CN116480350A - Method for recovering support coal pillar - Google Patents
Method for recovering support coal pillar Download PDFInfo
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- CN116480350A CN116480350A CN202310463403.9A CN202310463403A CN116480350A CN 116480350 A CN116480350 A CN 116480350A CN 202310463403 A CN202310463403 A CN 202310463403A CN 116480350 A CN116480350 A CN 116480350A
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- 239000003245 coal Substances 0.000 title claims abstract description 235
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000008093 supporting effect Effects 0.000 claims abstract description 97
- 238000005520 cutting process Methods 0.000 claims abstract description 15
- 238000011084 recovery Methods 0.000 claims description 41
- 238000005553 drilling Methods 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 238000005422 blasting Methods 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims 5
- 238000005065 mining Methods 0.000 description 10
- 238000012806 monitoring device Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- 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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- 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)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention provides a method for recovering a supporting coal pillar, which comprises the following steps: step 1, roof cutting and pressure relief treatment is carried out on top plates on two sides of a supporting coal pillar; and 2, acquiring stress data in the support coal pillar after roof cutting and pressure relief, and recovering the support coal pillar if the stress data is smaller than a preset stress value. Through the technical scheme that this application provided, can solve among the prior art support coal pillar stress concentration, inconvenient problem of retrieving the support coal pillar.
Description
Technical Field
The invention relates to the technical field of support coal pillar recovery methods, in particular to a support coal pillar recovery method.
Background
At present, the mining resources of the mining area of the middle eastern part of China are drastically reduced, the resource reserve is seriously insufficient, and serious threat is formed to the safety development of the coal industry and even the energy industry of the area. However, when coal is mined before, surrounding rock of a roadway is ensured to be stable by reserving large-size supporting coal pillars, so that a large amount of coal residues are caused, the mining rate of coal is reduced, and therefore, the production of a mine can be maintained by recovering the residual supporting coal pillars. However, in the prior art, when the supporting coal pillar is recovered, most of the pressure of the top plate is transferred to the supporting coal pillar due to goaf on two sides of the supporting coal pillar, so that the stress concentration of the supporting coal pillar is caused, the risk of large-area collapse of the top plate caused by instability of the supporting coal pillar in the recovery process of the supporting coal pillar is increased, and even the life safety of staff can be endangered.
Disclosure of Invention
The invention provides a method for recovering a supporting coal pillar, which aims to solve the problems that the stress of the supporting coal pillar is concentrated and the supporting coal pillar is inconvenient to recover in the prior art.
The invention provides a method for recovering a supporting coal pillar, which comprises the following steps: step 1, roof cutting and pressure relief treatment is carried out on top plates on two sides of a supporting coal pillar; and 2, acquiring stress data in the support coal pillar after roof cutting and pressure relief, and recovering the support coal pillar if the stress data is smaller than a preset stress value.
Further, the step 1 specifically includes: drilling a plurality of drilling holes on the top plates at two sides of the supporting coal pillar, wherein the drilling holes are obliquely arranged, extend towards the direction far away from the supporting coal pillar, and perform blasting treatment on the top plates at two sides of the supporting coal pillar by utilizing the drilling holes.
Further, before executing step 2, the support coal pillar recovery method further includes: and step 3, obtaining the structural strength of the top plate and the radius of the recovery working surface, and determining a preset stress value according to the structural strength of the top plate and the radius of the recovery working surface.
Further, P is a preset stress value; p (P) 0 Is the stress of the regional original rock; a is the equivalent radius of the recovery working surface; c is the cohesive force of the roof medium; phi is the internal friction angle of the top plate medium; θ is an angle value in a polar coordinate system; r is the plastic damage radius of the recovery working surface under different angles; r is R max /R min Is the maximum and minimum recovery working surfaceThe calculation formula of the plastic failure radius ratio, P, is as follows:
and when the stress data is smaller than a preset stress value, recovering the supporting coal pillar.
Further, retrieve the support coal pillar, specifically include: the back and forth stoping is carried out along the extending direction of the supporting coal pillar so that the supporting coal pillar comprises an isolating coal wall, a first supporting coal wall and strips, wherein the isolating coal wall is positioned on two sides of the supporting coal pillar, the first supporting coal wall and the isolating coal wall are arranged at intervals, the first supporting coal wall is positioned between the two isolating coal walls, the strips are arranged between the two isolating coal walls, and the width of the isolating coal wall is larger than that of the first supporting coal wall.
Further, the support coal pillar further comprises a second support coal wall, the strips and the second support coal wall are arranged between the isolation coal wall and the first support coal wall in a staggered mode, the second support coal wall is located in the middle of the support coal pillar, and the width of the second support coal wall is larger than that of the first support coal wall.
Further, the aspect ratio of the first support coal wall is set between 0.4 and 0.7, and the aspect ratio of the isolation coal wall and the aspect ratio of the second support coal wall are both greater than 2.
Further, the top panel has a direct top and a base top, the base top being located above the direct top, the width of the strip being less than the ultimate span of the direct top.
Further, the number of the second supporting coal walls is n, the width of the supporting coal column is M, and the limit span of the basic top is L, wherein n=M/L-1.
Further, after executing the step 2, the method for recovering the supporting coal pillar further comprises the following steps: and 4, forming a working surface along the vertical direction by a strip for supporting one end of the coal pillar, and plugging the working surface.
By applying the technical scheme of the invention, roof cutting and pressure relief treatment is carried out on the top plates at two sides of the support coal pillar, so that the stress of the support coal pillar can be greatly reduced, then the stress data in the support coal pillar after roof cutting and pressure relief is obtained, and the support coal pillar can be recovered when the data is smaller than a preset stress value. Therefore, stress concentration of the supporting coal pillar can be avoided, so that the roof can be prevented from collapsing in a large area due to instability of the supporting coal pillar, and the life safety of staff is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 illustrates a top view of a supported coal pillar recovery method provided in accordance with an embodiment of the present invention;
FIG. 2 shows a partial enlarged view at A in FIG. 1;
fig. 3 shows a schematic diagram of a structure for supporting coal pillar reciprocating stoping according to an embodiment of the present invention;
FIG. 4 illustrates a side view of a support coal pillar recovery method provided in accordance with an embodiment of the present invention;
FIG. 5 illustrates a front view of a support coal pillar recovery method provided in accordance with an embodiment of the present invention;
FIG. 6 shows a graph of the pre-set stress values versus radius of the recovery work surface provided in accordance with an embodiment of the present invention.
Wherein the above figures include the following reference numerals:
10. supporting a coal pillar; 11. isolating the coal wall; 12. a first support coal wall; 13. a strap; 14. a second support coal wall;
20. a top plate; 21. directly pushing; 22. a base roof; 23. drilling holes;
31. a goaf; 32. stopping a mining line coal pillar;
41. a stress monitoring device; 42. coal mining equipment; 43. a conveyor; 44. and (5) a hydraulic prop.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 5, the present application provides a method for recovering a supporting coal pillar, the method for recovering a supporting coal pillar comprising: step 1, roof cutting and pressure relief treatment is carried out on top plates 20 on two sides of a supporting coal pillar 10; and 2, acquiring stress data in the support coal pillar 10 after roof cutting and pressure relief, and recovering the support coal pillar 10 if the stress data is smaller than a preset stress value.
By the technical scheme, roof cutting and pressure relief treatment is performed on the top plates 20 on two sides of the supporting coal pillar 10, so that the stress of the supporting coal pillar 10 can be greatly reduced, then the stress data in the supporting coal pillar 10 after roof cutting and pressure relief are obtained, and when the data are smaller than a preset stress value, the supporting coal pillar 10 can be recovered. In this way, stress concentration of the supporting coal pillar 10 can be avoided, so that the roof 20 can be prevented from collapsing in a large area due to instability of the supporting coal pillar 10, and the life safety of workers can be ensured.
If the stress data is greater than the pre-examination stress value, the recovery condition of the supporting coal pillar 10 is not met, but the existing supporting coal pillar 10 is large in size, the width of the supporting coal pillar 10 is generally between 50 and 60m, the length of the supporting coal pillar is between 2000 and 5000m, after the roof is cut and the pressure is relieved, the stress data of the supporting coal pillar 10 is greatly reduced firstly, then gradually and slowly reduced, and when the stress data is reduced below the preset stress value, the supporting coal pillar 10 can be recovered.
In addition, in the prior art, when a plurality of groups of mineable coal beds exist in a mine, stress concentration caused by the supporting coal pillars 10 left by the upper coal goaf 31 also increases risks of disasters such as tunnel roof fall, deformation of the top plate 20, rock burst and the like in the lower coal mining process, but after roof cutting and pressure relief are performed on the supporting coal pillars 10 left by the upper coal goaf 31, disasters such as tunnel roof fall, deformation of the top plate 20, rock burst and the like in the lower coal mining process can be avoided.
As shown in fig. 4, step 1 specifically includes: a plurality of holes 23 are drilled in the top plates 20 on both sides of the supporting coal pillar 10, the holes 23 are inclined, the holes 23 extend in a direction away from the supporting coal pillar 10, and blasting is performed on the top plates 20 on both sides of the supporting coal pillar 10 by the holes 23. So set up, be convenient for dismantle the roof 20 of the both sides of support coal pillar 10, can guarantee simultaneously and dismantle the effect. The roof cutting and pressure relief mode can adopt deep hole chemical blasting or physical blasting, and the roof cutting depth is not less than the thickness of the top plate 20.
Further, before executing step 2, the method for recovering the supporting coal pillar further includes step 3 of obtaining the structural strength of the top plate 20 and the radius of the recovery working surface, and determining the preset stress value according to the structural strength of the top plate 20 and the radius of the recovery working surface. By the arrangement, accuracy of the preset stress value can be guaranteed, and smooth recovery of the supporting coal pillar 10 can be guaranteed.
Specifically, P is a preset stress value; p (P) 0 The stress of the original rock in the area, namely the stress of the coal body before mining of the mine; p (P) 0 For recovering the equivalent radius of the working surface; c is the cohesion of the medium of the top plate 20; phi is the internal friction angle of the top plate 20 medium; θ is an angle value in a polar coordinate system; r is the plastic damage radius of the recovery working surface under different angles; r is R max /R min The calculation formula of P is as follows, wherein the calculation formula is that the ratio of the plastic damage radius of the maximum recovery working surface to the plastic damage radius of the minimum recovery working surface is:
the relation between P and R is shown in fig. 6, and the worker can measure the preset stress value P by using the first formula and the ratio of the maximum plastic damage radius to the minimum plastic damage radius of the recovery working surface, that is, the second formula, and recover the support coal pillar 10 when the measured stress data is smaller than the calculated preset stress value P, so that the accuracy of the preset stress value P can be ensured.
Specifically, the stress data may be monitored using the stress monitoring device 41.
If the top plate 20 is a middle hard or hard top plate 20, that is, if the structural strength of the top plate 20 is greater than twice the strength of the supporting coal pillar 10, the stress monitoring device 41 may also start the recovery operation of the supporting coal pillar 10 when monitoring the original rock stress in the area where the stress is less than 1.5 times; if the roof 20 is a medium-hard or lower roof 20, that is, if the structural strength of the roof 20 is less than twice the strength of the supporting coal pillar 10, the stress monitoring device 41 may start the recovery operation of the supporting coal pillar 10 when monitoring the raw rock stress in the region where the stress is less than 1.2 times.
Further, the recovery of the supporting coal pillar 10 specifically includes: the back and forth extraction is carried out along the extending direction of the supporting coal pillar 10, so that the supporting coal pillar 10 comprises isolating coal walls 11, first supporting coal walls 12 and strips 13, the isolating coal walls 11 are positioned on two sides of the supporting coal pillar 10, the first supporting coal walls 12 are arranged at intervals with the isolating coal walls 11, the first supporting coal walls 12 are positioned between the two isolating coal walls 11, the strips 13 are arranged between the two isolating coal walls 11, namely, the areas recovered by workers for the supporting coal pillar 10 form the strips 13, the areas not recovered form the coal walls, and the width of the isolating coal walls 11 is larger than that of the first supporting coal walls 12. So set up, keep apart coal wall 11 can effectively isolate strip 13 and goaf 31, avoid revealing of gas, keep apart coal wall 11 simultaneously and can support roof 20, avoid roof 20 to collapse to first support coal wall 12 can improve the rate of recovery of coal when supporting roof 20, avoid the waste of coal.
Specifically, when the supporting coal pillar is stoped, the coal mining equipment 42 and the conveyor 43 are used, and the conveyor 43 is arranged behind the coal mining equipment 42, so that coal can be timely conveyed to the outside.
The support coal pillar 10 further includes a second support coal wall 14, the strips 13 and the second support coal wall 14 are staggered between the isolation coal wall 11 and the first support coal wall 12, the second support coal wall 14 is located in the middle of the support coal pillar 10, and the width of the second support coal wall 14 is greater than that of the first support coal wall 12. By the arrangement, the second supporting coal wall 14 can further support the top plate 20, so that the stability of the top plate 20 can be further ensured, and the collapse of the top plate 20 is avoided.
Specifically, the aspect ratio of the first support coal wall 12 is set between 0.4 and 0.7, and the aspect ratio of the separation coal wall 11 and the aspect ratio of the second support coal wall 14 are both greater than 2. When the aspect ratio of the first supporting coal wall 12 is smaller than 0.4, the stability of the first supporting coal wall 12 is low, and the top plate 20 cannot be effectively supported, so that the recovery operation of the supporting coal pillar 10 cannot be ensured to be smoothly performed; when the aspect ratio of the first support coal wall 12 is greater than 0.7, the first support coal wall 12 is oversized, reducing the recovery rate of coal, thereby resulting in waste of resources; therefore, the aspect ratio of the first supporting coal wall 12 is set between 0.4 and 0.7, so that the stability of the first supporting coal wall 12 can be ensured, the supporting effect of the first supporting coal wall 12 is ensured, the recovery rate of coal can be ensured, and the waste of resources is avoided. Wherein the aspect ratio of the first support coal wall 12 may be set to 0.4, 0.5, 0.6 or 0.7, in this application the aspect ratio of the first support coal wall 12 is set to 0.5.
When the aspect ratio of the separation coal wall 11 and the aspect ratio of the second support coal wall 14 are smaller than 2, the top plate 20 cannot be effectively supported, so that the recovery work of the support coal pillar 10 cannot be guaranteed to be smoothly performed, and therefore, the aspect ratio of the separation coal wall 11 and the aspect ratio of the second support coal wall 14 are set to be larger than 2, so that the stability of the separation coal wall 11 and the second support coal wall 14 can be guaranteed, and the supporting effect of the separation coal wall 11 and the second support coal wall 14 can be guaranteed. Wherein the aspect ratio of the separation coal wall 11 and the second support coal wall 14 may be set to 2, 2.5 or 3, and in this application, the aspect ratio of the separation coal wall 11 and the second support coal wall 14 is set to 2.
Further, the top plate 20 has a direct top 21 and a base top 22, the base top 22 being located above the direct top 21, the ultimate span of the direct top 21 being smaller than the ultimate span of the base top 22, the width of the strip 13 being smaller than the ultimate span of the direct top 21. By the arrangement, collapse of the basic roof 22 and the direct roof 21 can be avoided, and smooth coal recovery operation is ensured.
Specifically, the number of second support coal walls 14 is n, the width of the support coal pillar 10 is M, and the ultimate span of the base roof 22 is L, where n=m/L-1. So configured, the second support coal wall 14 is able to effectively support the base roof 22, avoiding collapse of the base roof 22. When the value of n is smaller than 1, the second supporting coal wall 14 is not required to be arranged, so that the supporting coal pillar 10 can be effectively recycled, and the waste of resources is avoided.
After the step 2 is executed, the method for recovering the supporting coal pillar further comprises the following steps: and 4, forming a working surface along the vertical direction by a strip 13 for supporting one end of the coal pillar 10, and plugging the working surface. So set up, can avoid revealing of gas, further guarantee staff's life safety. In addition, when the supporting coal pillar 10 is recovered back and forth, the hydraulic prop 44 is arranged at the opening roadway at the outer side of the supporting coal pillar 10 so as to support the top plate 20 and ensure the smooth recovery work. Wherein, the side of goaf 31 is provided with stope coal pillar 32.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for recovering the supporting coal pillar is characterized by comprising the following steps of:
step 1, roof cutting and pressure relief treatment is carried out on top plates (20) supporting two sides of a coal pillar (10);
and 2, acquiring stress data in the support coal pillar (10) after roof cutting and pressure relief, and recovering the support coal pillar (10) if the stress data is smaller than a preset stress value.
2. The method for recycling the supporting coal pillar according to claim 1, wherein the step 1 specifically comprises:
drilling a plurality of drilling holes (23) on top plates (20) on two sides of the supporting coal pillar (10), wherein the drilling holes (23) are obliquely arranged, the drilling holes (23) extend towards a direction away from the supporting coal pillar (10), and blasting is conducted on the top plates (20) on two sides of the supporting coal pillar (10) through the drilling holes (23).
3. The support coal pillar recovery method of claim 1, further comprising, prior to performing step 2:
and 3, acquiring the structural strength of the top plate (20) and the radius of the recovery working surface, and determining the preset stress value according to the structural strength of the top plate (20) and the radius of the recovery working surface.
4. The method for recycling supporting coal pillars according to claim 1, wherein P is a preset stress value; p (P) 0 Is the stress of the regional original rock; a is the equivalent radius of the recovery working surface; c is the cohesive force of the medium of the top plate (20); phi is the internal friction angle of the top plate (20) medium; θ is an angle value in a polar coordinate system; r is notThe plastic damage radius of the recovery working surface under the same angle;
R max /R min the calculation formula of P is as follows, wherein the calculation formula is that the ratio of the plastic damage radius of the maximum recovery working surface to the plastic damage radius of the minimum recovery working surface is:
and recovering the supporting coal pillar (10) when the stress data is smaller than the preset stress value.
5. The method for recycling a supporting coal pillar according to claim 1, characterized in that the method for recycling the supporting coal pillar (10) comprises the following steps: along the extending direction who supports coal column (10) carries out reciprocal stoping, so that support coal column (10) include isolation coal wall (11), first support coal wall (12) and strip (13), isolation coal wall (11) are located support coal column (10) both sides, first support coal wall (12) with isolation coal wall (11) interval sets up, just first support coal wall (12) are located two between isolation coal wall (11), strip (13) set up two between isolation coal wall (11), isolation coal wall (11) width is greater than the width of first support coal wall (12).
6. The method for recycling the support coal pillar according to claim 5, wherein the support coal pillar (10) further comprises a second support coal wall (14), the strip (13) and the second support coal wall (14) are arranged between the isolation coal wall (11) and the first support coal wall (12) in a staggered manner, the second support coal wall (14) is positioned in the middle of the support coal pillar (10), and the width of the second support coal wall (14) is larger than that of the first support coal wall (12).
7. The supported coal pillar recovery method of claim 6, wherein an aspect ratio of the first supported coal wall (12) is set between 0.4 and 0.7, and an aspect ratio of the separation coal wall (11) and an aspect ratio of the second supported coal wall (14) are both greater than 2.
8. The supported coal pillar recovery method of claim 6, wherein the top plate (20) has a direct roof (21) and a base roof (22), the base roof (22) being located above the direct roof (21), the width of the strip (13) being less than the limit span of the direct roof (21).
9. The supported coal pillar recovery method of claim 8, wherein the number of second supported coal walls (14) is n, the width of the supported coal pillar (10) is M, and the ultimate span of the base roof (22) is L, where n = M/L "1.
10. The method of claim 5, further comprising, after performing step 2:
and 4, forming a working surface along the vertical direction by the strip (13) for supporting one end of the coal pillar (10), and plugging the working surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310463403.9A CN116480350A (en) | 2023-04-24 | 2023-04-24 | Method for recovering support coal pillar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310463403.9A CN116480350A (en) | 2023-04-24 | 2023-04-24 | Method for recovering support coal pillar |
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| CN116480350A true CN116480350A (en) | 2023-07-25 |
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| CN202310463403.9A Pending CN116480350A (en) | 2023-04-24 | 2023-04-24 | Method for recovering support coal pillar |
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- 2023-04-24 CN CN202310463403.9A patent/CN116480350A/en active Pending
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