CN209115122U - A kind of strong rock burst section tunnel support structure - Google Patents

A kind of strong rock burst section tunnel support structure Download PDF

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Publication number
CN209115122U
CN209115122U CN201821822000.XU CN201821822000U CN209115122U CN 209115122 U CN209115122 U CN 209115122U CN 201821822000 U CN201821822000 U CN 201821822000U CN 209115122 U CN209115122 U CN 209115122U
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China
Prior art keywords
tunnel
rock burst
support structure
burst section
concrete layer
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CN201821822000.XU
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Inventor
朱胥仁
苗永旺
王勇
刘金松
朱生宪
郑宗溪
胖涛
张广泽
张维
强新刚
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China Railway Qinghai Tibet Group Co Ltd
First Engineering Co Ltd of China Railway No 5 Engineering Group Co Ltd
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China Railway Qinghai Tibet Group Co Ltd
First Engineering Co Ltd of China Railway No 5 Engineering Group Co Ltd
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  • Lining And Supports For Tunnels (AREA)

Abstract

The utility model discloses a kind of strong rock burst section tunnel support structures, first stir cement and soft soil in deep ground layer, profile steel frame, steel mesh and multiple pneumatically placed concrete layer including being set in turn in tunnel wall surface, and the expansion shell type prestressing force hollow bolt in insertion tunnel surrounding, tunnel tunnel face have multiple advanced stress holes for protruding into country rock along arch wall outline excavation perimeter line is circumferentially disposed.The utility model has applied just stir cement and soft soil in deep ground layer, profile steel frame, steel mesh and multiple pneumatically placed concrete layer in tunnel from outside to inside, to form the supporting construction of rigid flexible system, be conducive to the release of stress, guarantee the intensity of support system, the integer support ability for improving structure, prevents sillar from launching or peeling off suddenly;Tunnel radial direction expansion shell type prestressing force hollow bolt, tunnel longitudinal direction advance anchor bolt play the role of reinforcing country rock and inhibit rock burst;The circumferential advanced stress relief hole in tunnel discharges surrouding rock stress in advance, inhibits and reduce rock burst.

Description

A kind of strong rock burst section tunnel support structure
Technical field
The utility model belongs to technical field of tunnel construction more particularly to a kind of strong rock burst section tunnel support structure.
Background technique
The method of the tunnel Sang Zhuling Prediction for Rock Burst is mainly secondary according to field geology situation combination hole wall after tunnel excavation Actual Stress Measurement data predict rock burst.It is maximum tangential when stress release 100% after tunnel excavation according to field measurement data Stress σθAnd maximum principal stress σ1Value respectively reach 75.54MPa and 74.85MPa, judge that front has strong violent rock burst.Rock Quick-fried serious location, with the phenomenon that collapses, security risk is very big, can safety to on-site personnel and machine security cause pole Risks, quick-fried hole that rock burst generates, backbreak, collapse and supporting after secondary happening part, must be at specially treated or even shut-down Reason, seriously affects construction speed.Patent 201621026240.X discloses a kind of high-ground stress tunnel support structure, from inside to outside It sets gradually self-advancing type hollow bolt, bubble concrete layer, splash guard, thicken concrete layer, be equipped at face and answer in advance Power relief hole, setting self-advancing type hollow bolt can according to crustal stress situation appropriate adjustment grouting parameter, bubble concrete layer and plus Thick concrete layer forms soft inside despite one's hard shell Composite Supporting System, can preferably adapt to the supporting in high-ground stress tunnel, and centre is also set There is splash guard, guarantee the integral waterproofing effect in tunnel, on the one hand the advanced crustal stress relief hole at face guarantees work progress On the other hand safety reduces crustal stress to the load of supporting construction;It is obvious with structure, the advantage of work progress simplicity. 201621321725.1 disclose a kind of anti-rock burst support system in tunnel, and including being set in turn in the wall surface to supporting tunnel One concrete layer, steel mesh and the second concrete layer and be set in the drilling to supporting tunnel by tunnel wall apply diameter The expansion shell type prestressed anchor of active support is carried out to power, steel mesh is connected to expansion shell type prestressed anchor, and the second coagulation Steel mesh is covered in the surface of the first concrete layer by soil layer.The anti-rock burst support system in the tunnel can effectively reduce tunnel support The generation of safety accident in the process.But above-mentioned patent is applied to strong acutely rock burst section tunnel support, however it remains supporting is strong Spend it is low, supporting fail the problem of.
Utility model content
The application aims to solve at least one of the technical problems existing in the prior art.For this purpose, the purpose of this utility model One of be to provide a kind of supporting intensity high strong rock burst section tunnel support structure.
In order to solve the above technical problems, strong rock burst section tunnel support structure provided by the utility model, including successively set It is placed in first stir cement and soft soil in deep ground layer, steel mesh, profile steel frame and the multiple pneumatically placed concrete layer of tunnel wall surface, and insertion tunnel encloses Expansion shell type prestressing force hollow bolt in rock, tunnel tunnel face have multiple protrude into enclose along arch wall outline excavation perimeter line is circumferentially disposed The advanced stress hole of rock.
Further, tunnel tunnel face has multiple advanced anchors for protruding into country rock along arch outline excavation perimeter line is circumferentially disposed Bar.
Further, tunnel tunnel face is equipped with advanced glass fibre anchor pole row's group of multiple rows of interlaced arrangement up and down, each super The anchorage length of front glass fiber anchor rod is 2 times of explosion advanced depths.
Further, the CF25 steel fiber concrete layer that just stir cement and soft soil in deep ground layer uses with a thickness of 5cm.
Further, the expansion shell type prestressing force hollow bolt submits wrong arrangement in tunnel wall surface.
Further, the longitudinal pitch of the shaped steel arch is 1m, and the multiple pneumatically placed concrete layer uses C25 concrete layer.
Compared with prior art, the utility model has the following beneficial effects:
1, first stir cement and soft soil in deep ground layer, steel mesh, profile steel frame and multiple pneumatically placed concrete layer constitute the branch of rigid flexible system Protection structure improves the integer support ability of structure, prevents sillar from launching or peeling off suddenly, is conducive to the release of stress, guarantees branch The intensity of watch box system, it is ensured that tunnel safety operation.Expansion shell type prestressing force hollow bolt is performed after excavation in time, rapidly change due to Tunnel cavern excavation and caused by stress of cavern wall state, partially restore its radial stress constraint, in time provide supporting drag, effectively Inhibit and reduce rock burst generation, development, weakens rock burst extent of the destruction.
2, circumferentially disposed advance anchor bolt can provide supporting drag in time, change surrouding rock stress state, make surrouding rock stress shape State turns to three-dimensional space stress state from plane stress state quickly, plays the role of reinforcing country rock and inhibits rock burst;This Outside, advance anchor bolt can also play anchorage effect in time, and anchor lives early stage rock burst chip off-falling, landslide, and over time, anchoring ability increases By force, reach anchor force needed for preventing rock burst landslide.
3, weak blast is carried out to country rock presplitting using advanced stress hole, discharge stress in advance, to face periphery after excavation Country rock carries out watering softening, further discharges stress, hence it is evident that reducing rock burst influences, and improves construction environment, makes constructing tunnel quality It is fully protected with safety.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of utility model;
Fig. 2 is the construction process schematic diagram of utility model.
Specific embodiment
The utility model is further described below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, in one embodiment, strong rock burst section tunnel support structure, including being set in turn in tunnel wall surface The shell that rises in first stir cement and soft soil in deep ground layer 1, steel mesh 2, profile steel frame 3 and multiple pneumatically placed concrete layer 4, and insertion tunnel surrounding Formula prestressing force hollow bolt 5, tunnel tunnel face along arch wall outline excavation perimeter line it is circumferentially disposed have multiple protrude into the advanced of country rock Stress hole 6, steel mesh 2 are laid on the surface of first stir cement and soft soil in deep ground layer 1.
The first stir cement and soft soil in deep ground layer 1 of the present embodiment, profile steel frame 2, steel mesh 3 and multiple pneumatically placed concrete layer 4 form interior soft Outer rigid supporting construction, is conducive to the release of stress, guarantees the intensity of support system, it is ensured that tunnel safety operation.Using the shell that rises Formula prestressing force hollow bolt 5 carries out active support to tunnel wall, at the beginning of having constructed behind stir cement and soft soil in deep ground layer 1, in just spray steel 1 surface of fiber concrete layer needs to install the position drilling of anchor pole, and drilling extends to country rock through first stir cement and soft soil in deep ground layer 1 In, shell-type prestressing force hollow bolt 5 is installed in drilling, radial force is applied to palisades by country rock and carries out active support.It excavates The expansion shell type prestressing force hollow bolt performed in time afterwards, can rapidly change as tunnel cavern excavation and caused by stress of cavern wall State partially restores the constraint of its radial stress, timely to provide supporting drag, effectively inhibits and reduces rock burst generation, development, weaken Rock burst extent of the destruction.Weak blast is carried out to country rock presplitting using advanced stress hole 6, discharges stress in advance, to face after excavation Peripheral rock carries out watering softening, further discharges stress, can be substantially reduced rock burst influence, improve construction environment, make tunnel Construction quality and safety are fully protected.
After removing the loosening stone that arch crown part is generated due to rock burst, gunite concrete covering rock is first applied before muck removal Quick-fried hole.Gunite concrete, which has, weakens rock burst effect, for protecting the safety of construction personnel and equipment, to prevent between anchor pole Carg flies out, and the fritter stone for not removing clean is bonded together, is hurted sb.'s feelings in order to avoid falling.In addition whether observable rock burst is gone back Continue to develop.Steel fiber reinforced concrete has the flexibility more much bigger than normal concrete, is able to bear moderate finite deformation without making surface Cracking.
It is envisioned that in actual design, tunnel tunnel face along arch outline excavation perimeter line it is circumferentially disposed have it is more A advance anchor bolt 7 for protruding into country rock, specifically, advance anchor bolt 7 and advanced stress hole 6 and tunnel are longitudinally in a certain angle and to arch Extend on the outside of wall outline excavation perimeter line.Advance anchor bolt hole is beaten to play the role of release or weaken face surrouding rock stress;It adopts Supporting drag can be provided in time with strong anchor pole of advanced morning, changed surrouding rock stress state, made surrouding rock stress state quickly from plane Stress state turns to three-dimensional space stress state, plays the role of reinforcing country rock and inhibits rock burst;Advanced early strong anchor pole is timely Anchorage effect is played, anchor lives early stage rock burst chip off-falling, landslide, and over time, anchoring ability enhancing, reaching prevents rock burst from collapsing Required anchor force.
It should be noted that in a particular application, multiple rows of interlaced arrangement up and down can also be arranged on tunnel tunnel face Advanced glass fibre anchor pole row group 8.When rock burst occurs for face, the advanced glass fibre anchor pole thrown into driving front can be right Face is reinforced, and especially when the anchorage length of advanced glass fibre anchor pole is 2 times of explosion advanced depths, is followed at one Still some anchor pole stays in rock mass and plays reinforcement effect to face after ring explosion.
Referring to fig. 2, strong rock burst section tunnel support structure work progress is as follows:
The advanced stress release measure of step 1, strong rock burst section: to face along arch wall outline excavation perimeter line before excavating Apply the advanced stress hole Φ 76 of long 25m, circumferential spacing 50cm carries out weak blast to country rock presplitting in hole, discharges stress in advance; Watering softening is carried out to face peripheral rock after excavation, discharges stress;
The advance support measure of step 2, strong rock burst section: arch construction advance anchor bolt, advance anchor bolt annular spacing are 50cm, face apply the advanced glass fibre anchor pole of Φ 25;
The strengthening supporting measure of step 3, strong rock burst section: arch wall just sprays 5cm thickness CF25 steel fiber reinforced concrete, and arch wall is hung4.0m long YE25-5 expansion shell type prestressing force hollow bolt, anchor pole 1.0 × 1.0m of spacing, staggeredly cloth is arranged in steel mesh, arch wall It sets, sets up arch wall shaped steel arch, longitudinal pitch 1m;C25 concrete is sprayed again to design thickness.
Above embodiments are exemplary description of this patent, do not limit its protection scope, those skilled in the art Member can also be changed its part, as long as it does not exceed the essence of this patent, within the protection scope of the present patent.

Claims (8)

1. a kind of strong rock burst section tunnel support structure, it is characterised in that: the first spray steel including being set in turn in tunnel wall surface is fine Expansion shell type prestressing force in dimension concrete layer, steel mesh, profile steel frame and multiple pneumatically placed concrete layer, and insertion tunnel surrounding is hollow Anchor pole, tunnel tunnel face have multiple advanced stress holes for protruding into country rock along arch wall outline excavation perimeter line is circumferentially disposed.
2. strong rock burst section tunnel support structure according to claim 1, it is characterised in that: tunnel tunnel face is opened along arch Outline perimeter wire loop is dug to being disposed with multiple advance anchor bolts for protruding into country rock.
3. strong rock burst section tunnel support structure according to claim 1 or 2, it is characterised in that: set on tunnel tunnel face There is advanced glass fibre anchor pole row's group of multiple rows of interlaced arrangement up and down, the anchorage length of each advanced glass fibre anchor pole is 2 times quick-fried Broken advanced depth.
4. strong rock burst section tunnel support structure according to claim 2, it is characterised in that: the annular of the advance anchor bolt Spacing is 50cm.
5. strong rock burst section tunnel support structure according to claim 1 or 2, it is characterised in that: the advanced stress hole Annular spacing be 50cm.
6. strong rock burst section tunnel support structure according to claim 1 or 2, it is characterised in that: described just to spray steel fibre The CF25 steel fiber concrete layer that concrete layer uses with a thickness of 5cm.
7. strong rock burst section tunnel support structure according to claim 1 or 2, it is characterised in that: the expansion shell type is answered in advance Power hollow bolt submits wrong arrangement in tunnel wall surface.
8. strong rock burst section tunnel support structure according to claim 1 or 2, it is characterised in that: the profile steel frame Longitudinal pitch is 1m, and the multiple pneumatically placed concrete layer uses C25 concrete layer.
CN201821822000.XU 2018-11-06 2018-11-06 A kind of strong rock burst section tunnel support structure Active CN209115122U (en)

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CN201821822000.XU CN209115122U (en) 2018-11-06 2018-11-06 A kind of strong rock burst section tunnel support structure

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110219679A (en) * 2019-07-22 2019-09-10 西南交通大学 A kind of soft stratum tunnel lining structure
CN115420161A (en) * 2022-08-29 2022-12-02 四川公路桥梁建设集团有限公司 Underground chamber rock burst prevention and treatment method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110219679A (en) * 2019-07-22 2019-09-10 西南交通大学 A kind of soft stratum tunnel lining structure
CN115420161A (en) * 2022-08-29 2022-12-02 四川公路桥梁建设集团有限公司 Underground chamber rock burst prevention and treatment method

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