CN114060086B - Method for judging deformation of extrusion surrounding rock tunnel - Google Patents
Method for judging deformation of extrusion surrounding rock tunnel Download PDFInfo
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- CN114060086B CN114060086B CN202111366421.2A CN202111366421A CN114060086B CN 114060086 B CN114060086 B CN 114060086B CN 202111366421 A CN202111366421 A CN 202111366421A CN 114060086 B CN114060086 B CN 114060086B
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- 239000011435 rock Substances 0.000 title claims abstract description 78
- 238000001125 extrusion Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000009412 basement excavation Methods 0.000 claims description 6
- 238000013441 quality evaluation Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- YBJHBAHKTGYVGT-ZKWXMUAHSA-N (+)-Biotin Chemical compound N1C(=O)N[C@@H]2[C@H](CCCCC(=O)O)SC[C@@H]21 YBJHBAHKTGYVGT-ZKWXMUAHSA-N 0.000 abstract description 4
- FEPMHVLSLDOMQC-UHFFFAOYSA-N virginiamycin-S1 Natural products CC1OC(=O)C(C=2C=CC=CC=2)NC(=O)C2CC(=O)CCN2C(=O)C(CC=2C=CC=CC=2)N(C)C(=O)C2CCCN2C(=O)C(CC)NC(=O)C1NC(=O)C1=NC=CC=C1O FEPMHVLSLDOMQC-UHFFFAOYSA-N 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000011160 research Methods 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 5
- 238000010276 construction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to a method for judging the deformation of an extrusion surrounding rock tunnel, which comprises the following steps: collecting tunnel engineering basis data, comprising: a tunnel axis azimuth angle theta, tunnel rock formation, lithology, a rock formation inclination angle alpha, a rock formation strike azimuth angle gamma, an included angle beta between a rock formation strike and a tunnel axis, and a rock formation integrity coefficient Kv; calculating a ground stress influence factor S; calculating a rock deformation influence factor K; and judging the deformation condition of the compressive surrounding rock tunnel by utilizing a judging method of the deformation of the compressive surrounding rock tunnel according to the ground stress influence factor S and the rock deformation influence factor K. The invention further researches the internal and external factors influencing the deformation of the extrusion surrounding rock tunnel, adopts two factors of ground stress and surrounding rock mass deformation to scientifically predict the deformation, has the advantages of simple parameter acquisition, high accuracy and convenient operation, has the advantages of strong pertinence and high reliability, and improves the design accuracy.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a method for judging deformation of an extrusion surrounding rock tunnel.
Background
The construction of the extrusion surrounding rock tunnel engineering is a great engineering difficulty at present. The compressive surrounding rock has weak lithology, small strength stress ratio and poor stability, is extremely easy to generate compressive large deformation under high ground stress environment, has the characteristics of high deformation rate, large deformation and long duration, and has the phenomena of cracking and falling blocks of primary support sprayed concrete, distortion and fracture of a steel frame, instability and limit invasion damage of the primary support, and the like, so that construction safety and structural operation safety face extremely challenges.
The first difficulty faced by the design and construction of the extrusion surrounding rock tunnel is scientific prediction of deformation, reasonable reserved deformation is formulated, and a foundation is laid for the formulation of tunnel structural forms and supporting parameters. At present, the deformation of the extrusion surrounding rock tunnel is determined through experience, and the engineering analogy method is adopted to determine the deformation of the extrusion surrounding rock tunnel, so that the characteristics of the extrusion surrounding rock are not deeply known, the influence factors of the extrusion surrounding rock tunnel deformation are studied, the extrusion surrounding rock tunnel deformation is not predicted accurately, the reasonable deformation cannot be set, and the problems that the support is damaged, the deformation is replaced or the pre-deformation is too large, the backfill amount is increased and waste is caused often occur.
Disclosure of Invention
The invention aims to provide a method for judging the deformation of an extrusion surrounding rock tunnel, which overcomes the technical defect of inaccurate prediction of the deformation of the extrusion surrounding rock tunnel in the existing method.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the method for judging the deformation of the compressive surrounding rock tunnel comprises the following steps:
step 1: collecting tunnel engineering basic data;
step 2: calculating a ground stress influence factor;
step 3: calculating rock deformation influence factors;
step 4: and judging the deformation of the compressive surrounding rock tunnel.
In step 1, tunnel engineering basic data are collected, wherein the tunnel engineering basic data comprise a tunnel axis azimuth angle theta, a rock stratum inclination angle alpha, a rock stratum trend azimuth angle gamma, an included angle beta between a rock stratum trend and a tunnel axis, and a rock mass integrity coefficient Kv.
The rock mass integrity coefficient is obtained through indoor test, drill core quality evaluation and tunnel face excavation disclosure.
In the step 2, the calculation method of the ground stress influence factor is as follows:
wherein S represents a ground stress influencing factor, β= |γ - θ|.
In the step 3, the calculation method of the rock mass deformation influence factor comprises the following steps:
where K represents a rock mass deformation influencing factor.
In the step 4, the method for judging the deformation of the compressive surrounding rock tunnel comprises the following steps:
u＝S×K×r
wherein u is the deformation of the tunnel, and r is the excavation radius of the tunnel.
The invention has the following advantages:
the invention further researches the internal and external factors influencing the deformation of the extrusion surrounding rock tunnel, adopts two factors of ground stress and surrounding rock mass deformation to scientifically predict the deformation, has the advantages of simple parameter acquisition, high accuracy and convenient operation, has the advantages of strong pertinence and high reliability, and improves the design accuracy.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
Referring to fig. 1, the invention relates to a method for judging the deformation of an extrusion surrounding rock tunnel, which comprises the following steps:
step 1: collecting tunnel engineering basis data, comprising: the azimuth angle theta of the tunnel axis, the tunnel rock stratum, lithology, the rock stratum inclination angle alpha, the rock stratum strike azimuth angle gamma, the included angle beta between the rock stratum strike and the tunnel axis and the rock stratum integrity coefficient Kv;
the rock stratum inclination angle alpha is an included angle between the rock stratum inclination direction and the horizontal plane, and is measured by a geological compass, wherein the range is 0-90 degrees;
the included angle beta between the stratum trend and the tunnel axis is: the stratum trend refers to the intersection line of the stratum layer and any imaginary horizontal plane, namely the connecting line of two equal-height points on the same layer, and is measured by a geological compass; after the stratum is measured, the included angle between the stratum and the tunnel axis is beta;
acquiring rock mass integrity information of a tunnel address area: according to engineering rock mass grading standard (GB/T50218), the rock mass integrity is divided into 5 grades of extremely broken, relatively broken and relatively complete; the rock integrity degree is expressed by a rock integrity index Kv; wherein the rock mass integrity coefficient Kv is less than or equal to 0.15 and is extremely broken, and the rock mass integrity coefficient is 0.15<Kv is less than or equal to 0.35 and is broken, and the integrity coefficient of the rock mass is 0.35<Kv is less than or equal to 0.55 and is broken, and the integrity coefficient of the rock mass is 0.55<Kv is less than or equal to 0.75 and is more complete, and the integrity coefficient of the rock mass is 0.75<Kv is complete; rock mass integrity factor K V The method is obtained through indoor tests, drilled rock core quality evaluation and tunnel face excavation disclosure.
Step 2: calculating a ground stress influence factor S by using a calculation method of the ground stress influence factor according to the stratum inclination angle alpha and the stratum trend and the tunnel axis included angle beta;
the calculation method of the ground stress influence factor K comprises the following steps:
wherein β= |γ - θ|;
step 3: according to the rock stratum integrity coefficient Kv, calculating a rock deformation influence factor K by using a rock deformation influence factor calculation method;
the method for calculating the rock deformation influence factor K comprises the following steps:
step 4: judging the deformation condition of the compressive surrounding rock tunnel by utilizing a judging method of the deformation of the compressive surrounding rock tunnel according to the ground stress influence factor S and the rock deformation influence factor K;
the method for judging the deformation of the extrusion surrounding rock tunnel comprises the following steps:
u＝S×K×r
wherein u is the deformation of the tunnel, and r is the excavation radius of the tunnel.
The content of the invention is not limited to the examples listed, and any equivalent transformation to the technical solution of the invention that a person skilled in the art can take on by reading the description of the invention is covered by the claims of the invention.
Claims (1)
1. The method for judging the deformation of the extrusion surrounding rock tunnel is characterized by comprising the following steps of:
the method comprises the following steps:
step 1: collecting tunnel engineering basic data;
step 2: calculating a ground stress influence factor;
step 3: calculating rock deformation influence factors;
step 4: judging the deformation of the extrusion surrounding rock tunnel;
in the step 1, collecting tunnel engineering basic data including a tunnel axis azimuth angle theta, a rock stratum inclination angle alpha, a rock stratum trend azimuth angle gamma, an included angle beta between a rock stratum trend and a tunnel axis and a rock mass integrity coefficient Kv;
in the step 1, a rock mass integrity coefficient Kv is obtained through an indoor test, a drilled rock core quality evaluation and a tunnel face excavation disclosure;
in the step 2, the calculation method of the ground stress influence factor is as follows:
wherein S represents a ground stress influencing factor, β= |γ - θ|
In the step 3, the calculation method of the rock mass deformation influence factor comprises the following steps:
wherein K represents a rock mass deformation influence factor;
in the step 4, the method for judging the deformation of the compressive surrounding rock tunnel comprises the following steps:
u＝S×K×r
wherein u is the deformation of the tunnel, and r is the excavation radius of the tunnel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111366421.2A CN114060086B (en) | 2021-11-18 | 2021-11-18 | Method for judging deformation of extrusion surrounding rock tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111366421.2A CN114060086B (en) | 2021-11-18 | 2021-11-18 | Method for judging deformation of extrusion surrounding rock tunnel |
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| Publication Number | Publication Date |
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| CN114060086A CN114060086A (en) | 2022-02-18 |
| CN114060086B true CN114060086B (en) | 2024-02-27 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017218827A (en) * | 2016-06-09 | 2017-12-14 | 公益財団法人鉄道総合技術研究所 | Estimation method of factor relevant to tunnel deformation due to plastic pressure of natural ground considering three-dimensional geological structure and examination method for comprehending range requiring countermeasure |
| CN109684744A (en) * | 2018-12-27 | 2019-04-26 | 石家庄铁道大学 | A kind of calculation method of soft rock tunnel pressure from surrounding rock |
| CN110513146A (en) * | 2019-08-30 | 2019-11-29 | 东北大学 | A kind of prospective design stage tunnel surrounding large deformation stage division |
| CN111412885A (en) * | 2020-04-23 | 2020-07-14 | 长江水利委员会长江科学院 | Large deformation prediction method for extruded surrounding rock of large buried depth tunnel |
| CN113295850A (en) * | 2021-05-24 | 2021-08-24 | 中交一公局集团有限公司 | Tunnel surrounding rock quantitative rapid grading method and device based on multi-source data fusion |
-
2021
- 2021-11-18 CN CN202111366421.2A patent/CN114060086B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017218827A (en) * | 2016-06-09 | 2017-12-14 | 公益財団法人鉄道総合技術研究所 | Estimation method of factor relevant to tunnel deformation due to plastic pressure of natural ground considering three-dimensional geological structure and examination method for comprehending range requiring countermeasure |
| CN109684744A (en) * | 2018-12-27 | 2019-04-26 | 石家庄铁道大学 | A kind of calculation method of soft rock tunnel pressure from surrounding rock |
| CN110513146A (en) * | 2019-08-30 | 2019-11-29 | 东北大学 | A kind of prospective design stage tunnel surrounding large deformation stage division |
| CN111412885A (en) * | 2020-04-23 | 2020-07-14 | 长江水利委员会长江科学院 | Large deformation prediction method for extruded surrounding rock of large buried depth tunnel |
| CN113295850A (en) * | 2021-05-24 | 2021-08-24 | 中交一公局集团有限公司 | Tunnel surrounding rock quantitative rapid grading method and device based on multi-source data fusion |
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| CN114060086A (en) | 2022-02-18 |
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