CN103075170A - Method for controlling surrounding rock deformation of gateway subjected to repeated overhead mining by using hollow grouting anchor cable - Google Patents
Method for controlling surrounding rock deformation of gateway subjected to repeated overhead mining by using hollow grouting anchor cable Download PDFInfo
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- CN103075170A CN103075170A CN2013100112341A CN201310011234A CN103075170A CN 103075170 A CN103075170 A CN 103075170A CN 2013100112341 A CN2013100112341 A CN 2013100112341A CN 201310011234 A CN201310011234 A CN 201310011234A CN 103075170 A CN103075170 A CN 103075170A
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Abstract
The invention relates to a method for controlling surrounding rock deformation of a gateway subjected to repeated overhead mining by using a hollow grouting anchor cable. The method comprises the following implementation steps of: performing repair brushing on the section of the gateway, reinforcing support in a bottom plate gateway to be mined in an advance face which is 280-320 meters in range by adopting high-performance pre-stressed anchor rods, and meanwhile, arranging a metal net on the entire section of the gateway; arranging a novel hollow grouting anchor cable between a top plate of the gateway and the high-performance pre-stressed anchor rods on both sides; grouting on the surface of the surrounding rock of the gateway for enclosing; and injecting a grouting material into the hollow grouting anchor cable. The method has the characteristics of high setting load, sudden increase in resistance and high bearing capability, the problems of high gateway deformation, strong heaving floors and difficulty in maintaining can be well solved, the gateway repair times are reduced, and the gateway support cost is reduced effectively; and the method is particularly suitable for solving the problems of rapid attenuation and loss of anchoring force caused by looseness, breakage and large deformation of surrounding rock due to repeated overhead mining on the gateway.
Description
Technical field
The present invention relates to a kind of mine down-hole that is applicable to and be subjected to repeatedly to stride the method for adopting the reinforcing laneway that affects, especially a kind of hollow grouting cable anchor is controlled repeatedly the method for deformation of surrounding rocks of gallery influenced by overhead mining.
Background technology
Coal seam group with near interval generally adopts multiple seam to unite the mining type of layout, arrange preparatory working at seat earth, advance continuously length for increasing work plane, reduce the removal of home number of times, many mining areas are adopted and are striden the tunnel exploitation, cause the drastic deformation of being striden the tunnel during adopting and even destroy unstability.Along with China to the continuing to increase and mining conditions day by day complicated of coal demand, repeatedly roadway influenced by overhead mining almost becomes the technical barrier that can not avoid, its proportion will further increase.
At present, the method for controlling repeatedly deformation of surrounding rocks of gallery influenced by overhead mining has: metallic support supporting, wall rock grouting are reinforced, the rete cord supporting of anchor band and combined supporting.Though these methods can solve some on-the-spot practical problems, but the metallic support supporting belongs to the passive protecting form, the wall rear space is large, and the support initial stage can't be brought into play larger bearing capacity, and when empty when surrouding rock deformation has remedied wall after, loosening area of surrounding rocks is very large; Wall rock grouting is reinforced and is just reinforced the superficial part breaking surrounding rock, and the deep breaking surrounding rock can't be reinforced; The common anchor cable destructible that the supporting of anchor band rete cord is adopted, steel band is yielding, and supporting effect is undesirable; And combined supporting complex procedures and cost are higher.Repeatedly striding under the condition of adopting, roadway surrounding rock stress sharply increases, and the plastic zone scope enlarges markedly, and the tunnel is repaiied bad repeatly repeatly at viability, and above method has not satisfied requirement, has had a strong impact on the safety and high efficiency of coal resources.Therefore, effective control of this type of roadway surrounding rock becomes the key factor that the production of restriction coal in China further develops.Current, still lack the support technology to deformation of surrounding rocks of gallery influenced by overhead mining control significant effective.
Summary of the invention
In order to solve the problem of existing deformation of surrounding rocks of gallery influenced by overhead mining control technology DeGrain, the invention provides a kind of hollow grouting cable anchor and control repeatedly the method for deformation of surrounding rocks of gallery influenced by overhead mining, the method combines the support action of anchor cable and the effect of grouting and reinforcing, acting in conjunction is in roadway surrounding rock, by grouting cable anchor pressure injection organic or inorganic slurries, guarantee fundamentally that not only anchorage cable anchoring is reliable, and slurries can be penetrated into around the boring in a big way the country rock, produce the adhesive solidification effect to loosening broken country rock occurring, significantly improve its globality, improve the self-supporting tendency of country rock, thereby greatly improving supporting effect of roadway, is a kind of extraordinary active support form.
The technical solution adopted for the present invention to solve the technical problems is: the method implementation step that this hollow grouting cable anchor is controlled repeatedly deformation of surrounding rocks of gallery influenced by overhead mining is:
(1) drift section is repaired the expansion brush, after once supporting and Shallow hole grouting are finished one month or after roadway surrounding rock fully is out of shape, adopt Φ 20mm-Φ 24mm performance prestressed high anchor pole to add strong supporting to first advance 280m-320m being about to be adopted base plate tunnel, between array pitch be 600mm-1000mm, all be arranged in the space of once supporting anchor pole, whole section is laid wire lath in the tunnel simultaneously, thereby finishes secondary supporting.
(2) Installation of New Type hollow grouting cable anchor between the performance prestressed high anchor pole that back and two is helped, the array pitch of hollow grouting cable anchor is 1600mm-3200mm.
(3) in the whitewashing sealing of roadway surrounding rock surface, the slurry layer thickness is 50mm-100mm;
(4) in the hollow grouting cable anchor, inject injecting paste material;
Described wire lath adopts Φ 5mm-Φ 7mm cold-drawn arc welding steel mesh reinforcement, appearance and size 2500mm * 900mm, mesh specification 100mm * 100 mm.
The hollow grouting cable anchor that described Novel hollow grouting cable anchor is screw-threaded coupling, this anchor cable forms by steel strand and with the close-connected threaded sleeve of its tail end.
The limit Fracture Force of described Novel hollow grouting cable anchor is 400kN-800kN, and anchored force is 280kN-600kN, and band rib steel wire elongation per unit length is δ=4～6%.
Described performance prestressed high anchor pole is that the body of rod is the vertical muscle screw-thread steel of left-handed nothing of Φ 20mm-Φ 24mm.
Described performance prestressed high anchor pole is the vertical muscle twisted steel anchor rod of left-handed nothing, and limit Fracture Force is 300kN-500KN, and pretightning force is 60kN-100kN, and anchored force is 120kN-200kN.
Described injecting paste material is cement grout, and water/binder ratio is 1:1, and adding cement amount is the ACZ-of 7%-9%
The slip casting additive.
The invention has the beneficial effects as follows, the method combines the support action of anchor cable and the effect of grouting and reinforcing, acting in conjunction is in roadway surrounding rock, by grouting cable anchor pressure injection organic or inorganic slurries, guarantee fundamentally that not only anchorage cable anchoring is reliable, and slurries can be penetrated into around the boring in a big way the country rock, produce the adhesive solidification effect to loosening broken country rock occurring, significantly improve its globality, improve the self-supporting tendency of country rock, thereby greatly improving supporting effect of roadway, is a kind of extraordinary active support form.The method has strong just support, the anxious characteristic that increases resistance, high-bearing, can solve preferably the problem that the roadway deformation amount is large, pucking is strong, difficult in maintenance, reduce the repair of laneway number of times, effectively reduce the roadway support cost, be particularly useful for solving the tunnel and be subjected to repeatedly to stride the problem of adopting the rapid decay of the anchored force that wall rock loosening is broken and large deformation causes that causes and forfeiture.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is hollow grouting cable anchor supporting schematic diagram of the present invention.
Fig. 2 is hollow grouting cable anchor supporting schematic top plan view of the present invention.
Among the figure, 1. hollow grouting cable anchor, 2. performance prestressed high anchor pole, 3. drift section, 4. wire lath.
The specific embodiment
In the drawings, tunnel in this example is that the inclination angle is 13 ° base plate tunnel, the reparation drift section is: bottom width * middle height=4100mm * 3350mm, being covered work plane strides for 3 times to adopt affect at least, adopt hollow grouting cable anchor of the present invention to control repeatedly deformation of surrounding rocks of gallery influenced by overhead mining method, its concrete implementation step is as follows:
(1) drift section 3 is repaired the expansion brush, after once supporting and Shallow hole grouting are finished one month, adopt Φ 22mm performance prestressed high anchor pole 2 to add strong supporting to first advance 300m being about to be adopted base plate tunnel, between array pitch be 800mm * 800mm, all be arranged in the space of once supporting anchor pole, whole section is laid wire lath 4 in the tunnel simultaneously, thereby finishes secondary supporting.
Performance prestressed high anchor pole 2 selects the left-handed nothing of M24-Φ 22 * 2400mm to indulge the muscle twisted steel anchor rod, limit Fracture Force is 500kN, pretightning force is 100kN, anchored force is 200 kN, every anchor pole saves Z2535 resin explosive roll the extensible boltings, the high strength arch pallet of adapted specification 200mm * 200mm * 10 mm with 3.Described wire lath adopts Φ 6mm cold-drawn arc welding steel mesh reinforcement, appearance and size 2500mm * 900mm, mesh specification 100mm * 100 mm.
(2) arrange that in this tunnel five Novel hollow grouting cable anchors 1 add strong supporting, the anchor cable specification of selecting is Φ 22 * 6300mm, Fracture Force is 800kN, anchored force is 300kN, band rib steel wire elongation per unit length is δ=5%, adapted pallet dimension 300mm * 300mm * 15mm, end resin anchoring segment length 1200mm; Every anchor cable adopts 1 Z2950 and 1 Z2535 middling speed resin explosive roll to realize end anchorage, and the hollow grouting cable anchor is arranged in the space between the anchor pole entirely, anchor cable array pitch 1600mm, and top anchor cable 1600mm in the shoulder nest anchor cable distance, the side anchor cable is apart from adjacent shoulder nest anchor cable 2000mm; Described Novel hollow grouting cable anchor 1 is the hollow grouting cable anchor of screw-threaded coupling.
(3) in the whitewashing sealing of roadway surrounding rock surface, the slurry layer thickness is 70mm;
(4) press observation to determine time for injecting according to the ore deposit, general meet head on 50m or the anchor cable of lagging behind installed after 1 month and can to hollow grouting cable anchor 1 interior injection injecting paste material, be realized full length fastening; Described injecting paste material is cement grout, and water/binder ratio is 1:1, and the adding cement amount is 8% ACZ-
The slip casting additive.
Claims (7)
1. a hollow grouting cable anchor is controlled repeatedly the method for deformation of surrounding rocks of gallery influenced by overhead mining, it is characterized in that, drift section (3) is repaired the expansion brush, after once supporting and Shallow hole grouting are finished one month or after roadway surrounding rock fully is out of shape, adopt Φ 20mm-Φ 24mm performance prestressed high anchor pole (2) to add strong supporting to first advance 280m-320m being about to be adopted base plate tunnel, between array pitch be 800mm * 800mm, all be arranged in the space of once supporting anchor pole, whole section is laid wire lath (4) in the tunnel simultaneously, thereby finishes secondary supporting; Installation of New Type hollow grouting cable anchor (1) between the performance prestressed high anchor pole (2) that back and two is helped, the array pitch of hollow grouting cable anchor (1) is 1600mm-3200mm; In the whitewashing sealing of roadway surrounding rock surface, the slurry layer thickness is 50mm-100mm; In hollow grouting cable anchor (1), inject injecting paste material.
2. wire lath according to claim 1 (4) is characterized in that, described wire lath (4) adopts Φ 5mm-Φ 7mm cold-drawn arc welding steel mesh reinforcement, appearance and size 2500mm * 900mm, mesh specification 100mm * 100 mm.
3. Novel hollow grouting cable anchor according to claim 1 (1) is characterized in that, described Novel hollow grouting cable anchor (1) is the hollow grouting cable anchor of screw-threaded coupling, and this anchor cable forms by steel strand and with the close-connected threaded sleeve of its tail end.
4. Novel hollow grouting cable anchor according to claim 3 (1) is characterized in that, the limit Fracture Force of described Novel hollow grouting cable anchor (1) is 400kN-800kN, and anchored force is 280kN-600kN, and band rib steel wire elongation per unit length is δ=4～6%.
5. performance prestressed high anchor pole according to claim 1 (2) is characterized in that, described performance prestressed high anchor pole (2) is that the body of rod is the vertical muscle screw-thread steel of left-handed nothing of Φ 20mm-Φ 24mm.
6. performance prestressed high anchor pole according to claim 5 (2), it is characterized in that, described performance prestressed high anchor pole (2) is the vertical muscle twisted steel anchor rod of left-handed nothing, and limit Fracture Force is 300kN-500KN, pretightning force is 60kN-100kN, and anchored force is 120kN-200kN.
7. injecting paste material according to claim 1 is characterized in that, described injecting paste material is cement grout, and water/binder ratio is 1:1, and adding cement amount is the ACZ-of 7%-9%
The slip casting additive.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628894A (en) * | 2013-10-24 | 2014-03-12 | 重庆大学 | Water-rich fault fracture zone collapsed roadway repairing method based on angle-variable umbrella-shaped advancing grouting |
| CN103899329A (en) * | 2014-03-24 | 2014-07-02 | 中国矿业大学 | Large-deformation broken surrounding rock roadway management method |
| CN104405398A (en) * | 2014-10-21 | 2015-03-11 | 新汶矿业集团有限责任公司 | Ingate anti-impact damping supporting structure |
| CN105260575A (en) * | 2015-11-17 | 2016-01-20 | 中国矿业大学 | Roadway surrounding rock deformation predicting method based on neural network |
| CN106321119A (en) * | 2016-11-09 | 2017-01-11 | 贵州大学 | Double-layer anchor net cable supporting structure for controlling mining roadway surrounding rock deformation and method thereof |
| CN107869350A (en) * | 2017-10-25 | 2018-04-03 | 山东科技大学 | A kind of new drop rushes colliery bolting with wire mesh method |
| CN108150208A (en) * | 2018-01-17 | 2018-06-12 | 淮南东华欧科矿山支护设备有限责任公司 | A kind of construction method of tunnel total bolt support |
| CN110470269A (en) * | 2019-08-21 | 2019-11-19 | 山东大学 | Reinforcing laneway prediction scheme is comprehensive to determine method |
| CN111894625A (en) * | 2020-08-13 | 2020-11-06 | 高军 | Large-section weak surrounding rock high-prestress anchor rod supporting method and device |
| CN112664248A (en) * | 2020-12-25 | 2021-04-16 | 国家能源集团宁夏煤业有限责任公司 | Soft rock water spraying roadway supporting method |
| CN113638756A (en) * | 2021-09-09 | 2021-11-12 | 辽宁工程技术大学 | Anchor cable supporting method for treating roadway floor heave and anchor cable |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628894A (en) * | 2013-10-24 | 2014-03-12 | 重庆大学 | Water-rich fault fracture zone collapsed roadway repairing method based on angle-variable umbrella-shaped advancing grouting |
| CN103899329A (en) * | 2014-03-24 | 2014-07-02 | 中国矿业大学 | Large-deformation broken surrounding rock roadway management method |
| CN103899329B (en) * | 2014-03-24 | 2016-03-30 | 中国矿业大学 | A kind of administering method of large deformation breaking surrounding rock tunnel |
| CN104405398A (en) * | 2014-10-21 | 2015-03-11 | 新汶矿业集团有限责任公司 | Ingate anti-impact damping supporting structure |
| CN105260575B (en) * | 2015-11-17 | 2018-12-04 | 中国矿业大学 | A kind of deformation of the surrounding rock in tunnel prediction technique neural network based |
| CN105260575A (en) * | 2015-11-17 | 2016-01-20 | 中国矿业大学 | Roadway surrounding rock deformation predicting method based on neural network |
| CN106321119A (en) * | 2016-11-09 | 2017-01-11 | 贵州大学 | Double-layer anchor net cable supporting structure for controlling mining roadway surrounding rock deformation and method thereof |
| CN107869350A (en) * | 2017-10-25 | 2018-04-03 | 山东科技大学 | A kind of new drop rushes colliery bolting with wire mesh method |
| CN108150208A (en) * | 2018-01-17 | 2018-06-12 | 淮南东华欧科矿山支护设备有限责任公司 | A kind of construction method of tunnel total bolt support |
| CN110470269A (en) * | 2019-08-21 | 2019-11-19 | 山东大学 | Reinforcing laneway prediction scheme is comprehensive to determine method |
| CN110470269B (en) * | 2019-08-21 | 2021-04-16 | 山东大学 | Comprehensive determination method for roadway reinforcement plan |
| CN111894625A (en) * | 2020-08-13 | 2020-11-06 | 高军 | Large-section weak surrounding rock high-prestress anchor rod supporting method and device |
| CN111894625B (en) * | 2020-08-13 | 2022-03-08 | 高军 | Large-section weak surrounding rock high-prestress anchor rod supporting method and device |
| CN112664248A (en) * | 2020-12-25 | 2021-04-16 | 国家能源集团宁夏煤业有限责任公司 | Soft rock water spraying roadway supporting method |
| CN113638756A (en) * | 2021-09-09 | 2021-11-12 | 辽宁工程技术大学 | Anchor cable supporting method for treating roadway floor heave and anchor cable |
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Application publication date: 20130501 |