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Predicting the excavation damaged zone within brittle surrounding rock masses of deep underground caverns using a comprehensive approach integrating in situ measurements and numerical analysis

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Geoscience Frontiers 2022年第2期13卷 186-199页

作者： Ding-Ping Xu Xiang Huang Shao-Jun Li Huai-Sheng Xu Shi-Li qiu Hong Zheng quan Jiang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

Excavation Damaged Zone(EDZ)scope is important for optimizing excavation and support schemes in deep underground ***,accurately predicting the full EDZ scope within the surrounding rock masses of deep underground caverns during excavation remains a pressing *** study presents a comprehensive EDZ scope prediction approach(CESPA)for the brittle surrounding rock masses of deep underground caverns by coupling numerical simulation with quantitative analysis of borehole wall images and ultrasonic test ***,the changes in both P-velocity(V_(p))and joint distribution of the surrounding rock masses before and after excavation damage are captured using ultrasonic tests and borehole digital ***,the quality q-parameters of the surrounding rock mass before and after excavation damage are preliminarily rated with the rock mass descriptions provided by borehole wall images,and the rock mass V_(p)-parameter values are determined according to the V_(p)-borehole depth ***,the q-parameter ratings are further finely adjusted by updating the related q-values to be similar with the q-values estimated by V_(p)-parameter ***,the initial and residual mechanical parameters for the rock mass deterioration model(RDM)are estimated by the adjusted q-parameter ratings based on the modified q-based relations,and the elastic modulus deterioration index(EDI)threshold to describe the EDZ boundary is determined with the V_(p)-parameter ***,EDZ scope is predicted using the elastoplastic numerical simulation with RDM and EDI based on the mechanical parameter estimates and EDI *** of applications in Sub-lab D1 in Jinping II project show that CESPA can provide a reliable and operable solution for predicting full EDZ scopes within the brittle surrounding rock masses of deep underground caverns.

关键词： Excavation damaged zone Borehole digital camera Ultrasonic test q-system Rock mass deterioration model

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