锦屏二级水电站深埋大理岩破裂扩展的时间效应  

Time-dependent failure of deep-buried marble in Jinping Ⅱ Hydropower Station

作　　者：刘宁[1] 张春生[1] 吴旭敏[1] 褚卫江[1] 

机构地区：[1]中国水电顾问集团华东勘测设计研究院,浙江杭州310014

出　　处：《水利水电科技进展》2013年第2期63-67,共5页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金青年科学基金(51109221);浙江省博士后择优资助(2011-bsh-019)

摘　　要：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。The deep-buried marble in the headrace tunnel of Jinping Ⅱ Hydropower 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.

关 键 词：大理岩 破裂 时间效应 引水隧洞 锦屏二级水电站 

分 类 号：TV223.1[水利工程—水工结构工程]