CN205908296U - Reduce country rock reinforcerment system of rock burst harm - Google Patents
Reduce country rock reinforcerment system of rock burst harm Download PDFInfo
- Publication number
- CN205908296U CN205908296U CN201620629374.4U CN201620629374U CN205908296U CN 205908296 U CN205908296 U CN 205908296U CN 201620629374 U CN201620629374 U CN 201620629374U CN 205908296 U CN205908296 U CN 205908296U
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- China
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- rock
- fiber cloth
- basalt fiber
- anchor pole
- country rock
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Abstract
The utility model provides a reduce country rock reinforcerment system of rock burst harm, includes screed -coat, basalt fiber cloth layer and a plurality of stocks, the screed -coat sets up on the country rock surface, the basalt fiber cloth layer sets up on the screed -coat surface, and a plurality of stocks distribute and implant on the country rock. Implementation method is: in rock mass excavation back, make level to the surperficial wet blasting one deck concrete of country rock, paste the basalt fiber cloth who has high tensile strength along concreted structure rapidly before treating the concrete initial set, then installing anchor, the stock passes basalt fiber cloth and concrete leveling layer plants the rock -entering body, thereby make the country rock, concrete is sprayed, basalt fiber cloth and stock crowd form a country rock reinforcerment system, show the tensile strength who improves the country rock top layer, thereby prevent effectively that the bending of country rock top layer splitting rock plate from being drawn the rupture, and then the emergence of suppression rock burst, or utilize top layer rock plate to take place high -speed launch in order to block that the rock burst fragment is direct to excavation face as the protection shield, reduce rock burst harm from this.
Description
Technical field
This utility model is related to deep underground rock engineering wall rock reinforcing technology, belongs to rock mechanics and engineering technology neck
Domain.
Background technology
With China's foundation engineering construction, HYDROELECTRIC ENERGY exploitation, mine resource exploitation, traffic tunnel engineering, railway construction
Progressively deep (bury and be more than 800m), it will increasing deep underground chamber and Deep-buried Long And Big Tunnels/tunnel work occur
Journey, the deep underground engineering dynamic disaster problem with rock burst as representative increases increasingly, causes grave danger to deep engineering, is system
The critical bottleneck problem of about deep underground engineering Security Construction.
Rock burst is the hard fragility country rock generation ejection property destruction that high-ground stress area is caused due to Underground Engineering Excavation off-load
A kind of geological disaster phenomenon.It is in the excavation off-load of the deep hard brittle rock under three-dimensional stress state, it will lead in rock mass
Portion's stresses re-distribution and elastic strain energy local cluster.When excavating the stress concentration that causes or the country rock being caused by energetic disturbance
When stress exceedes the bearing capacity of rock, country rock will produce violent power destruction, gather the rock block of great number of elastic energy
Gone out with the ejection of speed faster.Rock burst has the sudden of height and randomness it is difficult to Accurate Prediction, and surrounding rock consolidation is
One of most important means of current rock burst prevention and control.
Currently, bolt-spary supports system is most widely used a kind of form during underground rock cavern is reinforced.Cavern excavation
Afterwards, the shotcrete layer applying rapidly and anchor pole can provide certain supporting power from free face for country rock, prevent country rock table
The extensional cracking of layer, and the failure by shear within country rock can be controlled by anchor pole.But, descend engineering practice both at home and abroad in large quantities
Show, bolt-spary supports system is not properly suited for thering is the country rock of strong rock burst tendency under large ground pressure it is difficult to prevent
The only generation of strong rock burst.Main reason is that gunite concrete tensile strength is limited it is difficult to effectively prevent the tensioning of country rock top layer
Splitting forms rock beam, fractures and then lead to the generation of rock burst after rock beam bending tensile.Additionally, the contact between anchor pole is not tight
Close, lead to the weak area between anchor pole to become the breach of rock burst generation so that anchor pole is difficult to play combined supporting effect, lead
Cause anchor pole arrangement density bigger than normal, thereby increase surrounding rock consolidation expense.For this reason, this utility model application has high-tensile spy
The basalt fiber cloth of property is covered in country rock surface, significantly improves the tensile strength on country rock top layer, thus effectively preventing country rock table
Layer splitting rock beam bending tensile fractures, and then suppresses the generation of rock burst, or by the use of top layer rock beam as protection shield to stop rock
Directly there is high speed ejection to excavation face in quick-fried fragment, thus reduce rock burst harm.This system have realize easy, with low cost,
The advantages of high energy absorption capacity, rock burst protection effect are good.
It is extremely strong or strong that the utility model patent for cn101270667a for the application publication number describes a kind of yield of deep-buried cavities
The surrounding rock supporting system of strong or medium rock burst hole section, the mainly density by adjusting anchor pole and anchor cable control different degrees of
Rock burst intensity, when rock burst intensity is high, needs to arrange the larger anchor pole of density and anchor cable, will bring the too high problem of reinforcement cost.
Additionally, the adjustment of the arrangement density of supporting construction depends on the experience of Field Force, execute-in-place difficulty is larger.Further, rock burst
Engineering practice proves, when especially strong rock burst occurs, when bar-mat reinforcement and gunite concrete fully effective can not stop that rock burst occurs
High speed ejection and the rock fragment that goes out.
The utility model proposes the surrounding rock consolidation system that a kind of basalt fiber cloth of rock burst harm is acted on combining anchor,
Absorbing energy when rock burst occurs not only by the change such as deformation and plate folding, thus reducing rock burst grade, and can hinder
When only strong rock burst occurs, high speed rock fragment launches to country rock surface, thus being prevented effectively from or reducing rock burst hazard to people
Member and the security threat of excavation equipment.
Utility model content
The utility model proposes a kind of basalt fiber cloth reducing rock burst harm acts on surrounding rock consolidation system with combining anchor
System, this system mainly improves country rock top layer tensile property by having high-tensile basalt fiber cloth, and effectively strengthens
The weak area of country rock between anchor pole, reaches the generation of suppression rock burst, or by the use of top layer rock beam as protection shield to shield rock
Directly there is the purpose of high speed ejection destruction to excavation face in quick-fried fragment.
To achieve these goals, this utility model employs technical scheme below:
A kind of surrounding rock consolidation system reducing rock burst harm, including screed-coat, basalt fibre layer of cloth and some anchor poles,
Described screed-coat is arranged on country rock surface, and described basalt fibre layer of cloth is arranged on levelling layer surface, and some anchor pole distributions are planted
Enter on country rock.
Further, described screed-coat is gunite concrete, shotcrete or Binder Materials.Screed-coat possesses one
Fixed stickiness, facilitates stickup and the fixation of follow-up basalt fiber cloth.
Further, the thickness of described basalt fiber cloth is 0.5mm, and surface density is 300g/m2.Described basalt
Fiber cloth is with basalt fibre woven fabric as base material, soaks the bidirectional stretch cloth of coating braiding through the anti-emulsion of macromolecule,
There is good alkali resistance, pliability and through broadwise high resistance pulling force.
Further, described anchor pole is to be implanted directly into formula machinery anchor pole.Described anchor pole mainly will be enclosed by frictional force
Rock is fixed, such as reverse wedge formula anchor metal, pipe-seam type anchor rod etc..
Further, described basalt fiber cloth is pasted, and need to carry out in concrete initial set, flattens basalt during stickup
Fiber cloth is allowed to surfaces externally and internally and is all impregnated with by concrete and is close to it is ensured that the tensile characteristics of basalt fiber cloth are fully sent out
Wave.
Further, described anchor pole implantation need to be carried out rapidly after basalt fiber cloth pastes completion, prevents concrete
Solidify in atmosphere, and can successfully basalt fiber cloth be fixed in levelling layer surface, make the basalt after the completion of maintenance
Fiber cloth, anchor pole and country rock form unified overall.
Further, before implantation anchor pole, push the ribbon reserving hole in length and breadth of basalt fiber cloth aside, do bid
Note, is easy to anchor pole implantation, and is unlikely to cut staple cloth.
Compared with prior art, the beneficial effect that this utility model possesses:
It is obviously improved Surrounding Rock Strength, reduce rock burst occurrence risk.The basalt fiber cloth being impregnated with by concrete is in country rock table
Paste on face and concrete curing after the completion of, a stiffness layer is collectively forming with country rock surface due to the glued effect of concrete
Greatly rock beam, is not susceptible to fracture under the anchorage effect of anchor pole, and country rock can put aside more elasticity energy, so that country rock
Intensity is increased dramatically, so reducing the risk of rock burst generation on the whole.
A large amount of elastic strain energies absorbing in rock burst preparation process, are greatly reduced rock burst intensity.Increasing with mining depth
Plus, underground chamber excavates the rock rupture that the high-ground stress that causes leads to will be inevitable, when rock is disturbed load action
When, stress increases further.The rigidity of rock beam ensure that its big energy that will dissipate in snap-off process so that rock burst intensity drops
Low, or even surrounding rock failure form can be made to switch to brittle break by rock burst ejection destruction, reach the effect reducing rock burst harm further
Really.
Country rock surface forms rigid course, stops rock burst ejection from destroying, improves engineering safety coefficient.Traditional country rock adds
Gu system, concrete spray coating can produce substantial amounts of " slungshot " as single surface supporting unit when rock burst occurs, and our
Basalt fiber cloth in face forms the great rock beam of rigidity with country rock surface, and country rock surface is also finer and close, prevents rock burst
During generation, the ejection of fragment and peeling, prevent engineering staff and equipment are worked the mischief.
With low cost, easy construction.The price of basalt fiber cloth be less than bar-mat reinforcement, can directly commercially, and
The prefabricated of bar-mat reinforcement also needs to consume manually, and basalt fiber cloth is easy to hang than bar-mat reinforcement on bonding method.
Rigid flexible system, supporting construction has ductility.Supporting focus on control rock rupture after situation, rather than stop
Rock rupture.The high-strength pulling-resisting characteristic of basalt fiber cloth also absorbs a large amount of country rocks while allowing country rock dilatancy and amasss
The elasticity energy storing, greatly reduces the intensity of rock burst generation.After large deformation, conical anchor rod and friction bolt still possess
Bearing capacity, the tension force on country rock surface is shifted to country rock depths, thus reach coupling hardness with softness, the effect of combined supporting.Additionally,
This supporting construction possesses certain ductility, occurs to win time escape for workmen during rock burst, reduces engineering risk.
Brief description
Fig. 1 is the construction procedure flow chart of the surrounding rock consolidation system reducing rock burst harm described in the utility model；
Fig. 2 is tunnel cross sectional schematic diagram after embodiment completion described in the utility model；
Fig. 3 is utilization true triaxial rockburst testing machine schematic diagram described in the utility model；
Fig. 4 is sample upper bolt layout drawing described in the utility model；
Fig. 5 is the sample photo being mounted with anchor pole in true triaxial rockburst test described in the utility model；
Fig. 6 is sample rock burst destructive process high-speed camera sectional drawing in true triaxial rockburst test described in the utility model；
Fig. 7 is damage -form photo after sample rock burst in true triaxial rockburst test described in the utility model.
In figure:
1. screed-coat；2. basalt fibre layer of cloth；3. sample；4.x cuts somebody's hair to loading；5.z cuts somebody's hair to loading；6. rock sample is opened
Hole；7. pad；8. stop the bending rock beam that rock burst fragment outwards launches；9. nut；10. threaded rod；11. anchor poles.
Specific embodiment
For making the purpose of this utility model, technical scheme become apparent from understanding, below in conjunction with one in Figure of description
Embodiment and the indoor rock burst test of a basalt fiber cloth and combining anchor supporting rock sample, to technology of the present utility model
Scheme is clearly and completely described.
The construction procedure of embodiment is as follows:
Step 101, in the tunnel surrounding surface wet shotcreting screed-coat excavating.
Specifically, by the section configuration tunneling of design, after the completion of excavation, adopt wet-spray technique on tunnel surrounding surface
Gunite concrete screed-coat (can take 30mm thickness).Spraying operation first sprays upwards from arch springing or corner, gunite concrete surface
Should substantially flat and state of trickling in moistening no dry spot or sliding.Screed-coat plays closing country rock, fills up wall-rock crack, prevents and treats and enclose
The effect that rock air slaking and surface crag collapse.
Step 102, rapid stickup basalt fiber cloth before the initial set of concrete leveling layer.
Specifically, basalt fiber cloth cut growth is slightly over the value of Tunnel Design section girth, a width of 5 meters of square
Shape cloth (width can also be that other can be beneficial to on-site cutting and the value of arrangement), along the paving one by one of tunnel piercing direction.Paste
When, compression basalt fiber cloth is allowed to be impregnated with by cement mortar it is ensured that the high-strength pulling-resisting characteristic of basalt fiber cloth and concrete
In conjunction with being not fully exerted after integral, and the lap of splice between adjacent rectangle basalt fiber cloth is not less than 300mm.
Step 103, pastes in basalt fiber cloth and completes and implantation anchor pole rapid on the country rock after concrete initial set.
Specifically, implant anchor pole using roof-bolter, the spacing between anchor pole will meet the support density of design requirement, and
Less than 2m.Basalt fiber cloth lap-joint must have anchor pole to implant, and increases anchor pole implant density in this region.Note
Before implantation anchor pole, push the ribbon reserving hole in length and breadth of basalt fiber cloth aside, make a mark, be easy to anchor pole implantation, and
It is unlikely to cut staple cloth.Anchor pole implantation direction is tried one's best vertical with strata structure face.Make basalt fiber cloth by the support on anchor pole
Disk is pushed down, and is close on country rock it is ensured that the integrity of the support system being made up of concrete, basalt fiber cloth, anchor pole.
Additionally, the laboratory test checking embodiment of basalt fiber cloth and combining anchor supporting effect is as follows:
Occurred under conditions of anchor pole and basalt fibre combined supporting come simulation rock using true triaxial pressure testing machine
Rock burst or brittle break process, comprise the following steps:
1) rock sample preparation: rock sample is middle coarse grain red granite, takes from Guangxi Zhuang Autonomous Region Wuzhou Cenxi county.Rock
Sample density is about 2607kg/m3, average uniaxial compressive strength is about 120mpa, and under room temperature, longitudinal wave velocity is about 5.2km/s, completely
Property and uniformity are preferable.
2) rock sample processing: perforate direction is perpendicular to specimen surface, opening diameter 8mm, perforate depth 75mm ± 2mm.Perforate
Carry out again afterwards cutting, polish, the specimen size after machine-shaping is 200mm × 100mm × 100mm, perforate is located at specimen surface
Center, machining accuracy strictly presses the execution of International Rock mechanics association criterion.Anchor pole arrangement on sample is as shown in Figure 4.
3) implant anchor pole: from threaded rod and corresponding nut and square washer simulation anchor pole, make using cement mortar
For cementing agent, threaded rod is binded in reserving hole.Described anchor pole adopts the hrb300 level threaded rod of a diameter of 6mm；Described
Pallet dimension be 30mm × 30mm × 2.5mm, described nut is 4.8 grades of zinc-plated hex nuts for 6mm for the internal diameter；Duct is adopted
It is in the milk with cement mortar.
4) paste basalt fiber cloth: cement mortar is equably applied on the scar having implanted anchor pole, then pastes one
Layer and scar basalt fiber cloth in the same size, flatten basalt fiber cloth and are allowed to be impregnated with by cement mortar, reuse nut handle
Square washer is fixed on fiber cloth surface, and maintenance is no less than seven days under the conditions of suitable temperature and humidity.Actual maintenance is complete
The assay maps becoming is as shown in Figure 5.
5) install: the sample that maintenance is completed is placed in true triaxial test machine and carries out rock burst experiment.Using true triaxial test
The schematic diagram that machine carries out rock burst experiment is as shown in Figure 3.
6) load: experiment (faces sky using the load mode of " five face stress-one side faces empty-axially loaded ", i.e. y-axis direction
In the face of facade) minimum principal stress and x-axis direction intermediate principal stress be loaded into certain value after keep constant, according to certain plus
Carry speed and gradually apply the load of biggest principal stress direction until there is rock burst.The σ x of this experiment takes 30mpa, σ y to take 5mpa, σ z
The loading speed of direction load is 0.5mpa/s.
The rock burst destructive process of sample is as shown in Figure 6.
After experiment, the damage -form figure of sample is as shown in Figure 7.
Can be drawn by Fig. 7 and experimental data: first, the outermost rock mass of free face and fiber cloth are combined into a rigidity very
Big rock beam, prevents the ejection to free face for the fragment.Secondly, although rock beam bending, peeling is not had to get off, and in bending
When absorb substantial amounts of elasticity can, can be seen that from sample side and do not form the shearing crack running through, after rock burst sample is relatively
Completely, rock burst intensity substantially reduces.Finally, from experimental data gained, the intensity of country rock is increased dramatically.
Claims (7)
- If a kind of reduce rock burst harm surrounding rock consolidation system it is characterised in that include screed-coat, basalt fibre layer of cloth and Dry root anchor pole, described screed-coat is arranged on country rock surface, and described basalt fibre layer of cloth is arranged on levelling layer surface, some anchors Bar is implanted on country rock.
- 2. the surrounding rock consolidation system reducing rock burst harm as claimed in claim 1 is it is characterised in that described screed-coat is spray Penetrate concrete, shotcrete or Binder Materials.
- 3. the surrounding rock consolidation system reducing rock burst harm as claimed in claim 1 is it is characterised in that described basalt fibre The thickness of cloth is 0.5mm, and surface density is 300g/m2.
- 4. the surrounding rock consolidation system reducing rock burst harm as claimed in claim 1 is it is characterised in that described anchor pole is direct Implanted machinery anchor pole.
- 5. the surrounding rock consolidation system reducing rock burst harm as claimed in claim 1 is it is characterised in that described basalt fiber cloth Stickup, need to carry out in concrete initial set, flatten basalt fiber cloth during stickup and be allowed to surfaces externally and internally and be all impregnated with by concrete And be close to it is ensured that the tensile characteristics of basalt fiber cloth are not fully exerted.
- 6. the surrounding rock consolidation system reducing rock burst harm as claimed in claim 1 is it is characterised in that described anchor pole implantation needs Carry out rapidly after basalt fiber cloth pastes completion, prevent concrete from solidifying in atmosphere, and can be successfully fine by basalt Wei Bu is fixed in levelling layer surface, so that the country rock after the completion of maintenance, basalt fiber cloth and anchor pole is formed unified overall.
- 7. as claimed in claim 1 reduce rock burst harm surrounding rock consolidation system it is characterised in that implantation anchor pole before, Push the ribbon reserving hole in length and breadth of basalt fiber cloth aside, make a mark, be easy to anchor pole implantation, and be unlikely to cut staple Cloth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620629374.4U CN205908296U (en) | 2016-06-22 | 2016-06-22 | Reduce country rock reinforcerment system of rock burst harm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620629374.4U CN205908296U (en) | 2016-06-22 | 2016-06-22 | Reduce country rock reinforcerment system of rock burst harm |
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| CN205908296U true CN205908296U (en) | 2017-01-25 |
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| CN201620629374.4U Expired - Fee Related CN205908296U (en) | 2016-06-22 | 2016-06-22 | Reduce country rock reinforcerment system of rock burst harm |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927244A (en) * | 2016-06-22 | 2016-09-07 | 广西大学 | Surrounding rock consolidation system for reducing rock burst hazards |
-
2016
- 2016-06-22 CN CN201620629374.4U patent/CN205908296U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927244A (en) * | 2016-06-22 | 2016-09-07 | 广西大学 | Surrounding rock consolidation system for reducing rock burst hazards |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170125 Termination date: 20190622 |