锦屏二级水电站皮带机隧洞关键块体的概率分析  

Probability analysis of key blocks in Jinping II hydropower station conveyor tunnel

作　　者：梁宁[1,2] 伍法权[1] 刘彤[1] 刘建友[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院研究生院,北京100049

出　　处：《水文地质工程地质》2009年第3期86-89,共4页Hydrogeology & Engineering Geology

基　　金：三峡库区高切坡防护工程科研项目(2008SXG01-5)

摘　　要：锦屏二级水电站皮带机隧洞岩体不连续面发育,确定隧洞开挖面是否可能产生关键块体具有重要实际意义。在对皮带机隧洞详细的地质调查和研究基础上,把随机概率模型引入关键块体理论,分析锦屏二级水电站皮带机隧洞关键块体的滑落概率,得出迹长和关键块体失稳的概率为反比关系,皮带机隧洞各主要结构面迹长为1~3m的概率较高,含结构面J2的关键块体相对稳定以及顶拱圈的加固将成为皮带机隧洞的支护重点等结论,为设计有效的加固方案提供了依据,具有重要的工程应用价值。There are a lot of discontinuous planes in rock mass of Jinping II hydropower station conveyor tunnel, so it is of practical value to make certain whether there are key blocks on excavation planes where joints interlace with each other. In this paper, the stochastic probability model is drawn into key block theory to study the sliding probability of key block in Jinping II hydropower station conveyor tunnel on the basis of detailed geologic investigation. And some following conclusions are obtained. The relationship between trace length and the probability of instability of key block is inverse ratio. The probability of primary structural planes with 1 - 3m trace length is relatively higher. Key block containing structural plane J2 is relatively stable and the reinforcement of the arch would be crucial in the conveyor tunnel. These are all useful to offer effective reinforcement design and have important engineering values.

关 键 词：关键块体理论 概率分析 隧洞 

分 类 号：TU457[建筑科学—岩土工程]