A quantitative evaluation method for the rockburst proneness of surrounding rock considering the excavation disturbance effect

Through engineering geological survey and Hoek-Brown intensity criterion combined with acoustic wave testing, the residual elastic performance index AEF was used to solve the cumbersome and misjudgment problems of surrounding rock burst tendency evaluation, and a fast and accurate evaluation of surrounding rock burst tendency was achieved.

CN115468531BActive Publication Date: 2025-07-25SOUTHEAST UNIV
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Patent Information

Application Number
CN202211032650.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-26
Publication Date
2025-07-25
Estimated Expiration
2042-08-26

AI Technical Summary

Technical Problem

When evaluating the tendency of surrounding rock explosions caused by excavation disturbance effects, the prior art has cumbersome processes and many misjudgments, making it difficult to quickly and accurately evaluate the tendency of surrounding rock explosions of different degrees of damage.

Method used

The basic quality level and uniaxial compressive strength of the surrounding rock were obtained through engineering geological survey data, combined with Hoek-Brown strength criterion and acoustic test, the damage factor and deformation modulus were determined, and the residual elasticity index AEF was used to evaluate the rock burst tendency of the surrounding rock, and avoid on-site sampling tests.

Benefits of technology

The rapid and accurate evaluation of the tendency of surrounding rock explosions is achieved, and the excavation disturbance effect is taken into account. It is suitable for surrounding rocks of different degrees of damage, reducing economic costs and operational complexity.

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Abstract

The present invention relates to a quantitative evaluation method for the rockburst proneness of surrounding rock considering the excavation disturbance effect. The basic quality grade, geological strength index, and uniaxial compressive strength of intact rock of the surrounding rock are directly obtained according to the engineering geological exploration data; preliminarily judge whether the surrounding rock has the proneness to rockburst; judge the on-site acoustic wave test conditions of the surrounding rock. If the conditions are not met, the damage factor characterizing the damage degree of the surrounding rock is determined according to the Hoek-Brown strength criterion in combination with the damage situation of the surrounding rock after excavation on-site; if the conditions are met, the acoustic wave velocities at different depths on the surface of the surrounding rock are obtained, and the ranges of the damaged area and the original rock area are determined; the deformation modulus of the rock mass in the original rock area is determined; the rockburst proneness of the rock mass in the original rock area and the damaged area is evaluated; the present invention aims to solve the problem of the cumbersome evaluation process for the rockburst proneness of surrounding rock with different degrees of damage caused by the excavation disturbance effect, so as to realize the rapid evaluation of the rockburst proneness of the surrounding rock.
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