CN112727461B - Gob-side roadway mining stress superposition control method - Google Patents
Gob-side roadway mining stress superposition control method Download PDFInfo
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- CN112727461B CN112727461B CN202110004310.0A CN202110004310A CN112727461B CN 112727461 B CN112727461 B CN 112727461B CN 202110004310 A CN202110004310 A CN 202110004310A CN 112727461 B CN112727461 B CN 112727461B
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- 238000005065 mining Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000003245 coal Substances 0.000 claims abstract description 50
- 238000005553 drilling Methods 0.000 claims abstract description 48
- 239000011435 rock Substances 0.000 claims abstract description 18
- 238000010276 construction Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000011084 recovery Methods 0.000 claims description 2
- 230000009471 action Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 238000009423 ventilation Methods 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
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Excavating Of Shafts Or Tunnels (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention provides a gob-side roadway mining stress superposition control method, which comprises the following steps: drilling a hole on the top plate of the overlying rock stratum from one side, close to the section coal pillar, above the gob-side entry to the side of the coal pillar above the section coal pillar during construction; and constructing coal pillar side top plate fracturing of the overburden rock top plate along the coal pillar side drilling. The gob-side roadway mining stress superposition control method can cut off the overburden top plate of the gob-side roadway mining working face in advance, control the fracture position of the overburden top plate of the gob-side roadway mining working face, and enable the fracture position of the overburden top plate of the gob-side roadway mining working face to move outwards to the area above the gob-side roadway top plate in the mining process, so that the advanced mining stress generated by unstable fracture motion of the overburden top plate is not acted on the section coal pillars any more, and the gob-side roadway surrounding rock is not subjected to mining stress disturbance with higher strength any more in the mining process of the gob-side roadway mining working face, so that the stress of the gob-side roadway surrounding rock is ensured to be stable and stable, and the efficient, rapid and safe mining of the gob-side roadway is realized.
Description
Technical Field
The invention relates to the technical field of mineral resource development, in particular to a gob-side roadway mining stress superposition control method.
Background
The gob-side roadway refers to a roadway arranged along the edge of a goaf, and the roadway can be a gob-side tunneling roadway in a narrow (wide) coal pillar protecting mode or a gob-side entry retaining roadway in a narrow (wide) coal pillar protecting mode. In the process of stoping the stope face of the gob-side roadway, the mutual superposition of the advance stope stress of the stope face and the stope stress formed by the stope face is inevitably suffered, and the surrounding rock of the gob-side roadway in the advance range of the stope face shows extremely violent and large deformation and damage characteristics. Obviously, mutual coupling and superposition of the advanced mining stress caused by the stoping of the stoping working face of the gob-side roadway and the mining stress formed by the stoped working face are the root cause of large deformation and damage of the gob-side roadway. The deformation and damage range of the gob-side roadway is large, the advance support range exceeds hundreds of meters, the forepart of the roadway is often overthrown, and the stope and the maintenance are required, so that the underground operation environment is severe, and the safe and rapid mining of the stope face is severely restricted. In order to manage the damage disasters of the severe deformation of the advanced range of the gob-side roadway, the advanced maintenance length of the gob-side roadway is usually reinforced and lengthened in a coal mine, and if the fracture surface of the roadway is damaged and contracted to be incapable of meeting the ventilation requirements of pedestrians, heavy roadway repair work such as top raising, side expanding, bottom raising and the like has to be adopted.
Disclosure of Invention
The invention provides a gob-side roadway mining stress superposition control method, which is used for solving the problems that in the prior art, gob-side roadway mining stress superposition is easy to damage and inconvenient to maintain after damage.
The invention provides a gob-side roadway mining stress superposition control method, which comprises the following steps:
drilling a hole on the top plate of the overlying strata from one side, close to the section coal pillar, above the gob-side entry to the side of the coal pillar above the section coal pillar;
and constructing coal pillar side top plate fracturing of the overlying rock layer top plate along the coal pillar side drilling hole.
According to the gob-side roadway mining stress superposition control method provided by the invention, the gob-side roadway mining stress superposition control method further comprises the following steps:
constructing a working face side drilling hole of an overlying rock stratum top plate from a gob-side roadway to the stoping working face side, wherein the working face side drilling hole is distributed along the advancing direction of the stoping working face;
and carrying out top plate fracturing on the recovery working face side of the overburden top plate along the drilling construction on the working face side.
According to the mining stress superposition control method for the gob-side roadway, provided by the invention, the projection of the drilling hole on the working face side on the horizontal plane is vertical to the advancing direction of the stope face.
According to the gob-side roadway mining stress superposition control method provided by the invention, the drill holes on the working face side are uniformly distributed in the advancing direction of the stope face, the distance between the adjacent drill holes on the working face side is A, and A is more than or equal to 10m and less than or equal to 15m.
According to the gob-side roadway mining stress superposition control method provided by the invention, an included angle a between the drilling hole on the working face side and a horizontal plane is 45 degrees, the hole length of the drilling hole on the working face side is B, and B is more than or equal to 40m and less than or equal to 60m.
According to the mining stress superposition control method for the gob-side roadway, provided by the invention, the construction process of the coal pillar side drilling hole comprises the following steps:
vertical construction drilling is carried out on the gob-side roadway to form a vertical drilling section;
and constructing a horizontal drilling section from the top end of the vertical drilling section to one side of the goaf.
According to the gob-side roadway mining stress superposition control method provided by the invention, the included angle formed by the horizontal drilling section and the advancing direction of the stope face is b, and the included angle b is greater than or equal to 0 degree and less than or equal to 10 degrees.
According to the gob-side roadway mining stress superposition control method provided by the invention, the distance from the vertical drilling section to the section coal pillar is C, and C is more than or equal to 0.8m and less than or equal to 1m.
According to the mining stress superposition control method for the gob-side entry provided by the invention, the coal pillar side drill holes are uniformly distributed along the advancing direction of the stope face.
According to the gob-side roadway mining stress superposition control method provided by the invention, the distance between the side drilling holes of adjacent coal pillars is D, and D is more than or equal to 8m and less than or equal to 12m. According to the gob-side roadway mining stress superposition control method provided by the invention, the distance between the side drilling holes of adjacent coal pillars is D, D is more than or equal to 8m and less than or equal to 12m, the vertical construction drilling depth is H, and H is more than or equal to 30m and less than or equal to 40m. .
According to the gob-side roadway mining stress superposition control method, through coal pillar side drilling and coal pillar side roof fracturing construction, the overburden roof of the gob-side roadway mining face can be cut off in advance, the fracture position of the overburden roof of the gob-side roadway mining face is controlled, the fracture position of the overburden roof of the gob-side roadway mining face is made to move outwards to the area above the gob-side roadway roof in the mining process of the gob-side roadway mining face, and the advanced mining stress generated by unstable fracture motion of the overburden roof is guaranteed not to act on the section coal pillars any more. The surrounding rocks of the gob-side roadway are ensured not to be subjected to the disturbance action of mining stress with higher strength in the mining process of the stope face of the gob-side roadway, so that the surrounding rocks of the gob-side roadway are ensured to be stably and stably stressed, and the stope face is efficiently, quickly and safely mined.
In addition, through drilling on the construction working face side and fracturing of a top plate on the stope working face side, the caving length of the top plate of the overlying strata in the advancing direction of the working face is controlled, the pressure step length is controlled periodically to effectively weaken the pressure of the advanced bearing, further weaken the pressure applied to surrounding rocks of the gob-side roadway, and achieve the purpose of treating the disasters of violent large deformation and damage of the gob-side roadway in the advanced range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a stratigraphic structure and stress profile of a goaf with lateral mining stresses acting on the overburden roof;
FIG. 2 is a stratum structure and a stress distribution diagram formed by the action of the mining advance range mining dynamic stress of a stope face and the lateral mining dynamic stress of a goaf on a roof of an overlying rock layer when the gob-side roadway mining dynamic stress superposition control method provided by the invention is not adopted;
FIG. 3 is a stratum structure and a stress distribution diagram mined by a stope face when the gob-side roadway mining stress superposition control method provided by the invention is adopted;
fig. 4 is a plan view of the arrangement of the drill holes in the method for controlling the superposition of mining stress along a gob-side entry provided by the present invention (the arrow in the figure indicates the advancing direction of the stope face of the gob-side entry);
fig. 5 is a cross section of the arrangement of the drill holes in the gob-side entry mining stress superposition control method provided by the invention.
Reference numerals:
1. sectional coal pillars; 2. A gob; 3. An overburden roof;
4. a gob-side roadway; 5. Drilling holes on the side of the coal pillar; 51. A vertical drilling section;
52. a horizontal drilling section; 6. Drilling on the working face side; 7. And (5) stoping the working face.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, a first feature may be "on" or "under" a second feature such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediary. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
The method for controlling the mining stress superposition of the gob-side roadway 4 is used for solving the problems that the mining stress superposition of the gob-side roadway 4 is easy to damage and inconvenient to maintain after damage in the prior art. As can be seen from fig. 1, when the gob-side entry 4 mining stress superposition control method according to the embodiment of the present invention is not used: and (3) adopting a roadway-protecting coal pillar mining mode, forming an overlying strata roof 3 structure and stress distribution along the inclined arrangement direction of the mined working face as shown in figure 1 after the mined working face is mined, and positioning a gob-side roadway 4 arranged close to the goaf 2 in a high mining dynamic stress accumulation area formed by the mined working face. As shown in fig. 2, when the mining advance range mining stress of the stope face 7 of the gob-side roadway 4 and the lateral mining stress generated by the mined face are mutually coupled and superposed to form a double mining stress with a higher concentration degree, a stronger large deformation damage disaster is caused to the surrounding rock in the advance range of the gob-side roadway 4.
The following describes, with reference to fig. 3 to fig. 5, a method for controlling superposition of mining stress along a gob-side entry 4 according to an embodiment of the present invention, including:
an overlying strata top plate is drilled from one side of the gob-side entry 4 close to the section coal pillar 1 to the coal pillar side 5 above the section coal pillar 1 during construction;
and constructing coal pillar side top plate fracturing of the overburden stratum top plate 3 along the coal pillar side drilling hole 5.
The method can adopt blasting presplitting or hydraulic fracturing method when carrying out coal pillar side roof fracturing, after coal pillar side roof fracturing construction is accomplished, can cut off gob entry 4 stoping working face 7 overlying strata roof 3 in advance to the fracture position of overlying strata roof 3 of the stoping working face 7 of gob entry 4 is controlled, impels gob entry 4 stoping working face 7 exploitation in-process overlying strata roof 3 fracture position to move to gob entry 4 roof top region outward. Ensuring that the advanced mining stress generated by the unstable fracture motion of the overburden top plate 3 is not applied to the section coal pillar 1 any more.
Further, the construction process of the coal pillar side-drilled hole 5 includes:
drilling vertically from the gob side entry 4 to form a vertical drilling section 51;
and constructing a horizontal drilling section 52 from the top end of the vertical drilling section 51 to one side of the goaf 2.
Wherein the horizontal drilling section 52 does not extend perpendicular to the advancing direction of the stope face 7, but forms an angle b smaller than 90 degrees with the advancing direction of the stope face 7, and the angle b between the horizontal drilling section 52 and the advancing direction of the stope face 7 is preferably 0-10 degrees, so as to ensure that a complete fissure zone is formed in the advancing direction of the stope face 7, and a good pressure blocking effect is achieved. The distance from the vertical drilling hole to the coal pillar 1 of the section is C, C is more than or equal to 0.8m and less than or equal to 1m, enough construction space is reserved, and meanwhile, a good blocking effect is guaranteed.
The coal pillar side drill holes 5 are uniformly distributed along the advancing direction of the stope face 7, so that the fracturing conditions of all parts of the overburden layer top plate 3 on the coal pillar side are uniform in the advancing direction of the stope face 7.
Furthermore, the distance between the side drill holes 5 of the adjacent coal pillars is D, D is more than or equal to 8m and less than or equal to 12m, the depth of the vertical drill hole section 51 is H, and H is more than or equal to 30m and less than or equal to 40m. And the drilling and fracturing times are reduced under the condition of meeting the pressure relief requirement of the overburden top plate 3 on the side of the coal pillar, so that the labor cost and the time cost are saved.
In another embodiment of the present invention, the method for controlling the mining stress superposition of the gob-side entry 4 further includes:
working face side drill holes 6 covering a rock stratum top plate are constructed from the gob-side roadway 4 to the stope working face 7 side, and the working face side drill holes 6 are distributed along the advancing direction of the stope working face 7;
and (4) constructing roof fracturing on the stope face 7 side of the overburden roof 3 along the working face side drill hole 6.
The top plate on the side of the stope face 7 can also be fractured by adopting an explosion pre-fracturing or hydraulic fracturing method. By fracturing the construction face-side borehole 6 and the extraction face 7-side roof, the overburden roof 3 on the extraction face 7 side can be divided into a plurality of stages in the direction in which the extraction face 7 advances. The distance between two adjacent working face side drill holes 6 is the single caving length of the overburden top plate 3 when the stope face 7 is pushed. The caving length of the overburden roof 3 in the advancing direction of the stope face 7 is cut off in advance, the pressure step length is controlled periodically by the stope face 7, the pressure of the advanced bearing is effectively weakened, and the pressure applied to surrounding rocks of the gob-side roadway 4 is further weakened.
Further, the projection of the working face side borehole 6 on the horizontal plane is perpendicular to the advancing direction of the stope face 7, so as to better cut off the collapse length of the overburden top plate 3 when the stope face 7 advances.
The working face side drill holes 6 are uniformly distributed in the pushing direction of the stope working face 7, so that the caving length of each section of the overburden top plate 3 is equal, the preferred distance between the adjacent working face side drill holes 6 is A, A is more than or equal to 10m and less than or equal to 15m, the caving length of each section is controlled within the range of 10-15m, and the construction safety when the stope working face 7 is pushed is ensured.
Optionally, the included angle between the working face side drill hole 6 and the horizontal plane is 45 degrees, the hole length of the working face side drill hole 6 is B, and B is more than or equal to 40m and less than or equal to 60m.
It can be known from a combination of fig. 5 that two technical means of coal pillar side drilling 5, coal pillar side roof fracturing and working face side drilling 6, stope face 7 side roof fracturing are combined together, so that the mining stress of the goaf 2 and the stope face 7 side can be prevented from being mutually coupled and superposed on the section coal pillar 1, and the surrounding rock of the gob-side tunnel 4 is ensured not to be subjected to the mining stress disturbance action with higher strength in the mining process of the stope face 7 of the gob-side tunnel 4, thereby ensuring the stress stability and stability of the surrounding rock of the gob-side tunnel 4, and realizing the efficient, rapid and safe mining of the stope face 7.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A gob-side roadway mining stress superposition control method is characterized by comprising the following steps:
drilling a hole on the top plate of the overlying strata from one side, close to the section coal pillar, above the gob-side entry to the side of the coal pillar above the section coal pillar;
constructing coal pillar side top plate fracturing of the overlying rock layer top plate along the coal pillar side drilling;
the construction process of the coal pillar side drilling hole comprises the following steps:
vertical construction drilling is carried out on the gob-side roadway to form a vertical drilling section;
constructing a horizontal drilling section from the top end of the vertical drilling section to one side of the goaf;
the horizontal drilling section and the advancing direction of the stope face form an included angle b, wherein b is more than or equal to 0 degree and less than or equal to 10 degrees;
the distance from the vertical drilling section to the section coal pillar is C, and C is more than or equal to 0.8m and less than or equal to 1m.
2. The gob-side entry mining stress superposition control method according to claim 1, characterized by further comprising:
constructing a working face side drill hole of an overlying rock stratum top plate from a gob-side entry to the stoping working face side, wherein the working face side drill hole is arranged along the advancing direction of the stoping working face;
and carrying out top plate fracturing on the recovery working face side of the overburden top plate along the drilling construction on the working face side.
3. The gob-side entry mining stress superposition control method according to claim 2, wherein a projection of the face-side borehole on a horizontal plane is perpendicular to a stope face advancing direction.
4. The gob-side entry mining stress superposition control method according to claim 2, wherein the working face side drill holes are uniformly distributed in the advancing direction of the stope face, the distance between adjacent working face side drill holes is A, and A is greater than or equal to 10m and less than or equal to 15m.
5. The gob-side entry mining stress superposition control method according to any one of claims 2 to 4, characterized in that an angle a between the working face-side drilled hole and a horizontal plane is 45 °, a hole length of the working face-side drilled hole is B, and B is greater than or equal to 40m and less than or equal to 60m.
6. The gob-side entry mining stress superposition control method according to claim 1, wherein the coal pillar side drill holes are uniformly distributed in a direction of advancement of a stope face.
7. The gob-side entry mining stress superposition control method according to claim 1, characterized in that the distance between adjacent pillar side boreholes is D, D is greater than or equal to 8m and less than or equal to 12m; the depth of the vertical drilling section is H, and H is more than or equal to 30m and less than or equal to 40m.
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| CN202110004310.0A CN112727461B (en) | 2021-01-04 | 2021-01-04 | Gob-side roadway mining stress superposition control method |
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| CN113266355B (en) * | 2021-05-31 | 2024-06-18 | 中煤科工开采研究院有限公司 | Gob-side entry driving method |
| CN113338925B (en) * | 2021-06-30 | 2022-07-15 | 中国矿业大学 | Anti-dynamic-load pressure rack method for fracturing coal pillar source in multi-coal-seam mining roadway |
| CN113958321A (en) * | 2021-10-26 | 2022-01-21 | 中煤科工开采研究院有限公司 | Method for retaining roadway along empty retaining wall |
| CN114215530B (en) * | 2021-11-29 | 2024-04-19 | 中国矿业大学 | Rapid roadway digging method for directional hydraulic fracturing gob-side roadway of hard top plate |
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| CN101509395B (en) * | 2009-03-16 | 2011-11-09 | 太原理工大学 | The roof caving and tunnel protecting method |
| CN103216264B (en) * | 2013-04-24 | 2015-04-22 | 安徽理工大学 | Method for controlling deformation of surrounding rock of basic rimrock layer on presplitting blasting mining roadway |
| CN103321642B (en) * | 2013-05-06 | 2015-03-11 | 中国矿业大学 | Gob-side entry retaining surrounding rock stabilizing method based on lateral rock stratum pre-splitting control |
| CN103758570A (en) * | 2014-01-14 | 2014-04-30 | 中国矿业大学 | Method for controlling high mine pressure of open-air roadway by hydraulic fracturing |
| CN106761742B (en) * | 2016-11-23 | 2019-04-16 | 西安科技大学 | A kind of deep island working face gob side entry driving surrounding rock stability control method |
| CN107701188B (en) * | 2017-10-25 | 2019-02-26 | 太原理工大学 | One kind cutting top destressing method for the mined out side static state spalling of gob side entry driving thin coal pillar |
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