the distance between grouting drill holes is smaller than the breaking distance k of thick hard rock stratum nearest to coal bed 0 。
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| CN117370727B (en) * | 2023-10-24 | 2024-07-05 | 山东能源集团有限公司 | Overlying strata separation layer grouting settlement-reducing earthquake evaluation method |
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