Surrounding rock rapid grading method for large-span underground cave depot

Abstract

The invention discloses a surrounding rock rapid grading method for a large-span underground cave depot. The method comprises the following steps that excavation section size data of the underground cave depot are obtained; obtaining surrounding rock classification and [BQ] y of the underground cave depot in the geological survey process; carrying out geological sketch and zoning on the excavatedsection, and respectively carrying out surrounding rock BQ value calculation on the section zoning; kv and Rc are used for correcting the cave depot span; correcting the underground water state, the structural plane occurrence and the initial crustal stress, and calculating [BQ] xz; [BQ] xz of each subarea of the section is combined with [BQ] y, the arithmetic mean value is solved, comprehensive surrounding rock grading is conducted, three-dimensional surrounding rock grading of the underground cave depot is obtained, and then subdivision and subdivision are conducted on basic surrounding rockgrading. According to the method, the influence of the size effect of the ultra-large-span underground cave depot on the compressive strength and the integrity degree of the rock is considered, so that the existing national standard surrounding rock classification standard is corrected, surrounding rock classification is more accurate, and construction is safer.

Description

Technical field [0001] The invention belongs to the technical field of geotechnical engineering, and particularly relates to a method for rapidly grading surrounding rock of a large-span underground cavern. Background technique [0002] The quality classification of surrounding rock is an indispensable and important link in the construction of geotechnical engineering. At this stage, domestic and foreign grading standards for surrounding rock quality are based on the strength and integrity of surrounding rock. In consideration of in-situ stress, groundwater, structural In the case of various factors such as surface occurrence, the surrounding rock is comprehensively evaluated through both quantitative and qualitative perspectives. These classification methods are widely used and can meet most small-span (single span <15m) underground engineering projects. Construction needs. [0003] With the construction of modern public and national defense infrastructure, there are more and ...

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is mainly aimed at the limitations of the existing surrounding rock quality classification method in super-large-span underground engineering construction, and provides a new adjustment method on the basis of the BQ method, which is commonly used in domestic engineering rock mass classification standards, so that It is suitable for all underground caverns with a single span greater than 15m

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