粘性土剪切变形中渗透性试验研究及数学模型

Experimental Study and Mathematical Model on Permeability of Clayey Soil with Shear Deformation

摘要: 本文研制了一种新型的渗流试验设备，用以测定土体在发生剪切变形过程中不同物理力学状态条件下的渗透系数，针对某种粘性土进行了一系列试验，结果表明粘性土剪切变形过程中的渗透系数受到多种因素的影响，其中剪切应变和围压的影响最为显著。在此基础上提出了一个可反映土体物理状态变化及剪切中结构变化对其渗透性影响的数学模型，通过试验数据拟合验证，结果表明该模型可有效反映土体剪切变形过程中不同物理力学状态条件下的渗透系数。 A new seepage device was developed to measure permeability of clayey soil under different physical and mechanical status with shearing deformations. A series of seepage tests were carried out on a certain clayey soil and indicated that permeability of the soil was related with many factors, among which the shearing strain and confining pressure were the most important. Based on the testing results and mechanism analysis, a new relation model of permeability to reflect effect of physical and mechanical status was raised. The model was then fitted and checked by the testing results.