长期循环荷载作用下饱和软粘土应变速率的研究

为了加深对长期循环荷载作用下饱和黏土变形性状的认识，对珠江三角洲的典型淤泥质饱和软黏土进行了室内循环三轴试验，着重研究了饱和黏土的残余应变速率。通过试验结果分析可得：（1）在长期循环荷载作用下,黏土的应变速率随时间的增大而减小,应变速率对数与时间对数间的关系可用直线描述；（2）初始静偏应力与动偏应力的耦合作用以及不同的排水条件对黏土残余应变速率有较大程度的影响。这些结论可为长期循环荷载作用下饱和黏土变形机理的进一步研究提供理论基础。

Study on Strain Rate of Soft Clay Under Long-term Cycle loading

In order to study the deformation behavior of soft clay, a series of undrained and drained cyclic triaxial tests were performed on typical Pearl River Delta soft clay. The study is focused on the rate of residual strain. Some conclusions can be obtained from the analysis of test results: (1) Under long-term cycle loading, the strain rate of soft clay decreases with time. The logarithmic relationship between strain rate and time is linear. (2) The effect of initial static deviator stress and cyclic shear stress coupling and the drained condition have much influence on stain rate of residual strain. These conclusions are of significance for studying the deformation mechanism of soft clay under long-term cycle loading.