Characteristics of microseismic b-value associated with rock mass large deformation in underground powerhouse caverns at different stress levels

作     者：LI Biao DING Quan-fu XU Nu-wen DAI Feng XU Yuan QU Hong-lue 李彪;丁泉富;徐奴文;戴峰;许媛;曲宏略

作者机构：School of Geoscience and TechnologySouthwest Petroleum UniversityChengdu 610500China State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijing 100081China State Key Laboratory of Hydraulics and Mountain River EngineeringCollege ofWater Resource and HydropowerSichuan UniversityChengdu 610065China Department of Engineering ScienceUniversity of OxfordOX51PFUnited Kingdom 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2022年第29卷第2期

页      面：693-711页

核心收录：

学科分类：081504[工学-水利水电工程] 08[工学] 0815[工学-水利工程] 081503[工学-水工结构工程] 

基　　金：Projects(51809221,51679158)supported by the National Natural Science Foundation of China Project(KFJJ20-06M)supported by the State Key Laboratory of Explosion Science and Technology(Beijing Institute of Technology),China 

主　　题：underground powerhouse caverns rock mass large deformation stress level microseismic monitoring bvalue 

摘      要：Rock mass large deformation in underground powerhouse caverns has been a severe hazard in hydropower engineering in Southwest *** the development of rock mass large deformation,a sequence of fractures was generated that can be monitored using microseismic(MS)monitoring *** MS monitoring systems were established in two typical underground powerhouse caverns featuring distinct geostress *** MS b-values associated with rock mass large deformation and their temporal variation are *** results showed that the MS bvalue in course of rock mass deformation was less than 1.0 in the underground powerhouse caverns at a high stress level while larger than 1.5 at a low stress *** to the rock mass deformation,the MS b-values derived from both the high-stress and low-stress underground powerhouse caverns show an incremental decrease over 10%within 10 *** results contribute to understanding the fracturing characteristics of MS sources associated with rock mass large deformation and provide a reference for early warning of rock mass large deformation in underground powerhouse caverns.