CN114000902A - Method for maintaining broken top plate of negative coal pillar roadway by grouting reinforcement anchor rod suspension - Google Patents
Method for maintaining broken top plate of negative coal pillar roadway by grouting reinforcement anchor rod suspension Download PDFInfo
- Publication number
- CN114000902A CN114000902A CN202111108204.3A CN202111108204A CN114000902A CN 114000902 A CN114000902 A CN 114000902A CN 202111108204 A CN202111108204 A CN 202111108204A CN 114000902 A CN114000902 A CN 114000902A
- Authority
- CN
- China
- Prior art keywords
- roadway
- layered
- roof
- grouting
- top plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000003245 coal Substances 0.000 title claims abstract description 30
- 230000002787 reinforcement Effects 0.000 title claims abstract description 22
- 239000000725 suspension Substances 0.000 title claims description 6
- 238000005065 mining Methods 0.000 claims abstract description 24
- 238000004873 anchoring Methods 0.000 claims abstract description 8
- 230000005641 tunneling Effects 0.000 claims abstract description 7
- 238000009412 basement excavation Methods 0.000 claims abstract description 5
- 238000010276 construction Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 239000011435 rock Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
-
- 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- 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
- E21D21/008—Anchoring or tensioning means
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention provides a method for maintaining broken top plates of a negative coal pillar roadway by suspending grouting reinforcement anchor rods, and belongs to the technical field of mining. Firstly, grouting and reinforcing a broken roof which is already caving after the top of a direct roof above a layered roadway is collapsed during upper-layer mining, so that the broken roof of the layered roadway is integrated; then, after the mining of the upper layered working face is finished and the crushed top plate of the layered roadway is also grouted, the layered roadway is tunneled; in the process of the layered roadway tunneling, a roof reinforced by grouting is suspended by a high-traction anchor rod to form a whole, so that the roof is suspended on a lateral hard roof; after the excavation and the anchoring of the layered roadway are finished, the layered working face is mined, and meanwhile, a broken top plate at a next layer is processed, or an upper layer roadway of the next working face is excavated; thus circulating. The method can effectively solve the problems of roof breakage, artificial roof bulging and deformation in the negative coal pillar roadway arrangement mode.
Description
Technical Field
The invention relates to the technical field of mining, in particular to a method for maintaining broken roof of a negative coal pillar roadway by suspending a grouting reinforcement anchor rod.
Background
With the continuous increase of the mining depth and the strength of mines in China, the number of rock burst mines gradually increases, and the mine mining design based on rock burst prevention and control and the high-stress coal rock mass pressure relief mode are diversified and complicated. The roadway layout based on the negative pillar mining mode is approved and widely applied to the layered mining of the thick coal seam in partial mines. The special surrounding rock structure of the negative coal pillar roadway arrangement mode can solve the problems of high stress and high elastic energy accumulation of the surrounding rock in the conventional roadway arrangement mode, and can eliminate the danger of roadway rock burst in the aspect of structural regulation. However, the problems of roof breakage and artificial false roof bulge faced by the arrangement mode of the negative coal pillar roadway are prominent, and particularly, the problem that the roof is difficult to maintain is more obvious when part of the underground layered roadway is directly exploited to exploit the caving gangue in a layered mode to be a direct roof.
At present, commonly used roof management methods are modes such as grouting and anchor net spraying, and the supporting mode achieves a good roof control effect in a conventional roadway arrangement mode, but is not completely suitable for roof crushing management in a negative coal pillar roadway arrangement mode. Part of the surrounding rock structures of the mine negative coal pillar roadway are composed of completely broken and caving waste rocks, a hollow part and a lateral suspension roof, and because the caving waste rocks mined in the upper layer are not completely filled in a goaf to form a waste rock roof and a hollow part, the anchoring and combining functions of anchor rod (cable) support in the arrangement mode of the negative coal pillar roadway cannot be embodied. Therefore, a new method for breaking the roof by grouting, reinforcing, suspending and maintaining a negative coal pillar roadway arrangement mode by using an anchor rod (cable) is urgently needed.
The invention provides a method for grouting and filling a broken top plate to form a new direct roof and then suspending the top plate by using a high-traction anchor rod (cable), which can effectively solve the problems of top plate breakage, artificial false roof bulge and deformation in a negative coal pillar roadway arrangement mode.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for maintaining a broken roof of a negative coal pillar roadway by suspending a grouting reinforcement anchor rod.
The method comprises the following steps:
s1: during upper-layer mining, after the top roof above the layered roadway is collapsed, implementing a grouting reinforcement process on the collapsed broken roof to enable the broken roof of the layered roadway to be a whole, wherein the grouting process is to start grouting from the bottom of the broken roof to enable the broken roof in a grouting range to be solidified into a whole;
s2: after the mining of the upper layered working face is finished and the grouting of the crushed top plate of the layered roadway is finished, tunneling the layered roadway;
s3: in the process of tunneling the layered roadway, a high-traction anchor rod is adopted to suspend and inject the reinforced broken top plate into a whole so as to suspend the broken top plate on a lateral hard top plate, wherein the strength of the high-traction anchor rod can bear the weight of the top plate in the suspension area of the anchor rod;
s4: after the excavation and the anchoring of the layered roadway are finished, the layered working face is mined, and meanwhile, the next layered crushing top plate is processed or the layered roadway on the next working face is excavated;
s5: and (5) circulating construction until the mining of the thick coal seam is finished.
When the upper layered working face is mined, the rear part of the working face is filled after the upper part of the working face is directly jacked to collapse, and the process of mining, bursting and filling is carried out at any time; the S1 specifically comprises the following steps: and when the upper layered working face is pushed to be mined until the direct roof is collapsed, grouting is carried out on the rear goaf, the mining of the upper layered working face is continued to be carried out after the grouting is solidified, and then the goaf formed behind the upper layered working face is grouted until the stoping of the working face is finished and the grouting is finished.
And in the S2, the broken top plate and the hollow formed by mining of the upper layered working face are not completely grouted, the grouting height is the height of the layered roadway, and a part of hollow is still left above the whole top plate of the roadway, so that the roadway is still in a pressure relief area.
And S3, replacing the high-traction anchor rod with an anchor cable, wherein the length of the high-traction anchor rod or the anchor cable meets the requirement that the whole broken top plate after grouting reinforcement can be suspended on the lateral hard top plate.
S3, adopting high-traction anchor rod (cable) to suspend the top plate on the lateral hard rock layer, which is a process of digging edge anchor; s4 and S5 are a cyclic reciprocating process until the recovery of the thick coal seam is finished.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the broken top plate is filled by grouting to form a new direct roof, and then the top plate is suspended by the high-traction anchor rod (cable), so that the problems of broken top plate and bulging and deformation of an artificial false roof in a negative coal pillar roadway arrangement mode are effectively solved.
Drawings
FIG. 1 is a schematic diagram of an arrangement mode of a negative coal pillar roadway in the method for maintaining a broken roof of the negative coal pillar roadway by suspending a grouting reinforcement anchor rod;
FIG. 2 is a schematic view of grouting reinforcement of a broken top plate of a roadway according to the invention;
fig. 3 is a schematic diagram of roadway excavation and anchoring according to the invention.
Wherein: 1-the present hierarchical roadway; 2, upper layered laneway; 3, next layered roadway; 4-upper layered working surface; 5-the layered working surface; 6, hollowing; 7-lateral hard top plate; 8, crushing a top plate; 9-a coal body; 10, grouting reinforcement; 11-the non-tunneled local hierarchical roadway; 12-high traction anchor rod; 13-an anchor section; 14-anchor rod tray.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a method for maintaining a broken top plate of a negative coal pillar roadway by suspending a grouting reinforcement anchor rod.
As shown in fig. 1, 2 and 3, the method comprises the steps of:
s1: in the coal body 9, when the upper layered working face 4 is mined, after the top of the layered roadway 1 is collapsed, a grouting reinforcement 10 process is carried out on the collapsed broken top plate 8, so that the broken top plate 8 of the layered roadway 1 becomes a whole;
in the grouting process, grouting can be performed at different places from the bottom plate of the roadway of the upper layered working face, the integrity of the top plate of the roadway of the upper layered working face is mainly ensured, the rear grouting condition can be seen from the working face, and the grouting is stopped when the roadway height is approximately reached, as shown in fig. 2; the method is a process of mining, caving and filling, when a working face is pushed to collapse from a direct roof, a grouting baffle is constructed behind a support and a roadway, a rear goaf is grouted, mining of the working face is carried out after grouting solidification, then grouting is carried out on the rear goaf until stoping of the working face is finished and grouting is finished;
s2: after the mining of the upper layered working face 4 is finished and the grouting of the crushed top plate 8 of the layered roadway 1 is finished, tunneling the non-tunneled layered roadway 11;
it should be noted that the crushed roof 8 and the hollow 6 are not completely grouted, and the grouting height is substantially equal to the roadway height. And excavating the non-excavated layered roadway 11 of the working face after the mining of the upper layered working face is finished and the rear goaf is gradually finished.
S3: in the process of tunneling the non-tunneled layered roadway 11, suspending the broken roof after grouting reinforcement 10 by using a high-traction anchor rod 12 to complete the whole, so that the broken roof is suspended on the lateral hard roof 7; one end of a high-traction anchor rod 12 is fixed on the broken top plate 8 of the grouting reinforcement 10 through an anchor rod tray 14, and the other end of the high-traction anchor rod penetrates into the lateral hard top plate 7 to form an anchoring section 13.
The process of digging and anchoring at the same time adopts anchor rods and anchor cables, or the selection of the length depends on the caving height of a working face, namely the height of the layer of the lateral hard top plate 7, so that the whole top plate after grouting reinforcement can be suspended on the lateral hard top plate 7;
s4: after the excavation and the anchoring of the layered roadway 1 are finished, the layered working face 5 is mined, and meanwhile, the broken top plate of the next layered roadway 3 is processed or a layered roadway 2 on the next working face is excavated;
s5: and (5) circulating construction until the mining of the thick coal seam is finished, and continuing the construction of the next continuous coal seam.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A method for maintaining a broken top plate of a negative coal pillar roadway by grouting reinforcement anchor rod suspension is characterized by comprising the following steps: the method comprises the following steps:
s1: during upper-layer mining, after the top roof above the layered roadway is collapsed, implementing grouting reinforcement technology on the collapsed broken roof to enable the broken roof of the layered roadway to be a whole, wherein the grouting technology starts grouting from the bottom of the broken roof to enable the broken roof in the grouting range to be solidified into a whole;
s2: after the mining of the upper layered working face is finished and the grouting of the crushed top plate of the layered roadway is finished, tunneling the layered roadway;
s3: in the process of tunneling the layered roadway, a high-traction anchor rod is adopted to suspend the whole crushed top plate after grouting reinforcement, so that the crushed top plate is suspended on a lateral hard top plate, wherein the strength of the high-traction anchor rod can bear the weight of the top plate in the suspension area of the anchor rod;
s4: after the excavation and the anchoring of the layered roadway are finished, the layered working face is mined, and meanwhile, the next layered crushing top plate is processed or the layered roadway on the next working face is excavated;
s5: and (5) circulating construction until the mining of the thick coal seam is finished.
2. The method for suspending and maintaining the broken roof of the negative coal pillar roadway by using the grouting reinforcement anchor rod according to claim 1, is characterized in that: the step S1 specifically includes: and when the upper layered working face is pushed to be mined until the direct roof is collapsed, grouting is carried out on the rear goaf, the mining of the upper layered working face is continued to be carried out after the grouting is solidified, and then the goaf formed behind the upper layered working face is grouted until the stoping of the working face is finished and the grouting is finished.
3. The method for suspending and maintaining the broken roof of the negative coal pillar roadway by using the grouting reinforcement anchor rod according to claim 1, is characterized in that: and in the S2, the broken top plate and the hollow formed by mining of the upper layered working face are not completely grouted, the grouting height is the height of the layered roadway, and a part of hollow is still left above the whole top plate of the roadway, so that the roadway is still in a pressure relief area.
4. The method for suspending and maintaining the broken roof of the negative coal pillar roadway by using the grouting reinforcement anchor rod according to claim 1, is characterized in that: and in the S3, the anchor rod with high traction can be replaced by an anchor cable, and the length of the anchor rod or the anchor cable meets the requirement that the whole broken roof after grouting reinforcement can be suspended on the lateral hard roof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111108204.3A CN114000902B (en) | 2021-09-22 | 2021-09-22 | Method for suspension maintenance of broken roof of negative coal pillar roadway by grouting reinforced anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111108204.3A CN114000902B (en) | 2021-09-22 | 2021-09-22 | Method for suspension maintenance of broken roof of negative coal pillar roadway by grouting reinforced anchor rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114000902A true CN114000902A (en) | 2022-02-01 |
| CN114000902B CN114000902B (en) | 2022-12-27 |
Family
ID=79922170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111108204.3A Active CN114000902B (en) | 2021-09-22 | 2021-09-22 | Method for suspension maintenance of broken roof of negative coal pillar roadway by grouting reinforced anchor rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114000902B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195426A (en) * | 2013-04-22 | 2013-07-10 | 中国矿业大学(北京) | Steep-coal-seam long wall face non-pillar coal mining method |
| CN103233740A (en) * | 2013-04-22 | 2013-08-07 | 中国矿业大学(北京) | Top-cutting roadway coal-pillar-free mining method of close-range thin coal seam |
| CN103244122A (en) * | 2013-05-13 | 2013-08-14 | 中国矿业大学 | Trinity coupling support stability control method for gob-side entry-driving coal pillar |
| CN103758567A (en) * | 2014-01-26 | 2014-04-30 | 山东科技大学 | Cracked roof caving region grouting filling method |
| CN106368705A (en) * | 2016-10-20 | 2017-02-01 | 山东科技大学 | Method for controlling rock burst during roadway tunneling in fault fracture zone |
| CN108643907A (en) * | 2018-05-11 | 2018-10-12 | 山东科技大学 | One kind being crushed direct top edge sky caving into lane without pillar mining method |
| CN109826628A (en) * | 2019-01-18 | 2019-05-31 | 山东科技大学 | Presplitting arching without pillar mining method under the conditions of a kind of tight roof |
| CN110080767A (en) * | 2019-04-03 | 2019-08-02 | 太原理工大学 | A kind of thick seam slicing system working face overlap joint method for arranging |
| CN110566238A (en) * | 2019-09-26 | 2019-12-13 | 中国矿业大学 | Mud rock roof small coal pillar gob-side roadway supporting structure and method thereof |
-
2021
- 2021-09-22 CN CN202111108204.3A patent/CN114000902B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195426A (en) * | 2013-04-22 | 2013-07-10 | 中国矿业大学(北京) | Steep-coal-seam long wall face non-pillar coal mining method |
| CN103233740A (en) * | 2013-04-22 | 2013-08-07 | 中国矿业大学(北京) | Top-cutting roadway coal-pillar-free mining method of close-range thin coal seam |
| CN103244122A (en) * | 2013-05-13 | 2013-08-14 | 中国矿业大学 | Trinity coupling support stability control method for gob-side entry-driving coal pillar |
| CN103758567A (en) * | 2014-01-26 | 2014-04-30 | 山东科技大学 | Cracked roof caving region grouting filling method |
| CN106368705A (en) * | 2016-10-20 | 2017-02-01 | 山东科技大学 | Method for controlling rock burst during roadway tunneling in fault fracture zone |
| CN108643907A (en) * | 2018-05-11 | 2018-10-12 | 山东科技大学 | One kind being crushed direct top edge sky caving into lane without pillar mining method |
| CN109826628A (en) * | 2019-01-18 | 2019-05-31 | 山东科技大学 | Presplitting arching without pillar mining method under the conditions of a kind of tight roof |
| CN110080767A (en) * | 2019-04-03 | 2019-08-02 | 太原理工大学 | A kind of thick seam slicing system working face overlap joint method for arranging |
| CN110566238A (en) * | 2019-09-26 | 2019-12-13 | 中国矿业大学 | Mud rock roof small coal pillar gob-side roadway supporting structure and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114000902B (en) | 2022-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107989614B (en) | The mining methods of the inclined thick ore body of disk rock crusher in a kind of back production | |
| CN111305876A (en) | Deep roadway anchoring-splitting grouting-hydraulic fracturing pressure relief cooperative control method | |
| CN108643907B (en) | Non-pillar mining method for broken direct roof caving roadway | |
| CN102996149B (en) | Support method for bolt-grouting composite crushing dynamic-pressure roadway soft rock roof by high-pre-stressed anchor cable | |
| CN112610251B (en) | Control method of coal mining roadway top plate | |
| CN103470261A (en) | Method for roadway driving along goaf under original roadway top plate of fully mechanized top coal caving goaf | |
| CN110344831B (en) | Roof-cutting pressure-relief non-coal-pillar gob-side entry-forming entry retaining method | |
| CN108374672B (en) | A method of reinforcing Deep Mine soft coal level roadway surrounding rock | |
| CN109538210A (en) | A kind of soft extremely irregularcoal seam fully mechanized coal face gob-side entry retaining method of high methane three | |
| CN103437766B (en) | In-situ fragmentation mining method | |
| CN113153295A (en) | Mining method for extremely thick hard coal | |
| CN113586086B (en) | Method for reinforcing weak broken bottom plate of semi-closed large-section roadway | |
| CN110566238A (en) | Mud rock roof small coal pillar gob-side roadway supporting structure and method thereof | |
| CN116537784B (en) | Stabilization method for small coal pillar gob-side entry driving | |
| CN114000902B (en) | Method for suspension maintenance of broken roof of negative coal pillar roadway by grouting reinforced anchor rod | |
| CN114087016B (en) | Caving-to-filling mining isolation top column pre-control supporting method | |
| CN207554077U (en) | The passive harmonious supporting construction of extreme rockburst tunnel master | |
| CN113622916B (en) | Stope point column supporting and reinforcing and recycling method | |
| CN111287749B (en) | Anti-impact method for wide excavation and narrow excavation of rock burst coal seam near-empty roadway | |
| CN110130958B (en) | Prevention and control method for gob-side entry retaining bottom heave | |
| CN111335896B (en) | Coal-pillar-free anti-impact method for wide narrow excavation of rock burst coal seam mining roadway | |
| CN107503778A (en) | The method that gob side entry retaining is realized using grouting cable anchor | |
| CN109372519B (en) | Tunneling construction method for hexagonal section of roadway | |
| CN111720120A (en) | Method for achieving pre-support by adopting two-step mining stope based on layered filling method | |
| CN102182498A (en) | Comprehensive laneway-supporting method for cracked area in coal mine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |