CN102787856A - Permanent supporting method of weak cementation soft rock roadway - Google Patents
Permanent supporting method of weak cementation soft rock roadway Download PDFInfo
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- CN102787856A CN102787856A CN2012102865327A CN201210286532A CN102787856A CN 102787856 A CN102787856 A CN 102787856A CN 2012102865327 A CN2012102865327 A CN 2012102865327A CN 201210286532 A CN201210286532 A CN 201210286532A CN 102787856 A CN102787856 A CN 102787856A
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- supporting
- anchor cable
- roadway
- soft rock
- anchor
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Abstract
The invention discloses a permanent supporting method of a weak cementation soft rock roadway; the roadway is excavated under advanced temporary supporting; after excavation, first anchor mesh spray joint supporting is carried out, and the supporting is called as primary supporting; anchor rope secondary supporting is carried out after the primary supporting; in the anchor rope secondary supporting, an anchor rope hole being 5m to 8m is punched on an arch top of the roadway vertical to a rock surface; a steel strand with the diameter being phi 12mm to 16mm is arranged in an anchor rope hole; the depth of an anchoring section of the steel strand needs to be more than 1m; reinforcing supporting is carried out after the anchor rope secondary supporting; and in the reinforcing supporting, U-shaped steel telescopic supports are adopted, and the spacing between the supports is 800mm. According to the permanent supporting method of the weak cementation soft rock roadway, a supporting effect of the weak cementation soft rock roadway is enhanced, the deformation of the weak cementation soft rock roadway is overcome, and the safe production of a coal mine is ensured.
Description
Technical field
The present invention relates to laneway support method.
Background technology
Roadway support is divided into temporary lining and permanent support.In the permanent support of colliery underworkings, generally adopt this method of anchor net spray Support Method to be applicable to the situation of common rock stratum at present.At present in colliery underworkings (especially crossdrift) driving; The situation of glued soft rock a little less than often running into the tunnel and passing is behind the roadway excavation as adopt common anchor net spray Support Method, just top board shows tangible distortion and increases phenomenon when supporting is accomplished one month; Deflection reaches more than the 500mm; Two help distortion also at 300mm simultaneously, rate of deformation reaches 11mm/d, has exceeded the ultimate deformation that general bolt support allowed; The pallet phenomenon of caving under bolt support, occurs simultaneously, be difficult to reach supporting effect.
Through analyzing, cause the reason of above-mentioned phenomenon to be, under certain stress of primary rock effect, because lithology weak; After the excavation release, large deformation takes place in country rock thereupon, and exerts pressure to supporting and protection structure, at this moment; Anchor pole is because rigidity is bigger, its receive elongation after the tension much smaller than country rock on every side to the nearly amount of moving of tunnel, cause the anchor pole phenomenon of caving in, the steel mesh reinforcement spray-up is the flexible support body simultaneously; Rigidity is much smaller than the rigidity of anchor pole pallet system, under the comprehensive function of drawing shear stress of pallet and spray-up junction, and steel mesh reinforcement elongation at yield in the spray-up, even fracture; Cause pallet and spray-up to break away from, and then make the spray-up system lose support, the forfeiture supporting effect.
Summary of the invention
For solve existing a little less than the problem of glued soft rock roadway support weak effect, the present invention propose a kind of a little less than the tunnel permanent support method of glued soft rock.
Technical scheme is, a kind of a little less than glued soft-rock tunnel permanent support method, it is characterized in that it may further comprise the steps:
The first step: it is under leading temporary lining, to excavate out the tunnel, at first carries out anchor net spray combined supporting behind the excavation, and this supporting is called and is once supporting;
Second step: carry out the anchor cable secondary supporting behind the once supporting, the anchor cable secondary supporting is that vault is beaten the anchor cable hole of 5-8m perpendicular to the direction of scar in the tunnel, and the steel strand of Φ 12-16mm are installed in the anchor cable hole, and the anchoring section degree of depth of steel strand should be greater than 1m;
The 3rd step: strengthen supporting behind the anchor cable secondary supporting, add strong supporting and adopt U shaped steel collapsible timbering, set spacing 800mm.
In order further to strengthen supporting effect, when the anchor cable secondary supporting, can install the reinforcing bar ladder beam at back simultaneously; Described reinforcing bar ladder beam is the truss that is welded with reinforcing bar.
The present invention has strengthened the supporting effect in the tunnel of weak glued soft rock, has overcome the distortion of weak glued soft-rock tunnel, has guaranteed Safety of Coal Mine Production.
The specific embodiment
According to the described technical scheme of summary of the invention, those skilled in the art can implement, and no longer repeat at this.
Claims (2)
1. glued soft-rock tunnel permanent support method a little less than a kind is characterized in that it may further comprise the steps:
The first step: it is under leading temporary lining, to excavate out the tunnel, at first carries out anchor net spray combined supporting behind the excavation, and this supporting is called and is once supporting;
Second step: carry out the anchor cable secondary supporting behind the once supporting, the anchor cable secondary supporting is that vault is beaten the anchor cable hole of 5-8m perpendicular to the direction of scar in the tunnel, and the steel strand of Φ 12-16mm are installed in the anchor cable hole, and the anchoring section degree of depth of steel strand should be greater than 1m;
The 3rd step: strengthen supporting behind the anchor cable secondary supporting, add strong supporting and adopt U shaped steel collapsible timbering, set spacing 800mm.
2. glued soft-rock tunnel permanent support method is characterized in that a little less than as claimed in claim 1, when the anchor cable secondary supporting, installs the reinforcing bar ladder beam at back simultaneously; Described reinforcing bar ladder beam is the truss that is welded with reinforcing bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102865327A CN102787856A (en) | 2012-08-13 | 2012-08-13 | Permanent supporting method of weak cementation soft rock roadway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102865327A CN102787856A (en) | 2012-08-13 | 2012-08-13 | Permanent supporting method of weak cementation soft rock roadway |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102787856A true CN102787856A (en) | 2012-11-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102865327A Pending CN102787856A (en) | 2012-08-13 | 2012-08-13 | Permanent supporting method of weak cementation soft rock roadway |
Country Status (1)
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| CN (1) | CN102787856A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507923A (en) * | 2015-12-29 | 2016-04-20 | 大同煤矿集团有限责任公司 | Bolting-wire mesh-shotcreting support and bolt-cable coupling support integrated supporting method for large-span chamber |
| CN112943264A (en) * | 2021-02-19 | 2021-06-11 | 国家能源集团宁夏煤业有限责任公司 | Construction method for fully-mechanized mining face retraction channel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3820700A1 (en) * | 1988-06-18 | 1989-12-21 | Ruhrkohle Ag | Compound anchor support system |
| JPH08165895A (en) * | 1994-12-13 | 1996-06-25 | Shigeki Nagatomo | Excavating method for large-cross section tunnel |
| CN1693670A (en) * | 2005-05-19 | 2005-11-09 | 中国矿业大学 | Three-anchor coupling supporting method for high stress tunnel break wall rock |
| CN101476472A (en) * | 2009-01-16 | 2009-07-08 | 北京工业大学 | Weak-gluing easy-weathering ravelly ground tunnel surrounding rock control method |
-
2012
- 2012-08-13 CN CN2012102865327A patent/CN102787856A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3820700A1 (en) * | 1988-06-18 | 1989-12-21 | Ruhrkohle Ag | Compound anchor support system |
| JPH08165895A (en) * | 1994-12-13 | 1996-06-25 | Shigeki Nagatomo | Excavating method for large-cross section tunnel |
| CN1693670A (en) * | 2005-05-19 | 2005-11-09 | 中国矿业大学 | Three-anchor coupling supporting method for high stress tunnel break wall rock |
| CN101476472A (en) * | 2009-01-16 | 2009-07-08 | 北京工业大学 | Weak-gluing easy-weathering ravelly ground tunnel surrounding rock control method |
Non-Patent Citations (2)
| Title |
|---|
| 亓荣强等: "弱胶结软岩巷道支护实践与合理支护形式探讨", 《采矿技术》, vol. 11, no. 1, 31 January 2011 (2011-01-31) * |
| 王玉生: "软岩巷道的支护设计与施工探讨", 《煤炭工程》, no. 04, 15 April 2008 (2008-04-15) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507923A (en) * | 2015-12-29 | 2016-04-20 | 大同煤矿集团有限责任公司 | Bolting-wire mesh-shotcreting support and bolt-cable coupling support integrated supporting method for large-span chamber |
| CN112943264A (en) * | 2021-02-19 | 2021-06-11 | 国家能源集团宁夏煤业有限责任公司 | Construction method for fully-mechanized mining face retraction channel |
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Application publication date: 20121121 |