一种预估非饱和土渗透系数的方法

摘要

Based on the thermodynamic mixture theory model which can consider the mechanical interaction occurring on the interface between two components in unsaturated soils and is proposed by Wei and Muraleetharan, the method that can predict the hydraulic function, by transient multi--step outflow experiment under a given series of metric suction, is built. Throughout the multi--step outflow experiment, it is seen that, for the low liquid limit silt and clay, the predicted value of hydraulic conductivity under the given metric sunetion, which are calculated from outflow datum of the multi--step outflow experiment, are very closed to the measured value of that which are measured by the combined laboratory system.%基于Wei＆Muraleetharan的多孔介质热动力学混合物理论模型的基础，并结合一定变化规律的基质吸力序列，建立了给定基质吸力序列作用下利用多步流动试验瞬态溢出量数据确定非饱和土渗透系数的方法。通过对低液限粉土、低液限黏土的多步流动试验研究发现，利用瞬态溢出量数据的拟合来确定非饱和土渗透系数的方法得到的各基质吸力作用下试样渗透系数的预估值，与联合测试系统测得的各基质吸力作用下试样的渗透系数接近。