CN209115122U - A kind of strong rock burst section tunnel support structure - Google Patents
A kind of strong rock burst section tunnel support structure Download PDFInfo
- 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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- tunnel
- rock burst
- support structure
- burst section
- concrete layer
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- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or 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
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821822000.XU CN209115122U (en) | 2018-11-06 | 2018-11-06 | A kind of strong rock burst section tunnel support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821822000.XU CN209115122U (en) | 2018-11-06 | 2018-11-06 | A kind of strong rock burst section tunnel support structure |
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| Publication Number | Publication Date |
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| CN209115122U true CN209115122U (en) | 2019-07-16 |
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| CN201821822000.XU Active 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)
| 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 |
-
2018
- 2018-11-06 CN CN201821822000.XU patent/CN209115122U/en active Active
Cited By (2)
| 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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