西南某水电站工程边坡软岩时效变形特性研究  

Study on Time-Dependent Deformation of Soft Rock of the Engineering Slope in a Hydroelectric Station in Southwest of China

作　　者：郑海君[1] 张品萃[1] 曹运江[1] 付小敏[1] 谭文俊[2] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家专业实验室,成都610059 [2]四川准达岩土工程公司,成都610072

出　　处：《水土保持研究》2007年第3期192-194,199,共4页Research of Soil and Water Conservation

基　　金：地质灾害防治与地质环境保护国家专业实验室开放基金资助(项目编号:GZ2005-07)

摘　　要：以研究西南某大型水电站大坝在蓄水后的长期稳定性为背景,以室内饱水直剪流变试验为手段,系统地研究了坝区内高边坡软岩的流变特性。通过对所有流变曲线的分析,获得了长期强度参数,并建立了各种类型软岩和软弱结构面的时效本构方程,得出该区软岩在饱水状态下,长期强度参数较瞬时变形降低了约60%。结论表明该区软岩的时效变形很明显,这个特性是坝区多个开挖边坡可能沿软岩蠕滑拉裂破坏的潜在因素,表明其存在对边坡及未来的稳定性起主要的控制作用。To study long-time stability of dam of a southwestern hydropower station after sluicing, the rheology properties of soft rock are researched by laboratory long-term direct shear in the saturated situation, the time-dependent deformation characteristics studying on the high slope soft rock and the weak structural plane have been done systematically. Through the analysis of all of the curves, the long-time strength parameters were acquired, and the time-dependent constitutive equation of each type of soft rocks and weak structural planes was established, the long-time cohesive force of the weak structural plane decreased about 60% in contrast with that of saturated quick shear test. The results indicate that time-dependent deformation of soft rock is also obvious and would be the potential factor to make the excavated slope creep-ripredly destructed along the soft rock and to play a mainly controlling role to the long-term stability.

关 键 词：软岩 流变试验 时效本构方程 边坡稳定性 

分 类 号：P642.4[天文地球—工程地质学] TV742[天文地球—地质矿产勘探]