CN111236968A - Rock burst roadway advanced support anti-impact method - Google Patents
Rock burst roadway advanced support anti-impact method Download PDFInfo
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- CN111236968A CN111236968A CN202010230870.3A CN202010230870A CN111236968A CN 111236968 A CN111236968 A CN 111236968A CN 202010230870 A CN202010230870 A CN 202010230870A CN 111236968 A CN111236968 A CN 111236968A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/005—Props; Chocks, e.g. made of flexible containers filled with backfilling material characterised by the material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/02—Non-telescopic props
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
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Abstract
The invention provides a rock burst roadway advance support anti-impact method which comprises the steps of collecting stress data of a working face advance roadway, and analyzing a supporting pressure range and a supporting pressure peak value of the working face advance roadway according to the stress data. And determining the support strength of the advance support pillar based on the support pressure peak value, and determining the pillar specification of the advance support pillar according to the support strength. And arranging a forepoling support column which meets the support column specification within the support pressure range. The forepoling support pillar after supporting in the embodiment of the invention does not need the maintenance and management of working personnel, reduces the workload of maintenance and repair, ensures the strict management of personnel in impact dangerous areas, obviously improves the effectiveness of the control and management of rock burst and meets the requirement of impact prevention.
Description
Technical Field
The invention relates to the technical field of coal mine safety mining, in particular to an impact ground pressure roadway advanced support anti-impact method.
Background
Coal mine disasters often cause casualties due to the concealment of disaster-causing factors of the coal mine disasters, and the control of million-ton death rate of coal mines in China is severely restricted. In recent years, the proportion of casualties caused by rock burst disasters leaps the top of casualties in coal mine accidents. The rock burst is used as a multi-factor coupling dynamic disaster, the inoculation process is very hidden, the starting of the impact, the energy transfer and the display are completed within a few seconds, the rock burst has the characteristics of burstiness, complexity, destructiveness and the like, various and most secondary disasters can be caused, casualties, equipment damage, roadway damage and the like are caused, the physical and mental health of coal mine workers is seriously threatened, the safe and efficient production of a mine is seriously influenced, and even the harmony and the stability of the society are seriously influenced.
At the present stage, scientific understanding is provided for the disaster-causing mechanism of the impact ground pressure and the prevention and treatment, and the like, but the following problems still exist: people should be forbidden to come in and go out of the front section of the working face of the empty roadway according to the danger degree of the front section, but the current front section reinforcement supporting mode is single prop or hydraulic support supporting, the management of equipment still needs the maintenance of the personnel, and the strict personnel access limiting management measures are difficult to implement, so that the maintenance personnel are not exposed in danger continuously, and the personnel in the range of the front supporting are frequently injured due to the death of rock burst.
Disclosure of Invention
In view of the above problems, the present invention is proposed to provide a method for protecting a roadway from impact ground pressure in advance support, which overcomes or at least partially solves the above problems, and can use a advance support pillar to support the advance roadway on a working face in advance, and the support pillar after support does not need to be maintained and managed by workers, thereby reducing the workload of maintenance and repair, ensuring strict management of workers in an impact dangerous area, significantly improving the effectiveness of control and management of impact ground pressure, and meeting the requirement of protecting against impact.
According to an aspect of the embodiment of the invention, a rock burst roadway advance support anti-impact method is provided, which comprises the following steps:
collecting stress data of a working face advanced roadway, and analyzing a supporting pressure range and a supporting pressure peak value of the working face advanced roadway according to the stress data;
determining the support strength of a forepoling support pillar based on the support pressure peak value, and determining the support specification of the forepoling support pillar according to the support strength;
and arranging a forepoling support column which meets the specification of the support column within the support pressure range.
Optionally, after setting a forepoling strut conforming to the strut specification in the bearing pressure range, the method further includes:
and after the working face is pushed to the working face advanced roadway, the advance supporting columns of the ends of the working face advanced roadway are cut by the coal mining machine.
Optionally, collecting stress data of the face advanced roadway includes:
respectively arranging a plurality of drilling stress meters on coal pillar walls and recovery walls on two sides of the working face advanced roadway;
and respectively acquiring the stress data of the working face advanced roadway by a plurality of borehole stressometers.
Optionally, analyzing a bearing pressure range and a bearing pressure peak value of the working face advanced roadway according to the stress data includes:
determining the working face advanced roadway range with the collected stress data larger than the original rock stress as a supporting pressure range;
the maximum of the stress data is selected as the peak bearing pressure.
Optionally, determining the support specification of the advance support according to the support strength includes:
selecting a support column material and the distribution ratio of each component in the support column material according to the support strength;
and determining the column radius of the advance support column according to the support strength and the selected column material.
Optionally, a forepoling strut conforming to the strut specifications is provided within the bearing pressure range, including:
determining the position layout of a to-be-set advanced support strut in the support pressure range;
and arranging a forepoling support column which meets the specification of the support column at the position where the forepoling support column is to be arranged.
Optionally, determining the position layout of the advance support pillars to be set in the support pressure range includes:
and determining the position spacing and the row spacing of the advanced support pillars to be set within the range of the supporting pressure based on the roadway width of the working face advanced roadway.
Optionally, the step of arranging a forepoling support pillar meeting the specification of the support pillar at a position where the forepoling support pillar is to be arranged includes:
selecting a constraint sleeve with a radius corresponding to the radius of the strut;
the restraining sleeve is hung on the roadway top plate corresponding to the position where the advance support pillar is to be arranged, and one end, facing the roadway bottom plate, of the restraining sleeve is in contact with the roadway bottom plate;
and injecting the support column material into the constraint sleeve to enable the support column material to be connected with the roadway top plate, and carrying out constraint molding on the support column material by the constraint sleeve to obtain the advance support column meeting the support column specification.
Optionally, injecting the strut material into the constraining sheath comprises:
hanging a flexible mold sleeve with the radius corresponding to the radius of the support pillar on the top plate of the roadway and arranging the flexible mold sleeve on the inner side of the constraint sleeve;
injecting the strut material into a flexible mold sleeve within the constraining sleeve.
Optionally, the constraining sheath comprises a corrugated sheath.
According to the embodiment of the invention, the support pressure range and the support pressure peak value of the working face forepoling are analyzed, so that the support strength of the forepoling support is determined based on the support pressure peak value, the support specification of the forepoling support is determined according to the support strength, and the forepoling support conforming to the support specification is arranged in the support pressure range. Therefore, the embodiment of the invention adopts the advance support pillar to advance support the advance roadway of the working face, and the supported advance support pillar does not need the maintenance and management of workers, thereby reducing the workload of maintenance and repair. Because the working face advanced roadway belongs to a strong impact dangerous area, the advanced supporting pillars are adopted for supporting, so that strict management on personnel impacting the dangerous area is ensured, the effectiveness of rock burst prevention and control management is obviously improved, and the anti-impact requirement is also met.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
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 and not to limit the invention. In the drawings:
fig. 1 is a schematic flow chart of a rock burst roadway advance support anti-impact method according to an embodiment of the invention;
fig. 2 shows a schematic structural view of a face forepoling roadway provided with forepoling pillars according to an embodiment of the present invention;
figure 3 shows a cross-sectional view of a face foreway according to figure 2 provided with forepoling struts;
fig. 4 shows a schematic structural view of a forepoling strut in a face forepoling according to an embodiment of the invention;
in fig. 2-4, the working face leads the roadway 1; a forepoling strut 2; an anchor rod 3; an anchor cable 4; a constraining sheath 5; a roadway roof 6; a roadway floor 7; an injection port 8; leveling the lying bottom 9; a centre line 10 of the roadway.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In order to solve the technical problem, the embodiment of the invention provides an advance support anti-impact method for a rock burst roadway. Fig. 1 shows a flow chart of a rock burst roadway advance support anti-impact method according to an embodiment of the invention. Referring to fig. 1, the method includes steps S102 to S106.
And S102, collecting stress data of the working face advanced roadway, and analyzing a supporting pressure range and a supporting pressure peak value of the working face advanced roadway according to the stress data.
In the embodiment of the invention, the working face advancing roadway refers to a stoping roadway which is ahead of the coal face by a certain distance. For the rock burst roadway, the advance region of the working face air return roadway is a region with a strong impact risk, so that the advance roadway of the working face in the embodiment of the invention can be the advance region of the working face air return roadway.
And step S104, determining the support strength of the advance support pillar based on the support pressure peak value, and determining the pillar specification of the advance support pillar according to the support strength.
And step S106, setting a forepoling support column which meets the support column specification in the support pressure range.
According to the embodiment of the invention, the advance support pillar is adopted to advance support the advance roadway of the working face, and the supported advance support pillar does not need maintenance and management of workers, so that the workload of maintenance and repair is reduced. Because the working face advanced roadway belongs to a strong impact dangerous area, the advanced supporting pillars are adopted for supporting, so that strict management on personnel impacting the dangerous area is ensured, the effectiveness of rock burst prevention and control management is obviously improved, and the anti-impact requirement is also met.
In an embodiment of the invention, after the advance support pillars meeting the pillar specification are arranged in the bearing pressure range, after the working face is pushed to the working face advance roadway, the advance support pillars at the ends of the advance roadway of the working face can be cut by the coal mining machine.
In the embodiment of the invention, a coal cutter can be adopted to cut the advance support pillar at the end of the advance roadway of the working face in time in the pushing and mining process of the working face so as to remove the supporting effect of the high-strength advance support pillar on the top plate of the roadway, the pillar part after cutting and crushing can be directly conveyed out by a scraper conveyor, and the remaining part can be used as a natural filling material of a goaf of the roadway so as to ensure that the top plate behind the remaining roadway of the working face is stably collapsed, and the advance support unmanned management of the empty roadway of the working face is realized. In addition, when the advance support pillar is cut by the coal mining machine, sparks cannot be generated, and the safety of the pushing and mining process is ensured.
Referring to step S102 above, in an embodiment of the invention, a borehole stress meter may be used to collect stress data of the face advanced roadway. Specifically, a plurality of drilling stress meters are respectively arranged on the coal pillar side and the stoping side on two sides of the working face advanced roadway, so that stress data of the working face advanced roadway are respectively collected through the plurality of drilling stress meters.
For example, a plurality of borehole stressometers are installed in an adjacent air return roadway which is out of the tangential hole and is advanced by 220 m. Stress data of the air-bound return air roadway are collected by the aid of the borehole stressometers, and a supporting pressure distribution rule of the air-bound return air roadway can be analyzed according to the collected stress data, so that basis is provided for determination of a supporting pressure influence range and a supporting pressure peak value of the air-bound return air roadway. This embodiment can set up 12 monitoring stations, and the intergroup of every group is apart from 20m, installs 24 drilling stress meters altogether, and every monitoring station of group contains 2 drilling stress meters, and one is arranged in the pillar group, and another is arranged in the back production group. Therefore, 12 hole stress meters are arranged on the coal pillar side, and 12 hole stress meters are arranged on the stoping side. The installation depth of each drilling stress meter can be in the range of 7-15 m, the installation aperture can be in the range of 45-48 mm, and the drilling stress meters can realize 24-hour on-line transmission of coal seam stress. The layout of the borehole stressmeter is not particularly limited in the embodiments of the present invention.
With continued reference to step S102 above, in one embodiment of the invention, when analyzing the support pressure range of the face advance roadway based on the stress data, the face advance roadway range in which the collected stress data is greater than the original rock stress may be determined as the support pressure range. When the support pressure peak value of the working face advanced roadway is analyzed according to the stress data, the maximum value in the stress data can be selected as the support pressure peak value.
In combination with the above embodiment, if a plurality of borehole stress meters are used to collect the stress data of the working surface advanced roadway, the stress data greater than the original rock stress can be selected from the stress data of the working surface advanced roadway collected by the plurality of borehole stress meters, and the range of the borehole stress meter corresponding to the stress data greater than the original rock stress is determined as the support pressure range. And the maximum value can be selected from the stress data of the working face advanced roadway collected by a plurality of drilling stress meters to be used as the peak value of the supporting pressure.
Referring to step S104, in an embodiment of the present invention, when determining the supporting strength of the advance supporting pillar based on the peak supporting pressure, the supporting strength of the advance supporting pillar may be determined comprehensively by considering factors such as the inclination angle of the coal seam, the self-weight stress of the top plate, and the volume weight of the top plate rock stratum, in addition to the peak supporting pressure, and this is not particularly limited in the embodiment of the present invention.
In an embodiment of the present invention, the pillar specifications of the advance support pillar may include a material of the pillar, a ratio of components in the material, a radius of the pillar, and the like. Therefore, when the support specification of the advance support is determined according to the support strength, the support material and the component distribution ratio of the support material can be selected according to the support strength, and the support radius of the advance support can be determined according to the support strength and the selected support material.
In this embodiment, when the specification of the advance support pillar is determined, it should be ensured that the actual bearing strength of the advance support pillar is slightly greater than the determined support strength of the advance support pillar, and a certain margin coefficient is reserved to ensure safe and effective support of the advance support pillar.
In the embodiment of the invention, the strut material can be selected from quick-setting materials, such as ZKD high-water materials, ZKD high-water materials belong to one of the quick-setting materials, and are novel inorganic hydraulic setting materials with high cement ratio and pumpability. The high-water-content material quick-setting mortar is generally composed of a component A and a component B, wherein the component A comprises an aluminum hydrochloric acid or sulphoaluminate cement sintering material, a suspending agent, a retarder and a dispersing agent, and the component B comprises gypsum and lime composite quick-setting, early strength agent and a suspending dispersing agent.
Referring to step S106 above, in an embodiment of the present invention, the process of setting the advance support strut conforming to the strut specification in the support pressure range may include step a1 and step a 2.
Step A1, determining the position layout of the advance support pillars to be set in the support pressure range.
In the embodiment of the invention, in order to ensure good ventilation in the working face advance roadway, when the position layout of the advance support pillars to be arranged in the supporting pressure range is determined, the width of the working face advance roadway needs to be considered, and the position spacing and the row spacing of the advance support pillars to be arranged in the supporting pressure range are determined based on the roadway width of the working face advance roadway. For the working face advance roadway with narrow width, a few rows of advance support pillars can be arranged in the width direction of the working face advance roadway, such as two rows of advance support pillars. For the working face advance roadway with wide width, a plurality of rows of advance support pillars can be arranged in the width direction of the working face advance roadway, such as three rows of advance support pillars. The distance layout of the advance support pillars can be determined according to the stress layout of the advance roadway of the working face, and the position layout of the advance support pillars to be arranged in the bearing pressure range is not specifically limited by the embodiment of the invention.
For example, referring to fig. 2 and 3, in this embodiment, the clear width of the face advance roadway 1 is 5000mm, the clear height is 3800mm, two rows of advance support pillars 2 are arranged in the face advance roadway 1, the pillar diameter of the advance support pillars 2 is 600mm, the height is 3800mm, and the pitch of the advance support pillars 2 is 1.6 m. Moreover, the two rows of forepoling pillars 2 can also be symmetrical relative to the roadway central line 10 of the working face forepoling roadway 1.
In the embodiment of the invention, in order to protect the surface of the working face advance roadway 1, anchor rods 3 and anchor cables 4 are also arranged in advance in the working face advance roadway 1, in the embodiment, the pitch of the anchor rods 3 is 0.85 × 0.8m, the size is phi 22-2400, namely the diameter of the anchor rods 3 is 22mm, and the length is 2400 mm. The pitch of the anchor cables 4 is 1.2 x 1.6m, and the size is phi 21.8-7500, namely the diameter of the anchor cable 4 is 21.8mm, and the length is 7500 mm.
And step A2, arranging a forepoling support post meeting the support post specification at the position where the forepoling support post is to be arranged.
In this embodiment, as shown in fig. 4, the advance support pillars 2 conforming to the pillar specifications may be provided by injecting a pillar material into the restraining sleeve 5.
First, a constraining sheath 5 of a radius corresponding to the strut radius is selected.
In the embodiment of the invention, the radius of the constraint sleeve 5 can be slightly larger than the radius of the strut, so that after the strut material is injected into the constraint sleeve 5 subsequently, the strut material is constrained and molded by the constraint sleeve 5 to obtain the advance support strut 2 which meets the radius of the strut. The constraining sheath 5 may comprise a corrugated sheath, such as a steel strip corrugated sheath. Of course, other types of constraining sleeves 5 may be used, and embodiments of the present invention are not particularly limited in this regard.
Then, a restraining sleeve 5 is hung on a roadway top plate 6 corresponding to the position of the advance support pillar 2 to be arranged, and one end, facing the roadway bottom plate 7, of the restraining sleeve 5 is in contact with the roadway bottom plate 7.
According to the embodiment of the invention, the constraint sleeve 5 is hung on the roadway roof 6, so that the full roof contact of the subsequently formed advanced support pillar 2 and the verticality of the advanced support pillar 2 can be ensured, the advanced support pillar 2 is not easy to topple even under the action of unbalance loading impact force, and the advanced support pillar 2 is cut by a coal mining machine more safely.
Further, a support material is injected into the restraining sleeve 5 so as to be in contact with the roadway roof 6, and the restraining sleeve 5 restrains and molds the support material to obtain the advance support 2 conforming to the support standard.
In the embodiment of the invention, the constraint sleeve 5 can be further provided with the injection port 8, and the column material is injected into the constraint sleeve 5 from the underground injection point through the injection port 8 by using the injection pump station, so that the materials of all components in the column material interact under the constraint force of the constraint sleeve 5, the strength and plasticity of the column material can be improved by applying confining pressure to the column material, and good molding is ensured. And, need to guarantee that the pillar material meets with working face advance tunnel roof 6 to form advance support pillar 2 after the pillar material forms the support to working face advance tunnel roof 6.
In an alternative embodiment of the present invention, a flexible mold sleeve (not shown) with a radius corresponding to the radius of the support pillar may be hung on the roadway roof 6, and the flexible mold sleeve is arranged inside the constraint sleeve 5. The material filling opening 8 is communicated with the flexible mold sleeve, a grouting pump station is used for filling the support column material into the flexible mold sleeve from an underground grouting point through the material filling opening 8, and the constraint sleeve 5 is used for constraint forming of the support column material outside the flexible mold sleeve.
In an optional embodiment of the present invention, in order to ensure that the advance support pillar 2 is firmer on the roadway floor 7, a leveling bottom 9 may be further disposed on the roadway floor 7 corresponding to the position where the advance support pillar 2 is to be disposed, so that when the pillar material is injected into the flexible mold sleeve, a part of the pillar material enters the leveling bottom 9, thereby ensuring that the bottom of the advance support pillar 2 is more stable and the advance support pillar 2 is firmer.
All or a portion of the steps of implementing the foregoing method embodiments may be performed by hardware (e.g., a computing device such as a personal computer, a server, or a network device) associated with program instructions, which may be stored in a computer-readable storage medium, and when the program instructions are executed by a processor of the computing device, the computing device performs all or a portion of the steps of the method described in the embodiments of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments can be modified or some or all of the technical features can be equivalently replaced within the spirit and principle of the present invention; such modifications or substitutions do not depart from the scope of the present invention.
Claims (10)
1. The rock burst roadway advance support anti-impact method is characterized by comprising the following steps:
collecting stress data of a working face advanced roadway, and analyzing a supporting pressure range and a supporting pressure peak value of the working face advanced roadway according to the stress data;
determining the support strength of a forepoling support pillar based on the support pressure peak value, and determining the support specification of the forepoling support pillar according to the support strength;
and arranging a forepoling support column which meets the specification of the support column within the support pressure range.
2. The method of claim 1, further comprising, after setting a forepoling strut conforming to the strut specifications within the bearing pressure range:
and after the working face is pushed to the working face advanced roadway, the advance supporting columns of the ends of the working face advanced roadway are cut by the coal mining machine.
3. The method of claim 1 or 2, wherein collecting stress data for a face lead roadway comprises:
respectively arranging a plurality of drilling stress meters on coal pillar walls and recovery walls on two sides of the working face advanced roadway;
and respectively acquiring the stress data of the working face advanced roadway by a plurality of borehole stressometers.
4. The method of claim 1 or 2, wherein analyzing the bearing pressure range and bearing pressure peak of the face advanced roadway from the stress data comprises:
determining the working face advanced roadway range with the collected stress data larger than the original rock stress as a supporting pressure range;
the maximum of the stress data is selected as the peak bearing pressure.
5. The method of claim 1 or 2, wherein determining the strut specifications of the advance support strut in accordance with the support strength comprises:
selecting a support column material and the distribution ratio of each component in the support column material according to the support strength;
and determining the column radius of the advance support column according to the support strength and the selected column material.
6. The method of claim 5, wherein placing a forepoling strut conforming to the strut specifications within the bearing pressure range comprises:
determining the position layout of a to-be-set advanced support strut in the support pressure range;
and arranging a forepoling support column which meets the specification of the support column at the position where the forepoling support column is to be arranged.
7. The method of claim 6, wherein determining the placement of the advance support strut to be placed within the bearing pressure range comprises:
and determining the position spacing and the row spacing of the advanced support pillars to be set within the range of the supporting pressure based on the roadway width of the working face advanced roadway.
8. The method of claim 6, wherein placing a forepoling strut conforming to the strut specifications at a location where a forepoling strut is to be placed comprises:
selecting a constraint sleeve with a radius corresponding to the radius of the strut;
the restraining sleeve is hung on the roadway top plate corresponding to the position where the advance support pillar is to be arranged, and one end, facing the roadway bottom plate, of the restraining sleeve is in contact with the roadway bottom plate;
and injecting the support column material into the constraint sleeve to enable the support column material to be connected with the roadway top plate, and carrying out constraint molding on the support column material by the constraint sleeve to obtain the advance support column meeting the support column specification.
9. The method of claim 8, wherein injecting the post material into the constraining sheath comprises:
hanging a flexible mold sleeve with the radius corresponding to the radius of the support pillar on the top plate of the roadway and arranging the flexible mold sleeve on the inner side of the constraint sleeve;
injecting the strut material into a flexible mold sleeve within the constraining sleeve.
10. The method of claim 8,
the constraining sheath comprises a bellows sheath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010230870.3A CN111236968B (en) | 2020-03-27 | 2020-03-27 | Rock burst roadway advanced support anti-impact method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010230870.3A CN111236968B (en) | 2020-03-27 | 2020-03-27 | Rock burst roadway advanced support anti-impact method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111236968A true CN111236968A (en) | 2020-06-05 |
| CN111236968B CN111236968B (en) | 2022-01-18 |
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| CN111236968B (en) | 2022-01-18 |
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