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Method for predicting stratified rock mass underground cavern surrounding rock failure type in high ground stress region

A technology of underground caverns and high ground stress, applied in the direction of prediction, data processing applications, special data processing applications, etc.

Active Publication Date: 2017-07-14
POWERCHINA CHENGDU ENG
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Problems solved by technology

However, there is currently no method for predicting the failure type of surrounding rock in underground caverns in high geostress areas.

Method used

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  • Method for predicting stratified rock mass underground cavern surrounding rock failure type in high ground stress region
  • Method for predicting stratified rock mass underground cavern surrounding rock failure type in high ground stress region
  • Method for predicting stratified rock mass underground cavern surrounding rock failure type in high ground stress region

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Embodiment Construction

[0025] A method for predicting the failure type of surrounding rock in layered rock underground caverns in high geostress areas, which is used for the maximum principal stress σ of surrounding rock max ≥20MPa high ground stress area, and the saturated uniaxial compressive strength R of the surrounding rock b The working conditions of ≥60MPa include the following steps:

[0026] A. Carry out geological survey on the underground cavern project area, including arranging adit and drilling exploration work, ascertaining the lithology conditions of the surrounding rock of the underground cavern in the survey area; Geological formations are divided into n groups, where n is a positive integer. When n is set to 1, it is equivalent to no division of engineering geological rock formations.

[0027] B. Select representative rocks from the surrounding rocks of the cavern, conduct saturated uniaxial compressive strength tests respectively, and obtain the saturated uniaxial compressive st...

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Abstract

The invention discloses a method for predicting the stratified rock mass underground cavern surrounding rock failure type in a high ground stress region, and relates to the field of rock-soil and water conservancy and hydropower engineering. The technical scheme adopted by the invention comprises the steps of A, performing geological survey, and carrying out engineering geological rock division by combining engineering significance and scale; B, selecting representative rocks, and performing a saturated uniaxial compression strength test on the selected rocks respectively, carrying out generalization on each engineering geological rock group according to the representative rocks, calculating the content of each representative rock in each engineering geological rock group, and then calculating the comprehensive compression strength Rbz of each engineering geological rock group by taking the content as a weight; C, conducting a three-dimensional space stress test, and acquiring the maximum principal stress [sigma]max; D, respectively calculating a strength-stress ratio SQ of each part of the cavern surrounding rock; and E, judging the failure type and occurrence probability of each part of the cavern surrounding rock. The method disclosed by the invention has important engineering significance for guiding a large underground cavern excavating and supporting method, parameter selection, supporting strength and engineering economic comparison and selection and the like.

Description

technical field [0001] The invention relates to the field of geotechnical and water conservancy and hydropower engineering, in particular to a method for predicting the failure type of surrounding rocks in high ground stress areas and under the excavation conditions of large underground caverns. Background technique [0002] With the continuous increase in the development of geotechnical and water conservancy and hydropower engineering resources, the excavation of underground caverns such as urban underground spaces and underground water diversion power generation systems has further developed towards high side walls and large spans. In order to meet different functional requirements and use effects , the caverns are interlaced and connected with each other in a limited space, forming a large-scale and complex underground cavern group. At present, my country's water conservancy and hydropower projects are further expanding to the western alpine and canyon regions and areas w...

Claims

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/06G06F17/50
CPCG06F30/13G06Q10/04G06Q50/06
Inventor 杨静熙梅稚平宋胜武陈卫东刘忠绪
Owner POWERCHINA CHENGDU ENG
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