CN109139020A - A kind of underground chamber quiet pop in rock burst area digs branch's unloading method - Google Patents

A kind of underground chamber quiet pop in rock burst area digs branch's unloading method Download PDF

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Publication number
CN109139020A
CN109139020A CN201811062439.1A CN201811062439A CN109139020A CN 109139020 A CN109139020 A CN 109139020A CN 201811062439 A CN201811062439 A CN 201811062439A CN 109139020 A CN109139020 A CN 109139020A
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rock
eye
horizontal
hole
quiet
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CN109139020B (en
Inventor
樊军伟
杨仕教
彭成
陈文昭
龙慧
江俊设
胡萍
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South China University of Technology SCUT
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South China University of Technology SCUT
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining 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
    • E21D11/107Reinforcing elements therefor; Holders for the reinforcing elements
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/006Lining anchored in the rock
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal
    • E21D11/15Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
    • E21D11/152Laggings made of grids or nettings
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/001Improving soil or rock, e.g. by freezing; Injections

Abstract

The invention discloses a kind of quiet pop of rock burst area underground chamber to dig branch's unloading method, intensive cone cut eye, horizontal blank eye, horizontal reliever and the horizontal perimeter eye different to front of tunnel heading construction depth is as first step stress relieving process, by high-ground stress to the rock mass interior shifting of different depth;Then the rock static fracturing agents of a cyclic advance are perfused toward cone cut eye, horizontal reliever and horizontal perimeter eye step by step, the bulbs of pressure of the 30~80MPa or more generated by catalase agent hydration reaction itself are excavated rock mass and are pushed ahead, in this role release the local stress substep near face, in digging process rock mass to be broken be it is shockproof, noiseless, without slungshot and nonhazardous in the case where safe Static crushing, meet the rock bursts control arguments such as current short drilling depth, multi-cycle, weak blast, few disturbance, control Smooth Blasting Effects.Eliminate or reducing rock excavation causes the energy accumulation of stresses re-distribution horizontal, has accomplished not only to weaken Surrounding Rock Strength but also has not damaged country rock excessively.

Description

A kind of underground chamber quiet pop in rock burst area digs branch's unloading method
Technical field
The present invention relates to geotechnical engineering fields, and in particular to a kind of rock burst area quiet pop of underground chamber digs off-load side of branch Method.
Background technique
Due to the stress of country rock during lithology is hard complete or underground engineering is excavated in more complete High Ground Stress Areas Redistribution cause the elastic strain energy of rock mass accumulated inside discharge suddenly generate sliver disperse out at a terrific speed into chamber Come, referred to as rock burst the phenomenon that the simultaneous huge sound.
Rockburst Problem caused by excavating in the hard rockmass in high-ground stress area will be 21 century China's underground engineering hair The significant challenge that developable surface faces.During Underground Engineering Excavation, rock burst is to react most strong one in the various unstable phenomenons of country rock Kind, it is a big geological disaster of underground construction.It is sudden due to it, the consequence of strong rock burst usually bringing on a disaster property: make Damaged at casualties, construction equipment, increase scrapping for investment, influence construction speed or even underground engineering etc..Its not only prestige The life security of people is coerced, or even brings huge psychological burden and stress to construction personnel, is brought extremely severe Economic and social benefits.
It is generally acknowledged that rock burst occur lithology is hard, in brittleness, structural integrity or basic complete rock mass.The mechanics of rock mass Property is the internal factor that rock burst occurs for rock mass, and rock more rigid structure is more complete, and under stress, the elasticity of storage is answered Change can be bigger.The elastic strain energy that rock mass stores in deformation process after excavation not only meets the energy that rock mass consumes in destructive process Amount, moreover it is possible to extra kinetic energy is provided for rock it is made to be converted into kinetic energy launch away the sillar of removing, formation rock burst.
Correspondingly, rock-burst prevention measure mainly has following several respects to underground chamber in the construction process:
(1) improve country rock physical and mechanical property.The common practice has water spray or water filling: 1. water spray can be such that rock mass softens, Rigidity reduces, and deformation increases, and the energy put aside in rock mass can be released gently, thus caused by reducing because of high-ground stress Breakoff phenomenon.Cold water is often such as sprayed on face (excavation face) and hole wall, surface layer country rock can be reduced to a certain extent Intensity;2. using the water filling of advance borehole high-pressure uniform rock burst can be prevented and treated by the effect of three aspects: first is that can discharge Strain energy, and maximum tangential stress is shifted to deep;Second is that the wedge action of high pressure water injection can soften, to reduce rock mass strong Degree;Third is that high pressure water injection produces new separation fracture, and makes preexisting crack continue to extend, to reduce rock mass storage strain energy Ability.
(2) improve surrouding rock stress condition.In the construction process, Blasting Excavation uses short drilling depth, multi-cycle;Weak blast is few Disturbance, control Smooth Blasting Effects, to reduce country rock skin stress concentration phenomenon.Slightly, medium rock burst section uses entirely as far as possible Section once excavates molding construction method, to reduce the disturbance to country rock.The strong above earthquake intensity rock blasting region, when necessary The method that partial excavation can be used to reduce the extent of the destruction of rock burst, but should reduce blasting vibration triggering rock to the greatest extent in construction A possibility that quick-fried;The methods of advance borehole stress relieving, standing or shock blasting are taken, rock mass stress is reduced, energy It is gradually discharged before excavation.
(3) country rock is reinforced.Use different Reinforcement Measures driven bearings by due to rock burst the rock burst of different earthquake intensitys Adverse consequences produced by occurring.For weak rock burst, implementable full*.face smooth blasting is excavated, and m esh-hanging sprayed concrete initial stage is arranged Supporting;For medium rock burst, implement full*.face smooth blasting excavation, simultaneously radial system is arranged in m esh-hanging sprayed concrete preliminary bracing Anchor pole;For the strong above earthquake intensity rock burst section, takes more and deepen encryption system anchor pole, and cushioning plate;Hang integral net;Grid steel frame The measures such as support.
There is also deficiencies for current existing rock-burst prevention measure, are mainly shown as:
Water spray is typically only capable to soak country rock surface layer and is difficult to be deep into inside rock mass that reduce country rock strong on face or cave wall Degree, sphere of action are limited;
Drilling high pressure water injection has both the effect of softening country rock and advanced stress release, however crack is due to being infused in rock mass The lubricating action of water can trigger again causes " microseism ", does not as a result often have due softening shoulder bed effects.In High Ground Stress Areas, It is closed stress and may be released in a manner of new rock burst after water filling.Height of the validity of pouring water into borehole in solid rock The area Di Ying is to be worth discussion.
Currently, many scholars recommend the generation for reducing rock burst with the mode of partial excavation, but scene actually shows that increase is opened The number of digging is not fully advantageous, and multiple Blasting Excavation just mostly once encounters the chance of rock burst, and multiple power Blasting Excavation is even Failure by shear rock burst can be induced.
It reinforces country rock and only resists bring negative consequence after rock burst occurs from passively angle, for strong above Rock burst passes through merely strengthening supporting rigidity and is difficult to eliminate its adverse consequences.
Summary of the invention
In view of various unfavorable factors of the above rock-burst prevention measure, the present invention provides a kind of rock burst area underground chamber is quiet quick-fried Excavate branch's unloading method.
To achieve the above object, the technical scheme adopted by the invention is as follows:
A kind of underground chamber quiet pop in rock burst area digs branch's unloading method, includes the following steps:
S1, according to lithology, the hardness of rock, the brittleness of rock, rock mass structure, crustal stress situation and engineering characteristic etc. Rock burst proneness country rock region is drawn a circle to approve, and assesses its rockburst intensity and issuable adverse consequences;
S2, when face excavation is advanced to certain distance before rock burst generation area on face subregion located level periphery Eye, horizontal reliever, horizontal blank eye and cone cut eye, and predetermined hole location drills on face with rock drill;Except horizontal blank Other outer hole locations of eye are quiet blast hole;
S3, allotment static fracturing agents, are perfused the cone cut eye of 1.05 times of cyclic advances and wait tapered zone rock mass quiet quick-fried;
S4, allotment static fracturing agents, are perfused the reliever of 1 times of cyclic advance and wait rock mass quiet quick-fried;
S5, allotment static fracturing agents are perfused the periphery hole of 1 times of cyclic advance and wait the quiet quick-fried formation underground chamber of rock mass Peripheral profile;
S6, cooperation mini-excavator complete the adit digging an of cyclic advance and operation of slagging tap;
S7, the cone cut eye for extending 1.05 times of cyclic advances through rock drill and 1 times of cyclic advance horizontal blank eye, level are auxiliary Help eye, horizontal perimeter eye;
S8, repetition step 3~step 7 carry out the operation of next circulation until adit digging supporting safety rock burst area Certain distance.
Certain distance in the step S2 is usually 1 times of hole across setting the close of different depth in area face forward Collect horizontal periphery hole, horizontal reliever, horizontal blank eye and cone cut eye, cone cut eye is preferably arranged in underground chamber face Near central regions, horizontal reliever are arranged in the intermediate region of face upper conical snubber and horizontal perimeter eye;Horizontal week The depth of side eye be 1 times of hole across, the depth of reliever be 2 times of holes across;Snubber use cone cut eye, when hole across it is larger when Using compound taper snubber, increase free face to improve first quiet quick-fried efficiency, snubber interior zone is preferably arranged on face Isometric several horizontal blank eyes with reliever, empty eye diameter is about 100mm;
Quiet quick-fried bore diameter is 30~90mm, and pitch of holes is determined according to lithology, generally 10~40cm, primary quiet quick-fried rock mass When needing multiple rows of hole, array pitch is 0.2~0.4m.Predetermined hole location other hole locations in addition to horizontal blank eye are used as quiet blast hole, quiet blast hole The hole of chemically fragmenting agent is as perfused.
Further, the depth of cracking agent is once perfused by horizontal reliever and horizontal perimeter eye for a cyclic advance Degree control, it is first quiet quick-fried to avoid cone cut eyeground portion rock mass when each cyclic advance excavates generally within 2.5m The depth of clamping action snubber is preferably 1.05 times of cyclic advances.It can also be comprehensive to determine according to the actual conditions of rock mass to be handled Level can be used with the mode cloth hole vertically combined in aperture, hole depth, pitch-row and array pitch when necessary.Paying attention to will be in hole before powder charge Dust or ponding clean out.
Further, the step S3, step S4, static fracturing agents described in step S5 are pressed by water and noiseless swelling agent The ratio of mass ratio 1:3 mixes gained;
When allotment, first measured water is poured into bucket, then noiseless swelling agent is poured into, start handheld stirring machine immediately It mixes to uniform, mixing time is generally 40~60s.When small sized applications manually stir, rubber gloves is worn, paste is firmly mixed Slurry is stand-by.The noiseless swelling agent slurry being stirred need to be finished in order to avoid lost flowability within 10 minutes.
Further, the static fracturing agents in use,
When there are lateral aperture or upward hole, the ratio for being 0.25~0.28 according to water ash mass ratio is by static(al) swelling agent tune It is filled in hole with being in clay shape with hand rubbing at item, then smashes densification reality with waddy;
It is lower directly to topple over into hole, and plugged and pounded with thick iron wire and perfusion leakiness is avoided to reduce crushing effect;Perfusion is extremely When near aperture should there are the surplus capacity of 5~10mm or so in case waste material;
Static fracturing agents should be perfused to bottom hole by cone cut eye and guarantee to be perfused closely knit, horizontal reliever and level Before periphery hole perfusion strength cork of the diameter slightly larger than quiet quick-fried bore diameter should be squeezed into away from 1 times of face circulation in hole Drilling depth, the natural spalling after 8~12 hours of the static fracturing agents of perfusion in the process should be constantly to part cracking The watering of rock mass surface makes swelling agent sustained response;Cooperation excavator will be crushed in time after the rock of previous step is quiet quick-fried complete Sillar is shoveled from original position, provides more free faces for subsequent quiet quick-fried process;Cone cut eye, water when being perfused for security consideration substep Top eyelet is perfused after face lower part eyelet should first be perfused in the static fracturing agents pouring squence of flat reliever and horizontal perimeter eye.
Further, rock burst area a distance described in the step S8 be 1 times hole across.
The invention has the following advantages:
1. the static expanding pressure for crossing rock expansion agent excavates rock mass, the dust of generation is few, noise is small, economy is strong;② Heavy mechanical equipment is not used in work progress, it is stronger to the adaptability of underground engineering small space;3. construction safety is easy to be fast It is prompt, equipment operation is simple, construction efficiency is high, crushing effect is good, without power explosion, not to the competency profiling of construction personnel It is high;4. rock matter applicability is extensive, the broken excavation processing of various types rock mass can be suitably used for;5. work progress disturbs surrounding enviroment It is dynamic smaller, it was not only able to achieve reduction country rock to the greatest extent, but also excessively damage country rock does not cause rock fall roof fall, farthest Meet the theory of new Austrian method for tunnel construction, while new rock burst will not be induced because of power explosion again and generated;6. passing through The different intensive drilling of depth and the quiet quick-fried gradually stress relieving for excavating realization different depth rock mass and local rock mass step by step, Meet the rock bursts control arguments such as current short drilling depth, multi-cycle, weak blast, few disturbance, control Smooth Blasting Effects;7. intensive deep hole Being segmented the quiet quick-fried process of substep rock mass is both the process of rock excavation and the process of stress relieving, and stress relieving process does not influence cave Propulsion is excavated forward in room;8. the present invention is suitable for the multiple types underground structure rocks such as horizontal direction, inclined direction and vertical direction The substep off-load of body engineering, which is excavated, to be promoted;9. common catalase agent currently on the market belongs to static noiseless chemically fragmenting agent, It is shockproof, noiseless, without Toxic generate, be conducive to environmental protection.
Detailed description of the invention
Fig. 1 is circular cross section chamber front view
Fig. 2 is circular cross section chamber skiagraph
In figure: 1- cone cut eye;The horizontal reliever of 2-;3- horizontal perimeter eye;4- cone cut area horizontal blank eye;5- Lower chamber peripheral profile line;6- cork.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention Protection scope.
The embodiment of the invention provides a kind of quiet pop of rock burst area underground chamber to dig branch's unloading method, including walks as follows It is rapid:
S1, according to lithology, the hardness of rock, the brittleness of rock, rock mass structure, crustal stress situation and engineering characteristic etc. Rock burst proneness country rock region is drawn a circle to approve, and assesses its rockburst intensity and issuable adverse consequences;
S2, when face excavate be advanced to rock burst generation area before about 1 times hole span from when, as shown in Fig. 1-Fig. 2, Horizontal perimeter eye, horizontal reliever, horizontal blank eye and the cone cut eye of different depth, horizontal week are set in area face forward The depth of side eye be 1 times of hole across, the depth of horizontal reliever be 2 times of holes across;Snubber uses cone cut eye, when hole is across larger The compound taper snubber of Shi Caiyong increases free face to improve first quiet quick-fried efficiency, on face inside snubber setting with it is auxiliary Several horizontal blank eyes that eye is isometric are helped, empty eye diameter is about 100mm;One cyclic advance is by horizontal reliever and horizontal perimeter eye Primary perfusion cracking agent it is deep-controlled, generally within 2.5m, on face each cyclic advance it is first quiet quick-fried when to keep away The depth for exempting from the clamping action snubber of cone cut eyeground portion rock mass is preferably 1.05 times of cyclic advances;Then it is being slapped with rock drill Predetermined hole location drilling on sub- face;Predetermined hole location other hole locations in addition to horizontal blank eye are quiet blast hole, and quiet blast hole is that chemistry is perfused The hole of cracking agent.
Quiet quick-fried bore diameter is 30~90mm, and pitch of holes is determined according to lithology, generally 10~40cm, primary quiet quick-fried rock mass When needing multiple rows of hole, array pitch is 0.2~0.4m;
S3, allotment static fracturing agents, are perfused the cone cut eye of 1.05 times of cyclic advances and wait tapered zone rock mass quiet quick-fried;
S4, allotment static fracturing agents, are perfused the reliever of 1 times of cyclic advance and wait rock mass quiet quick-fried;
S5, allotment static fracturing agents are perfused the periphery hole of 1 times of cyclic advance and wait the quiet quick-fried formation underground chamber of rock mass Peripheral profile;
S6, cooperation mini-excavator complete the adit digging an of cyclic advance and operation of slagging tap;
Horizontal blank eye, the level of S7, the cone cut eye for extending 1.05 times of cyclic advances through rock drill and 1 times of cyclic advance Periphery hole and horizontal reliever;
S8, repetition step 3~step 7 carry out the operation of next circulation until adit digging supporting safety rock burst area 1 times of hole span from.
In the present embodiment, the step S3, step S4, static fracturing agents described in step S5 are by water and noiseless swelling agent The ratio of 1:3 in mass ratio mixes gained;
When allotment, first measured water is poured into bucket, then noiseless swelling agent is poured into, start handheld stirring machine immediately It mixes to uniform, mixing time is generally 40~60s.When small sized applications manually stir, rubber gloves is worn, paste is firmly mixed Slurry is stand-by.The noiseless swelling agent slurry being stirred need to be finished in order to avoid lost flowability within 10 minutes;
In use, when there are lateral aperture or upward hole, the ratio for being 0.25~0.28 according to water ash mass ratio is by static(al) Cracking agent allotment is filled in hole in clay shape with hand rubbing at item, then smashes densification reality with waddy;
It is lower directly to topple over into hole, and plugged and pounded with thick iron wire and perfusion leakiness is avoided to reduce crushing effect;Perfusion is extremely When near aperture should there are the surplus capacity of 5~10mm or so in case waste material;
Static fracturing agents should be perfused to bottom hole by cone cut eye and guarantee to be perfused closely knit, horizontal reliever and level Strength it should squeeze into a diameter toward hole in front of periphery hole perfusion and be slightly larger than the cork of quiet quick-fried bore diameter and extremely followed away from 1 times of face Ring drilling depth, the natural spalling after 8~12 hours of the static fracturing agents of perfusion should constantly crack to part in the process Rock mass surface watering make swelling agent sustained response;Cooperation excavator will be broken in time after the rock of previous step is quiet quick-fried complete Detritus block is shoveled from original position, provides more free faces for subsequent quiet quick-fried process;Cone cut eye when being perfused for security consideration substep, Upper hole is perfused after face lower part eyelet should first be perfused in the static fracturing agents pouring squence of horizontal reliever and horizontal perimeter eye Eye.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase Mutually combination.

Claims (7)

1. a kind of underground chamber quiet pop in rock burst area digs branch's unloading method, which comprises the steps of:
S1, rock is drawn a circle to approve according to lithology, the hardness of rock, the brittleness of rock, rock mass structure, crustal stress situation and engineering characteristic Quick-fried tendentiousness country rock region, and assess its rockburst intensity and issuable adverse consequences;
S2, when face excavation is advanced to certain distance before rock burst generation area face subregion located level periphery hole, Horizontal reliever, horizontal blank eye and cone cut eye, and predetermined hole location drills on face with rock drill, in addition to horizontal blank eye Other hole locations are quiet blast hole;
S3, allotment static fracturing agents, are perfused the cone cut eye of 1.05 times of cyclic advances and wait tapered zone rock mass quiet quick-fried;
S4, allotment static fracturing agents, are perfused the horizontal reliever of 1 times of cyclic advance and wait rock mass quiet quick-fried;
S5, allotment static fracturing agents are perfused the horizontal perimeter eye of 1 times of cyclic advance and wait the quiet quick-fried formation underground chamber of rock mass Peripheral profile;
S6, cooperation mini-excavator complete the adit digging an of cyclic advance and operation of slagging tap;
S7, extend the cone cut eye of 1.05 times of cyclic advances and the horizontal blank eye of 1 times of cyclic advance, horizontal auxiliary through rock drill Eye, horizontal perimeter eye;
S8, repetition step 3~step 7 carries out the operation of next circulation until adit digging supporting safety rock burst area is certain Distance.
2. underground chamber quiet pop in a kind of rock burst area as described in claim 1 digs branch's unloading method, which is characterized in that described Certain distance in step S2 be 1 times of hole across.
3. underground chamber quiet pop in a kind of rock burst area as described in claim 1 digs branch's unloading method, which is characterized in that described In step S2,
Intensive horizontal perimeter eye, horizontal reliever, horizontal blank eye and the cone cut of different depth are set on face forwards Eye, cone cut eye are preferably arranged in underground chamber face near central regions, and it is upper conical that horizontal reliever is arranged in face The intermediate region of snubber and horizontal perimeter eye;The depth of horizontal perimeter eye is 1 times of hole across the depth of horizontal reliever is 2 times Hole across;Snubber uses cone cut eye, when hole across it is larger when use compound taper snubber, increase to improve first quiet quick-fried efficiency Add free face, snubber interior zone is preferably arranged and the isometric several horizontal blank eyes of reliever, horizontal blank eye diameter on face For 100mm;
Quiet quick-fried bore diameter is 30~90mm, and pitch of holes is determined according to lithology, generally 10~40cm, and primary quiet quick-fried rock mass needs When multiple rows of hole, array pitch is 0.2~0.4m.
4. underground chamber quiet pop in a kind of rock burst area as described in claim 1 digs branch's unloading method, which is characterized in that described A cyclic advance the deep-controlled of cracking agent is once perfused by horizontal reliever and horizontal perimeter eye, within 2.5m, the palm The first quiet quick-fried clamping action cone cut eye to avoid cone cut eyeground portion rock mass that each cyclic advance excavates on sub- face Depth be preferably 1.05 times of cyclic advances.
5. underground chamber quiet pop in a kind of rock burst area as described in claim 1 digs branch's unloading method, which is characterized in that described Step S3, step S4, static fracturing agents described in step S5 mix institute by the ratio of water and noiseless swelling agent 1:3 in mass ratio ?;
When allotment, first measured water is poured into bucket, then noiseless swelling agent is poured into, start immediately handheld stirring machine mix to Uniformly, mixing time is 40~60s, and the noiseless swelling agent slurry being stirred need to be finished in order to avoid losing flowing within 10 minutes Property.
6. underground chamber quiet pop in a kind of rock burst area as described in claim 1 digs branch's unloading method, which is characterized in that described Static fracturing agents in use,
When there are lateral aperture or upward hole, the allotment of noiseless swelling agent is in by the ratio for being 0.25~0.28 according to water ash mass ratio Clay shape is filled in hole with hand rubbing at item, then smashes densification reality with waddy;
It is lower directly to topple over into hole, and plugged and pounded with thick iron wire and perfusion leakiness is avoided to reduce crushing effect;It is perfused to aperture Nearby when should there are the surplus capacity of 5~10mm or so in case waste material;
For cone cut eye static fracturing agents should be perfused to bottom hole and guarantee to be perfused it is closely knit, reliever and periphery hole perfusion before Strength cork extremely away from face 1 times cyclic advance of the diameter slightly larger than quiet quick-fried bore diameter should be squeezed into hole, perfusion Static fracturing agents natural spalling after 8~12 hours should constantly be spilt to the rock mass surface of part cracking in the process Water makes swelling agent sustained response;Cooperation excavator in time shovels broken sillar from original after the rock of previous step is quiet quick-fried complete Position, provides more free faces for subsequent quiet quick-fried process;Cone cut eye when being perfused for security consideration substep, horizontal reliever and Top eyelet is perfused after face lower part eyelet should first be perfused in the static fracturing agents pouring squence of horizontal perimeter eye.
7. underground chamber quiet pop in a kind of rock burst area as described in claim 1 digs branch's unloading method, which is characterized in that described Rock burst area a distance described in step S8 be 1 times of hole across.
CN201811062439.1A 2018-09-12 2018-09-12 Static blasting excavation subsection unloading method for underground chamber in rock burst area Active CN109139020B (en)

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