UNSATURATED CREEP MODEL OF THE SLIDING ZONE SOILS OF QIANJIANGPING LANDSLIDE IN THREE GORGES AND ITS EMPIRICAL MODELS
The displacements and long-term stabilization of large-scale landslides in Three Gorges Area importantly depend on the time-effect of the mechanical characters of sliding zone soils under the influence of water. To investigate impacts of rainfall and reservoir water fluctuation on the creep behaviour of Qianjiangping landslide, two sets of unsaturated drained triaxial creep tests of the sliding zone soils have been carried out. Through summarizing test results, a series of stress-straintime curves are obtained under constant net confining pressures and decreasing matric suctions. Based on test results and by using Singh-Mitchell creep model for reference, a new stress intensity including matric suction has been defined and thus a group of unsaturated creep models of the sliding zone soils are presented in this paper. In each of these models, the exponential function is adopted for shear stressstrain behavior and the power function for straintime behavior. In the end, relationships between matric suctions and parameters of the creep models have been analyzed to further reveal mechanism of matric suction on the creep behavior of Qianjiangping landslide. This study has provided calculation model and parameters for the long-term stability of landslides under the influence of rainfall and reservoir water fluctuation.
Sliding zone soils matric suction unsaturated drained triazial creep test unsaturated creep model stress-strain-time behavior
X.L. Lai S.M. Wang H.B. Qin X.F. Liu
Key Laboratory of Geological Hazards in Three Gorges Reservoir Area of Education Ministry, China Three Gorges University, Yichang, Hubei 443002,China
国际会议
上海
英文
290-297
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）