结构性对黏性土渗透性状的影响研究

利用改进的固结渗透仪,通过对天然沉积软黏土原状样及重塑样进行固结渗透试验,对比分析了压缩过程中天然沉积土原状样与重塑样在同一孔隙比和同一应力水平下的渗透性状。研究结果表明,天然沉积土原状样e-log kv曲线位于重塑样的右边,但是两者差别不大;原状样的log kv-logσ’v关系曲线位于重塑样的上方,天然沉积土原状样与重塑样同一应力水平下的渗透系数的比值随着应力水平的增大而先增大后减小,在原状样固结屈服压力时达到最大值。

Effect of soil structure on the hydraulic conductivity behaviour of clays

To investigate the various hydraulic conductivity behaviours under the same void ratio or stress level,a series of falling head hydraulic conductivity tests were performed.Both undisturbed and remoulded specimens of three clays from Wenzhou consolidated at different stress levels were tested by a modified oedometer.It is found that the hydraulic conductivity of the undisturbed specimen is almost identical to that of the remoulded specimen under the same void ratio.It is indicated that the curves of hydraulic conductivity versus effective vertical stress of the undisturbed specimens lie above those of the remoulded specimens.The ratio of the undisturbed specimen’s hydraulic conductivity to the remoulded specimen’s hydraulic conductivity increases with the increase of stress.When the consolidation pressure equals to yield stress,the ratio reaches the maximum and then drops down.