CN106351669A - Construction method for inhibiting loess mudstone tunnel bottom plate uplifting and longitudinal cracking - Google Patents
Construction method for inhibiting loess mudstone tunnel bottom plate uplifting and longitudinal cracking Download PDFInfo
- Publication number
- CN106351669A CN106351669A CN201610905608.8A CN201610905608A CN106351669A CN 106351669 A CN106351669 A CN 106351669A CN 201610905608 A CN201610905608 A CN 201610905608A CN 106351669 A CN106351669 A CN 106351669A
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- China
- Prior art keywords
- tunnel
- inverted arch
- construction method
- loess
- tunnel bottom
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- Pending
Links
- 238000010276 construction Methods 0.000 title claims abstract description 22
- 238000005336 cracking Methods 0.000 title claims abstract description 13
- 230000002401 inhibitory effect Effects 0.000 title abstract 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 239000004575 stone Substances 0.000 claims description 17
- 230000001629 suppression Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 6
- 238000009412 basement excavation Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 description 6
- 239000010410 layer Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 206010015866 Extravasation Diseases 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000036251 extravasation Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
-
- 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
- E21D11/04—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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a construction method for inhibiting loess mudstone tunnel bottom plate uplifting and longitudinal cracking. During the digging construction on loess mudstone tunnels with a horseshoe-shaped cross section form and has weak expansibility on surrounding rock, positions above an arching foot are constructed according to design parameters; the width of a tunnel cross section keeps unchanged; the digging depth of the tunnel bottom is increased; meanwhile, the support depth is increased; an anti-cracking steel frame net piece is laid on the top surface of an inverted arch filling layer. The method provided by the invention has the advantages that by using a construction method of deepening the tunnel bottom and installing the anti-crack steel bar net piece on the top surface, the cross section of the whole tunnel support structure is similar to a round shape; the bottom stress arch of an inverted arch can bear greater load and expansion force, so that the surrounding rock pressure born by the surface of the support structure can be more balanced; steel bars in the filling layer can effectively achieve the anti-crack effect; the generation of longitudinal cracks of a tunnel bottom plate can be inhibited; the structure stability and the integrality are ensured; the tunnel durability is improved.
Description
Technical field
The present invention relates to technical field of tunnel construction is and in particular to a kind of suppression loess mud stone tunnel floor swells and longitudinal
The construction method of cracking.
Background technology
The fast development built with high ferro, need to build tunnel in mountain area and hilly country, in the process of constructing tunnel
In, when facing muddy loess rock tunnel, mud stone has certain expansion characteristics, and construction stage mud stone is relatively stable, but
After inverted arch closing a period of time, destructiveness gradually appears, and tunnel bed mud rock gradually expands, and when expansive force reaches to a certain degree, passes
System horse-shoe tunnel base plate will appear from swelling, plain concrete packed layer top surface longitudinal cracking defect phenomenon, above-mentioned tunnel bottom
The scope of the protuberance of plate usually has certain critical field, after exceeding the critical field of protuberance, can make later stage Wu Zha road
Bed produces displacement, and rail flexibility index reduces, and seriously jeopardizes operation security.
Content of the invention
It is an object of the invention to provide the construction method of a kind of suppression loess mud stone tunnel floor protuberance and longitudinal cracking,
Effectively suppression tunnel floor protuberance is it is ensured that the operation security in tunnel later stage.
For achieving the above object, the technical solution used in the present invention is:
A kind of suppression loess mud stone tunnel floor protuberance and the construction method of longitudinal cracking,
A), the lithology of detection tunnel bed mud rock and material resources mechanical index；
When b), excavating mudstone stratum tunnel bottom, more than skewback excavate radius and constructed by design parameter, tunnel bottom cutting depth
Determined by three-dimensional artificial numerical simulation calculation；
C), keep the width of tunnel cross-section constant, increase the depth at tunnel bottom；
D), set profile steel frame in tunnel underframe；
E), in packed layer top surface, anticracking reinforced mesh is installed.
The attachment feature of present method invention also presence is: sets up three-dimensional artificial mould according to the lithology mechanical index of detection
Type, calculates approximate formula y=9-1.7x that suppression loess mudstone tunnel tunnel bottom protuberance is deepened with inverted arch,
Y is tunnel bottom protuberance value (cm)
X deepens depth (m) for inverted arch.
After tunnel excavation, profile steel frame and the supporting of tunnel bottom are equally deepened.
The double-deck anticracking reinforced mesh of inverted arch filling top surface laying in tunnel, fill concrete one-time-concreting completes.With now
Technology is had to compare, the technique effect that the present invention possesses is: mainly by deepening to the tunnel bottom in tunnel, top surface is arranged the present invention
The construction method of top surface reinforcing bar, makes whole tunnel support structure section level off to circle, and stress arch in inverted arch bottom can carry bigger
Load and expansive force, so that the pressure from surrounding rock that supporting construction surface is born more is equalized, and fill in reinforcing bar can effectively send out
Wave anti-crack function, the generation of suppression tunnel floor longitudinal crack, it is ensured that the stable and globality of structure, improves later stage tunnel
The safety running.
Brief description
Fig. 1 is the end view after the tunnel bottom intensification in tunnel；
Fig. 2 is the sectional drawing of the erection profile steel frame after the tunnel bottom intensification in tunnel；
Fig. 3 fills top surface steel bar arrangement figure for after the tunnel bottom intensification in tunnel.
Specific embodiment
In conjunction with Fig. 1 to Fig. 3, the present invention is further described:
A kind of suppression loess mud stone tunnel floor protuberance and the construction method of longitudinal cracking,
A), the tunnel bottom 11 mud stone lithology in detection tunnel 10 and material resources mechanical index.
B), tunnel is carried out with excavation construction, excavates radius and inverted arch outward flange radius is constructed according to design load, tunnel
10 tunnel bottom 11 is mud stone；
C), keep the width of tunnel 10 section constant, increase the depth at the tunnel bottom 11 in tunnel 10；
D), set up profile steel frame 30 at the tunnel bottom 11 in tunnel 10；
E), the top surface in tunnel inverted arch 10 installs anticracking reinforced mesh 20.
The present invention, mainly by deepening to the tunnel bottom 11 in tunnel 10, fills top surface in inverted arch and arranges anticracking reinforcing bar 20
Construction method, makes whole tunnel 10 supporting construction section level off to circle, and stress arch in inverted arch bottom 11 can carry bigger load
And expansive force, so that the pressure from surrounding rock that supporting construction surface is born more is equalized, and fill in reinforcing bar 20 can effectively play anti-
Split effect, the generation of suppression tunnel 10 base plate longitudinal crack, it is ensured that the stable and globality of structure, improves later stage tunnel 10
The safety running.
In described step a, three-dimensional simulation model is set up according to the lithology mechanical index of detection, calculate suppression loess mud stone
Approximate formula y=9-1.7x that tunnel tunnel bottom protuberance is deepened with inverted arch,
Y is tunnel bottom 11 protuberance value (cm)
X deepens depth (m) for inverted arch.
After tunnel excavation, profile steel frame 30 and the supporting of tunnel bottom are equally deepened.
The double-deck anticracking reinforced mesh of inverted arch filling top surface laying in tunnel 10, fill concrete one-time-concreting completes.
Above-mentioned holding former tunnel 10 section width is constant, changes its curvature so as to depth increases by adjusting inverted arch radius.
Deepened on the basis of original design in tunnel 10 midline inverted arch filling thickness by calculating.
The pore water of front ejectment country rock extravasation is excavated at tunnel bottom 10, forbids current to soak tunnel bottom.
Just lined steel frame radius accordingly adjusts inverted arch, arch wall and the smoother connection of inverted arch, just lining, inverted arch thickness, steelframe, reinforcing bar type
Number still press original design parameter constant.
Longitudinally bury drainage culvert according to design altitude position in inverted arch filling, drainage culvert lower concrete vibrates close
Real.
Lay double layer bar, top layer reinforcing bar net protective layer thickness 50mm in filling top surface 0.35m, transverse steel adopts
Diameter 18mm spiral, longitudinal pitch 0.4m, it is connected with lining cutting cage bar inside inverted arch；Longitudinal reinforcement adopts diameter 12mm screw thread
Steel, horizontal spacing 0.4m；Vertical stirrup adopts diameter phi 8mm round steel, horizontal, longitudinal pitch 0.4cm, fill concrete one-time-concreting
Complete.
Inverted arch fill concrete reach design strength 100% after plant equipment can directly pass through.
Claims (4)
1. a kind of suppression loess mud stone tunnel floor protuberance and longitudinal cracking construction method it is characterised in that:
A), tunnel bottom (11) the mud stone lithology of detection tunnel (10) and material resources mechanical index.
B), tunnel is carried out with excavation construction, excavates radius and inverted arch outward flange radius is constructed according to design load, tunnel (10)
Tunnel bottom (11) be mud stone；
C), keep the width of tunnel (10) section constant, increase the depth at the tunnel bottom (11) in tunnel (10)；
D), set up profile steel frame (30) at the tunnel bottom (11) of tunnel (10)；
E), the top surface in tunnel inverted arch (10) installs anticracking reinforced mesh (20).
2. the construction method of suppression loess mud stone tunnel floor protuberance according to claim 1 and longitudinal cracking, its feature
It is: in described step a, three-dimensional simulation model is set up according to the lithology mechanical index of detection, calculate suppression loess mud stone tunnel
Approximate formula y=9-1.7x that road tunnel bottom protuberance is deepened with inverted arch,
Y is tunnel bottom (11) protuberance value (cm)
X deepens depth (m) for inverted arch.
3. the construction method of suppression loess mud stone tunnel floor protuberance according to claim 2 and longitudinal cracking, its feature
It is: after tunnel excavation, profile steel frame (30) and the supporting of tunnel bottom are equally deepened.
4. the construction method of suppression loess mud stone tunnel floor protuberance according to claim 1 and longitudinal cracking, its feature
It is: in the double-deck anticracking reinforced mesh of inverted arch filling top surface laying of tunnel (10), fill concrete one-time-concreting completes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610905608.8A CN106351669A (en) | 2016-10-17 | 2016-10-17 | Construction method for inhibiting loess mudstone tunnel bottom plate uplifting and longitudinal cracking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610905608.8A CN106351669A (en) | 2016-10-17 | 2016-10-17 | Construction method for inhibiting loess mudstone tunnel bottom plate uplifting and longitudinal cracking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106351669A true CN106351669A (en) | 2017-01-25 |
Family
ID=57866912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610905608.8A Pending CN106351669A (en) | 2016-10-17 | 2016-10-17 | Construction method for inhibiting loess mudstone tunnel bottom plate uplifting and longitudinal cracking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106351669A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107401413A (en) * | 2017-08-29 | 2017-11-28 | 中铁第勘察设计院集团有限公司 | Tunnel structure for expansive stratum |
| CN107476812A (en) * | 2017-09-27 | 2017-12-15 | 贵州省公路工程集团有限公司 | A kind of assembled inverted arch and preparation method thereof |
| CN107524458A (en) * | 2017-08-30 | 2017-12-29 | 中铁二院工程集团有限责任公司 | A kind of tunnel lining structure with tunnel bottom deformation allowance |
| CN109057826A (en) * | 2018-08-08 | 2018-12-21 | 中铁二院工程集团有限责任公司 | A kind of truss-like tunnel inverted arch liner structure |
-
2016
- 2016-10-17 CN CN201610905608.8A patent/CN106351669A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107401413A (en) * | 2017-08-29 | 2017-11-28 | 中铁第勘察设计院集团有限公司 | Tunnel structure for expansive stratum |
| CN107524458A (en) * | 2017-08-30 | 2017-12-29 | 中铁二院工程集团有限责任公司 | A kind of tunnel lining structure with tunnel bottom deformation allowance |
| CN107524458B (en) * | 2017-08-30 | 2023-09-22 | 中铁二院工程集团有限责任公司 | Tunnel lining structure with tunnel bottom reserved deformation |
| CN107476812A (en) * | 2017-09-27 | 2017-12-15 | 贵州省公路工程集团有限公司 | A kind of assembled inverted arch and preparation method thereof |
| CN109057826A (en) * | 2018-08-08 | 2018-12-21 | 中铁二院工程集团有限责任公司 | A kind of truss-like tunnel inverted arch liner structure |
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Application publication date: 20170125 |