CN101235720A - Excitated gap decompressed soft rock laneway support technology - Google Patents
Excitated gap decompressed soft rock laneway support technology Download PDFInfo
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- CN101235720A CN101235720A CNA2008100821667A CN200810082166A CN101235720A CN 101235720 A CN101235720 A CN 101235720A CN A2008100821667 A CNA2008100821667 A CN A2008100821667A CN 200810082166 A CN200810082166 A CN 200810082166A CN 101235720 A CN101235720 A CN 101235720A
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Abstract
The invention relates to the technical field of geological and mining, which particularly relates to a support technology for preventing coal mine tunnel from deforming and collapsing. The technique comprises adopting a bolt-grouting support, placing a grouting bolt in roadway surrounding rock, injecting cement grouting with pressure, arranging a cement spraying layer which utilizes a cable wire to be a bone to be a sealing layer, and enlarging wall rock crack through an artificial mode through adopting a gap shocking decompressing technique before employing bolt-grouting support. The support technology aims at incomplete growth of cracks and cleavage faces of loose and soft rock bodies, which adopts measures to increase weak planes in surrounding rocks to improve void fraction, and the technique is beneficial for releasing primary rock stress and leading the line where grouting slurry flows to be smooth, thereby achieving the purposes of releasing internal stress in surrounding rocks, improving gluing range of surrounding rocks, and stabilizing surrounding rocks, compared with the prior art, the support technology has more stable support effect.
Description
Technical field: the present invention relates to ore deposit, ground technical field, especially a kind of support technology that prevents coal mine roadway distortion slump.
Background technology: along with the expansion of coal mining scope, mining depth constantly increases, mining conditions is more and more difficult, and the stack pressure that weak rock coal self expands and brings to roadway support under especially big buried depth, complicated structure and the mining induced stress is the difficult problem of puzzlement colliery tunnel support always.Because the difference of the free speed of these pressure, the size and Orientation difference of power, therefore be when not waiting, uneven stack pressure makes up.Roadway support can be suffered to destroy repeatedly under the effect of this uneven stack pressure, and conventional support technology is difficult to guarantee the stable of tunnel.The roadway support instability influences the safety in production during the mine construction, bring potential safety hazard also can for later normal use.
Along with the invention and the development of anchor spray technique, mid-term in last century, the U.S., Australia were with suspention beam, compound beam, the theoretical support system that proposes based on anchor pole of built-up arch.Big coal countries such as Russia, Poland, Turkey still adopt dissimilar metallic supports to handle the supporting problem in tunnel so far.
At present, domestic on the basis of drawing foreign technology, to the roadway support under big buried depth, tectonic stress, mining pressure and " weak rocks, coal body " self swelling stress, mainly adopt two kinds of support patterns: a kind of is the composite support technology of whitewashing again behind totally-enclosed canopy of big model U shaped steel and the frame canopy; Another kind is that high strength anchor bar adds anchor cable and adds anchor net spray composite support technology; Also once attempted macroplate and net sticks up support technology.These support technologies one are to solve the stable problem of present difficult roadway support well, the 2nd, and construction is complicated, roadway support cost height, repairs just more difficult after roadway support destroys again." weak rocks, coal body " support technology of latest domestic development is the method that adopts bolt grouting, utilize grouted anchor bar in weak rocks, coal body, to inject the slurries that have pressure, improve the intensity of coal and rock self, obtain effect preferably, but, still exist the supporting effect problem of unstable because the slurries pressure that injects in rock, the coal body is difficult to lasting stability.Publication number is that CN1963150A, application number are that 200610162650.1 patent application discloses a kind of Weak rock coal supporting technology of superimposed stress of slow release of pressure-stabilizing gluing of tough blinding course, this technology is inserted grouted anchor bar in roadway surrounding rock, the coal body, injection has the cement grout of pressure, is the cement spray-up of footpath bone with the wire rope in the tunnel surface arrangement.This method can be to big buried depth, be subjected to the tunnel under tectonic stress, mining pressure and " weak rocks, coal body " self the swelling stress influence to play support action preferably.
On the basis of aforementioned patent applications, the present invention further improves, and makes supporting effect more stable.
Summary of the invention: the present invention by the following technical solutions: excitated gap decompressed soft rock laneway support technology, adopt bolt-grouting support, grouted anchor bar is inserted in the roadway surrounding rock, injection has the cement grout of pressure, the tunnel surface arrangement with the wire rope be the cement spray-up of footpath bone as seal, it is characterized in that, before implementing bolt-grouting support, adopt and swash crack pressure release technology, promptly wall-rock crack is enlarged by manual type.
It is incomplete at the crack and the cleavage surface development of soft rock mass swashing the crack technology, take the plane of weakness in the corresponding measure increase country rock and improve its voidage, the current through line that is beneficial to the release of the stress of primary rock and grouting serous fluid is unobstructed, thereby reach the glued scope of country rock after discharging the country rock internal stress and improving slip casting, stablize the purpose of country rock.The key link of bolt-grouting support technology be exactly by in wall-rock crack, inject can glued fractured rock slurries, realize reinforcement, thereby the crack and the effect that cleavage surface is excited of rock is good more in practice to the country rock body, the cementing strength of country rock will be high more.
It is pressure release that another of sharp crack mainly acts on.General roadway support can only partly have higher supporting role to wall rock loosening, is difficult to support for the retention stress in the country rock.Under the equilibrium state that the country rock secondary state of stress begins to take shape, for keeping stability of the roadway, require to large extent the stress in the country rock body to be discharged in the supporting later stage, initiatively pressure release is just very necessary therefore to take certain measure.The transmission of rock mass internal stress need be certain the path, and the crack in the rock mass, this approach of stress flow warp just, in general, corresponding crack is abundant more, stress forfeiture just fast more.
Therefore, the more existing support technology supporting effect of the present invention is more stable.
Description of drawings: accompanying drawing is a roadway support section structure schematic diagram of the present invention.Wherein, 1 grouted anchor bar, 2 drift sections, 3 base angle foundation pits, 4 seals.
The specific embodiment: the invention will be further described below in conjunction with accompanying drawing.
Among the embodiment, during the tunnel, deep-cut the base angle at excavation, the vibrations of blowing out in base angle foundation pit 3 swash the crack, and base angle foundation pit 3 is sprayed concrete are replaced.It is multiple to excite the mode of wall-rock crack to have, and the embodiment of the invention adopts and deep-cuts the basis, base angle, blows out the method for vibrations in base angle foundation pit 3.This mode easy construction, vibrations, can be played and swash the crack effect preferably to the roadway surrounding rock transmission by the base angle.Deep-cutting the base angle is the better mode in a kind of pressure release and sharp crack, because the base angle is positioned at the crosspoint in tunnel, stress is concentrated, and with helping the concentrated release of surrouding rock stress herein after hollowing out, in the process of stress release, wall-rock crack enlarges naturally.In addition, be chosen in the base angle and blow out, can also prevent that the top, tunnel from directly being shaken the collapse accident that causes.
Claims (2)
1, excitated gap decompressed soft rock laneway support technology, adopt bolt-grouting support, grouted anchor bar (1) is inserted in the roadway surrounding rock, injection has the cement grout of pressure, the tunnel surface arrangement with the wire rope be the cement spray-up of footpath bone as seal (4), it is characterized in that, before implementing bolt-grouting support, adopt and swash crack pressure release technology, promptly wall-rock crack is enlarged by manual type.
2, excitated gap decompressed soft rock laneway support technology according to claim 1 is characterized in that, during the tunnel, deep-cuts the base angle at excavation, and the vibrations of blowing out in base angle foundation pit (3) swash the crack, and base angle foundation pit (3) is sprayed concrete is replaced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100821667A CN101235720A (en) | 2008-02-29 | 2008-02-29 | Excitated gap decompressed soft rock laneway support technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100821667A CN101235720A (en) | 2008-02-29 | 2008-02-29 | Excitated gap decompressed soft rock laneway support technology |
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| Publication Number | Publication Date |
|---|---|
| CN101235720A true CN101235720A (en) | 2008-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100821667A Pending CN101235720A (en) | 2008-02-29 | 2008-02-29 | Excitated gap decompressed soft rock laneway support technology |
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| CN (1) | CN101235720A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437770A (en) * | 2013-06-25 | 2013-12-11 | 淮北市平远软岩支护工程技术有限公司 | Supporting method for excitation gap pressure relief soft rock roadway |
| CN106246202A (en) * | 2016-11-01 | 2016-12-21 | 何双龙 | A kind of loose weak country rock tunnel combined bolting and shotcrete structure and construction method |
| CN107035387A (en) * | 2016-12-12 | 2017-08-11 | 贵州理工学院 | A kind of roadway surrounding rock control method under the influence of strong dynamic pressure |
| CN113202500A (en) * | 2021-04-06 | 2021-08-03 | 淮北市平远软岩支护工程技术有限公司 | Initial pressure reduction and clearance support method and equipment based on rock burst roadway |
-
2008
- 2008-02-29 CN CNA2008100821667A patent/CN101235720A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437770A (en) * | 2013-06-25 | 2013-12-11 | 淮北市平远软岩支护工程技术有限公司 | Supporting method for excitation gap pressure relief soft rock roadway |
| CN106246202A (en) * | 2016-11-01 | 2016-12-21 | 何双龙 | A kind of loose weak country rock tunnel combined bolting and shotcrete structure and construction method |
| CN107035387A (en) * | 2016-12-12 | 2017-08-11 | 贵州理工学院 | A kind of roadway surrounding rock control method under the influence of strong dynamic pressure |
| CN113202500A (en) * | 2021-04-06 | 2021-08-03 | 淮北市平远软岩支护工程技术有限公司 | Initial pressure reduction and clearance support method and equipment based on rock burst roadway |
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Open date: 20080806 |