长江科学院院报Issue(4)：71-76,6.DOI:10.3969/j.issn.1001-5485.2015.04.014
锦屏二级水电站引水隧洞围岩岩爆特性研究
Rockburst Features of the Surrounding Rock in Jinping Second-stage Hydropower Station’s Diversion Tunnel
摘要
Abstract
Rock mechanics tests were conducted on typical rockburst specimens to investigate the rockburst features in the diversion tunnel of Jinping second-stage hydropower station.Test results show that the rock samples are com-plete and hard of high compression strength,with brittle failure as the main failure mode.The rockburst proneness indexes (Wet )of typical strata are larger than 2.0,and rockburst feature is obvious in high geostress area.In the unloading process,the dilatancy of rock specimens is more obvious when the initial unloading confining pressure gets higher.The axial strain of rock specimens when stress falls after peak changes less than that by conventional triaxial tests,and the brittle failure is more obvious when confining pressure gets higher.CT scanning and image re-formation results suggest that during the unloading,the rock specimens experience the stage of compaction,state of dilatancy until failure,and then stage of density springback after failure.During the unloading test,failure happens instantly mostly with sounds and double shear damage.Hence the new rockburst criterion and classification stand-ard are proposed using the basic quality indicators of rock mass to describe the hardness and integrity degree of rock.The rock mechanics test results verified the criterion and classification which agree well with the rockburst properties in Jinping second-stage hydropower station.关键词
锦屏二级水电站/隧洞围岩/岩爆/高应力/试验研究/CT扫描断面Key words
Jinping Second-stage Hydropower Station/surrounding rock of tunnel/rock burst/high stress/experi-mental investigation/CT scanning section分类
建筑与水利引用本文复制引用
蒋昱州,王瑞红,汪斌,朱杰兵..锦屏二级水电站引水隧洞围岩岩爆特性研究[J].长江科学院院报,2015,(4):71-76,6.基金项目
国家自然科学基金项目（51109014，51109120，41272350）；国家重点基础研究发展计划（973）项目 （）
