CN110378067A - Tunnel three-dimensional is longitudinally continuous the determination method of landslide safety and supporting parameter - Google Patents
Tunnel three-dimensional is longitudinally continuous the determination method of landslide safety and supporting parameter Download PDFInfo
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Abstract
The invention discloses a kind of determination method that tunnel three-dimensional is longitudinally continuous landslide safety and supporting parameter, include the following steps: that continuous landslide section landslide body is divided into three parts by (1): being located in the middle a prism, and positioned at both ends is two hemivertebras；And calculate the height and volume of landslide body；(2) the external force power and the internal energy dissipated power of landslide that landslide body gravity load is done are calculated；(3) landslide safety coefficient is calculated；And judge whether to need supporting, if desired supporting, calculate the minimal support power that support reinforcement provides；The thickness of gunite concrete when determining supporting.In present invention situation known to Analysis of Field Geotechnical Parameters and tunnel size, it can judge whether tunnel can occur continuously to cave in；The present invention can also cave in safety coefficient, when safety coefficient Pollen sterility needs supporting, additionally it is possible to determine the thickness of corresponding landslide body volume, minimal support power and corresponding supporting concrete.
Description
Technical field
The present invention relates to technical field of tunnel construction, and in particular to a kind of tunnel three-dimensional is longitudinally continuous landslide safety and branch
Protect determination method for parameter.
Background technique
Often there is the continuous cave in accident in big section of tunnel, such as Lan-xing Railway the second double line in bad ground in tunneling
Continuous landslide occurs for the tunnel little Ping Qiang Kou, brings biggish difficulty to rescue work.Be not only traffic tunnel (vcehicular tunnel,
Railway tunnel, subway sectional tunnel) construction in, underground pipe gallery, hydraulic tunnel, powerhouse of hydropower station underground chamber, mining
In roadway construction, the accident continuously caved in can be also encountered.It is individual that engineering is directed to mostly for the research about Tunnel Landslide at present
Case carries out numerical simulation analysis or empirically determined, and subjective factor influence is very big, very to the Research Literature continuously to cave in
It is few, and how to determine that continuous landslide shape and landslide body volume size are rarely reported.
Summary of the invention
In order to solve the above technical problem, the present invention provides one kind can judge the tunnel whether tunnel can occur continuously to cave in
Road three-dimensional is longitudinally continuous the determination method of landslide safety and supporting parameter；It may further determine that corresponding landslide body volume, minimum
The thickness of supporting power and gunite concrete.
The technical solution adopted by the present invention is that: a kind of tunnel three-dimensional is longitudinally continuous the determination of landslide safety and supporting parameter
Method includes the following steps: that continuous landslide section landslide body is divided into three parts by (1): being located in the middle a prism, and be located at
Both ends are two hemivertebras；And calculate the height and volume of landslide body；
(2) the external force power and the internal energy dissipated power of landslide that landslide body gravity load is done are calculated；
(3) landslide safety coefficient is calculated；And judge whether to need supporting, if desired supporting, calculate what support reinforcement provided
Minimal support power；The thickness of gunite concrete when determining supporting.
Above-mentioned tunnel three-dimensional is longitudinally continuous in the determination method of landslide safety and supporting parameter, in step (1), landslide
The height and volume of body are calculated as follows:
In formula: h is landslide body height；D is that Rectangular Tunnel excavates span；φ is country rock internal friction angle；L is among landslide body
Cylinder length；π is pi, VBodyFor the volume for the body that caves in.
Above-mentioned tunnel three-dimensional is longitudinally continuous in the determination method of landslide safety and supporting parameter, in step (2), according to
Following formula calculates the external force power that landslide body gravity load is done:
In formula: WrThe external force power done for landslide body gravity load；γ is country rock severe；V is the interruption on the plane of fracture
Speed.
Above-mentioned tunnel three-dimensional is longitudinally continuous in the determination method of landslide safety and supporting parameter, in step (2), according to
Following formula calculates landslide energy dissipated power in vivo are as follows:
In formula: EDFor interior energy dissipated power；C is cohesion.
Above-mentioned tunnel three-dimensional is longitudinally continuous in the determination method of landslide safety and supporting parameter, in step (3), landslide
Safety coefficient are as follows:
If K, less than 1, tunnel needs supporting, the minimal support power that support reinforcement provides is determined by following formula:
In formula: p is the minimal support power that support reinforcement parameter provides.
Above-mentioned tunnel three-dimensional is longitudinally continuous in the determination method of landslide safety and supporting parameter, in step (3), supporting
The thickness of gunite concrete when reinforcing, is determined by the following:
In formula: dsFor the thickness of gunite concrete；σcFor the compression strength of gunite concrete, according to the strong of gunite concrete
Grade is spent to obtain.
After the strength grade for determining injection gunite concrete, σ can be obtainedc；It may thereby determine that the minimum spray of spray-up
Penetrate thickness.
In the situation known to Analysis of Field Geotechnical Parameters and tunnel size, it can be determined that whether tunnel, which can occur, continuously caves in；And
To corresponding safety coefficient, if unstable, according to this method, corresponding landslide body volume may further determine that；If supporting is taken to add
Gu measure may further determine that minimal support power and corresponding supporting parameter.
Compared with prior art, the beneficial effects of the present invention are: present invention feelings known to Analysis of Field Geotechnical Parameters and tunnel size
Under condition, it can judge whether tunnel can occur continuously to cave in；The present invention can also cave in safety coefficient, when safety coefficient Pollen sterility
When needing supporting, additionally it is possible to determine the thickness of corresponding landslide body volume, minimal support power and corresponding supporting concrete.This hair
The bright safety that can also continuously cave in applied to underground chambers such as mining tunnel, diversion tunnel, underground pipe gallery, water generatings
Judgement and supporting parameter determination.
Detailed description of the invention
Fig. 1 is the perspective view in tunnel of the present invention and the body that caves in.
Fig. 2 is the landslide body composite structural diagram in tunnel of the present invention.
Fig. 3 is the safety coefficient of the embodiment of the present invention with L/D variation diagram.
Fig. 4 is the minimal support power of the embodiment of the present invention with L/D variation diagram (negative number representation safety, do not need supporting).
Fig. 5 is that (negative number representation does not need to prop up with L/D variation diagram for the gunite concrete minimal support thickness of the embodiment of the present invention
Shield).
In figure: h is landslide height；D is that Rectangular Tunnel excavates span, then can be using area etc. for horse-shoe tunnel
The mode of effect is handled；L is landslide body intermediate cylinder length；V is the discontinuous velocity on the plane of fracture.
Specific embodiment
The method of the present invention is further described with reference to the accompanying drawing.
The present invention includes the following steps:
(1) country rock correlation mechanics parameter is obtained, as among the above according to Tunnel Engineering overview and country rock level condition first
Tunnel span D, country rock cohesion c, country rock internalfrictionangleφ, severe γ of country rock etc., tunnel continuously cave in segment length L among body
Deng as shown in Figure 1.
And continuous landslide section landslide body is divided into three parts: being located in the middle a prism 2 and positioned at half vertebra at both ends
Body 1 and hemivertebra 3.
The height and volume of landslide body are calculated according to the following formula:
In formula: h is landslide body height；D is that Rectangular Tunnel excavation span can then use area for horse-shoe tunnel
Equivalent mode is handled；φ is country rock internal friction angle；L is the length of prism 2 among landslide body；π is pi；VBodyFor landslide
The volume of body, as shown in Figure 1, 2.
(2) the external force power that landslide body gravity load is done is calculated according to the following formula:
In formula: WrThe external force power done by gravity load；γ is country rock severe；V is the discontinuous velocity on the plane of fracture.
Landslide energy dissipated power in vivo is calculated according to the following formula:
In formula: EDFor interior energy dissipated power；C is cohesion.
(3) landslide safety coefficient is calculated according to the following formula:
When K is less than 1, then tunnel needs supporting, and the minimal support power that support reinforcement provides is determined by following formula:
In formula: p is the minimal support power that support reinforcement parameter provides.
And on the basis of determining minimal support power, the thickness of gunite concrete when support reinforcement is determined by the following:
In formula: dsFor the thickness of gunite concrete；σcIt, can be according to gunite concrete for the compression strength of gunite concrete
Strength grade obtain.After the strength grade for determining injection gunite concrete, σ can be obtainedc；It may thereby determine that spray-up
Minimum jet thickness.
It is 14m for tunnel excavation span, country rock severe γ is 25kN/m3, cohesion c is 75kPa, and internalfrictionangleφ is
36 °, then according to safety coefficient calculation formula in implementation steps (3), 2. available different continuous landslide bodies centres prism is grown
It spends the safety coefficient under L, sees Fig. 3, i.e., continuously landslide range is bigger, then safety coefficient is smaller, when L/D is about 1, i.e. when 14m, peace
Overall coefficient is in critical state；Required supporting power is further acquired, sees Fig. 4；The injection coagulation for being C20 according to strength grade
Soil carries out supporting, then basisAvailable minimum jet thickness such as Fig. 5.
Claims (6)
1. a kind of tunnel three-dimensional is longitudinally continuous the determination method of landslide safety and supporting parameter, include the following steps: that (1) will even
Continuous landslide section landslide body is divided into three parts: being located in the middle a prism and is two hemivertebras positioned at both ends；And it calculates and collapses
The height and volume of cube；
(2) the external force power and the internal energy dissipated power of landslide that landslide body gravity load is done are calculated；
(3) landslide safety coefficient is calculated；And judge whether to need supporting, if desired supporting, calculate the minimum that support reinforcement provides
Supporting power, and determine supporting when gunite concrete thickness.
2. tunnel three-dimensional according to claim 1 is longitudinally continuous the determination method of landslide safety and supporting parameter, step
(1) in, the height and volume for the body that caves in are calculated as follows:
In formula: h is landslide body height；D is that Rectangular Tunnel excavates span；φ is country rock internal friction angle；L is landslide body intermediate cylinder
Length；π is pi, VBodyFor the volume for the body that caves in.
3. tunnel three-dimensional according to claim 2 is longitudinally continuous the determination method of landslide safety and supporting parameter, step
(2) in, the external force power that landslide body gravity load is done is calculated according to the following formula:
In formula: WrThe external force power done for landslide body gravity load；γ is country rock severe；V is the discontinuous velocity on the plane of fracture.
4. tunnel three-dimensional according to claim 3 is longitudinally continuous the determination method of landslide safety and supporting parameter, step
(2) in, landslide energy dissipated power in vivo is calculated according to the following formula are as follows:
In formula: EDFor interior energy dissipated power；C is cohesion.
5. tunnel three-dimensional according to claim 4 is longitudinally continuous the determination method of landslide safety and supporting parameter, step
(3) in, safety coefficient of caving in are as follows:
If K, less than 1, tunnel needs supporting, the minimal support power that support reinforcement provides is determined by following formula:
In formula: p is the minimal support power that support reinforcement parameter provides.
6. tunnel three-dimensional according to claim 4 is longitudinally continuous the determination method of landslide safety and supporting parameter, step
(3) in, the thickness of gunite concrete when support reinforcement is determined by the following:
In formula: dsFor the thickness of gunite concrete；σcFor the compression strength of gunite concrete, according to the intensity etc. of gunite concrete
Grade obtains.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009119960A1 (en) * | 2008-03-28 | 2009-10-01 | Mine Reclamation Corp. | Three-dimensional implementation method of mine tunnel |
| CN107526873A (en) * | 2017-07-27 | 2017-12-29 | 西安理工大学 | A kind of shallow tunnel wall damage pattern-recognition and Calculation of support method |
| CN107701194A (en) * | 2017-09-14 | 2018-02-16 | 中铁十九局集团第二工程有限公司 | A kind of construction method repaired to tunnel after landslide |
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2019
- 2019-07-30 CN CN201910693461.4A patent/CN110378067B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009119960A1 (en) * | 2008-03-28 | 2009-10-01 | Mine Reclamation Corp. | Three-dimensional implementation method of mine tunnel |
| CN107526873A (en) * | 2017-07-27 | 2017-12-29 | 西安理工大学 | A kind of shallow tunnel wall damage pattern-recognition and Calculation of support method |
| CN107701194A (en) * | 2017-09-14 | 2018-02-16 | 中铁十九局集团第二工程有限公司 | A kind of construction method repaired to tunnel after landslide |
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