锦屏水电站左岸拱间槽坡内洞室开挖对边坡稳定的影响分析  

An Analysis of Effect of Inner Cavern Excavation in Left Bank Trench Slopes between Aches upon Side Slope Stability at Jinping Hydropower Station

作　　者：姚显春[1] 李宁[1,2] 张承客[1] 

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]中国科学院寒区旱区环境与工程研究所冻土工程国家重点试验室,甘肃兰州730000

出　　处：《西安理工大学学报》2012年第3期278-283,共6页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(50879068);国家自然科学基金创新群体资助项目(40821001)

摘　　要：以锦屏水电站左岸拱间槽坡内洞室开挖引起的边坡稳定分析问题为例,构建基于洞室群开挖对已有边坡的稳定性影响分析方法,为实际工程设计提供分析基础。通过洞群开挖时引起的坡体滑面处的应力的变化,把洞群开挖引起的坡体应力变化看成是渐进式变化过程,得到边坡整体安全系数的评价公式。采用有限元数值模拟方法,对锦屏一级水电站左岸拱肩槽边坡,通过分析坡内洞室开挖引起的坡体应力变化调整,分析研究坡体潜在滑面上的安全形态变化规律。系统模拟了由于洞室开挖引起坡体的应力调整变化,较真实地分析了边坡潜在滑动面超限应力的逐级释放、转移过程,进而根据滑面应力调整结束后的滑面真实应力分析了其安全系数的变化规律。Taking the analysis of slope stability problem caused by the inner cavern excavation in left bank trench slopes between arches at Jingping hydropower station as an example,an analytical method based on the effect of cavern group excavation upon the existing slope stability is established in this paper,whereby providing the analysis foundation for the practical engineering design.Through analysis of the stress change on the slope sliding surface caused by cavern excavation,the changes in slop body stress caused by cavern excavation can be considered as a gradual changing process,whereby obtaining the evaluation formula for the slope overall safety factor.The FEM numerical simulation method is used to analyze the slope of the left bank arch shoulder of Jingping primary hydropower station,to regulate the slope body stress changes caused by the slope inner cavern excavation and to analyze and study the safety morphological changing laws on the latent sliding surface of slope body.The slope body stress regulation changes caused by the cavern excavation are systematically simulated.The gradual release and transfer process of over limited stress in slope latent sliding surface are truly analyzed.Furthermore,the safety factor changing laws are analyzed in terms of sliding surface true stress after the end of sliding surface stress regulating.

关 键 词：岩石力学 隧洞 边坡 稳定分析 有限元 

分 类 号：O319.56[理学—一般力学与力学基础]