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Method for comparison and selection of underground cavern group arrangement schemes under high ground stress condition

A layout scheme and technology for underground caverns, which are applied in mining equipment, earthwork drilling, mining equipment, etc., can solve the problems of complex surrounding rock stability of large underground caverns, many influencing factors, and comparison of layout schemes, etc. Effects of engineering safety and techno-economics

Pending Publication Date: 2021-07-23
POWERCHINA HUADONG ENG COPORATION LTD +2
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Problems solved by technology

However, due to the complexity of the surrounding rock stability of large-scale underground caverns and the many influencing factors, simple engineering analogy and empirical evaluation methods cannot be used to compare layout schemes. Therefore, a quantitative analysis method that can consider multi-index systems is needed

Method used

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  • Method for comparison and selection of underground cavern group arrangement schemes under high ground stress condition
  • Method for comparison and selection of underground cavern group arrangement schemes under high ground stress condition
  • Method for comparison and selection of underground cavern group arrangement schemes under high ground stress condition

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.

[0048] like Figure 1-Figure 3 As shown, the present invention provides a method for comparison and selection of underground cavern group layout schemes under high ground stress conditions, comprising the following steps:

[0049] S1: In the underground engineering area, use on-site drilling and drilling to find out the geometric boundaries of stratum lithology and geological structure 6, use rock mass quality evaluation and test methods to determine rock mass types and mechanical parameters, and use hydraulic fracturing or stress relief method for in-situ stress measurement, determine the initial maximum in-situ stress direction and magnitude through regression analysis, and carry out inversion demonstration based on the high-stress failure phenomenon of surrounding rocks, etc., based on the geolog...

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Abstract

The invention provides a method for comparison and selection of underground cavern group arrangement schemes under a high ground stress condition. The method comprises the following steps of S1, ascertaining geometric boundaries of stratum lithology and geologic structures, determining rock mass categories and mechanical parameters, measuring ground stress and returning to an initial stress field so as to draw up a plurality of feasible underground cavern group macroscopic arrangement schemes; S2, adopting a three-dimensional discrete element method to calculate and analyze excavation and support processes of each scheme in the step S1, and extracting various calculation indexes through built-in FISH language programming; and S3, through comparison of five calculation indexes reflecting the surrounding rock stability degree, namely excavation energy release rate levels, surrounding rock high stress concentration volumes, continuous medium large deformation volumes, structural plane control type block volumes and plastic zone volumes of different arrangement schemes, establishing a superior selection and inferior elimination evaluation system adapted to engineering characteristics. The optimization of the arrangement schemes under the multi-factor constraint condition is realized.

Description

technical field [0001] The invention relates to the field of underground space engineering such as hydropower and water conservancy, and in particular to a method for comparing and selecting layout schemes of underground cavern groups under high ground stress conditions. Background technique [0002] The scale of hydropower projects in western my country is getting larger and larger. The span of the underground powerhouse is on the order of 20-35m, and the diameter of the cylindrical tailwater surge chamber is on the order of 40-50m. However, due to the special dynamic environment of the lithosphere in the western region, there are The characteristics of strong activity, high seismic intensity, high in-situ stress level and developed geological structure make the contradiction between the grand project scale and the complexity of geological conditions prominent, showing the diversity and complexity of rock mechanics problems, especially the high in-situ stress The resulting br...

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Application Information

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IPC IPC(8): E21D9/14E21F17/18E21F17/00
CPCE21D9/14E21F17/18E21F17/00
Inventor 孟国涛陈建林汪志林陈浩王玮徐剑陈平志吴家耀段兴平王鹏飞
Owner POWERCHINA HUADONG ENG COPORATION LTD
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