Stage division method for large deformations of tunnel surrounding rock in survey and design stage

A survey design and grading method technology, applied in mining equipment, earth cube drilling, mining equipment, etc., can solve the problems of low grading accuracy, difficult operation, large randomness, etc., and achieve improved grading accuracy, easy access, and indicators Choose a comprehensive effect

Active Publication Date: 2019-11-29
NORTHEASTERN UNIV
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Problems solved by technology

[0004] At present, there is still no unified standard for the classification of the large deformation of the surrounding rock of the tunnel. The classification scheme is mostly divided into 3 or 5 grades according to a single index, and the classification index is mostly the strength-stress ratio or its equivalent form, which is too simple
Among them, the invention patent applications with application numbers 201811170774.3, 201810245461.3, and 201810228740.9 respectively proposed three methods for identifying large deformations of surrounding rocks, but they are all evaluations during construction and the identification indicators are relatively simple, so they have a large impact on surrounding rocks during the survey and design stage. Deformation evaluation and grading guidance have limited significance
On the one hand, in the actual survey and design stage, it is extremely difficult to accurately obtain the in-situ paramet

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  • Stage division method for large deformations of tunnel surrounding rock in survey and design stage
  • Stage division method for large deformations of tunnel surrounding rock in survey and design stage
  • Stage division method for large deformations of tunnel surrounding rock in survey and design stage

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0051] Such as figure 1 As shown, the method for grading the large deformation of tunnel surrounding rock in the survey and design stage of the invention includes the following steps:

[0052] Step 1: Divide the large deformation grade of surrounding rock into n grades.

[0053] In this embodiment, dividing the large deformation grade of the surrounding rock into n grades includes: dividing the large deformation grade r of the surrounding rock into four grades of 0, I, II, and III; wherein, grade 0 represents no large deformation, and grade I , II, III represent large deformation and the severity is intensified sequentially, r=0 represents ε≤3%, r=I represents 3%8%, ε is the relative deformation amount, and the relative deformation amount is the ratio of the absolute deformation amount to the equivalent radius of the tunnel. The characteristi...

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Abstract

The invention relates to the technical field of rock mass engineering, and provides a stage division method for large deformations of tunnel surrounding rock in a survey and design stage. Firstlylargedeformation grades of the surrounding rock are divided into n grades; then the maximum principal stress, lithology and rock mass integrity data, and active fault data of a tunnel site area are obtained; then the maximum principal stress and the lithology and rock mass integrity data of the tunnel site area are combined for performing an initial assessment, and the maximum principal stress and theactive fault data of the tunnel site area are combined for performing a second preliminary assessment to calculate the preliminary assessment grade of the surrounding rock large deformation in the tunnel site area; then groundwater situation data, the angle between the rock layer direction and the tunnel axis, and the inclination of the rock layer in the tunnel site area are obtained and combinedto calculate grade correction parameters to correct the preliminary assessment grade of the surrounding rock large deformations in the tunnel site area to obtain the surrounding rock large deformation correction level in the tunnel site area. According to the stage division method for the large deformations of the tunnel surrounding rock in the survey and design stage, the risk level of the large-scale deformation disaster of the surrounding rock in the survey and design stage can be evaluated, index selection is relatively comprehensive and easy to obtain, and thus the grade division accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of rock mass engineering, in particular to a method for grading the large deformation of tunnel surrounding rock in the survey and design stage. Background technique [0002] The large deformation of the surrounding rock is a phenomenon in which the rock mass around the excavation surface of the underground engineering forms a significant deformation under the action of engineering disturbance stress and expansion stress, which exceeds the allowable value of the engineering design. The large deformation of the surrounding rock under high stress extrusion usually has the characteristics of large deformation, high deformation rate, long duration, various support failure forms, and large damage range of the surrounding rock, which will cause great damage to the normal construction and operation of the tunnel. threats to personal safety and economic losses. [0003] At present, my country's infrastructure const...

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Application Information

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IPC IPC(8): E21F17/00
CPCE21F17/00
Inventor 冯夏庭周扬一刘旭锋刘造保于小军侯思雨王飞燕赵曰茂韩勇
Owner NORTHEASTERN UNIV
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