CAJ | 학술논문

针对在锦屏二级水电站引水隧洞中出现的大理岩滞后破裂现象,采用试验、监测、理论分析等手段综合分析了此现象的内在机理.锦屏二级引水隧洞的最大埋深2525 m,应力和岩体强度之间的矛盾尖锐,埋深的变化导致属于脆性岩石的大理岩也出现了破裂扩展的现象.借助室内压缩试验确定破裂为大理岩的主要开挖响应方式,现场布置的锚杆应力计测量结果及声波测试结果都表明深埋大理岩存在破裂随时间扩展的特点;采用基于应力腐蚀理论开发的应力腐蚀模型PSC可以很好地模拟这一现象.
침대재금병이급수전참인수수동중출현적대리암체후파렬현상,채용시험、감측、이론분석등수단종합분석료차현상적내재궤리.금병이급인수수동적최대매심2525 m,응력화암체강도지간적모순첨예,매심적변화도치속우취성암석적대리암야출현료파렬확전적현상.차조실내압축시험학정파렬위대리암적주요개알향응방식,현장포치적묘간응력계측량결과급성파측시결과도표명심매대리암존재파렬수시간확전적특점;채용기우응력부식이론개발적응력부식모형PSC가이흔호지모의저일현상.
The deep-buried marble in the headrace tunnel of JinpingIIHydropower Station exhibit time-dependent failure. The internal mechanism of the phenomenon is comprehensively analyzed by means of tests, monitoring and theoretical analysis. The largest buried depth of the headrace tunnel reaches 2 525 m, and the contradiction between the stress and rock mass strength is sharp. The variation of buried depth makes the marble which belongs to brittle rock also exhibit the phenomenon of fracture extension with time. The fracture is regarded as the main excavation response based on the laboratory compression tests. The field anchor stress meters and acoustic wave tests show the time-dependent failure characteristics of deep-buried marble. The parallel-bonded stress corrosion model based on the stress corrosion theory can be employed to satisfactorily simulate such phenomenon.