黏土大剪切变形中的渗透特性试验研究

利用改进的三轴渗透试验装置对某高堆石坝心墙黏土进行了一系列剪切过程中的渗透试验，揭示了黏性土发生大剪切变形过程中其渗透系数随轴向应变的变化规律，并分别对围压、渗透压力、渗透方向等因素对土体渗透性的影响进行了探讨。研究结果表明，黏性土大剪切变形过程中其渗透性变化规律一般表现为：在剪切变形起始阶段，渗透系数迅速减小，随着轴向应变的增加，其变化越来越缓慢，最后基本上趋于稳定。轴向应变、围压、渗透压力等是影响渗透系数的主要因素。

Experimental study of permeability of clayey soil during process of large shear deformation

By using improved triaxial seepage test equipment, a series of seepage tests during shear deformation were performed on clay samples. The permeable behavior of clayey soil during the process of large shear deformation was investigated; and the effects of confining pressure, seepage pressure and seepage directions were discussed. It is shown that the permeability of clayey soil reduced rapidly in initial shear process, and then it changed more and more slowly with increasing axial strain, finally it tended to steady. The permeability is mainly affected by axial strain, confining pressure and seepage pressure.