CN108005696B - Anchor net beam truss support method in high stress tunnel - Google Patents
Anchor net beam truss support method in high stress tunnel Download PDFInfo
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- CN108005696B CN108005696B CN201711336343.5A CN201711336343A CN108005696B CN 108005696 B CN108005696 B CN 108005696B CN 201711336343 A CN201711336343 A CN 201711336343A CN 108005696 B CN108005696 B CN 108005696B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 239000011435 rock Substances 0.000 claims abstract description 30
- 239000003245 coal Substances 0.000 claims abstract description 23
- 230000002787 reinforcement Effects 0.000 claims abstract description 11
- 239000000725 suspension Substances 0.000 claims abstract description 8
- 239000002023 wood Substances 0.000 claims abstract description 7
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 210000003205 muscle Anatomy 0.000 claims description 10
- 239000003814 drug Substances 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001687 destabilization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
Present invention relates particularly to a kind of anchor net beam truss support methods in high stress tunnel；The following steps are included: a, initial supporting, form complete country rock body surface control system as initial supporting b, secondary reinforcement supporting using bolting with wire mesh form to top side after blowing out, anchor cable steel I-beam reinforcement supporting lags behind suspension roof support 10m；C, beacon is installed, in 85m ~ 105m with coal column concentrated stress release area is covered on Burst Tendency, installs row's wood point column as beacon away from 2000mm by column in lane；The present invention helps coal and rock exposed between taking the comprehensive surface control system of anchor net beam truss support form composition to make anchor pole (rope) to be protected on top, improves the integral strength of anchor pole bearing structure, and forms secondary bearing structure control relaxation zone development；The prestress anchorage cable lag of secondary supporting is installed, and the high stress of country rock is made to be adjusted and discharge, and steel strand wires overload is avoided to break；Wood point column is added in the location with Burst Tendency to increase the sense of security of people.
Description
Technical field
The present invention relates to coal-mining technique fields, and in particular to a kind of anchor net beam truss support method in high stress tunnel.
Background technique
The stability of roadway surrounding rock depends mainly on the mechanical characteristics of country rock.If selection prop characteristic and enclose
The mechanical characteristic of rock deformation matches, and supporting can be tightly combined with country rock, reinforces country rock, plays country rock itself to greatest extent
Bearing capacity, deformation controlling for rock surrounding gateways promote stability of the roadway.Conversely, supporting failure may occur, and wall rock destabilization, tunnel leakage top.
" long anchor cables such as isometric anchor pole+mono- supporting plate " of routine used in coal mine at present, and require anchor cable to closely follow together with anchor pole and meet head on, such as
Fruit causes wall caving to make the deficiency of wall rock geology environmental awareness locating for tunnel, this support pattern because meeting stress discharges bored pier sound of movement
Tunnel ultra-wide is serious, adds top board surface Instability of Rock Body, the zero skin avalanche of anchor pole gap, and the failure of anchor pole anchor sky causes leakage to push up.
Summary of the invention
The present invention is to solve existing method for protecting support to occur the zero skin avalanche of anchor pole gap in high stress tunnel, and anchor pole anchor sky loses
The technical issues of effect causes leakage to push up provides a kind of anchor net beam truss support method in high stress tunnel.
In order to solve the above technical problems, the technical scheme adopted by the invention is as follows: anchor net beam purlin in a kind of high stress tunnel
Frame method for protecting support, comprising the following steps:
A, initial supporting forms complete country rock body surface control system using bolting with wire mesh form to top side after blowing out and makees
For initial supporting,
Top plate: array pitch is 0.5m × 0.9m in the upper coal column stress-concentrated area that covers between suspension roof support；Other stressed zone 0.8m ×
0.9m；It is located in the middle the left-handed nothing of 20MnSi that top anchor pole specification is φ 20mm × 2200mm and indulges muscle twisted steel anchor rod, Qi Tading
The left-handed nothing of 20MnSi that anchor pole specification is φ 20mm × 1800mm indulges muscle twisted steel anchor rod；Select high-intensitive button pad pallet, specification
For 100mm × 100mm × 10mm；Anchorage length 900mm；Pretightning force is not less than 70KN；Joist selects W steel belt plate, and specification is
3200mm×220mm×3mm；Net uses the diamond mesh of 1500mm × 2000mm, and mesh specification is 50mm × 50mm；
Lane side: the side of non-producing muscle twisted steel anchor rod, array pitch 1000mm are indulged using the left-handed nothing of φ 18mm × 2000mm
× 1000mm, two rows are set in three figured cloths, use metal rhombus net；
Exploit side use glass fibre reinforced plastics rockbolts, specification be φ 18mm × 2000mm, array pitch 1000mm × 1000mm, up and down
Two rows are set in three figured cloths；Plastic-steel tray φ 200mm, thickness 50mm, plastic wire specification 1500mm × 2000mm, mesh specification
50mm×50mm；
B, secondary reinforcement supporting, anchor cable steel I-beam reinforcement supporting lag behind suspension roof support 10m；Driving 10m is pushed up again
Plate increases the secondary reinforcement supporting for playing anchor cable；The every arrangement of anchor cable sets 3, and joist uses 11# steel I-beam, spacing 2000mm, arrangement
Between two rows of anchor poles, first anchor-hold 80KN, resin medicine anchorage length 1200mm；Steel strand wires specification is φ 17.8mm × 4500mm,
Intermediate 5500mm, two sides pallet use 60mm × 80mm × 10mm metal plain cushion, and centre uses button pad arch tray；Tunnel two sides
The oblique lane side of two sides anchor cable of vertex protrudes into lane side with 65 ° of horizontal direction angle；
C, beacon is installed, area is discharged with coal column concentrated stress is covered on Burst Tendency in 85m ~ 105m, in lane
Row's wood point column is installed as beacon away from 2000mm by column；Point column wants Zhi Zhizhi firm, with timber wedge wedging.
Anchor girder net truss support form group is taken in time for the top of soft rock composite layer top plate, coal column high stress tunnel, side
At comprehensive surface control system, the integral strength of anchor pole bearing structure is improved, is conducive to the heavily stressed diffusion transfer of country rock, allows
Rockbolt stress tends to be uniform.Meanwhile the shield table of weir acts on coal and rock exposed between making anchor pole again and is protected, and forms secondary
Bearing structure avoids anchor pole anchor sky from failing to control relaxation zone development.
Suspension roof support is that have larger yieldable active support, and country rock initial stage can be effectively reduced by improving installation pretightening force
Deflection is conducive to the stabilization in tunnel.
The prestress anchorage cable of secondary supporting should be lagged and be installed, and to be adjusted the high stress of country rock and to discharge, be avoided
Steel strand wires overload is broken.It is to be noted that node should be chosen according to site operation actual conditions, if too late supporting may
Can because deflection is excessive, tunnel unstability due to lose secondary supporting opportunity.
Bolt and cable anchor supporting is close to be should ensure that for soft rock composite layer top plate island working face, coal column stress-concentrated area location
Degree, prevent from causing outer layer coal and rock to burst apart because gap is excessive, absciss layer due to make to combine bearing structure strength reduction and tunnel unstability occur.
Arcuation shape is generally for back inbreak rule, it should be especially by middle part anchor pole (rope) when carrying out design of its support
Design of length compared with two side lengths a little to avoid same rock stratum face occur failure by shear.
Anchor pole, anchor cable are concealed work, the supervision of Yao Jiaqiang routine quality and supervision and check.In addition, in coal column concentrated stress
One row's wood point column of branch is mended in section lane, is on the one hand prevented accident as beacon, on the other hand can be increased the safety of people
Sense.
Compared with prior art the invention has the following advantages:
Anchor net beam truss support method takes anchor net beam truss support form to form in top side in high stress tunnel of the present invention
Comprehensive surface control system protects exposed coal and rock between anchor pole (rope), mentions the integral strength of anchor pole bearing structure
Height, and form secondary bearing structure control relaxation zone development.The prestress anchorage cable lag of secondary supporting is installed, and the height of country rock is answered
Power is adjusted and discharges, and steel strand wires overload is avoided to break.Extension design is carried out to avoid in same rock to middle part anchor pole (rope)
Level occurs failure by shear and leakage is caused to be pushed up.Wood point column is added in the location with Burst Tendency to increase the sense of security of people.
Detailed description of the invention
Fig. 1 is to protect cross-section diagram using the ramus ophthalmicus of cutting of method for protecting support of the present invention.
Fig. 2 is embodiment roof delamination observed result figure.
Fig. 3 is embodiment surface displacement observed result figure.
It is marked in figure as follows:
1- anchor cable, 2- beacon.
Specific embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
Datong Coal Group Company consanguinity Liang Kuang is shown in along 14-3# layers of coal jacks up bottom, perforating charge explosion driving, rectangular cross section: wide × high=
4000mm×2000mm.Coal thickness 1300mm ~ 1450mm, directly top are that Extra-fine sand rock contains carbonaceous, horizontal bedding, thickness 1500mm；
Old top is Extra-fine sand rock, thin layer columnar structure, horizontal bedding development, thickness 4080mm, containing 14-2# layers of coal.
For the island working face of soft rock Compound Roof, Surrounding Rock Strength is low, and stress is high, and deflection is big.Along with above covering
Coal column concentrated stress causes the difficulty of supporting larger with the dynamic release of construction between stopping the face of adopting, take following method for protecting support into
Row supporting the following steps are included:
A, initial supporting forms complete country rock body surface control system using bolting with wire mesh form to top side after blowing out and makees
For initial supporting,
Top plate: array pitch is 0.5m × 0.9m in the upper coal column stress-concentrated area that covers between suspension roof support；Other stressed zone 0.8m ×
0.9m；It is located in the middle the left-handed nothing of 20MnSi that top anchor pole specification is φ 20mm × 2200mm and indulges muscle twisted steel anchor rod, Qi Tading
The left-handed nothing of 20MnSi that anchor pole specification is φ 20mm × 1800mm indulges muscle twisted steel anchor rod；Select high-intensitive button pad pallet, specification
For 100mm × 100mm × 10mm；Anchorage length 900mm；Pretightning force is not less than 70KN；Joist selects W steel belt plate, and specification is
3200mm×220mm×3mm；Net uses the diamond mesh of 1500mm × 2000mm, and mesh specification is 50mm × 50mm；
Lane side: the side of non-producing muscle twisted steel anchor rod, array pitch 1000mm are indulged using the left-handed nothing of φ 18mm × 2000mm
× 1000mm, two rows are set in three figured cloths, use metal rhombus net；
Exploit side use glass fibre reinforced plastics rockbolts, specification be φ 18mm × 2000mm, array pitch 1000mm × 1000mm, up and down
Two rows are set in three figured cloths；Plastic-steel tray φ 200mm, thickness 50mm, plastic wire specification 1500mm × 2000mm, mesh specification
50mm×50mm；
B, secondary reinforcement supporting, anchor cable steel I-beam reinforcement supporting lag behind suspension roof support 10m；Driving 10m is pushed up again
Plate increases the secondary reinforcement supporting for playing anchor cable；The every arrangement of anchor cable sets 3, and joist uses 11# steel I-beam, spacing 2000mm, arrangement
Between two rows of anchor poles, first anchor-hold 80KN, resin medicine anchorage length 1200mm；Steel strand wires specification is φ 17.8mm × 4500mm,
Intermediate 5500mm, two sides pallet use 60mm × 80mm × 10mm metal plain cushion, and centre uses button pad arch tray；Tunnel two sides
The oblique lane side of two sides anchor cable of vertex protrudes into lane side with 65 ° of horizontal direction angle；
C, beacon is installed, area is discharged with coal column concentrated stress is covered on Burst Tendency in 85m ~ 105m, in lane
Row's wood point column is installed as beacon away from 2000mm by column；Point column wants Zhi Zhizhi firm, with timber wedge wedging.
In step a, the left-handed nothing of 20MnSi that intermediate top anchor pole specification is φ 20mm × 2200mm indulges muscle twisted steel anchor rod.
In step a, roof timbering uses resin medicine, and resin medicine used is K2330 and Z2360 using specification.
Roof delamination observation:
Separation indicator arranges 2 measuring points in the borehole, and 1 is arranged in away from the depths top plate 1.8m, another is arranged in away from top plate
5.5m depths.3 are arranged altogether, install one at a tunneling direction 60m along cutting, one is installed at 100m, one is installed at 140m.
Observed result is as shown in Figure 2.
The result shows that: about when excavating 30d, absciss layer amount reaches maximum value 30mm at 1#, 3# measuring point, above covers coal column and answers
The 2# measuring point of power concentration zones absciss layer amount when excavating 30d reaches maximum value 80mm.
Because the engineering elongation percentage of anchor pole larger (13% or so) belongs to flexible support, only maximum to the steel strand wires of rigid protection
Elongation is allowed to be checked:
According to formula △ L >=(1.8-Fy/221) % × L
△ L --- --- free section of anchor cable elongation Fy --- --- anchor cable pretightning force, KN
L --- --- free section of anchor cable length
Substitute into numerical value △ L >=(1.8-80/221) % × 4300=62mm
And anchor cable buckles pad pallet and deflection is allowed to be about 30mm, so the practical maximum deformation quantity allowed of steel strand wires is 30
+ 62=92mm, in addition anchor cable installation front top plate has the first deflection of 20 ~ 30mm or so, Gu Maosuomaoguchu after tunnel initating
The maximum allowable deflection of top plate can achieve 110 ~ 120mm or so steel strand wires and will not be broken.
Known to observation data from the graph: the maximum allowable deflection 110mm of top plate maximum absciss layer amount 80mm < steel strand wires ~
120mm, supporting are safe and effective.
Surface displacement observation:
Surface displacement observation is carried out using " right-angled intersection " method, altogether 3 survey stations of laying, at respectively 50m, at 90m, 130m
Place, continuous observation 30d, two help to be 10 ~ 20mm with respect to amount of convergence, and roof and floor is 20 ~ 80mm with respect to amount of convergence.Observed result is as schemed
Shown in 3, from the point of view of illustrating observed result, the surface displacement in the non-coal column section tunnel that 1#, 3# curve indicate is smaller, and 2# curve indicates
Stress of coal pillar concentration zones two help opposite amount of convergence 20mm., roof to floor convergence maximum reaches 80mm, but also allows in supporting
Deformation range within.
Claims (2)
1. a kind of anchor net beam truss support method in high stress tunnel, which comprises the following steps:
A, initial supporting forms complete country rock body surface control system as just using bolting with wire mesh form to top side after blowing out
Beginning supporting,
Top plate: array pitch is 0.5m × 0.9m in the upper coal column stress-concentrated area that covers between suspension roof support；Other stressed zone 0.8m × 0.9m；
It is located in the middle the left-handed nothing of 20MnSi that top anchor pole specification is φ 20mm × 2200mm and indulges muscle twisted steel anchor rod, other top anchor pole rule
The left-handed nothing of 20MnSi that lattice are φ 20mm × 1800mm indulges muscle twisted steel anchor rod；Select high-intensitive button pad pallet, specification 100mm
×100mm×10mm；Anchorage length 900mm；Pretightning force is not less than 70KN；Joist select W steel belt plate, specification be 3200mm ×
220mm×3mm；Net uses the diamond mesh of 1500mm × 2000mm, and mesh specification is 50mm × 50mm；
Lane side: the side of non-producing using the left-handed nothing of φ 18mm × 2000mm indulge muscle twisted steel anchor rod, array pitch 1000mm ×
1000mm, two rows are set in three figured cloths, use metal rhombus net；
It exploits side and uses glass fibre reinforced plastics rockbolts, specification is φ 18mm × 2000mm, array pitch 1000mm × 1000mm, upper and lower two
Row, sets in three figured cloths；Plastic-steel tray φ 200mm, thickness 50mm, plastic wire specification 1500mm × 2000mm, mesh specification 50mm
×50mm；
B, secondary reinforcement supporting, anchor cable steel I-beam reinforcement supporting lag behind suspension roof support 10m；Driving 10m carries out top plate increasing again
Play the secondary reinforcement supporting of anchor cable；The every arrangement of anchor cable sets 3, and joist uses 11# steel I-beam, and spacing 2000mm is arranged in two
It arranges between anchor pole, first anchor-hold 80KN, resin medicine anchorage length 1200mm；Steel strand wires specification is φ 17.8mm × 4500mm, intermediate
5500mm, two sides pallet use 60mm × 80mm × 10mm metal plain cushion, and centre uses button pad arch tray；Tunnel two sides apex angle
The oblique lane side of two sides anchor cable at place protrudes into lane side with 65 ° of horizontal direction angle；
C, beacon is installed, in 85m ~ 105m with coal column concentrated stress release area is covered on Burst Tendency, column is pressed in lane
Row's wood point column is installed as beacon away from 2000mm；Point column wants Zhi Zhizhi firm, with timber wedge wedging.
2. according to anchor net beam truss support method in a kind of high stress tunnel described in claim 1, it is characterised in that: in step a,
Roof timbering uses resin medicine, and resin medicine used is K2330 and Z2360 using specification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711336343.5A CN108005696B (en) | 2017-12-14 | 2017-12-14 | Anchor net beam truss support method in high stress tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711336343.5A CN108005696B (en) | 2017-12-14 | 2017-12-14 | Anchor net beam truss support method in high stress tunnel |
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| Publication Number | Publication Date |
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| CN108005696A CN108005696A (en) | 2018-05-08 |
| CN108005696B true CN108005696B (en) | 2019-09-20 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108661677A (en) * | 2018-05-09 | 2018-10-16 | 山西交科桥梁隧道加固维护工程有限公司 | A kind of W steel band of model anchor pole composite entity support structures reinforced for tunnel-liner |
| CN110500127B (en) * | 2019-07-19 | 2020-12-15 | 山东科技大学 | Dynamic treatment method for preventing non-uniform settlement of roof in roof cutting roadway without coal pillars |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121389A (en) * | 2010-06-02 | 2011-07-13 | 中国矿业大学(北京) | Method for preventing and treating roof falling and side collapsing of coal roadway surrounding rock by anchor rope truss |
| CN102817620A (en) * | 2012-08-13 | 2012-12-12 | 大同煤矿集团有限责任公司 | Method for supporting ultra-thick and fluffy coal roadway |
| CN102926768A (en) * | 2012-11-15 | 2013-02-13 | 华北科技学院 | Roadway support truss and mounting method thereof |
| CN102979542A (en) * | 2012-12-11 | 2013-03-20 | 安徽恒源煤电股份有限公司 | Bolt-mesh-cable support technology |
| CN205117366U (en) * | 2015-07-27 | 2016-03-30 | 山西潞安矿业(集团)有限责任公司 | Supporting device is encircleed to two pressure -bearings of big soft broken coal road of section |
| CN106567721A (en) * | 2016-11-04 | 2017-04-19 | 大同煤矿集团有限责任公司 | High prestressed anchor cable truss support method |
-
2017
- 2017-12-14 CN CN201711336343.5A patent/CN108005696B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121389A (en) * | 2010-06-02 | 2011-07-13 | 中国矿业大学(北京) | Method for preventing and treating roof falling and side collapsing of coal roadway surrounding rock by anchor rope truss |
| CN102817620A (en) * | 2012-08-13 | 2012-12-12 | 大同煤矿集团有限责任公司 | Method for supporting ultra-thick and fluffy coal roadway |
| CN102926768A (en) * | 2012-11-15 | 2013-02-13 | 华北科技学院 | Roadway support truss and mounting method thereof |
| CN102979542A (en) * | 2012-12-11 | 2013-03-20 | 安徽恒源煤电股份有限公司 | Bolt-mesh-cable support technology |
| CN205117366U (en) * | 2015-07-27 | 2016-03-30 | 山西潞安矿业(集团)有限责任公司 | Supporting device is encircleed to two pressure -bearings of big soft broken coal road of section |
| CN106567721A (en) * | 2016-11-04 | 2017-04-19 | 大同煤矿集团有限责任公司 | High prestressed anchor cable truss support method |
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