非饱和滑带土非线性Burgers蠕变模型

基于非线性流变力学理论,建立了非饱和滑带土非线性Burgers蠕变模型。模型中不仅考虑滑带土非饱和特性-基质吸力对土蠕变特性的影响,同时考虑了与时间、应力状态有关的非线性黏滞体的流变特性,由非线性黏滞体替换Burgers模型中的线性黏滞体。对非饱和滑带土开展三轴蠕变试验,并对试验结果采用最小二乘法曲线拟合,获得了不同基质吸力下的蠕变参数,并将试验结果与Burgers模型拟合曲线以及提出的非线性Burgers模型拟合曲线进行对比。结果表明,采用非线性Burgers模型能很好地拟合试验结果,且与试验曲线的吻合程度、相关系数明显高于线性Burgers模型。

Nonlinear Burgers Creep Model for Unsaturated Soil in Slipping Zone

Based on nonlinear rheological-mechanical theory,a nonlinear Burgers creep model for unsaturated soil in slipping zone was established.In the creep model,the effect of matric suction on the creep behavior of soil,a characteristic of unsaturated soil in slipping zone,was considered,at the same time,the rheological characteristics of nonlinear viscous body related to time and the stress state were also considered,the nonlinear viscous body replaced the linear viscous body in the Burgers creep model.Triaxial creep test for the unsaturated soil in slipping zone was conducted,the experimental results were fitted by the curve of least squares method,and the creep parameters of different matric suction were obtained.At last,the experimental results were compared with the fitting curve of Burgers creep model and the fitting curve of nonlinear Burgers creep model.The comparison results show nonlinear Burgers creep model can better fit the experimental results,for the experimental curves,the coincidence level and correlation coefficient of the fitting curve is obviously higher than those of linear Burgers creep model.