CN112127926A - Support method for narrow coal pillar in gob-side entry driving - Google Patents
Support method for narrow coal pillar in gob-side entry driving Download PDFInfo
- Publication number
- CN112127926A CN112127926A CN202011072364.2A CN202011072364A CN112127926A CN 112127926 A CN112127926 A CN 112127926A CN 202011072364 A CN202011072364 A CN 202011072364A CN 112127926 A CN112127926 A CN 112127926A
- Authority
- CN
- China
- Prior art keywords
- gob
- anchor cable
- coal
- narrow
- entry driving
- 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.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
Abstract
The invention relates to the technical field of gob-side entry driving, in particular to a support method for narrow coal pillars in gob-side entry driving. The invention provides a novel support method for narrow coal pillars in gob-side entry driving, aiming at solving the problem that the support method for narrow coal pillars in the prior art can not ensure the stability of the narrow coal pillars: firstly, constructing an anchor cable on a roadway of a coal face section of an adjacent section, wherein the anchor cable penetrates through the other side of the reserved narrow coal pillar, and meanwhile, anchoring one end of the anchor cable close to the goaf side; and (3) after the stoping of the coal face of the adjacent section is finished and the overlying rock stratum of the adjacent section is stabilized, tunneling along the air, exposing one end of the anchor cable on the other side of the narrow coal pillar during tunneling, cleaning the anchoring agent and the coal blocks, sequentially installing a tray and a lock and tensioning the tray and the lock. The support method is simple, convenient and quick to operate, and anchor cables do not need to be rearranged on one side of the gob-side entry driving narrow coal pillar, so that support materials and construction time are saved.
Description
Technical Field
The invention relates to the technical field of gob-side entry driving, in particular to a support method for narrow coal pillars in gob-side entry driving.
Background
In recent years, as the mining strength of a mine is improved, the mining depth rapidly extends downwards, the mining relation is generally tense, the mining mode is gradually changed into large mining height and fully mechanized caving mining, the section of a roadway is gradually increased, and gob-side entry driving under complex geological conditions such as a composite roof, a thick-layer shale roof, a thick coal bed, a three-soft coal bed, high ground stress and the like is increasingly increased. The gob-side entry driving is to drive a tunnel along the edge of a goaf or a narrow coal pillar, and aims to isolate the tunnel from the goaf and maintain the long-time stability of gob-side entry driving to be a main challenge of surrounding rock maintenance in a coal mine, particularly the stability problem of the narrow coal pillar. Research and practice show that: the stability of the narrow coal pillar plays a decisive role in the maintenance condition of the gob-side entry driving surrounding rock. At present, an anchor rod (cable) support is commonly adopted for narrow coal pillar support, support of one side, close to a goaf, of a narrow coal pillar is carried out after roadway driving of a coal face section of an adjacent section of the goaf is completed, first anchor cable holes are drilled in one side, close to the goaf, of the narrow coal pillar one by one, an anchoring agent is fed into the hole bottoms of the first anchor cable holes one by one, then one end of a first anchor cable is rapidly inserted into the hole bottoms of the first anchor cable holes, and a first tray and a first lock are sequentially installed at the other end of the first anchor cable and are tensioned, so that the other end of the first anchor cable is anchored; after the mining of the coal face of the adjacent section is finished and the overlying rock stratum of the adjacent section is stabilized, tunneling along a hollow roadway is carried out, second anchor cable holes are drilled in the other side of the narrow coal pillar one by one after the tunneling is finished, anchoring agents are fed into the hole bottom of the second anchor cable holes one by one, then one end of a second anchor cable is rapidly inserted into the hole bottom of the second anchor cable holes, a second tray and a second lock are sequentially installed at the other end of the second anchor cable and are tensioned, and therefore the anchoring of the other end of the second anchor cable is achieved.
Disclosure of Invention
The invention provides a novel support method for narrow coal pillars in gob-side entry driving, aiming at solving the problem that the existing support method for narrow coal pillars can not ensure the stability of the narrow coal pillars.
The invention is realized by adopting the following technical scheme: a support method of narrow coal pillars in gob-side entry driving is realized by the following steps:
1) determining the width a of the reserved narrow coal pillar according to the earth surface movement rule;
2) tunneling in a section roadway of an adjacent section of the goaf, and after the tunneling is finished, supporting a coal wall of a reserved narrow coal pillar on one side close to the goaf: firstly, drilling anchor cable holes one by one on the coal wall of one side, close to a goaf, of a reserved narrow coal pillar, wherein the anchor cable holes penetrate through the reserved narrow coal pillar along the width direction of the reserved narrow coal pillar and extend to a reserved gob-side driving roadway, the length of each extending part is L, secondly, an anchoring agent is fed into the hole bottom of each anchor cable hole one by one, then, one end of each anchor cable is inserted into the hole bottom of each anchor cable, the other end of each anchor cable is exposed out of the goaf side of the narrow coal pillar, and a first tray and a first lock are sequentially installed on the other end of each anchor cable and then tensioned, so that the other end of each anchor cable is anchored;
3) after the stoping of the coal face of the adjacent section of the goaf is finished and the overlying rock stratum of the goaf is stabilized, the goaf starts to tunnel in a reserved gob-side tunnel (during construction, technicians generally exchange the arrangement condition of a support diagram with a tunneling operator in advance, so that the tunneling operator can tunnel around the position of the anchor cable in advance without damaging the anchor cable during tunneling), after the tunneling is finished, firstly, coal on one end of the anchor cable on the gob-side tunnel side is removed one by one, one end of the anchor cable is exposed out of the gob-side tunnel, then, the anchoring agent on one end of the anchor cable is removed one by one, and finally, a second tray and a second lock are sequentially installed on one end of the anchor cable one by one and are tensioned, so that the anchoring of the anchor cable is realized.
The beneficial effects produced by the invention are as follows: the invention takes overall consideration of the support of the narrow coal pillar near the roadway side of the coal face section of the adjacent section and the support of the gob-side entry driving side, breaks through the idea that the two sides of the traditional narrow coal pillar need to be respectively supported by anchor cables, creatively adopts the mode that the anchor cables are firstly supported on one side, and the anchor cables penetrate through the other side of the narrow coal pillar, so that the anchor cables do not need to be rearranged when the other side of the narrow coal pillar is supported, the material cost of the anchor cable support is saved, the support method is simple, convenient and quick to operate, the support time is saved, meanwhile, the anchor cable support systems on the two sides of the narrow coal pillar are connected into a whole, the integral support strength of the anchor cables is greatly improved, and the stability of the narrow coal pillar is ensured. The support method is an efficient support method for narrow coal pillars in gob-side entry driving, and has wide practicability in the technical field.
Drawings
FIG. 1 is a schematic view showing the completion state of step 2) in the supporting method of the present invention;
fig. 2 is a final completion state diagram of the supporting method of the present invention.
In the figure: 1-narrow coal pillar, 2-gob-side entry driving, 3-goaf, 4-roadway of coal face section of adjacent section, 5-anchor cable, 6-anchoring agent, 7-first tray, 8-first lock, 9-second tray, 10-second lock, and 11-coal face of adjacent section.
Detailed Description
A support method of narrow coal pillars in gob-side entry driving is realized by the following steps:
1) determining the width a of the reserved narrow coal pillar 1 according to the earth surface movement rule;
2) tunneling in a section drift 4 of an adjacent section of the gob 3, and after the tunneling is finished, supporting the coal wall of the reserved narrow coal pillar 1 close to the gob 3: firstly, drilling anchor cable holes one by one on the coal wall of one side, close to a goaf 3, of a reserved narrow coal column 1, wherein the anchor cable holes penetrate through the reserved narrow coal column 1 along the width direction of the reserved narrow coal column 1 and extend to a reserved gob-side entry driving 2, the length of the extending part is L, then, feeding an anchoring agent 6 into the hole bottom of each anchor cable hole one by one, inserting one end of each anchor cable 5 into the hole bottom of each anchor cable hole, exposing the other end of each anchor cable 5 to the goaf 3 side of the narrow coal column 1, sequentially mounting a first tray 7 and a first lockset 8 on the side of each anchor cable 5, and then tensioning the anchor cables, so that the other end of each anchor cable 5 is anchored;
3) after the stoping of the coal face 11 of the adjacent section of the goaf 3 is finished and the overlying rock stratum of the goaf 3 is stabilized, the excavation is started in the reserved gob-side entry 2, after the excavation is finished, firstly, coal on one end of the anchor rope 5 on the gob-side entry 2 side is removed one by one, so that one end of the anchor rope 5 is exposed out of the gob-side entry 2, then, the anchoring agent 6 on one end of the anchor rope 5 is removed one by one, and finally, a second tray 9 and a second lock 10 are sequentially installed on one end of the anchor rope 5 one by one and are tensioned, so that the anchoring of one end of the anchor rope 5 is realized.
During specific implementation, the length L of the extending portion is not less than 300mm, namely, one end of the anchor cable 5 located along the gob-side entry driving 2 is not less than 300mm, one end of the anchor cable 5 is ensured to have enough length to be provided with the first tray 7 and the second lock 10, and one end of the anchor cable 5 is ensured not to be loosened and lose efficacy under the action of tensile stress.
The length of the anchor cable 5 is larger than or equal to the length of the anchor cable hole plus 300mm, namely, the length of the other end of the anchor cable 5 exposed out of the goaf 3 side of the narrow coal pillar 1 is ensured to be long enough, and the other end of the anchor cable 5 is ensured to be fixed better.
The length L of the extending part is not more than 500mm, namely, the length of one end, located on the reserved side of the gob-side entry driving 2, of the anchor cable 5 is not more than 500mm, so that the exposed anchor cable 5 is prevented from being too long, the cost of the anchor cable 5 is increased on the one hand, and the exposed anchor cable 5 is easy to hurt people due to too long length, and in actual situations, when the length of the exposed anchor cable 5 is more than 300mm, hydraulic tongs are required to be used for cutting off the anchor cable so as to meet the use requirement of the roadway section.
In this embodiment, when the anchoring agent 6 at one end of the anchor cable 5 is cleaned, the anchor cable is cleaned by using an air pick and a hammer.
Claims (5)
1. A support method for narrow coal pillars in gob-side entry driving is characterized by comprising the following steps:
1) determining the width a of the reserved narrow coal pillar (1) according to the earth surface movement rule;
2) tunneling in a section drift (4) of an adjacent section of the goaf (3), and supporting one side coal wall of a reserved narrow coal pillar (1) after tunneling is finished: firstly, drilling anchor cable holes one by one on the coal wall on one side of a reserved narrow coal pillar (1), enabling the anchor cable holes to penetrate through the reserved narrow coal pillar (1) along the width direction of the reserved narrow coal pillar (1) and extend to a gob-side entry driving roadway (2), enabling the length of an extending part to be L, then sending an anchoring agent (6) into the hole bottom of each anchor cable hole one by one, inserting one end of each anchor cable (5) into the hole bottom of each anchor cable hole, exposing the other end of each anchor cable (5) to one side of the corresponding narrow coal pillar (1), sequentially mounting a first tray (7) and a first lockset (8) on the narrow coal pillar, and then tensioning the narrow coal pillar and the first lockset to anchor the other end of each anchor cable (5);
3) after the stoping of the coal face (11) of the adjacent section of the goaf (3) is finished and the overlying strata of the coal face are stabilized, the coal is tunneled in the gob-side entry driving way (2), after the tunneling is finished, firstly, coal on one end of the anchor rope (5) on the gob-side entry driving side is removed one by one, so that one end of the anchor rope (5) is exposed out of the gob-side entry driving way (2), then, the anchoring agent (6) on one end of the anchor rope (5) is cleaned one by one, and finally, a second tray (9) and a second lock (10) are sequentially installed on one end of the anchor rope (5) one by one and are tensioned, so that the anchoring of one end of the anchor rope (5) is realized.
2. The method for supporting a narrow coal pillar in a gob-side entry driving according to claim 1, wherein the length L of the extended portion is not less than 300 mm.
3. A method for supporting narrow coal pillars in gob-side entry driving according to claim 2, wherein the length of the anchor cable (5) is more than or equal to the length of the anchor cable hole +300 mm.
4. A method for supporting a narrow coal pillar in a gob-side entry driving according to claim 3, wherein the length L of the extension is not more than 500 mm.
5. A method for supporting narrow coal pillars in gob-side entry driving according to claim 4, characterized in that, when cleaning the anchoring agent (6) at one end of the anchor rope (5), the cleaning is carried out by using a pneumatic pick and a hammer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011072364.2A CN112127926A (en) | 2020-10-09 | 2020-10-09 | Support method for narrow coal pillar in gob-side entry driving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011072364.2A CN112127926A (en) | 2020-10-09 | 2020-10-09 | Support method for narrow coal pillar in gob-side entry driving |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112127926A true CN112127926A (en) | 2020-12-25 |
Family
ID=73843901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011072364.2A Pending CN112127926A (en) | 2020-10-09 | 2020-10-09 | Support method for narrow coal pillar in gob-side entry driving |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112127926A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113685182A (en) * | 2021-08-10 | 2021-11-23 | 中国矿业大学 | Reuse method of retained anchor rods in gob-side entry driving coal pillar |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040161316A1 (en) * | 2003-02-19 | 2004-08-19 | F.M. Locotos Co., Inc. | Tubular mining bolt and method |
| CN103397905A (en) * | 2013-04-17 | 2013-11-20 | 唐建新 | System and method for achieving natural striding, falling and filling of coal beds, flexible roadway protection and complete gob-side entry retaining |
| CN207813624U (en) * | 2017-12-13 | 2018-09-04 | 陕西煤业化工技术研究院有限责任公司 | A kind of future small coal pillar comprehensive mechanical coal mining supporting construction |
| CN108590723A (en) * | 2018-05-24 | 2018-09-28 | 中煤能源研究院有限责任公司 | Gob side entry driving fender erosion control release is to drawing anchoring integral structure and construction method |
-
2020
- 2020-10-09 CN CN202011072364.2A patent/CN112127926A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040161316A1 (en) * | 2003-02-19 | 2004-08-19 | F.M. Locotos Co., Inc. | Tubular mining bolt and method |
| CN103397905A (en) * | 2013-04-17 | 2013-11-20 | 唐建新 | System and method for achieving natural striding, falling and filling of coal beds, flexible roadway protection and complete gob-side entry retaining |
| CN207813624U (en) * | 2017-12-13 | 2018-09-04 | 陕西煤业化工技术研究院有限责任公司 | A kind of future small coal pillar comprehensive mechanical coal mining supporting construction |
| CN108590723A (en) * | 2018-05-24 | 2018-09-28 | 中煤能源研究院有限责任公司 | Gob side entry driving fender erosion control release is to drawing anchoring integral structure and construction method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113685182A (en) * | 2021-08-10 | 2021-11-23 | 中国矿业大学 | Reuse method of retained anchor rods in gob-side entry driving coal pillar |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109681248B (en) | Advanced support method for grouting anchor cable | |
| CN110529144B (en) | Mixed type advanced support method for small-section mining roadway | |
| CN110259451A (en) | A kind of efficient mining methods of gently inclined medium thick orebody Pre-control roof | |
| US10202848B2 (en) | Method and system of coal mine roof stabilization | |
| CN103742176B (en) | A kind of pick anchor one unit | |
| CN102900449B (en) | Support method for underground goaf roof of coal mine | |
| CN103899342A (en) | Gob-side entrydriving coal pillar anchor cable through reinforcing method | |
| CN103775084A (en) | Construction technology of large-inclined-angle and large-mining-height fully-mechanized coal mining equipment passing through geological-structured fracture zone | |
| CN106968672B (en) | The cutting kerve method on precut shield top is carried out to ore body | |
| CN104405392B (en) | Three soft high seam tunnel jackings are kept on file anchor rete cord active support longwall top coal caving method | |
| CN103485795B (en) | Method for quickly tunneling mine roadway and consecutively timbering mine roadway | |
| CN112127926A (en) | Support method for narrow coal pillar in gob-side entry driving | |
| CN113605893B (en) | Control method for pre-filling full gob-side entry driving surrounding rock | |
| CN114592909A (en) | Downward layered access filling mining method for extremely-broken thick and large ore body | |
| CN110566238A (en) | Mud rock roof small coal pillar gob-side roadway supporting structure and method thereof | |
| CN105134212B (en) | A kind of method that three soft high seam tunnel ensures the rate of extraction along top driving longwall top coal caving | |
| CN1195149C (en) | Roof bolt protection and sectioned empty field method for phosphorate rock mining | |
| CN111550248B (en) | Pre-roof-protecting sublevel open-stoping subsequent filling mining method | |
| CN111042816B (en) | Mine section hole-cutting roadway-forming tunneling method | |
| CN111022050B (en) | Fully-closed blasting pressure relief and self-retained roadway method for grouting reconstruction of composite roof | |
| CN108952715B (en) | Gob-side entry driving top coal supporting and reinforcing method for inclined thick/extra-thick coal seam entry top | |
| CN110552731A (en) | top coal caving stoping roadway grouting anchor cable supporting structure and advanced supporting method thereof | |
| CN111828015A (en) | Roadway construction method | |
| CN102943674B (en) | Thin coal seam wide roadway digging gangue bag placement method under a kind of tight roof | |
| CN114215530B (en) | Rapid roadway digging method for directional hydraulic fracturing gob-side roadway of hard top plate |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201225 |
|
| RJ01 | Rejection of invention patent application after publication |