CN109488339A - Yield of deep-buried cavities excavation supporting method in supporting construction and prismatical joint basalt - Google Patents
Yield of deep-buried cavities excavation supporting method in supporting construction and prismatical joint basalt Download PDFInfo
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- CN109488339A CN109488339A CN201811549975.4A CN201811549975A CN109488339A CN 109488339 A CN109488339 A CN 109488339A CN 201811549975 A CN201811549975 A CN 201811549975A CN 109488339 A CN109488339 A CN 109488339A
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- excavation
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 41
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 239000004567 concrete Substances 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 239000007921 spray Substances 0.000 claims abstract description 13
- 238000013461 design Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 22
- 239000011435 rock Substances 0.000 claims description 18
- 238000004880 explosion Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 8
- 239000011210 fiber-reinforced concrete Substances 0.000 claims description 6
- 239000011241 protective layer Substances 0.000 claims description 6
- 239000002105 nanoparticle Substances 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000035772 mutation Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 210000003205 muscle Anatomy 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 238000005065 mining Methods 0.000 abstract description 2
- 238000011160 research Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 2
- 235000011613 Pinus brutia Nutrition 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention relates to yield of deep-buried cavities excavation supporting methods in a kind of supporting construction and prismatical joint basalt.The object of the present invention is to provide yield of deep-buried cavities excavation supporting methods in a kind of simple and easy supporting construction and prismatical joint basalt to reduce project cost to shorten the construction period.The technical scheme is that a kind of supporting construction, it sprays it is characterized by: having in the nanometer steel fiber concrete layer in excavation face, nanometer steel fiber concrete layer surface covers steel mesh, and steel mesh is fixed on excavation face through prestressed anchor, and reinforcing bar net surface has sprayed plain concrete layer.The present invention be suitable for building, water power, mining, can store up, the industries such as scientific research the prismatical joint cavern basalt Nei great abutment wall excavation supporting design.
Description
Technical field
The present invention relates to yield of deep-buried cavities excavation supporting methods in a kind of supporting construction and prismatical joint basalt.It is applicable in
In building, water power, mining, can store up, the industries such as scientific research are designed in the excavation supporting of the prismatical joint cavern basalt Nei great abutment wall.
Background technique
With China's basis instrument construction Persisting exploitation, large quantities of huge, underground engineerings are emerged, such as huge water power
Engineering, deep tunnel traffic engineering etc..Excavation size, design buried depth, the hole group's scale of underground chamber are increasing, cavern's preservation
Geological conditions also becomes increasingly complex.
The development of Southwestern China portion area high mountain gorge, complex geologic conditions multiplicity, especially in the basalt of prismatical joint
Excavate large underground hole, generally face high-ground stress, self are poor, prismatical joint is loose, discontinuities array collapsing
The problems such as.Under this condition, using conventional excavation supporting construction technology, underground chamber abutment wall relaxation depth is often deep, has
Be more than 6 meters, also be even up to 9 meters, have exceeded conventional suspension roof support length, it is forced to implement anchor cable, this
Not only the duration is extended, but also increases project cost.
Summary of the invention
The technical problem to be solved by the present invention is in view of the above problems, providing a kind of simple and easy supporting knot
Yield of deep-buried cavities excavation supporting method in structure and prismatical joint basalt reduces project cost to shorten the construction period.
The technical scheme adopted by the invention is that: a kind of supporting construction, it is characterised in that: have and spray in excavation face
Nanometer steel fiber concrete layer, nanometer steel fiber concrete layer surface cover steel mesh, and steel mesh is fixed on through prestressed anchor
Excavation face, reinforcing bar net surface have sprayed plain concrete layer.
Nano particle and volume content of steel fibers are more than or equal to 45kg/m in the nanometer steel fiber concrete layer3。
The thickness of the nanometer steel fiber concrete layer is more than or equal to 10cm.
One end of the prestressed anchor is fixed in country rock, described in the other end of the prestressed anchor is compressed through anchor plate
Steel mesh.
Yield of deep-buried cavities excavation supporting method in a kind of prismatical joint basalt, which is characterized in that steps are as follows:
Using stage excavation, same layer subregion, successively middle part pumping slot mode is excavated, and every layer of excavation height controls within 5m,
Underground chamber designs and reserves protective layer at sideline, 2~3m of protective layer thickness, and underground chamber designs sideline and uses photoface exploision；
After the completion of excavation, closed immediately using spray nanometer steel fiber reinforced concrete in excavation face, spray concrete thickness is greater than etc.
It is more than or equal to 45kg/m in 10cm, nano particle and steel fibre quality3；
Steel mesh is hung on nanometer steel fiber reinforced concrete surface, steel mesh is fixed on country rock, steel mesh through prestressed anchor
Plain concrete is sprayed again in surface.
In work progress, keep carrying out explosion, displacement, stress, strain, crack folding, underground water etc. to country rock and supporting
Data are monitored, and are timely feedbacked；
Collected monitoring data are assessed and analyzed, verified and correct existing design scheme, can be directed to when necessary
It monitors mutation point and carries out strengthening supporting, it is ensured that adjoining rock stability.
Supporting construction should be completed in 3 days after the completion of excavation, and lag face < 30m.
The beneficial effects of the present invention are: the present invention is in the case where prismatical joint basalt is developed, huge underground cavity is using thin
Layer excavation, photoface exploision substantially reduce the relaxation of country rock caused by explosion, by sealing to the timely stir cement and soft soil in deep ground of excavation face
It closes and applies prestressed anchor and control further pine of the cavern prismatical joint basalt rock mass when excavation unloads loose lotus
It relaxes, finally hangs integrality and globality that the spray plain concrete of steel mesh+again ensures support system.The present invention substantially reduces side
The relaxation degree of wall, it is ensured that abutment wall adjoining rock stability saves construction investment, accelerates construction speed.
Detailed description of the invention
Fig. 1 is excavation construction schematic diagram in embodiment.
Fig. 2 is the A-A cross-sectional view of Fig. 1.
Fig. 3 is support construction schematic diagram in embodiment.
Fig. 4 is the structural schematic diagram of supporting construction in embodiment.
Fig. 5 is the connection schematic diagram of steel mesh and prestressed anchor in embodiment.
Specific embodiment
The present embodiment is yield of deep-buried cavities excavation supporting method in a kind of prismatical joint basalt, the specific steps are as follows:
1, blasting technology:
As shown in Figure 1 and Figure 2, it is influenced to reduce explosion to high side wall, in such a way that stage excavation, same layer subregion excavate
It excavates, underground chamber abutment wall (design sideline) reserved protective layer 1,1 2~3m of thickness of protective layer, every layer of excavation height control is in 5m
Within.To control Forming Quality, abutment wall (design sideline) uses photoface exploision, strict control blasting scale, explosive quantity in a sound, explosion
Parameter can be determined by engineer testing.Successively middle part pumping slot excavates in the present embodiment, first abutment wall outside (namely in same layer
Portion) excavate to fall to form free face, then when explosion can light it is quick-fried, abutment wall excavation effect is more preferable.The present embodiment reasonably divides
Layer subregion is both conducive to limit explosion, is also conducive to work continuously, shorten the construction period.
2, zero propagation preliminary bracing:
Prismatical joint hole section self-stable ability is poor, and usually shorter from the steady time, the more timely supporting stronger, the better.It excavates and completes
Afterwards, it is closed immediately using spray nanometer steel fiber reinforced concrete, spray concrete thickness is not less than 10cm, nano particle and steel fibre quality
Recommend to be not less than 45kg/m3(being determined in combination with scene wall rock condition and engineer testing).Pneumatically placed concrete can be implemented rapidly, and closing is enclosed
Rock ensures supporting timeliness；Shotcrete strength can be improved in reasonable mixing of steel fiber, increases supporting intensity.
3, in due course preliminary bracing:
For the relationship for balancing rapid construction and adjoining rock stability, after preferential completion zero propagation preliminary bracing, Ying Zeji is complete as early as possible
At remaining preliminary bracing, it is included in a nanometer steel fiber reinforced concrete surface and hangs steel mesh, steel mesh is fixed on through prestressed anchor
Country rock, reinforcing bar net surface spray plain concrete again (see Fig. 3).Remaining preliminary bracing should be completed in 3 days after the completion of excavation, and supporting is stagnant
Face length answers < 30m afterwards.
After preliminary bracing structure is fully completed, has and spray in the nanometer steel fiber concrete layer 2 in excavation face, nanometer steel
2 surface of fiber concrete layer covers steel mesh 3, and steel mesh 3 is fixed on excavation face through prestressed anchor 4, and 3 surface of steel mesh sprays
There is plain concrete layer 5 (see Fig. 4), form complete initial stage flexible support system, can effectively limit prismatical joint basalt pine
Relax deformation.One end of prestressed anchor 4 is fixed in country rock in this example, and the other end of the prestressed anchor is pressed through anchor plate 401
Tight steel mesh (see Fig. 5).
The present embodiment in the construction process, keeps opening country rock and supporting progress explosion, displacement, stress, strain, crack
The data such as conjunction, underground water are monitored, and are timely feedbacked, and are specifically included: periodical visual inspection observation；The suitable typical monitoring of selection is disconnected
Corresponding monitoring instrument, including blasting vibration detector, Convergence monitoring, bolt stress meters, Multiple contact deformeter are simultaneously arranged etc. in face.To adopting
The monitoring data collected are assessed and are analyzed, and are verified and are corrected existing design scheme, can be clicked through when necessary for monitoring mutation
Row strengthening supporting, it is ensured that adjoining rock stability.
Claims (7)
1. a kind of supporting construction, it is characterised in that: have and spray in the nanometer steel fiber concrete layer (2) in excavation face, nanometer
Steel fiber concrete layer (2) surface covers steel mesh (3), and steel mesh (3) is fixed on excavation face, reinforcing bar through prestressed anchor (4)
Net (3) surface has sprayed plain concrete layer (5).
2. supporting construction according to claim 1, it is characterised in that: nanometer in the nanometer steel fiber concrete layer (2)
Particle and volume content of steel fibers are more than or equal to 45kg/m3。
3. supporting construction according to claim 1 or 2, it is characterised in that: the thickness of the nanometer steel fiber concrete layer (2)
Degree is more than or equal to 10cm.
4. supporting construction according to claim 1, it is characterised in that: one end of the prestressed anchor (4), which is fixed on, encloses
In rock, the other end of the prestressed anchor (4) compresses the steel mesh (3) through anchor plate (401).
5. yield of deep-buried cavities excavation supporting method in a kind of prismatical joint basalt, which is characterized in that steps are as follows:
Using stage excavation, same layer subregion, successively middle part pumping slot mode is excavated, and every layer of excavation height control is within 5m, underground
Cavern designs and reserves protective layer (1) at sideline, and protective layer (1) 2~3m of thickness, underground chamber designs sideline and uses photoface exploision；
After the completion of excavation, closed immediately using spray nanometer steel fiber reinforced concrete in excavation face, spray concrete thickness is more than or equal to
10cm, nano particle and steel fibre quality are more than or equal to 45kg/m3；
It is hung steel mesh (3) on nanometer steel fiber reinforced concrete surface, steel mesh (3) is fixed on country rock, steel through prestressed anchor (4)
Plain concrete is sprayed again in muscle net (3) surface.
6. yield of deep-buried cavities excavation supporting method in prismatical joint basalt according to claim 5, it is characterised in that:
In work progress, keep carrying out the data such as explosion, displacement, stress, strain, crack folding, underground water to country rock and supporting
It is monitored, and timely feedbacks；
Collected monitoring data are assessed and analyzed, verified and correct existing design scheme, it when necessary can be for monitoring
Mutation point carries out strengthening supporting, it is ensured that adjoining rock stability.
7. yield of deep-buried cavities excavation supporting method in prismatical joint basalt according to claim 5, it is characterised in that:
Supporting construction should be completed in 3 days after the completion of excavation, and lag face < 30m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811549975.4A CN109488339A (en) | 2018-12-18 | 2018-12-18 | Yield of deep-buried cavities excavation supporting method in supporting construction and prismatical joint basalt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811549975.4A CN109488339A (en) | 2018-12-18 | 2018-12-18 | Yield of deep-buried cavities excavation supporting method in supporting construction and prismatical joint basalt |
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| Publication Number | Publication Date |
|---|---|
| CN109488339A true CN109488339A (en) | 2019-03-19 |
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| CN201811549975.4A Pending CN109488339A (en) | 2018-12-18 | 2018-12-18 | Yield of deep-buried cavities excavation supporting method in supporting construction and prismatical joint basalt |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112483121A (en) * | 2020-11-11 | 2021-03-12 | 中国电建集团华东勘测设计研究院有限公司 | Anti-loosening support method for columnar joint surrounding rock of underground cavern |
| CN114087020A (en) * | 2021-10-09 | 2022-02-25 | 中国电建集团华东勘测设计研究院有限公司 | Underground cavern stability evaluation method based on dual safety of rock mass and supporting structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101440708A (en) * | 2008-12-19 | 2009-05-27 | 中建国际建设有限公司 | PBA shallow buried underground excavating close range large section three-hole separated island type structure construction method |
| CN108518232A (en) * | 2018-04-11 | 2018-09-11 | 中铁十七局集团有限公司 | The anti-rock burst method for protecting support of single-track railway tunnel of corresponding different rock burst intensity grades |
| CN209483378U (en) * | 2018-12-18 | 2019-10-11 | 中国电建集团华东勘测设计研究院有限公司 | Supporting construction |
-
2018
- 2018-12-18 CN CN201811549975.4A patent/CN109488339A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101440708A (en) * | 2008-12-19 | 2009-05-27 | 中建国际建设有限公司 | PBA shallow buried underground excavating close range large section three-hole separated island type structure construction method |
| CN108518232A (en) * | 2018-04-11 | 2018-09-11 | 中铁十七局集团有限公司 | The anti-rock burst method for protecting support of single-track railway tunnel of corresponding different rock burst intensity grades |
| CN209483378U (en) * | 2018-12-18 | 2019-10-11 | 中国电建集团华东勘测设计研究院有限公司 | Supporting construction |
Non-Patent Citations (1)
| Title |
|---|
| 倪绍虎等: "柱状节理玄武岩的破坏模式、破坏机制及工程对策", 岩石力学与工程学报, vol. 35, pages 3064 - 3075 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112483121A (en) * | 2020-11-11 | 2021-03-12 | 中国电建集团华东勘测设计研究院有限公司 | Anti-loosening support method for columnar joint surrounding rock of underground cavern |
| CN112483121B (en) * | 2020-11-11 | 2023-06-06 | 中国电建集团华东勘测设计研究院有限公司 | Anti-loosening supporting method for columnar joint surrounding rock of underground cavern |
| CN114087020A (en) * | 2021-10-09 | 2022-02-25 | 中国电建集团华东勘测设计研究院有限公司 | Underground cavern stability evaluation method based on dual safety of rock mass and supporting structure |
| CN114087020B (en) * | 2021-10-09 | 2024-04-02 | 中国电建集团华东勘测设计研究院有限公司 | Underground cavern stability evaluation method based on rock mass and supporting structure dual safety |
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Application publication date: 20190319 |