三峡泄滩滑坡滑动带土的改进Singh-Mitchell蠕变方程  

A modified Singh-Mitchell’s creep function of sliding zone soils of Xietan landslide in Three Gorges

作　　者：王琛[1] 张永丽[2] 刘浩吾[1] 

机构地区：[1]四川大学水利水电学院,四川成都610065 [2]四川大学建筑与环境学院,四川成都610065

出　　处：《岩土力学》2005年第3期415-418,共4页Rock and Soil Mechanics

基　　金：四川大学校青年基金(No.200310)。

摘　　要：进行了三峡泄滩滑坡体滑动带土的三轴排水蠕变试验研究,在此基础上给出了该滑动带土的 Singh-Mitchell 蠕变方程,即剪应力-应变关系采用指数函数,应变-时间关系采用幂函数来描述土体的流变性质。并根据分段拟合的思想,提出了改进的 Singh-Mitchell 蠕变方程,即在应变-时间幂函数中使用不同的幂值λ ,来分别模拟滑动带土的衰减、匀速和恒定蠕变。通过对比可知,改进 Singh-Mitchell 蠕变方程较 Singh-Mitchell 蠕变方程能更好地模拟流变性较小的滑动带粘土。Drained triaxial compression creep tests of sliding zone soils of Xietan landslide in the Three Gorges area have been carried out. Based on these tests, given is Singh-Mitchell’s creep model, in which exponential function is adopted for shear stress-strain behavior and a power function for strain-time behavior. A modified Singh-Mitchell’s shear stress-strain-time behavior is presented too, in which strain-time power behavior has been simulated by subsection. Through using the different power values λ , which correspond to the three phases of creep, that is , damply phase, steady phase and invariable phase respectively; the capability of simulation the creep characters of the sliding zone clay can be greatly improved. So for the clay which has less creep characters, modified Singh-Mitchell’s creep model is more reasonable than Singh-Mitchell’s creep model.

关 键 词：滑动带土 三轴蠕变试验 Singh-Mitchdl蠕变方程 应力-应变-时间关系 改进Singh—Mitchell蠕变方程 

分 类 号：TU441[建筑科学—岩土工程]