The hydraulic conductivity k, one of the most important engineering properties of soft clay, plays a great role during the whole life cycle of underwater tunnel. Therefore, it is necessary to systematically study the responses of k to the dynamic load under the background of the great development of geotechnical engineering in the world. In this study, a series of seepage tests after cyclic loading were conducted on reconstituted kaolin clay using a modified hollow cylinder apparatus. The influence of cyclic load on the permeability characteristics of soft clay was illustrated in two aspects. The cumulative axial deformation of clay induced by cyclic loading resulted in the smaller hydraulic conductivity of the specimens, and also, the dynamic load reconstructed the microstructure of clay and made the number of large pores getting decreased and the small pores increased. There was a positive correlation between the deformation of soil and the change of hydraulic conductivity, but the reconstruction effect was irregular with the frequency of dynamic load. The measured k values got affected at the beginning, this phenomenon appropriately explains the positive correlation between the number of cycles of dynamic load and the change of hydraulic conductivity.

导水率k是软黏土最重要的工程性质之一，在水下隧道的整个生命周期中发挥着重要作用。因此，有必要系统地研究k的响应。在世界岩土工程巨大发展的背景下承受动载荷。在这项研究中，使用改进的空心圆柱体设备在再生高岭土上进行了循环荷载后的一系列渗透测试。从两个方面阐述了循环荷载对软黏土渗透特性的影响。循环荷载作用引起的黏土累积轴向变形导致试件的水力传导率减小，动荷载也使黏土的微观结构得以重建，大孔隙的数量减少而小孔隙的数量增加。土壤变形与水力传导率的变化呈正相关，但随着动荷载频率的增加，其重建效果是不规则的。实测k值从一开始就受到影响，这种现象适当地解释了动态载荷循环次数与水力传导率变化之间的正相关关系。