CN202360105U

CN202360105U - Gap-exciting pressure-relief soft rock roadway supporting structure

Info

Publication number: CN202360105U
Application number: CN2011204649319U
Authority: CN
Inventors: 李明远
Original assignee: HUAIBEI PINGYUAN RUANYANZHIHUGONGCHENG Co Ltd
Current assignee: HUAIBEI PINGYUAN RUANYANZHIHUGONGCHENG Co Ltd
Priority date: 2011-11-22
Filing date: 2011-11-22
Publication date: 2012-08-01
Anticipated expiration: 2021-11-22

Abstract

The utility model discloses a gap-exciting pressure-relief soft rock roadway supporting structure comprising a roadway, wherein a concrete spray layer with steel wire ropes as radial ribs as a seal layer is arranged on the inner surface of the roadway; a grouting anchor rod is arranged in the surrounding rock at the periphery of the roadway and cement grout with pressure is poured into the surrounding rock to solidify the anchor rod; a fundamental pit is formed on the footing of the roadway and an explosive is mounted in the pit; the explosive is mounted in the fundamental pit of the footing of the roadway; and after the explosive is blown out to vibrate and excite a gap, concrete is sprayed into the fundamental pit of the footing for replacement. The gap-exciting pressure-relief soft rock roadway supporting structure is characterized in that the footing is deeply dug when the roadway is dug, and the explosive is placed in the fundamental pit of the footing and is blown out to excite the gap; and such a manner is simple and convenient for construction; vibration is transferred to the surrounding rock of the roadway from the footing, thereby achieving good gap exciting effect. Deep digging of the footing is a good pressure relief manner; as the footing is located at the cross point of the roadway and the stress is concentrated, the footing is hollowed out so that the stress of the surrounding rock can be intensively released; and in the stress release process, the gap of the surrounding rock is naturally expanded.

Description

A kind of excitated gap decompressed soft rock laneway support structure

Technical field:

The utility model relates to ore deposit, ground technical field, relates in particular to a kind of excitated gap decompressed soft rock laneway support structure.

Background technology:

Expansion along with the coal mining scope; Mining depth constantly increases; The mining conditions more and more difficult, 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, therefore the size and Orientation difference of power 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.Roadway support is unstable, influence the safety in production during the mine construction, also can bring potential safety hazard to 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 the theoretical support system that is the main body with the anchor pole of proposing of hanging beam, compound beam, 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 of whitewashing technology 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 well to solve the stable problem of present difficult roadway support, the 2nd, and construction is complicated, the roadway support cost is high, 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 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; The cement grout that injection has pressure solidifies, and surface arrangement is the cement spray-up of footpath bone with the wire rope in the tunnel.This method can be to big buried depth, receive the tunnel under tectonic stress, mining induced stress and " weak rocks, coal body " self the swelling stress influence to play support action preferably.

It is incomplete to soft rock mass moral crack and cleavage surface development swashing the crack technology; Take the plane of weakness in the corresponding measure increase country rock and improve its voidage; The current through line of release and grouting serous fluid that is beneficial to the stress of primary rock 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 through 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 discharge than the stress in the country rock body of limits in the supporting later stage, initiatively pressure release is just very necessary therefore to take certain measure.The transmission of rock mass internal stress needs certain path, and the crack in the rock mass, this approach of stress flow warp just, and generally speaking, corresponding crack is abundant more, stress forfeiture just fast more.

Therefore intend on the basis of aforementioned patent applications, do further improvement, make supporting effect more stable in conjunction with sharp crack technology.

The utility model content:

The purpose of the utility model just provides a kind of excitated gap decompressed soft rock laneway support structure; Solve the expansion of coal mining scope; Mining depth constantly increases; The mining conditions more and more difficult, 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, therefore the size and Orientation difference of power 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.Roadway support is unstable, influence the safety in production during the mine construction, also can bring the problem of potential safety hazard to later normal use.

The technical scheme that the utility model adopts is:

A kind of excitated gap decompressed soft rock laneway support structure comprises the tunnel, it is characterized in that: the tunnel inner surface arrange with the wire rope be the cement spray-up of footpath bone as seal, insert grouted anchor bar in the peripheral country rock in tunnel, and inject the cement grout that has pressure and solidify; The tunnel footing has foundation pit, after the installation explosive is blown out the sharp crack of vibrations in the hole, the footing foundation pit is sprayed concrete replace.

Displacement is meant rock in the foundation pit behind the sharp crack is gone out clearly, fills with concrete; Solidify in the sharp crack that perhaps will have the interior rock of cement grout injection foundation pit of pressure.

Compared with prior art, the beneficial effect of the utility model is:

The utility model is through during the tunnel, deep-cutting footing at excavation, and in the footing foundation pit, places explosive in order to blowing out the structure that swashs the crack, this mode easy construction, and vibrations, can be played and swash the crack effect preferably to the roadway surrounding rock transmission by footing.Deep-cutting footing is a kind of fine mode of pressure release, because footing is positioned at the crosspoint in tunnel, stress is concentrated, and with the concentrated release that helps surrouding rock stress here after hollowing out, in the process of stress release, wall-rock crack enlarges naturally.In addition, be chosen in footing and blow out, can also prevent that the top, tunnel directly receives vibrations to cause collapse accident.

Description of drawings:

Accompanying drawing 1 is the utility model structural representation.

The specific embodiment:

Below in conjunction with accompanying drawing, the utility model is done further explain through embodiment:

A kind of excitated gap decompressed soft rock laneway support structure comprises tunnel 1: tunnel 1 inner surface arrange with the wire rope be the cement spray-up 2 of footpath bone as seal, insert grouted anchor bar 3 in the peripheral country rock in tunnel 1, and inject the cement grout that has pressure and solidify; Tunnel 1 footing has foundation pit 5, and explosive 4 is installed in the hole, after the vibrations of blowing out swash the crack, footing foundation pit 5 is sprayed concrete replace.

The foregoing description is merely the preferred implementation of the utility model, and in addition, the utility model can also have other implementations.Need to prove that under the prerequisite that does not break away from the utility model design, any conspicuous improvement and modification all should fall within the protection domain of the utility model.

Claims

1. an excitated gap decompressed soft rock laneway support structure comprises the tunnel, it is characterized in that: the tunnel inner surface arrange with the wire rope be the cement spray-up of footpath bone as seal, insert grouted anchor bar in the peripheral country rock in tunnel, and inject the cement grout that has pressure and solidify; The tunnel footing has foundation pit, after the installation explosive is blown out the sharp crack of vibrations in the hole, the footing foundation pit is sprayed concrete replace.