CN1693670A - Three-anchor coupling supporting method for high stress tunnel break wall rock - Google Patents
Three-anchor coupling supporting method for high stress tunnel break wall rock Download PDFInfo
- Publication number
- CN1693670A CN1693670A CN 200510040159 CN200510040159A CN1693670A CN 1693670 A CN1693670 A CN 1693670A CN 200510040159 CN200510040159 CN 200510040159 CN 200510040159 A CN200510040159 A CN 200510040159A CN 1693670 A CN1693670 A CN 1693670A
- Authority
- CN
- China
- Prior art keywords
- anchor
- rock
- bolting
- tunnel
- wire mesh
- Prior art date
Links
- 239000011435 rock Substances 0.000 title claims abstract description 35
- 238000010168 coupling process Methods 0.000 title claims abstract description 13
- 238000005859 coupling reactions Methods 0.000 title claims abstract description 13
- 230000001808 coupling Effects 0.000 title claims description 12
- 238000010276 construction Methods 0.000 claims abstract description 10
- 230000003014 reinforcing Effects 0.000 claims description 11
- 230000001680 brushing Effects 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 230000011218 segmentation Effects 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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Abstract
Description
Technical field
The present invention relates to the high stress tunnel break wall rock three-anchor coupling supporting method, be particularly useful for the supporting of mine complex region and buried heavily stressed breaking surrounding rock or soft-rock tunnel.
Background technology
Complex structure zone and buried heavily stressed wall rock laneway support have become an outstanding difficult problem that faces in the production at present.Such tunnel adopts the supporting of traditional U shaped steel, anchor rete cord or bolt-grouting support can't satisfy stable requirement, has had a strong impact on the safety in production of mine and the raising of economic benefit.
Summary of the invention
The high stress tunnel break wall rock three-anchor coupling supporting method that the purpose of this invention is to provide a kind of bolt-spary supports, anchor cable reinforcing and bolt-grouting support.
The step of high stress tunnel break wall rock three-anchor coupling supporting method of the present invention is as follows:
(1) light section tunnelling construction is carried out in segmentation, adopts the back spacing distance of anchor pole and reinforcing bar ladder and the timely light section construction section of wire lath to carry out first bolting with wire mesh;
(2) allow country rock to produce the pressure relief vent of deformation and failure along helping spacing distance to drill through the light section tunnel two behind the first bolting with wire mesh of top board;
(3) treat two help country rock to produce the distortion release after, the brushing section carries out full section secondary bolting with wire mesh with anchor pole and reinforcing bar ladder and wire lath on the cross sections of bolting with wire mesh for the first time, enforcement two is helped, the bolting with wire mesh at drift angle and base angle;
(4) on each cross section, roof rock mass is carried out prestressed anchor reinforcement with anchor cable;
(5) finish the full face bolting with wire mesh in tunnel after, grouted anchor bar in the top board in the cross section between bolting with wire mesh, two is helped to install with base angle spacing distance perforating, and carry out grouting and reinforcing, make along digging laneway at interval cross sections and cross sections between form the coupling supporting that bolting with wire mesh and bolt-grouting support replace.For the violent part tunnel of distortion, local increasing arranged interior grouted anchor bar, carries out multiple notes behind the sealing of hole again.
High stress tunnel break wall rock three-anchor coupling supporting method of the present invention, big at buried depth, complex structure, country rock roof cracking characteristics, adopt " control top release " to discharge method heavily stressed and that " three anchors " coupling supporting is reinforced country rock and reinforced support in key position, utilization " control top release " mode, in the tunnelling process, adopt first light section driving and supporting, and help to be drilled with the pressure relief vent that allows country rock to produce deformation and failure two, heavily stressed obtaining in the country rock discharged, brush construction technology big and reinforcing then, in stress-relief process at the top, the base angle adds strong supporting, effectively the deformation and failure of control back reaches the purpose of stablizing country rock.Bolt-spary supports in coal road and the soft rock supporting, anchor cable reinforcing and bolt-grouting support are organically combined, give full play to its relation of intercoupling, solved the supporting problem of complex structure zone and buried heavily stressed breaking surrounding rock or soft-rock tunnel.Its stability is strong, workable, safe and reliable, has practicality widely.
Description of drawings
Fig. 1 is first bolting with wire mesh in light section of the present invention tunnel and pressure relief vent schematic diagram.
Fig. 2 is the full section secondary of a present invention bolting with wire mesh schematic diagram.
Fig. 3 is the full section bolt-grouting support of a present invention schematic diagram.
The specific embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are further described:
High stress tunnel break wall rock three-anchor coupling supporting method of the present invention, according to on-site actual situations, at first, analyze the deformation failure characteristics and the failure mechanism of roadway surrounding rock by investigation and actual measurement to complex structure zone and buried heavily stressed breaking surrounding rock roadway destruction situation; Utilization wall rock loosening ring support theory utilizes actual measurement wall rock loosening ring value, determines at digging laneway cross section technical data a, b, c, α, β, L 1, L 2, L 3, L 4And grouting parameter; Adopt first light section driving in the work progress and carry out roof timbering, the anchor pole spacing of light section roof timbering is a, selects a=70cm for use; Beat an amount of pressure relief vent at the two anchor pole gap locations of helping, behind the release portion pressure, brush big two and help to set section width and apply bolt-spary supports, the hysteresis certain distance is beaten grouted anchor bar and is carried out slip casting every row; Press the monitoring feedback information to optimize supporting parameter by the ore deposit at last, guarantee the stable of tunnel.Concrete steps are as follows:
(1) the first bolting with wire mesh of light section tunnelling and top board.At first adopt drilling and blasting method to carry out tunneling construction, behind place cleaning, the twisted steel anchor rod 1 of perforating in time and installation top board resin anchoring re-lays wire lath and reinforcing bar ladder 7, and compresses with anchor pole pallet and nut, applies certain prestressing force then; Can select the length L of anchor pole 1 for use 1Be 220cm; After finishing whole supportings and discharge refuse, carry out the driving and the supporting of next circulation again.
(2) release.Suitable pressure relief vent 2 is helped to beat in light section tunnel two behind first bolting with wire mesh.
(3) brushing section and full section secondary bolting with wire mesh.Hysteresis light section driving face 10～15m, after coal body generation explosion, after being release, the brush that carries out drift section again is big, brushing big width b determines according to on-site actual situations, be about 30～60cm, brushing big section mainly constructs with artificial or cooperation pneumatic pick, purpose is to alleviate the destruction of helping coal body to two as far as possible, in time implement drift angle anchor pole 4 then, two help the supporting of anchor pole 5 and base angle anchor pole 6, the vertical angle α that acts on the drift angle anchor pole 4 on the top board is 30 ° with the horizontal sextant angle α that acts on the two drift angle anchor poles 4 of helping, and the horizontal sextant angle of base angle anchor pole 6 is 15 °; Base angle anchor pole 6L 4Can select length for use is 240cm.
(4) roof rock mass prestressed anchor reinforcement.The construction of general prestress anchorage cable can be after finishing full section bolting with wire mesh, and accumulative total in time installs after reaching the array pitch of anchor cable, also can carry out once concentrating augmenting behind the bolting with wire mesh of finishing about 10～15m.During construction, at first hole with jumbolter along the vertical direction of roof strata at the middle part of back, after reaching the design hole depth, unload drilling rod, the order resin explosive roll of packing into, with steel strand resin is delivered to the hole at the bottom of, and steel strand are linked to each other with jumbolter, and then start the rig agitating resin, and steel strand are delivered to the eyeground, realize the anchoring of anchor cable 3.After waiting for about 30min, carry out the stretch-draw of anchor cable 3 again and fix anchor cable 3L 2Can select length for use is 550cm.
(5) anchor pouring reinforcement.After finishing the full face bolting with wire mesh in tunnel; grouted anchor bar 8 in the perforating installation is helped in two of tunnel; the array pitch of grouted anchor bar 8 is the same with resin anchor 5 spacings; and put every arranging; adopt a volume rapid setting cement end anchor, after then the aperture of anchor pole 8 being protected, the sealing of whitewashing; and then utilizing the aperture of the interior grouted anchor bar 8 that exposes to carry out grouting and reinforcing again, the horizontal sextant angle β of drift angle and base angle grouted anchor bar 8 is 15 °.
Adopt during mortar depositing construction from bottom to top, the mode of left and right sides sequential analysis; Anchor pole also adopts from bottom to top in each section, and first base angle two is helped again, is drift angle at last.Spacing distance between cross sections and the cross sections is 0.6～1 meter.For the violent part tunnel of distortion, behind the vertically first anchor pouring reinforcement 15～20m in tunnel, plug hole is arranged grouted anchor bar 8 in multiple the notes again, carries out multiple notes behind the sealing of hole again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510040159 CN1693670A (en) | 2005-05-19 | 2005-05-19 | Three-anchor coupling supporting method for high stress tunnel break wall rock |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510040159 CN1693670A (en) | 2005-05-19 | 2005-05-19 | Three-anchor coupling supporting method for high stress tunnel break wall rock |
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| CN1693670A true CN1693670A (en) | 2005-11-09 |
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| CN101122235B (en) * | 2007-10-31 | 2010-05-19 | 中国矿业大学 | Method for controlling wall rock of fully mechanized coal face goaf side coalbed laneway |
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| CN102425428A (en) * | 2011-09-12 | 2012-04-25 | 山东科技大学 | Method for controlling extreme broken roof in roadway head |
| CN102678142A (en) * | 2011-12-28 | 2012-09-19 | 张千管 | Multi-directional inclined combination type anchoring system for horizontal lamellar surrounding rock of tunnel and mounting method thereof |
| CN102678142B (en) * | 2011-12-28 | 2014-11-19 | 张千管 | Multi-directional inclined combination type anchoring system for horizontal lamellar surrounding rock of tunnel and mounting method thereof |
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| CN103277124A (en) * | 2013-06-06 | 2013-09-04 | 武汉科技大学 | Anchor-rod-combined supporting method for high-sulfur crush rock mine |
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