CN109057813A - A method of pit shaft rock burst is prevented and treated using high-pressure water jet - Google Patents

A method of pit shaft rock burst is prevented and treated using high-pressure water jet Download PDF

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Publication number
CN109057813A
CN109057813A CN201810743750.6A CN201810743750A CN109057813A CN 109057813 A CN109057813 A CN 109057813A CN 201810743750 A CN201810743750 A CN 201810743750A CN 109057813 A CN109057813 A CN 109057813A
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China
Prior art keywords
pit shaft
spray head
pressure water
rock
cutting groove
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CN201810743750.6A
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CN109057813B (en
Inventor
梁伟章
赵国彦
刘雷磊
吴浩
陈英
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Central South University
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Central South University
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    • 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
    • E21D9/10Making by using boring or cutting machines
    • E21D9/1066Making by using boring or cutting machines with fluid jets
    • 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
    • E21D9/10Making by using boring or cutting machines

Abstract

The present invention provides a kind of method using high-pressure water jet prevention and treatment pit shaft rock burst, comprising steps of the advanced destressing borehole of (S1) at the uniform Drilling of the borehole wall 3 or more;(S2) high-pressure water shot flow tube and spray head are put into drilling, water beam fractured rock is sprayed in foot of hole by spray head and forms perforation;(S3) high-pressure water shot flow tube is constantly rotated, the injection direction of spray head is adjusted, obtains several perforations that depth is identical and is generally aligned in the same plane, is formed using spray head as the round cutting groove in the center of circle;(S4) (S2)-(S3) is repeated, round cutting groove is respectively formed in each foot of hole, perforating depth corresponding to each circle cutting groove and orientation intersect two neighboring round cutting groove two-by-two, the ring pit shaft crushed zone of connection is formed outside the borehole wall, advanced continuous release is realized with this, and country rock is softened by rock cranny using high pressure water, realize the purpose of efficiently prevention and treatment rock burst.

Description

A method of pit shaft rock burst is prevented and treated using high-pressure water jet
Technical field
The invention belongs to shaft excavation engineering technical fields more particularly to a kind of utilization high-pressure water jet to prevent and treat pit shaft rock burst Method, the Disaster control especially suitable for the high rockburst risk region of mine shaft excavation.
Background technique
Deep pit shaft country rock is in the extreme geology mechanical environment of " a three high disturbances ", excavates hard rock under these conditions and goes out A possibility that deep engineerings disasters such as existing high intensity rock burst and frequency are higher and higher, caused by casualties, construction delay and warp The risk lost of helping and seriousness are increasing.Therefore, effectively preventing for ensuring that construction personnel is raw to deep pit shaft rock burst Life safety and pit shaft efficiently construct and all have important meaning.
Relieving shot is one of current prevention and treatment most important mode of rock burst.By inside the rock mass for having very big rock burst tendency Construction drill, and standing is carried out in drilling end, it is released the energy in country rock and achievees the purpose that prevent and treat rock burst. However, relieving shot deposits obvious shortcoming in terms of preventing and treating pit shaft rock burst.Firstly, the secondary power that relieving shot forms country rock is disturbed It is dynamic that wellbore stability can be produced bigger effect, borehole wall rock mass damage is easily caused when especially dosage is excessive;Secondly, release is quick-fried The broken release only for a point, cannot form continuous fractured rock stress relieving layer in entire pit shaft peripheral region, Cause release effect undesirable.Another common method for mitigating rock burst is water filling, by the way that high pressure water is perfused into hole, makes to enclose Rock weakening strength and eliminate rockburst risk.However, hard rock preferable for integrality, since rock permeability is poor, water filling is anti- The range for controlling rock burst is small, and the time is long.
Summary of the invention
In view of the above problems in the prior art, the present invention provides a kind of side using high-pressure water jet prevention and treatment pit shaft rock burst Method forms the crushed zone around pit shaft using high pressure water Shu Dingxiang fragmented rock body, while high-pressure hydraulic softens through rock cranny Country rock achievees the purpose that efficiently to prevent and treat rock burst.
To achieve the above object, the invention adopts the following technical scheme:
A method of pit shaft rock burst being prevented and treated using high-pressure water jet, comprising steps of
(S1) in the uniform Drilling of the borehole wall 3 or more advanced destressing boreholes, boring aperture is preferably 38~50mm, and hole depth exists Apart from identical, the axial angle with pit shaft axial direction of drilling is preferably 30~60 ° for the projector distance of pit shaft axial direction and pit shaft drilling depth;
(S2) high-pressure water shot flow tube is put into drilling, foot of hole is placed the spray head connecting with high-pressure water shot flow tube, passed through Spray head sprays water beam fractured rock and forms perforation;
(S3) continuous rotation high-pressure water shot flow tube, adjusts the injection direction of spray head, and it is identical and be located at same flat to obtain depth Several perforations in face are formed using spray head as the round cutting groove in the center of circle;
(S4) (S2)-(S3) is repeated, is respectively formed round cutting groove in each foot of hole, corresponding to each circle cutting groove Perforating depth and orientation intersect two neighboring round cutting groove two-by-two, and the ring pit shaft crushed zone of connection is formed outside the borehole wall, Preferably, each round cutting groove diameter is identical, each parallel to pit shaft longitudal section.
Preferably, drilling hole amount is 8~12, is uniformly distributed along pit shaft circumferential direction every 30~45 °.
Preferably, high-pressure water jet bore is 5~10mm, and outer diameter is 10~20mm.
Preferably, the long 6~10mm of spray head, internal diameter are 4~6mm, and outer diameter is 8~12mm.
Preferably, it being uniformly arranged the nozzle that several diameters are 2~3mm along spray head circumferential direction, nozzle quantity is preferably 4, It is uniformly distributed along spray head circumferential direction every 90 °.
Preferably, spray head is axial axially vertical with pit shaft longitudal section and nozzle respectively.
Beneficial effects of the present invention:
(1) by forming continuous ring pit shaft crushed zone in ahead work face, the rock mass being inclined to strong rock burst is carried out Advanced release can more effectively unload the high stress and high-energy in country rock, country rock is avoided to answer compared with traditional single-point release Power and energy are assembled in non-distressed zone and induce more massive rock burst, and pit shaft is excavated in ring pit shaft crushed zone, rock burst Disaster is prevented and treated in advance, and working security is good.
(2) high-pressure water jet can not only carry out release by fragmented rock body, moreover it is possible to soften country rock, induce rock cranny and expand Exhibition, perforation, fusion take full advantage of release and fill the water the advantage of two kinds of rock-burst prevention methods, realize the mesh of efficiently prevention and treatment rock burst , efficiently solve the safe construction problem of high rock burst protruding type pit shaft.
Detailed description of the invention
Fig. 1 is borehole pattern;
Fig. 2 is the A-A cross-sectional view of Fig. 1;
Fig. 3 is high-pressure water shot flow tube and nozzle structure schematic diagram in drilling;
Fig. 4 is the B-B cross-sectional view of Fig. 3;
Fig. 5 is pit shaft rock-burst prevention effect picture;
Fig. 6 is the C-C cross-sectional view of Fig. 5;
Fig. 7 is the D-D cross-sectional view of Fig. 5;
In figure: 1- pit shaft;2- drilling;3- high-pressure water shot flow tube;4- spray head;5- nozzle;6- ring pit shaft crushed zone;7- is penetrated Hole;8- circle cutting groove.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described in detail.
Referring to Fig. 1-7, the present invention using high-pressure water jet prevention and treatment pit shaft rock burst method comprising steps of
Step 1: in 8~12 advanced destressing boreholes 2 of the uniform Drilling of 1 borehole wall of pit shaft, aperture is 38~50mm, and hole depth exists The axial projector distance of pit shaft 1 is with 1 drilling depth of pit shaft apart from identical.To guarantee uniform release effect, while drilling 2 being avoided to cause Borehole wall rock mass damage in digging process, drilling 2 and the angle of vertical direction are 30~60 °, along pit shaft 1 it is circumferential every 30~ 45 ° are uniformly distributed.
Step 2: by 5~10mm of internal diameter, the high-pressure water shot flow tube 3 of 10~20mm of outer diameter and long 6~10mm, internal diameter 4~ 6mm, 8~12mm of outer diameter spray head 4 be put into 2 bottoms of drilling, the circumferential spray that 4 2~3mm of diameter are uniformly arranged every 90 ° of spray head 4 Mouth 5, water is pressurized using high pressure or super-pressure pump to be formed high speed, high energy, high penetrating power water beam, projected by nozzle 5, thus 4 perforations 7 of fractured rock formation certain depth.In the present embodiment, spray head 4 is axial axial vertical with 1 longitudal section of pit shaft and nozzle 5 Directly, convenient for preferably control jet direction.
Step 3: slowly rotation high-pressure water shot flow tube 3 adjusts the injection direction of nozzle 5, in 5 place plane of nozzle shape again At the identical perforation 7 of 4 depth, high-pressure water shot flow tube 3 is constantly rotated, is the center of circle with spray head 4 and is parallel to pit shaft 1 until being formed The round cutting groove 8 of longitudal section.The present embodiment is tangentially oriented rock breaking by water jet in pit shaft 1, to the radial rock mass disturbance of pit shaft 1 Very little substantially reduces the Secondary Disturbance destruction to pit shaft 1, is conducive to the highly effective and safe construction of high rock burst tendency type pit shaft.
Step 4: same size is respectively formed in 2 bottoms of each drilling with identical method and is parallel to 1 longitudal section of pit shaft Round cutting groove 8, two neighboring circle cutting groove 8 intersects two-by-two, and the ring pit shaft crushed zone 6 of connection is formed outside the borehole wall, real Now advanced continuous release, while high-pressure hydraulic softens country rock by rock cranny, effectively combines two kinds of rock bursts of release and water filling The advantage of control method, rock-burst prevention effect are good, high-efficient.
After the driving distance for completing a drilling depth, step 1 is repeated to four, until shaft construction finishes, or is at least protected Card rockburst risk area segments shaft construction finishes.
The above embodiments are merely illustrative of the technical solutions of the present invention and is not intended to limit it, all without departing from the present invention Any modification of spirit and scope or equivalent replacement should all cover in the protection scope of technical solution of the present invention.

Claims (10)

1. a kind of method using high-pressure water jet prevention and treatment pit shaft rock burst, which is characterized in that comprising steps of
(S1) in the uniform Drilling of the borehole wall 3 or more advanced destressing boreholes;
(S2) high-pressure water shot flow tube is put into drilling, foot of hole places the spray head connecting with high-pressure water shot flow tube, passes through spray head It sprays water beam fractured rock and forms perforation;
(S3) continuous rotation high-pressure water shot flow tube, adjusts the injection direction of spray head, and it is identical and be generally aligned in the same plane to obtain depth Several perforations are formed using spray head as the round cutting groove in the center of circle;
(S4) (S2)-(S3) is repeated, is respectively formed round cutting groove, perforation corresponding to each circle cutting groove in each foot of hole Depth and orientation intersect two neighboring round cutting groove two-by-two, and the ring pit shaft crushed zone of connection is formed outside the borehole wall.
2. hole depth is in pit shaft axial direction the method according to claim 1, wherein boring aperture is 38~50mm Projector distance is with pit shaft drilling depth apart from identical.
3. method according to claim 1 or 2, which is characterized in that the axial angle with pit shaft axial direction of drilling is 30~ 60°。
4. method according to claim 1 or 2, which is characterized in that drilling hole amount be 8~12, along pit shaft circumferential direction every 30~45 ° are uniformly distributed.
5. according to the method described in claim 4, it is characterized in that, each foot of hole formed round cutting groove diameter it is identical, Each parallel to pit shaft longitudal section.
6. according to the method described in claim 2, it is characterized in that, high-pressure water jet bore be 5~10mm, outer diameter be 10~ 20mm。
7. according to the method described in claim 6, it is characterized in that, spray head grow 6~10mm, internal diameter be 4~6mm, outer diameter be 8~ 12mm。
8. the method according to the description of claim 7 is characterized in that being uniformly arranged several diameters along spray head circumferential direction is 2~3mm Nozzle.
9. according to the method described in claim 8, it is characterized in that, the nozzle quantity is 4, along spray head circumferential direction every 90 ° It is uniformly distributed.
10. according to the method described in claim 8, it is characterized in that, spray head is axial axial with pit shaft longitudal section and nozzle respectively Vertically.
CN201810743750.6A 2018-07-09 2018-07-09 Method for preventing and treating rock burst of shaft by using high-pressure water jet Active CN109057813B (en)

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CN201810743750.6A CN109057813B (en) 2018-07-09 2018-07-09 Method for preventing and treating rock burst of shaft by using high-pressure water jet

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Application Number Priority Date Filing Date Title
CN201810743750.6A CN109057813B (en) 2018-07-09 2018-07-09 Method for preventing and treating rock burst of shaft by using high-pressure water jet

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CN109057813B CN109057813B (en) 2021-04-20

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4103971A (en) * 1975-09-19 1978-08-01 Atlas Copco Aktiebolag Method for breaking rock by directing high velocity jet into pre-drilled bore
JPH0448895B2 (en) * 1989-10-16 1992-08-10 Muto Komuten Kk
CN101864961A (en) * 2010-05-27 2010-10-20 武汉大学 Method for actively preventing and controlling rock burst
CN205297592U (en) * 2016-01-15 2016-06-08 中国电建集团华东勘测设计研究院有限公司 TBM tunnelling tunnel heavily stressed risk decontrol in face place ahead and structure
CN103821516B (en) * 2014-03-10 2016-09-21 平顶山天安煤业股份有限公司 The method of secondary release preventing and treating bump
CN107165638A (en) * 2017-05-27 2017-09-15 江西省交通科学研究院 A kind of deep tunnel rock burst active preventing control method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4103971A (en) * 1975-09-19 1978-08-01 Atlas Copco Aktiebolag Method for breaking rock by directing high velocity jet into pre-drilled bore
JPH0448895B2 (en) * 1989-10-16 1992-08-10 Muto Komuten Kk
CN101864961A (en) * 2010-05-27 2010-10-20 武汉大学 Method for actively preventing and controlling rock burst
CN103821516B (en) * 2014-03-10 2016-09-21 平顶山天安煤业股份有限公司 The method of secondary release preventing and treating bump
CN205297592U (en) * 2016-01-15 2016-06-08 中国电建集团华东勘测设计研究院有限公司 TBM tunnelling tunnel heavily stressed risk decontrol in face place ahead and structure
CN107165638A (en) * 2017-05-27 2017-09-15 江西省交通科学研究院 A kind of deep tunnel rock burst active preventing control method

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