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通过对温州典型饱和软黏土进行一系列不同应力路径下的部分排水循环动三轴试验,研究了部分排水条件下循环围压对饱和软黏土变形特性的影响。试验结果表明:部分排水条件下,与常规的围压保持恒定,偏应力单独循环作用下的三轴试验结果相比,循环围压的存在对饱和软黏土的永久体应变和永久轴向应变均产生了的显著的影响。在相同循环应力比和循环次数下,试样的永久体应变和永久轴向应变均随着循环围压幅值的增大而增大,说明常规的恒定围压循环三轴试验会低估高速交通荷载作用下路基土体的沉降。基于试样第10 000圈的永久体应变和永久轴向应变,分别建立了可以量化部分排水条件下循环围压对饱和软黏土永久体应变和永久轴向应变影响的经验公式,并用于预测饱和软黏土在交通荷载这种包含循环偏应力和循环围压耦合作用的复杂应力条件下产生的永久变形。
A series of dynamic displacement triaxial tests under different stress paths were carried out on a typical saturated soft clay in Wenzhou to study the effect of confining pressure on the deformation characteristics of saturated soft clay under partial drainage conditions. The experimental results show that under the partial drainage conditions, compared with the triaxial test under constant cyclic confining pressure and partial cyclic stress, the cyclic strain has the same effect on permanent body strain and permanent axial strain of saturated soft clay Has had a significant impact. At the same cyclic stress ratio and the number of cycles, the permanent body strain and permanent axial strain of the specimens increase with the increase of the cyclic confining pressure, which shows that the conventional constant confining pressure cyclic triaxial test will underestimate the high-speed traffic Subgrade settlement under load. Based on the permanent body strain and the permanent axial strain at the 10 000th circle of the specimen, empirical formulas were established for quantifying the influence of cyclic confining pressure on the permanent body strain and permanent axial strain of saturated soft clay under partial drainage conditions, respectively, and used to predict the saturation Soft clay in the traffic load, which contains cyclic stress and cyclic confining pressure coupling complex stress conditions resulting in permanent deformation.