CN111894587A - Method for improving recovery rate of coal pillars on double-lane driving working face and stability of lanes - Google Patents
Method for improving recovery rate of coal pillars on double-lane driving working face and stability of lanes Download PDFInfo
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- CN111894587A CN111894587A CN202010796282.6A CN202010796282A CN111894587A CN 111894587 A CN111894587 A CN 111894587A CN 202010796282 A CN202010796282 A CN 202010796282A CN 111894587 A CN111894587 A CN 111894587A
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- 238000011084 recovery Methods 0.000 title claims abstract description 43
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- 238000005065 mining Methods 0.000 claims description 10
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Abstract
The embodiment of the invention provides a method for improving the recovery rate of coal pillars on a double-roadway driving working face and the stability of a roadway, which comprises the following steps: respectively fracturing a roof above two inclined sides of a first roadway, which are adjacent to a first stope face and a first coal pillar; stoping the first stoping face until the stoping is empty; excavating a second roadway in the first coal pillar, wherein the second roadway divides the first coal pillar into a first reserved coal pillar and a first recoverable coal pillar; and stoping the first recoverable coal pillar and the second stoping face. The method for improving the recovery rate of the coal pillars of the double-lane driving working face and the stability of the lane provided by the embodiment of the invention not only can greatly improve the recovery rate of the coal pillars between the double lanes in the use process, but also can crack the advanced support section of the lane and the side high roof of the coal pillars on the premise of safety and explosion prevention, so that the supporting pressure caused by the stope face stope is greatly reduced, and the problem that the coal pillars between the double lanes cannot be recovered and the surrounding rock stability of the double lanes cannot be ensured in the traditional stope working and support mode is solved by the technology.
Description
Technical Field
The invention relates to the technical field of roadway excavation, in particular to a method for improving the recovery rate of coal pillars on a double-roadway excavation working face and the stability of a roadway.
Background
The mining design of the coal resources comprises coal resource division, wherein the coal resource division generally comprises the steps of firstly determining the level of a large transportation roadway or a total air return roadway along a certain elevation of a coal seam, then dividing the two levels into stages, and finally dividing mining sections between the stages in an inclined direction.
The roadway and the stope face can be arranged in the zone, and the double-roadway arrangement in the zone can be understood as that two stope roadways are respectively dug at the left and the right of the stope face, and are respectively responsible for the functions of feeding, ventilation, transportation, pedestrians and the like. As shown in fig. 1, a roadway 11 is formed beside the first stope face 1, coal pillars 12 are arranged on the other side of the roadway 11, the roadway 11 is formed beside the coal pillars 12, and a second stope face 2, the roadway 11, the coal pillars 12 and the like are sequentially arranged behind the roadway 11.
Two roadways are excavated at the same time, and one roadway is advanced, so that the method has the advantages that: firstly, tunneling and ventilation are easy; secondly, two outlets are arranged on the entry and exit driving face, and disaster avoidance outlets are arranged for stoping; the coal seam change can be explored in advance, and the orientation of the other delayed tunneling roadway is facilitated; fourthly, the water is convenient to drain; easily feeding the materials to a roadway; and creating conditions for timely upper and lower mining surface succession. Due to the advantages, the double-lane arrangement can be widely applied, especially in high-gas high-outburst mines.
In order to maintain the stability of the surrounding rock of the roadway, the coal mine roadway usually supports the surrounding rock of the roadway by matching an anchor rod and an anchor rope, so that the surrounding rock can be reinforced, the stability of the surrounding rock can be improved, the roof can be prevented from sinking and falling, and the method is popularized in the control of the surrounding rock of the roadway due to obvious effect. However, with the stope face stoping, it is inevitable to form bearing pressure zones ahead and behind the face. As shown in fig. 2, after the first stope face 1 is mined out, a support pressure zone 13 is formed in front of the first stope face gob 14, and a support pressure zone 13 is also formed in the coal pillar 12.
Some outstanding problems arise due to the defects left in the section coal pillars and the presence of bearing pressure, the most significant of which are two problems: firstly, the adjacent roadway 11 is affected by mining, large deformation is easy to occur, and the maintenance time is long and difficult; secondly, the size of the coal pillar 12 is mostly between 20 m and 30m, the coal pillar 12 is often not recycled in production, even if part of the coal pillar is difficult to recycle, and the waste of coal resources is serious.
The important reason that the stability of the roadway cannot be guaranteed is that the high supporting pressure caused by the stope face stope cannot be reduced, the coal pillar cannot be recovered except for the space design reason, and the other important reason is that the deformation and the damage are serious due to the influence of the high supporting pressure, so that the problems of the coal pillar recovery rate and the roadway stability of the double-roadway driving face are very urgently needed to be effectively solved.
Disclosure of Invention
The embodiment of the invention provides a method for improving the recovery rate of coal pillars and the stability of a roadway of a double-roadway driving face, which is used for solving the defects that the roadway is unstable and the coal pillars cannot be recovered in the prior art, improving the stability of the roadway and recovering part of the coal pillars.
The embodiment of the invention provides a method for improving the recovery rate of coal pillars on a double-roadway driving working face and the stability of a roadway, which comprises the following steps: respectively fracturing a roof above two inclined sides of a first roadway, which are adjacent to a first stope face and a first coal pillar; stoping the first stoping face until the stoping is empty; excavating a second roadway in the first coal pillar, wherein the second roadway divides the first coal pillar into a first reserved coal pillar and a first recoverable coal pillar; and stoping the first recoverable coal pillar and the second stoping face.
According to the method for improving the coal pillar recovery rate and the roadway stability of the double-roadway driving face, before the step of recovering the first recoverable coal pillar and the second recoverable coal pillar, the method further comprises the following steps of: and fracturing the top plate above the two inclined sides of the third roadway, which are adjacent to the second stope face and the second coal pillar, respectively.
According to the method for improving the coal pillar recovery rate and the roadway stability of the double-roadway driving face, after the step of recovering the first recoverable coal pillar and the second recoverable coal pillar, the method further comprises the following steps: and emptying the second stope face.
According to the method for improving the recovery rate of the coal pillars on the double-roadway driving face and the roadway stability, disclosed by the embodiment of the invention, the method further comprises the following steps: and excavating a fourth roadway in the second coal pillar, wherein the fourth roadway divides the second coal pillar into a second reserved coal pillar and a second recoverable coal pillar.
According to the method for improving the recovery rate of the coal pillars on the double-roadway driving face and the roadway stability, disclosed by the embodiment of the invention, the method further comprises the following steps: and (4) stoping the second recoverable coal pillar, stoping a third stoping face, and repeating in sequence to stope all the recoverable coal pillars.
According to the method for improving the recovery rate of the coal pillars of the double-roadway driving working face and the stability of the roadway, the step of fracturing the top plate above two inclined sides of the first roadway, which is adjacent to the first stope and the first coal pillars, further comprises the following steps: and respectively arranging roof pressure relief holes on the roof above the two inclined sides adjacent to the first stope face and the first coal pillar in the first roadway.
According to the method for improving the recovery rate of the coal pillars on the double-roadway driving face and the roadway stability, disclosed by the embodiment of the invention, the method further comprises the following steps: and impacting the top plate pressure relief holes by using high-pressure water fracturing equipment to fracture the top plate.
According to the method for improving the coal pillar recovery rate and the roadway stability of the double-roadway driving face, the step of stoping the first stoping face till the stoping is empty further comprises the following steps: and mining the first stope face to form a first stope face goaf.
According to the method for improving the recovery rate of the coal pillars and the stability of the roadway of the double-roadway driving face, the step of excavating the second roadway in the first coal pillar further comprises the following steps: and excavating the second roadway in the first coal pillar along the edge of the goaf of the first stope face.
The method for improving the recovery rate of the coal pillars on the double-lane driving working face and the stability of the lane provided by the embodiment of the invention not only can greatly improve the recovery rate of the coal pillars between the double lanes in the using process, but also can crack the advanced support section of the lane and the side high roof of the coal pillars on the premise of safety and explosion prevention, so that the supporting pressure caused by the extraction of the mining working face is greatly reduced, and the stability of surrounding rocks of the double lanes can be effectively ensured. The technology overcomes the difficult problems that the coal pillars between the double roadways cannot be recovered and the stability of surrounding rocks of the double roadways cannot be ensured in the traditional stoping work and supporting mode. The method for improving the coal pillar recovery rate and the roadway stability of the double-roadway driving face provided by the embodiment of the invention has the advantages of reasonable space-time collocation of each part, feasible technology, convenient construction, safety and high efficiency, and is convenient to apply to underground construction.
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 description of the embodiments or 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 those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic view of the spatial position of a dual roadway driving face in the prior art;
FIG. 2 is a schematic illustration of a prior art dual roadway layout stope face bearing pressure distribution;
fig. 3 is a flowchart of a method for improving coal pillar recovery rate and roadway stability of a double-roadway driving face according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a top plate relief hole arrangement;
fig. 5 is a schematic space view of the overall arrangement of roadway driving;
fig. 6 is a schematic position diagram of a roadway and a recoverable coal pillar.
Reference numerals:
1: a first stope face; 2: a second stope face; 3: a first roadway; 4: a first coal pillar; 5: a third roadway; 6: a second coal pillar; 11: a roadway; 12: a coal pillar; 13: a support pressure zone; 14: a first stope face gob; 21: a roof pressure relief vent; 41: firstly, coal pillars are reserved: 42: a second roadway; 43: a first recoverable coal pillar; 01. 02, 03, 04: and (4) carrying out the steps.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for improving the coal pillar recovery rate and the roadway stability of the double-roadway driving face according to the embodiment of the invention is described below with reference to fig. 1 to 6.
The double-roadway excavation means that two stoping roadways are excavated on the left and the right of a stoping face respectively, and the two stoping roadways are respectively used for the functions of feeding, ventilation, transportation, pedestrians and the like. As shown in fig. 1, roadways 11 are arranged on the left and right sides of the second stope face 2, a roadway 11 is arranged on one side of the first stope face 1, and a coal pillar 12 is arranged between the two roadways 11. The two roadways 11 are excavated at the same time, and one roadway 11 is advanced, so that the method has the advantages that: firstly, tunneling and ventilation are easy; secondly, two outlets are arranged on the entry and exit driving face, and disaster avoidance outlets are arranged for stoping; the coal seam change can be explored in advance, and the orientation of the other delayed tunneling roadway is facilitated; fourthly, the water is convenient to drain; easily feeding the materials to a roadway; and creating conditions for timely upper and lower mining surface succession. .
However, when the first stope face 1 is stoped, a support pressure zone 13 is formed in front of the first stope face gob 14 after the first stope face 1 is mined out, and a support pressure zone 13 is also formed in the coal pillar 12, as shown in fig. 2. The supporting pressure can cause the adjacent roadway 11 to be affected by mining, large deformation is easy to occur, the maintenance time is long and difficult, and meanwhile, the coal pillars 12 are seriously damaged due to deformation and cannot be recycled.
As shown in fig. 3 to 6, the method for improving the recovery rate of the coal pillars and the stability of the roadway of the double-roadway driving face according to the embodiment of the present invention includes the following steps:
01: and (3) respectively fracturing the top plates of two obliquely-upper sides of the first roadway 3, which are adjacent to the first stope face 1 and the first coal pillar 4. Specifically, roof pressure relief holes 21 are formed in the roof obliquely above two sides adjacent to the first stope face 1 and the first coal pillar 4 in the first roadway 3, high-pressure water fracturing equipment is used for impacting the roof pressure relief holes 21, the roof is fractured in sections under the impact action of high-pressure water, roof pressure relief crack zones are formed in the roof adjacent to the first stope face 1 and the first coal pillar 4 in the first roadway 3, the pressure relief crack zones can reduce high bearing pressure caused by stope of the first stope face 1, stress deformation of the first coal pillar 4 is reduced, and accordingly protection is formed on the first roadway 3 and the roadway 11 adjacent to the first coal pillar 4.
02: and stoping the first stoping face 1 until the stoping is empty. Specifically, after a roof pressure relief fracturing zone is formed in the roof of the first roadway 3, the first stope face 1 is stoped, and after stoping is completed, a first stope face gob 14 is formed.
03: and excavating a second roadway 42 in the first coal pillar 4, wherein the second roadway 42 divides the first coal pillar 4 into a first reserved coal pillar 41 and a first recoverable coal pillar 43. Specifically, the position of the second roadway 42 is selected within the pressure relief protection range of the first roadway 3, the second roadway 42 is excavated in the first coal pillar 4 along the edge of the goaf 14 of the first stope, the first coal pillar 4 is divided into two parts, namely a first reserved coal pillar 41 and a first recoverable coal pillar 43, by the second roadway 42, and the first recoverable coal pillar 43 can be stoped for recovery.
04: the first recoverable coal pillar 43 and the second recovery face 2 are recovered. Specifically, the first recoverable coal pillar 43 is brought into the recovery range of the second recovery working face 2, the second roadway 42 and the roadway 11 adjacent to the first recoverable coal pillar 43 are jointly used as the return air channel of the second recovery working face 2, and the first recoverable coal pillar 43 is simultaneously recovered when the second recovery working face 2 is recovered, so that the first recoverable coal pillar 43 is recovered, and the high-proportion recovery of the first coal pillar 4 is realized.
The method for improving the recovery rate of the coal pillars on the double-lane driving working face and the stability of the lane provided by the embodiment of the invention not only can greatly improve the recovery rate of the coal pillars between the double lanes in the using process, but also can crack the advanced support section of the lane and the side high roof of the coal pillars on the premise of safety and explosion prevention, so that the supporting pressure caused by the extraction of the mining working face is greatly reduced, and the stability of surrounding rocks of the double lanes can be effectively ensured. The technology overcomes the difficult problems that the coal pillars between the double roadways cannot be recovered and the stability of surrounding rocks of the double roadways cannot be ensured in the traditional stoping work and supporting mode. The method for improving the coal pillar recovery rate and the roadway stability of the double-roadway driving face provided by the embodiment of the invention has the advantages of reasonable space-time collocation of each part, feasible technology, convenient construction, safety and high efficiency, and is convenient to apply to underground construction.
In one embodiment of the present invention, before the step of recovering the first recoverable coal pillar 43 and the second recovery face 2, the following steps are further included:
and (3) fracturing the roof obliquely above two sides of the third roadway 5, which are adjacent to the second stope face 2 and the second coal pillar 6 respectively. Specifically, roof pressure relief holes 21 are formed in the roof obliquely above two sides of the third roadway 5 adjacent to the second stope face 2 and the second coal pillar 6 respectively, high-pressure water fracturing equipment is used for impacting the roof pressure relief holes 21, the roof is fractured in sections under the impact of high-pressure water, roof pressure relief crack zones are formed in the roof of the third roadway 5 adjacent to the second stope face 2 and the second coal pillar 6 respectively, the high supporting pressure caused by the stope of the second stope face 2 is reduced by the pressure relief crack zones, meanwhile, the stress deformation of the second coal pillar 6 is reduced, and further a protection effect is formed on the third roadway 5 and the roadway 11 adjacent to the second coal pillar 6. The second stope face 2 and the first recoverable coal pillar 43 can be further stoped after a roof pressure relief fracturing zone is formed in the roof of the third roadway 5.
In one embodiment of the invention, the second stope goaf is formed after the second stope 2 is mined out. And selecting the position of a fourth roadway within the pressure relief protection range of the third roadway 5, and excavating the fourth roadway in the second coal pillar 6 along the edge of the goaf of the second stoping face. The fourth roadway divides the second coal pillar 6 into a second reserved coal pillar and a second recoverable coal pillar. And (4) stoping the second recoverable coal pillar and the third stoping face, and repeating the steps in sequence until all the recoverable coal pillars are stoped.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but 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 (9)
1. A method for improving the recovery rate of coal pillars on a double-roadway driving working face and the stability of roadways is characterized by comprising the following steps:
respectively fracturing a roof above two inclined sides of a first roadway, which are adjacent to a first stope face and a first coal pillar;
stoping the first stoping face until the stoping is empty;
excavating a second roadway in the first coal pillar, wherein the second roadway divides the first coal pillar into a first reserved coal pillar and a first recoverable coal pillar;
and stoping the first recoverable coal pillar and the second stoping face.
2. The method for improving coal pillar recovery and roadway stability of a double roadway driving face according to claim 1, further comprising, before the step of recovering the first recoverable coal pillar and the second recoverable coal pillar, the steps of:
and fracturing the top plate above the two inclined sides of the third roadway, which are adjacent to the second stope face and the second coal pillar, respectively.
3. The method for improving coal pillar recovery and roadway stability of a double roadway driving face according to claim 2, further comprising, after the step of recovering the first recoverable coal pillar and the second recoverable coal pillar, the steps of:
and emptying the second stope face.
4. The method for improving the coal pillar recovery rate and the roadway stability of the double-roadway driving face according to claim 3, further comprising the following steps of:
and excavating a fourth roadway in the second coal pillar, wherein the fourth roadway divides the second coal pillar into a second reserved coal pillar and a second recoverable coal pillar.
5. The method for improving the coal pillar recovery rate and the roadway stability of the double-roadway driving face according to claim 4, further comprising the following steps of:
and (4) stoping the second recoverable coal pillar, stoping a third stoping face, and repeating in sequence to stope all the recoverable coal pillars.
6. The method for improving coal pillar recovery rate and roadway stability of a double-roadway driving face according to claim 1, wherein the step of fracturing the roof obliquely above two sides of the first roadway adjacent to the first stope face and the first coal pillar respectively further comprises:
and respectively arranging roof pressure relief holes on the roof above the two inclined sides adjacent to the first stope face and the first coal pillar in the first roadway.
7. The method for improving the coal pillar recovery rate and the roadway stability of the double-roadway driving face according to claim 6, further comprising the following steps of:
and impacting the top plate pressure relief holes by using high-pressure water fracturing equipment to fracture the top plate.
8. The method for improving coal pillar recovery and roadway stability of a double roadway driving face according to claim 1, wherein the step of stoping the first stope face until mined out further comprises:
and mining the first stope face to form a first stope face goaf.
9. The method for improving coal pillar recovery and roadway stability of a double roadway driving face according to claim 8, wherein the step of excavating a second roadway in the first coal pillar further comprises:
and excavating the second roadway in the first coal pillar along the edge of the goaf of the first stope face.
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| CN202010796282.6A CN111894587A (en) | 2020-08-10 | 2020-08-10 | Method for improving recovery rate of coal pillars on double-lane driving working face and stability of lanes |
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| CN202010796282.6A CN111894587A (en) | 2020-08-10 | 2020-08-10 | Method for improving recovery rate of coal pillars on double-lane driving working face and stability of lanes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114575844A (en) * | 2022-02-25 | 2022-06-03 | 天地科技股份有限公司 | Roadway roof segmented pressure relief and reinforcement control method based on double-roadway excavation |
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| CN103266893A (en) * | 2013-05-08 | 2013-08-28 | 中国矿业大学(北京) | Application of non-coal-pillar coal mining method in under-protected stratum exploitation |
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Application publication date: 20201106 |