【摘要】 滑坡变形发展一般都要经历一定的时间过程,同时在降雨以及库水位变动下,滑坡土体常处于非饱和状态,因此构建考虑基质吸力的非饱和土蠕变模型具有非常重要的意义。以三峡库区某滑坡滑带土非饱和蠕变试验数据为基础,基于伯格模型和非饱和土力学原理及相关假设条件,构建了适合该滑坡滑带土的非饱和蠕变模型。接着,利用非线性回归算法对模型参数进行求解,并将该模型预测值与试验值进行对比,验证了该模型的合理性。最后,考虑模型参数与净围压之间的线性相关性,对模型进一步修正,并验证了修正后模型的有效性。构建的非饱和土蠕变模型能较好地反映该滑坡滑带土的非饱和蠕变特性,其对预测该滑坡的长期变形具有重要的意义。更多还原

【Abstract】 The development of landslide deformation usually goes through a certain period of time. At the same time, landslide soil is often in a non-saturated state under rainfall and reservoir water level fluctuation. Constructing a creep model of unsaturated soil in consideration of the matric suction is of vital significance. In this research, a creep model of unsaturated soil for a landslide in the Three Gorges Reservoir area is built based on Burger’s model and assumptions of the mechanics of unsaturated soil. In subsequence, the model parameters were solved using nonlinear regression algorithm, and the model’s rationality was verified by comparing predicted values with experimental values. Finally, in the light of the linear correlation between model parameters and net confining pressure, the model was further modified and the validity of the modified model was verified. The constructed creep model of unsaturated soil well reflects the unsaturated creep behavior of soil in the sliding zone of the landslide, thus is of great significance in predicting the long-term deformation of the landslide.更多还原