重塑黏土临界状态线随初始含水率的变化规律

针对具有不同初始含水率的两种饱和重塑黏土进行了一系列的三轴固结不排水剪切试验，探讨初始含水率对黏土临界状态的影响，得到了不同初始含水率重塑土的应力-应变关系和有效应力路径。根据应力-应变关系曲线发现不同初始含水率重塑土均存在临界状态应力比。基于临界状态土力学理论研究了在p´-q平面和v-lnp´平面内临界状态线随初始含水率的变化规律，并分析了初始含水率对临界状态参数的影响。

Change of critical state lines of reconstituted clays with initial water contents

A series of isotropically consolidated undrained triaxial compression shear tests are performed on two kinds of reconstituted clays with different initial water contents to investigate the effect of the initial water content on the critical states. It is found that the stress-strain curves and the effective stress paths of the reconstituted clays are significantly affected by the initial water content. There exists the critical stress ratio for a given clay at the given initial water content which is not dependent on the confining stress. More importantly, within the theoretical critical state framework, the critical state line is not unique for the given reconstituted clay with an intrinsic nature. The change of the critical state lines with initial water content is discussed in p´-q plane and v-ln p´ plane, respectively. The variation of the critical state parameters with the initial water content is analyzed.