CN117248908A - Near-vertical coal seam ground pressure impact control method - Google Patents
Near-vertical coal seam ground pressure impact control method Download PDFInfo
- Publication number
- CN117248908A CN117248908A CN202311442294.9A CN202311442294A CN117248908A CN 117248908 A CN117248908 A CN 117248908A CN 202311442294 A CN202311442294 A CN 202311442294A CN 117248908 A CN117248908 A CN 117248908A
- Authority
- CN
- China
- Prior art keywords
- drilling
- stress
- area
- drilling hole
- preset
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000005553 drilling Methods 0.000 claims abstract description 239
- 238000005065 mining Methods 0.000 claims abstract description 58
- 238000005422 blasting Methods 0.000 claims abstract description 20
- 239000011435 rock Substances 0.000 abstract description 12
- 230000003405 preventing effect Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 230000001276 controlling effect Effects 0.000 description 9
- 239000002360 explosive Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The application provides a method for preventing and controlling ground pressure impact of a near-vertical coal seam. The method comprises the following steps: in the mining process of a mining area, obtaining stress concentration coefficients of a plurality of position points of the mining area; determining a high stress area according to stress concentration coefficients of all position points of the mining area; drilling holes in the deep part of the top plate of the high-stress area and the deep part of the bottom plate of the high-stress area, blasting the drilling holes in the top plate of the high-stress area and the drilling holes in the bottom plate of the high-stress area, and drilling holes in the deep part of the nearly vertical coal seam of the high-stress area so as to reduce the probability of ground pressure impact of a part of a first roadway contained in the high-stress area and reduce the probability of ground pressure impact of a part of a second roadway contained in the high-stress area. The method solves the problem that the control effect of roadway rock burst is not ideal in the area with very high stress of the near-vertical coal seam goaf by adopting a top-bottom pressure relief blasting mode in the prior art.
Description
Technical Field
The application relates to the technical field of mines, in particular to a method for preventing and controlling ground pressure impact of a near-vertical coal seam.
Background
Because of the special occurrence characteristics of coal and rock in the near-vertical coal seam, the rock burst occurrence depth is earlier than that of a horizontal or gently inclined coal seam, the rock burst danger faced in the coal mining process of the near-vertical coal seam is relatively stronger, the current rock burst control method of the near-vertical coal seam is to perform pressure relief blasting on the top and bottom plates of a stress concentration zone, but in practical terms, the control effect of roadway rock burst in the zone with very high stress of the near-vertical coal seam goaf is not ideal by adopting the pressure relief blasting mode of the top and bottom plates.
Disclosure of Invention
The main purpose of the application is to provide a method for preventing and controlling the ground pressure impact of a near-vertical coal seam, which at least solves the problem that the preventing and controlling effect on the ground pressure impact of a roadway in a region with very high stress of a near-vertical coal seam goaf is not ideal in the prior art by adopting a top-bottom plate pressure relief blasting mode.
In order to achieve the above object, according to one aspect of the present application, there is provided a method for preventing and controlling a ground strike of a near-vertical coal seam, a mining area including a first tunnel, a near-vertical coal seam, and a second tunnel, one side of the first tunnel being a roof, the other side of the first tunnel being a near-vertical coal seam, one side of the second tunnel being the near-vertical coal seam, the other side of the second tunnel being a floor, the method comprising: in the mining process of the mining area, acquiring stress concentration coefficients of a plurality of position points of the mining area; determining a high stress zone according to the stress concentration coefficients of the position points of the mining zone, wherein the high stress zone comprises a partial region of the nearly vertical coal seam, a partial region of the first roadway and a partial region of the second roadway, and the stress concentration coefficients of a plurality of the position points in the high stress zone are all larger than preset stress concentration coefficients; drilling holes in the deep part of the top plate of the high-stress area and the deep part of the bottom plate of the high-stress area, blasting the drilling holes in the top plate of the high-stress area and the drilling holes in the bottom plate of the high-stress area, and drilling holes in the deep part of the nearly vertical coal seam of the high-stress area so as to reduce the probability of occurrence of ground pressure impact in the partial area of the first roadway contained in the high-stress area and reduce the probability of occurrence of ground pressure impact in the partial area of the second roadway contained in the high-stress area.
Optionally, drilling a borehole into a deep portion of the near-vertical coal seam of the high stress zone, comprising: and drilling multiple rows of drilling holes in sequence towards the deep part of the nearly vertical coal seam of the high-stress area along a first direction, wherein the first direction is the mining direction of the mining area, the distribution direction of the drilling holes in each row of drilling holes is parallel to a second direction, and the second direction is perpendicular to the first direction.
Optionally, in the process of sequentially drilling multiple rows of drill holes into the deep part of the near-vertical coal seam of the high-stress area along the first direction, the method comprises the following steps: in the process of drilling each row of drilling holes, a first drilling hole, a second drilling hole and a third drilling hole are sequentially drilled along the second direction, the depth of the first drilling hole, the depth of the second drilling hole and the depth of the third drilling hole are all located in a first preset depth range, the diameter of the first drilling hole, the diameter of the second drilling hole and the diameter of the third drilling hole are all located in a first preset diameter range, an included angle between the first drilling hole and the first direction is a first preset angle, an included angle between the second drilling hole and the first direction is a second preset angle, an included angle between the third drilling hole and the first direction is a third preset angle, and the first preset angle is smaller than the second preset angle and smaller than the third preset angle.
Optionally, drilling a borehole into both a deep portion of a top plate of the high stress region and a deep portion of a bottom plate of the high stress region, comprising: and drilling multiple rows of drilling holes towards the deep part of the top plate of the high-stress area and the deep part of the bottom plate of the high-stress area along a first direction, wherein the first direction is the mining direction of the mining area, the distribution direction of the drilling holes in each row of drilling holes is parallel to a second direction, and the second direction is perpendicular to the first direction.
Optionally, in the process of drilling multiple rows of drill holes towards the deep part of the top plate of the high stress region and the deep part of the bottom plate of the high stress region along the first direction, the method comprises the following steps: in the process of drilling each row of drilling holes, at least a fourth drilling hole and a fifth drilling hole are drilled in sequence along the second direction, the depth of the fourth drilling hole and the depth of the fifth drilling hole are both in a second preset depth range, the diameter of the fourth drilling hole and the diameter of the fifth drilling hole are both first preset diameters, an included angle between the fourth drilling hole and the first direction is a fourth preset angle, an included angle between the fifth drilling hole and the first direction is a fifth preset angle, and the fifth preset angle is larger than the fourth preset angle.
Optionally, drilling at least a fourth drilling hole and a fifth drilling hole sequentially along the second direction includes: and sequentially drilling the fourth drilling hole, the fifth drilling hole, the sixth drilling hole and the seventh drilling hole along the second direction, wherein the depth of the sixth drilling hole and the depth of the seventh drilling hole are both the first preset depth, the diameter of the sixth drilling hole and the diameter of the seventh drilling hole are both the first preset diameter, the included angle between the sixth drilling hole and the first direction is a sixth preset angle, the included angle between the seventh drilling hole and the first direction is a seventh preset angle, the first preset depth is larger than the upper limit value of the second preset depth range, the seventh preset angle is larger than the sixth preset angle, and the seventh preset angle is smaller than the fourth preset angle.
Optionally, after obtaining the stress concentration coefficients for the plurality of location points of the mining area, including: determining a low stress zone according to the stress concentration coefficients of the position points of the mining zone, wherein the low stress zone comprises a partial region of the nearly vertical coal seam, a partial region of the first roadway and a partial region of the second roadway, and the stress concentration coefficients of a plurality of the position points in the low stress zone are smaller than or equal to preset stress concentration coefficients; drilling holes into the deep part of the top plate of the low stress area and the deep part of the bottom plate of the low stress area, and blasting the holes of the top plate of the low stress area and the holes of the bottom plate of the low stress area.
Optionally, drilling a borehole into both a deep portion of the top plate of the low stress region and a deep portion of the bottom plate of the low stress region, comprising: and drilling multiple rows of drilling holes towards the deep part of the top plate of the low-stress area and the deep part of the bottom plate of the low-stress area along a first direction, wherein the first direction is the mining direction of the mining area, the distribution direction of the drilling holes in each row of drilling holes is parallel to a second direction, and the second direction is perpendicular to the first direction.
Optionally, drilling multiple rows of holes into a deep portion of the top plate of the low stress region and a deep portion of the bottom plate of the low stress region in a first direction, including: in the process of drilling each row of drilling holes, at least an eighth drilling hole and a ninth drilling hole are drilled in sequence along the second direction, the depth of the eighth drilling hole and the depth of the ninth drilling hole are in a third preset depth range, the diameter of the eighth drilling hole and the diameter of the ninth drilling hole are both second preset diameters, an included angle between the eighth drilling hole and the first direction is an eighth preset angle, an included angle between the ninth drilling hole and the first direction is a ninth preset angle, and the ninth preset angle is larger than the eighth preset angle.
Optionally, during drilling each row of drill holes, at least an eighth drill hole and a ninth drill hole are sequentially drilled along the second direction, including: along the second direction, drill in proper order eighth drilling, ninth drilling, tenth drilling, eleventh drilling, the degree of depth of tenth drilling with the degree of depth of eleventh drilling is the second and presets the degree of depth, the diameter of tenth drilling with the diameter of eleventh drilling is the second presets the diameter, the angle of tenth drilling with the first direction is tenth presets the angle, the angle of eleventh drilling with the first direction is eleventh presets the angle, the second presets the degree of depth and is greater than the third presets the upper limit value of degree of depth scope, eleventh presets the angle and is greater than tenth presets the angle, eleventh presets the angle and is less than eighth presets the angle.
By means of the technical scheme, firstly, the high-stress area is determined, namely, the area with very high stress concentration degree is determined, then, the deep part of the top and bottom plates of the high-stress area is drilled and blasted, meanwhile, the deep part of the near-vertical coal seam of the high-stress area is drilled, compared with the mode of pressure relief blasting of the top and bottom plates in the prior art, the probability of ground pressure impact of a roadway of the high-stress area is further reduced, and the problem that the effect of preventing and controlling the roadway impact ground pressure of the area with very high stress of the near-vertical coal seam goaf is not ideal in the mode of pressure relief blasting of the top and bottom plates in the prior art is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 shows a schematic flow chart of a method for preventing and controlling the ground pressure impact of a near-vertical coal seam according to an embodiment of the application;
FIG. 2 illustrates a schematic view of a borehole location provided in accordance with an embodiment of the present application;
FIG. 3 illustrates another borehole position schematic provided in accordance with an embodiment of the present application;
FIG. 4 illustrates a schematic view of a microseismic energy distribution at various locations of a mining area prior to releasing pressure from the mining area, provided in accordance with an embodiment of the present application;
fig. 5 illustrates a schematic diagram of microseismic energy distribution at various locations of a mining area after pressure relief of the mining area, in accordance with an embodiment of the present application.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
For convenience of description, the following will describe some terms or terms related to the embodiments of the present application:
rock burst: the underground pressure change caused by ground subsidence and ground surface deformation generated by mining activities in an underground mine is meant, when the mine is mined, rock and soil in the mine are deformed and subsided after the ore is mined, so that the underground pressure change is caused, and the underground pressure change can cause ground subsidence, ground cracks and even inclination and damage of a building.
As described in the background art, in the prior art, a roof-bottom plate pressure relief blasting mode is adopted singly, so that the control effect on the roadway rock burst of the region with very high stress of the near-vertical coal seam goaf is not ideal, and the embodiment of the application provides a method for controlling the roadway rock burst of the region with very high stress of the near-vertical coal seam goaf, which aims to solve the problem that the control effect on the roadway rock burst of the region with very high stress of the near-vertical coal seam goaf is not ideal in the prior art by adopting the roof-bottom plate pressure relief blasting mode singly.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In this embodiment a near vertical coal seam ground pressure shock control method is provided and although a logic sequence is shown in the flow chart, in some cases the steps shown or described may be performed in a different order than that shown or described herein.
The mining area comprises a first tunnel, a near-vertical coal seam and a second tunnel, wherein one side of the first tunnel is a top plate, the other side of the first tunnel is a near-vertical coal seam, one side of the second tunnel is the near-vertical coal seam, and the other side of the second tunnel is a bottom plate.
Fig. 1 is a flow chart of a near-vertical coal seam ground pressure shock control method according to an embodiment of the present application. As shown in fig. 1, the method comprises the steps of:
step S101, obtaining stress concentration coefficients of a plurality of position points of the mining area in the mining process of the mining area;
step S102, determining a high stress area according to the stress concentration coefficient of each position point of the mining area;
the high stress area comprises a partial area of the near-vertical coal seam, a partial area of the first roadway and a partial area of the second roadway, and stress concentration coefficients of a plurality of position points in the high stress area are all larger than a preset stress concentration coefficient;
specifically, the stress concentration coefficient of a position point is the ratio of the stress of the position point in the process of mining a mining area to the stress of the position point before mining the mining area, and the value range of the preset stress concentration coefficient is 2-3.
Step S103, drilling holes in the deep part of the top plate of the high-stress area and the deep part of the bottom plate of the high-stress area, blasting the drilling holes in the top plate of the high-stress area and the drilling holes in the bottom plate of the high-stress area, and drilling holes in the deep part of the nearly vertical coal seam of the high-stress area so as to reduce the probability of occurrence of ground pressure impact in the partial area of the first roadway contained in the high-stress area and reduce the probability of occurrence of ground pressure impact in the partial area of the second roadway contained in the high-stress area.
Through the embodiment, firstly, the high stress area is determined, namely, the area with very high stress concentration degree is determined, then, the deep part of the top and bottom plates of the high stress area is drilled and blasted, meanwhile, the deep part of the near-vertical coal seam of the high stress area is drilled, compared with the mode of pressure relief blasting of the top and bottom plates in the prior art, the probability of ground pressure impact of a roadway of the high stress area is further reduced, and the problem that the effect of preventing and treating the roadway rock impact of the area with very high stress of the near-vertical coal seam goaf is not ideal in the prior art is solved by adopting the mode of pressure relief blasting of the top and bottom plates.
To further reduce the probability of occurrence of ground pressure impact in the roadway of the high-stress zone, in some alternative embodiments, deep drilling of the near-vertical coal seam to the high-stress zone in the step S103 may be implemented as:
step S1031, drilling multiple rows of drilling holes in sequence towards the deep part of the near-vertical coal seam of the high-stress area along a first direction, wherein the first direction is the mining direction of the mining area, the distribution direction of the drilling holes in each row of drilling holes is parallel to a second direction, and the second direction is perpendicular to the first direction;
specifically, as shown in fig. 2, the direction indicated by the arrow is a first direction, and multiple rows of drill holes are drilled in the deep part of the near-vertical coal seam of the first roadway along the first direction so as to further unload the pressure of the near-vertical coal seam of the high-stress area to the first roadway of the high-stress area, and multiple rows of drill holes are drilled in the deep part of the near-vertical coal seam of the second roadway along the first direction so as to further unload the pressure of the near-vertical coal seam of the high-stress area to the second roadway of the high-stress area, thereby further reducing the probability of the roadway of the high-stress area from generating ground pressure impact.
In order to further reduce the probability of ground pressure impact of the roadway in the high-stress area, in an alternative embodiment, the step S1031 may be implemented as follows:
in the process of drilling each row of drilling holes, sequentially drilling a first drilling hole, a second drilling hole and a third drilling hole along the second direction, wherein the depth of the first drilling hole, the depth of the second drilling hole and the depth of the third drilling hole are all in a first preset depth range, the diameter of the first drilling hole, the diameter of the second drilling hole and the diameter of the third drilling hole are all in a first preset diameter range, the included angle between the first drilling hole and the first direction is a first preset angle, the included angle between the second drilling hole and the first direction is a second preset angle, the included angle between the third drilling hole and the first direction is a third preset angle, the first preset angle is smaller than the second preset angle, and the second preset angle is smaller than the third preset angle.
Specifically, the first preset depth range is 20-30 m, the first preset diameter range is 110-150 mm, the first preset angle is 20 degrees, the second preset angle is 45 degrees, the third preset angle is 65 degrees, as shown in fig. 3, when each row of holes is drilled in the deep part of the near-vertical coal seam of the first roadway, the first holes (with an included angle of 20 degrees with respect to the first direction), the second holes (with an included angle of 45 degrees with respect to the first direction) and the third holes (with an included angle of 65 degrees with respect to the first direction) are drilled in sequence along the second direction when each row of holes are drilled in the deep part of the near-vertical coal seam of the second roadway, so that the pressure of the near-vertical coal seam of the high stress area on the first roadway is further unloaded, and the probability of the pressure of the near-vertical coal seam of the high stress area on the high-stress area is further reduced.
In order to further reduce the probability of occurrence of ground pressure impact in the roadway of the high-stress area, drilling holes into the deep portion of the top plate of the high-stress area and the deep portion of the bottom plate of the high-stress area in the step S301 may be implemented as follows:
step S3012, drilling multiple rows of drill holes in a first direction, wherein the first direction is a mining direction of the mining area, a distribution direction of drill holes in each row of drill holes is parallel to a second direction, and the second direction is perpendicular to the first direction.
Specifically, as shown in fig. 2, the direction indicated by the arrow is a first direction, and multiple rows of drilling holes are drilled in the first roadway towards the deep part of the top plate along the first direction so as to further unload the pressure of the top plate in the high-stress area to the first roadway in the high-stress area, and multiple rows of drilling holes are drilled in the second roadway along the first direction towards the deep part of the bottom plate so as to further unload the pressure of the bottom plate in the high-stress area to the second roadway in the high-stress area, thereby further reducing the probability of ground pressure impact of the roadway in the high-stress area.
In order to further reduce the probability of ground pressure impact of the roadway in the high-stress area, the step S3012 may be implemented as follows:
step S30121, drilling a fourth drilling hole and a fifth drilling hole in sequence along the second direction, wherein the depth of the fourth drilling hole and the depth of the fifth drilling hole are both in a second preset depth range, the diameter of the fourth drilling hole and the diameter of the fifth drilling hole are both a first preset diameter, the included angle between the fourth drilling hole and the first direction is a fourth preset angle, the included angle between the fifth drilling hole and the first direction is a fifth preset angle, and the fifth preset angle is greater than the fourth preset angle.
Specifically, the second preset depth range is 25-35 m, the first preset diameter is 113mm, the fourth preset angle is 45 degrees, the fifth preset angle is 60 degrees, as shown in fig. 3, when the first roadway drills each row of holes towards the deep part of the top plate, the fourth holes (with an included angle of 45 degrees with the first direction) and the fifth holes (with an included angle of 60 degrees with the first direction) are sequentially drilled along the second direction, so that the pressure of the top plate of the high stress area to the first roadway of the high stress area is further unloaded, when the second roadway drills each row of holes towards the deep part of the bottom plate, the fourth holes (with an included angle of 45 degrees with the first direction) and the fifth holes (with an included angle of 60 degrees with the first direction) are sequentially drilled along the second direction, and the pressure of the bottom plate of the high stress area to the second roadway of the high stress area is further unloaded, and the probability of the pressure impact of the roadway of the high stress area is further reduced.
In order to further reduce the probability of ground pressure impact of the roadway in the high stress region, the step S30121 may be implemented as follows:
and sequentially drilling the fourth drilling hole, the fifth drilling hole, a sixth drilling hole and a seventh drilling hole along the second direction, wherein the depth of the sixth drilling hole and the depth of the seventh drilling hole are both first preset depths, the diameter of the sixth drilling hole and the diameter of the seventh drilling hole are both the first preset diameters, the included angle between the sixth drilling hole and the first direction is a sixth preset angle, the included angle between the seventh drilling hole and the first direction is a seventh preset angle, the first preset depth is larger than the upper limit value of the second preset depth range, the seventh preset angle is larger than the sixth preset angle, and the seventh preset angle is smaller than the fourth preset angle.
Specifically, the second preset depth range is 25-35 m, the first preset depth is 50m, the first preset diameter is 113mm, the fourth preset angle is 45 °, the fifth preset angle is 60 °, the sixth preset angle is 25 °, the seventh preset angle is 35 °, as shown in fig. 3, when the first roadway drills each row of holes toward the deep portion of the top plate, the fourth holes (45 ° to the first direction), the fifth holes (60 ° to the first direction), the sixth holes (25 ° to the first direction), the seventh holes (35 ° to the first direction) are sequentially drilled along the second direction, the fourth holes (45 ° to the first direction), the fifth holes (60 ° to the first direction) are sequentially drilled along the second direction, the seventh holes (25 ° to the first direction) are sequentially drilled along the second direction, and the pressure of the top plate of the high stress area is further unloaded, so that the high probability of the roadway is further reduced, and the high probability of the high pressure area is further unloaded.
Specifically, as shown in fig. 3, the solid line represents a hole sealing section, the broken line represents a charging section, wherein the hole sealing section is a part of the drill hole in which no explosive is contained, and the charging section is a part of the drill hole in which the explosive is contained, wherein the lengths of the charging sections of the fourth drill hole and the fifth drill hole are 15-23 m, and the lengths of the charging sections of the sixth drill hole and the seventh drill hole are 20m.
In order to reduce the probability of ground pressure impact of the roadway in the stress area and reduce the cost, after step S101, the method further includes:
step S201, determining a low stress zone according to the stress concentration coefficients of the position points of the mining area, wherein the low stress zone comprises a partial area of the near-vertical coal seam, a partial area of the first roadway and a partial area of the second roadway, and the stress concentration coefficients of a plurality of position points in the low stress zone are smaller than or equal to preset stress concentration coefficients;
step S202, drilling holes in the deep part of the top plate of the low stress area and the deep part of the bottom plate of the low stress area, and blasting the drilling holes of the top plate of the low stress area and the drilling holes of the bottom plate of the low stress area.
Specifically, a low stress area is determined, namely, an area with low stress concentration degree is determined, then, the deep part of the top and bottom plates of the low stress area is drilled and blasted, and due to the low stress concentration degree of the low stress area, the roadway of the low stress area can be completely prevented from being subjected to ground pressure impact by adopting a pressure relief blasting mode of the top and bottom plates, namely, only the deep part of the top and bottom plates of the high stress area is drilled and blasted, and meanwhile, the deep part of the near-vertical coal seam of the high stress area is drilled, so that the cost is reduced.
In order to further reduce the probability of ground pressure impact of the roadway in the stress region, drilling holes into the deep portion of the top plate of the low stress region and the deep portion of the bottom plate of the low stress region in step S202 may be implemented as follows:
in step S2011, multiple rows of drill holes are drilled in a first direction, wherein the first direction is a mining direction of the mining area, the distribution direction of the drill holes in each row of drill holes is parallel to a second direction, and the second direction is perpendicular to the first direction.
Specifically, multiple rows of drilling holes are drilled in the first roadway towards the deep part of the top plate along the first direction so as to further unload the pressure of the top plate in the low stress area to the first roadway in the low stress area, multiple rows of drilling holes are drilled in the second roadway towards the deep part of the bottom plate along the first direction so as to further unload the pressure of the bottom plate in the low stress area to the second roadway in the low stress area, and therefore the probability of ground pressure impact of the roadway in the low stress area is further reduced.
In order to further reduce the probability of ground pressure impact of the roadway in the stress area, the step S2011 may be implemented as follows:
step S20111, in the process of drilling each row of holes, drilling an eighth hole and a ninth hole along the second direction, wherein the depth of the eighth hole and the depth of the ninth hole are both in a third preset depth range, the diameter of the eighth hole and the diameter of the ninth hole are both in a second preset diameter, the included angle between the eighth hole and the first direction is an eighth preset angle, the included angle between the ninth hole and the first direction is a ninth preset angle, and the ninth preset angle is greater than the eighth preset angle.
Specifically, the third preset depth range is 25-35 m, the second preset diameter is 113mm, the eighth preset angle is 45 degrees, the ninth preset angle is 60 degrees, when the first roadway drills each row of holes to the deep part of the top plate, the eighth holes (with an included angle of 45 degrees with the first direction) and the ninth holes (with an included angle of 60 degrees with the first direction) are sequentially drilled along the second direction, so that the pressure of the top plate of the low stress area to the first roadway of the low stress area is further unloaded, when the second roadway drills each row of holes to the deep part of the bottom plate, the eighth holes (with an included angle of 45 degrees with the first direction) and the ninth holes (with an included angle of 60 degrees with the first direction) are sequentially drilled along the second direction, and the pressure of the bottom plate of the low stress area to the first roadway of the low stress area is further unloaded, so that the probability of the pressure impact of the roadway of the low stress area is further reduced.
In order to further reduce the probability of ground pressure impact of the roadway in the stress area, the step S20111 may be implemented as follows:
and sequentially drilling the eighth drilling hole, the ninth drilling hole, a tenth drilling hole and an eleventh drilling hole along the second direction, wherein the depth of the tenth drilling hole and the depth of the eleventh drilling hole are both second preset depths, the diameter of the tenth drilling hole and the diameter of the eleventh drilling hole are both the second preset diameters, the included angle between the tenth drilling hole and the first direction is a tenth preset angle, the included angle between the eleventh drilling hole and the first direction is an eleventh preset angle, the second preset depth is larger than the upper limit value of the third preset depth range, the eleventh preset angle is larger than the tenth preset angle, and the eleventh preset angle is smaller than the eighth preset angle.
Specifically, the third preset depth range is 25-35 m, the second preset depth is 50m, the second preset diameter is 113mm, the eighth preset angle is 45 degrees, the ninth preset angle is 60 degrees, the tenth preset angle is 25 degrees, the eleventh preset angle is 35 degrees, when each row of holes is drilled in the deep part of the top plate in the first roadway, the eighth holes (45 degrees with respect to the first direction), the ninth holes (60 degrees with respect to the first direction), the tenth holes (25 degrees with respect to the first direction), the eleventh holes (35 degrees with respect to the first direction) are drilled in sequence along the second direction, the top plate of the low stress zone is further unloaded with respect to the pressure of the first roadway of the low stress zone, when each row of holes is drilled in the deep part of the bottom plate in the second roadway, the eighth holes (45 degrees with respect to the first direction), the ninth holes (60 degrees with respect to the first direction), the tenth holes (25 degrees with respect to the first direction), the eleventh holes (35 degrees with respect to the first direction) are drilled in sequence along the second direction, and the probability of further unloading the top plate of the low stress zone is unloaded with respect to the first roadway of the low stress zone is further unloaded with respect to the low stress zone.
Specifically, the hole sealing section is a part without explosive in the drilling hole, and the explosive charging section is a part with explosive in the drilling hole, wherein the lengths of the explosive charging sections of the eighth drilling hole and the ninth drilling hole are 15-23 m, and the lengths of the explosive charging sections of the tenth drilling hole and the eleventh drilling hole are 20m.
Specifically, as shown in fig. 4 and 5, black pentagons represent that the microseismic energy is between 1.0e+05 and 1.0e+08, grey circles represent that the microseismic energy is between 1.0e+04 and 1.0e+05, black squares represent that the microseismic energy is between 1.0e+03 and 1.0e+04, grey triangles represent that the microseismic energy is between 0.0e+00 and 1.0e+03, as shown in fig. 4, the microseismic energy of each position point of the mining area is very high before the mining area is relieved by adopting the near-vertical coal seam ground pressure impact prevention method, the probability of ground pressure impact of the mining area is very high, as shown in fig. 5, after the mining area is relieved by adopting the near-vertical coal seam ground pressure impact prevention method, the microseismic energy of each position point of the mining area is greatly reduced, and the probability of ground pressure impact of the mining area is greatly reduced.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or 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 apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
in the method for preventing and controlling the ground pressure impact of the near-vertical coal seam, firstly, a high stress area is determined, namely, an area with very high stress concentration degree is determined, then, the deep part of the top and bottom plates of the high stress area is drilled and blasted, meanwhile, the deep part of the near-vertical coal seam of the high stress area is drilled, compared with the mode of pressure relief blasting of the top and bottom plates in the prior art, the probability of ground pressure impact of a roadway of the high stress area is further reduced, and the problem that the preventing and controlling effect on the ground pressure impact of the roadway of the area with very high stress of the near-vertical coal seam goaf is not ideal in the mode of pressure relief blasting of the top and bottom plates in the prior art is solved.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. The method is characterized in that a mining area comprises a first roadway, a near-vertical coal seam and a second roadway, one side of the first roadway is a top plate, the other side of the first roadway is the near-vertical coal seam, one side of the second roadway is the near-vertical coal seam, and the other side of the second roadway is a bottom plate, and the method comprises the following steps:
in the mining process of the mining area, acquiring stress concentration coefficients of a plurality of position points of the mining area;
determining a high stress zone according to the stress concentration coefficients of the position points of the mining zone, wherein the high stress zone comprises a partial region of the nearly vertical coal seam, a partial region of the first roadway and a partial region of the second roadway, and the stress concentration coefficients of a plurality of the position points in the high stress zone are all larger than preset stress concentration coefficients;
drilling holes in the deep part of the top plate of the high-stress area and the deep part of the bottom plate of the high-stress area, blasting the drilling holes in the top plate of the high-stress area and the drilling holes in the bottom plate of the high-stress area, and drilling holes in the deep part of the nearly vertical coal seam of the high-stress area so as to reduce the probability of occurrence of ground pressure impact in the partial area of the first roadway contained in the high-stress area and reduce the probability of occurrence of ground pressure impact in the partial area of the second roadway contained in the high-stress area.
2. The method of claim 1, wherein drilling a borehole into a deep portion of the near-vertical coal seam of the high stress zone comprises:
and drilling multiple rows of drilling holes in sequence towards the deep part of the nearly vertical coal seam of the high-stress area along a first direction, wherein the first direction is the mining direction of the mining area, the distribution direction of the drilling holes in each row of drilling holes is parallel to a second direction, and the second direction is perpendicular to the first direction.
3. The method of claim 2, wherein sequentially drilling a plurality of rows of boreholes into a deep portion of the near vertical coal seam of the high stress zone in a first direction comprises:
in the process of drilling each row of drilling holes, a first drilling hole, a second drilling hole and a third drilling hole are sequentially drilled along the second direction, the depth of the first drilling hole, the depth of the second drilling hole and the depth of the third drilling hole are all located in a first preset depth range, the diameter of the first drilling hole, the diameter of the second drilling hole and the diameter of the third drilling hole are all located in a first preset diameter range, an included angle between the first drilling hole and the first direction is a first preset angle, an included angle between the second drilling hole and the first direction is a second preset angle, an included angle between the third drilling hole and the first direction is a third preset angle, and the first preset angle is smaller than the second preset angle and smaller than the third preset angle.
4. The method of claim 1, wherein drilling a borehole into both a deep portion of a top plate of the high stress region and a deep portion of a bottom plate of the high stress region comprises:
and drilling multiple rows of drilling holes towards the deep part of the top plate of the high-stress area and the deep part of the bottom plate of the high-stress area along a first direction, wherein the first direction is the mining direction of the mining area, the distribution direction of the drilling holes in each row of drilling holes is parallel to a second direction, and the second direction is perpendicular to the first direction.
5. The method of claim 4, wherein drilling multiple rows of holes into the deep portion of the top plate of the high stress region and the deep portion of the bottom plate of the high stress region in the first direction comprises:
in the process of drilling each row of drilling holes, at least a fourth drilling hole and a fifth drilling hole are drilled in sequence along the second direction, the depth of the fourth drilling hole and the depth of the fifth drilling hole are both in a second preset depth range, the diameter of the fourth drilling hole and the diameter of the fifth drilling hole are both first preset diameters, an included angle between the fourth drilling hole and the first direction is a fourth preset angle, an included angle between the fifth drilling hole and the first direction is a fifth preset angle, and the fifth preset angle is larger than the fourth preset angle.
6. The method of claim 5, wherein sequentially drilling at least a fourth borehole and a fifth borehole in the second direction comprises:
and sequentially drilling the fourth drilling hole, the fifth drilling hole, the sixth drilling hole and the seventh drilling hole along the second direction, wherein the depth of the sixth drilling hole and the depth of the seventh drilling hole are both the first preset depth, the diameter of the sixth drilling hole and the diameter of the seventh drilling hole are both the first preset diameter, the included angle between the sixth drilling hole and the first direction is a sixth preset angle, the included angle between the seventh drilling hole and the first direction is a seventh preset angle, the first preset depth is larger than the upper limit value of the second preset depth range, the seventh preset angle is larger than the sixth preset angle, and the seventh preset angle is smaller than the fourth preset angle.
7. The method of any one of claims 1 to 6, comprising, after obtaining stress concentration coefficients for a plurality of location points of the mining area:
determining a low stress zone according to the stress concentration coefficients of the position points of the mining zone, wherein the low stress zone comprises a partial region of the nearly vertical coal seam, a partial region of the first roadway and a partial region of the second roadway, and the stress concentration coefficients of a plurality of the position points in the low stress zone are smaller than or equal to preset stress concentration coefficients;
drilling holes into the deep part of the top plate of the low stress area and the deep part of the bottom plate of the low stress area, and blasting the holes of the top plate of the low stress area and the holes of the bottom plate of the low stress area.
8. The method of claim 7, wherein drilling a borehole into both a deep portion of the top plate of the low stress region and a deep portion of the bottom plate of the low stress region comprises:
and drilling multiple rows of drilling holes towards the deep part of the top plate of the low-stress area and the deep part of the bottom plate of the low-stress area along a first direction, wherein the first direction is the mining direction of the mining area, the distribution direction of the drilling holes in each row of drilling holes is parallel to a second direction, and the second direction is perpendicular to the first direction.
9. The method of claim 8, wherein drilling multiple rows of holes into a deep portion of the top plate of the low stress region and a deep portion of the bottom plate of the low stress region in a first direction, comprises:
in the process of drilling each row of drilling holes, at least an eighth drilling hole and a ninth drilling hole are drilled in sequence along the second direction, the depth of the eighth drilling hole and the depth of the ninth drilling hole are in a third preset depth range, the diameter of the eighth drilling hole and the diameter of the ninth drilling hole are both second preset diameters, an included angle between the eighth drilling hole and the first direction is an eighth preset angle, an included angle between the ninth drilling hole and the first direction is a ninth preset angle, and the ninth preset angle is larger than the eighth preset angle.
10. The method of claim 9, wherein during drilling each row of holes, at least an eighth hole, a ninth hole, are drilled sequentially in the second direction, comprising:
along the second direction, drill in proper order eighth drilling, ninth drilling, tenth drilling, eleventh drilling, the degree of depth of tenth drilling with the degree of depth of eleventh drilling is the second and presets the degree of depth, the diameter of tenth drilling with the diameter of eleventh drilling is the second presets the diameter, the angle of tenth drilling with the first direction is tenth presets the angle, the angle of eleventh drilling with the first direction is eleventh presets the angle, the second presets the degree of depth and is greater than the third presets the upper limit value of degree of depth scope, eleventh presets the angle and is greater than tenth presets the angle, eleventh presets the angle and is less than eighth presets the angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311442294.9A CN117248908A (en) | 2023-10-31 | 2023-10-31 | Near-vertical coal seam ground pressure impact control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311442294.9A CN117248908A (en) | 2023-10-31 | 2023-10-31 | Near-vertical coal seam ground pressure impact control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117248908A true CN117248908A (en) | 2023-12-19 |
Family
ID=89129615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311442294.9A Pending CN117248908A (en) | 2023-10-31 | 2023-10-31 | Near-vertical coal seam ground pressure impact control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117248908A (en) |
-
2023
- 2023-10-31 CN CN202311442294.9A patent/CN117248908A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10472963B2 (en) | Method for stepwise construction of preferential gas migration pathway at stope in coal seam | |
| CN108661643B (en) | It a kind of coal working face end adopts return channel and cuts top release shield lane method | |
| CN110374600B (en) | Non-offset arrangement method for mining roadway of extremely-close coal seam group | |
| CN106121648B (en) | Sublevel open stoping chassis route ore drawing subsequent filling mining method | |
| AU2021106168A4 (en) | High-gas Coal Seam Group Pressure Relief Mining Method Based on Gob-side Entry Retaining in the First Mining Whole Rock Pressure Relief Working Face | |
| CN112282806B (en) | Thick coal seam forced mining roadway blasting pressure relief and long anchor rod cooperative roof control method | |
| CN111140279B (en) | Method for preventing and treating old empty water on thick coal seam under condition of repeated mining caused by small kiln damage to layering | |
| CN104453899A (en) | Safety recovery method of island working surface under complicated condition | |
| CN110984989B (en) | Mining method of steeply inclined medium-thickness ore body | |
| CN102587915A (en) | Induction caving mining method under artificial false roof | |
| CN113739655B (en) | Pre-splitting blasting method for roof of rock burst mine temporary empty roadway | |
| CN110145311A (en) | Thick or thick phosphorus ore body underground mining method in a kind of low-angle dip | |
| CN111255453A (en) | Method for reducing ground surface subsidence range of underground mining area | |
| CN105865281A (en) | Method for transverse open excavation controlled blasting construction adjacent to power station and booster station | |
| CN110778317A (en) | Construction method for ground grouting filling drilling structure in caving zone in mining process | |
| CN117248908A (en) | Near-vertical coal seam ground pressure impact control method | |
| CN112727459B (en) | Mining method for reducing mining influence of shallow coal seam | |
| CN111022050B (en) | Fully-closed blasting pressure relief and self-retained roadway method for grouting reconstruction of composite roof | |
| CN209857781U (en) | Mine blasting big gun hole structure | |
| CN112861068A (en) | Method for determining mining overburden rock damage height | |
| US6527345B2 (en) | Method for excavating a tunnel rock face by drilling a pattern of lifter and line holes | |
| CN106703809A (en) | Method for forming cover layer through induced falling of open-pit-to-underground multi-branched orebody | |
| CN114165268B (en) | Grading coordination strengthening method for coal roadway tunneling broken surrounding rock | |
| CN111749693B (en) | Method for constructing and blocking deep hole in large fault section by sill pillar-free sublevel caving method | |
| CN116163798A (en) | Overlying strata separation grouting method for goaf lower long wall working face mining |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |