三峡千将坪滑坡滑动带土的非饱和蠕变模型  

Unsaturated Creep Model of the Sliding Zone Soils of Qianjiangping Landslide in Three Gorges

作　　者：赖小玲[1] 刘印 秦洪斌 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,443002 [2]不详

出　　处：《灾害与防治工程》2009年第1期41-46,共6页Disaster and Control Engineering

摘　　要：为定量研究降雨和库水位变动情况下的滑坡蠕滑变形特性,进行了三峡千将坪滑坡滑带土的非饱和三轴排水蠕变试验研究,得出了该滑带土在相同净围压,不同基质吸力下的一组蠕变曲线,在此基础上,类比Singh-Mitchell及Mesri蠕变模型的建模思想,并根据试验曲线自身的特点,给出了适合该滑动带土的非饱和蠕变模型,即剪应力-应变关系采用幂次函数,应变-时间关系采用双曲线函数。拟合结果表明,该模型能够较好地拟合试验曲线,为预测滑坡在库水或降雨作用下的长期稳定性提出了参考意见。To investigate the impacts of rainfall and reservoir water fluctuation on creep behavior of Qianjiangping landslide, a set of unsaturated drained triaxial creep tests of the sliding zone soils have been carried out. Through summarizing test results, a series of stress-strain-time curves are obtained under constant net confining pressures and decreasing matric suctions. Based on these tests results and by analogy of Singh-Mitchell and Mesri creep models, an unsaturated creep model of the sliding zone soils is presented in accordance with the characteristics of test curves. In the model, a power function is adopted for shear stress-strain behavior and a hyperbolic function for strain-time behavior. Fitting results show that the predicated results are in good agreement with the experimental results, which may provide some suggestions for the long-term stabilization of landslides under the influence of rainfall and reservoir water fluctuation.

关 键 词：滑动带土 非饱和三轴蠕变试验 非饱和蠕变模型 应力-应变-时间关系 

分 类 号：P642.22[天文地球—工程地质学] TU433[天文地球—地质矿产勘探]