利用溢出量数据确定非饱和土-水力学参数  

Determining hydraulic parameters of unsaturated soils by transient multi-step outflow experiment

作　　者：陈辉[1] 韦昌富[2] 胡国辉 

机构地区：[1]江西科技学院土木工程学院,南昌330098 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [3]江西工商职业技术学院,南昌330200

出　　处：《岩土力学》2013年第2期347-352,共6页Rock and Soil Mechanics

基　　金：国家自然基金项目(No.10872211);国家自然基金项目(No.11072255);江西科技学院自然科学基金项目(No.XYKY11102);江西省科技计划项目(No.20123BBG70180)

摘　　要：在Wei&Muraleetharan基于非饱和土两相流交界面上的动态相容条件提出的多孔介质热动力学混合物理论模型基础上,推导出能描述溢出量与时间关系的溢出量演化方程。根据溢出量演化方程,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-水力学参数的方法。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-水力学参数的方法而得到的各基质吸力作用下试样饱和度和渗透系数预估值,与联合测试系统测得的各基质吸力作用下试样的饱和度及渗透系数接近。Based on the thermodynamic mixture theory model which can consider the mechanical interaction occurring on the interface between two components in unsaturated soils is proposed by Wei and Muraleetharan,an evolution equation of outflow in an unsaturated sample is developed.The equation describes well the variation of outflow with time in a multi-step outflow experiment.According to the evolution equation,the method that can predict hydraulic parameters of unsaturated soils,including the soil-water characteristic curve and the hydraulic function,by transient multi-step outflow experiment under a given series of matric suction,is built.Through the multi-step outflow experiment,it is seen that,for the low liquid limit silt and clay,the predicted values of saturation and hydraulic conductivity under the given matric sunction which are calculated from outflow data of the multi-step outflow experiment,are very close to the measured values of that measured by the combined laboratory system.

关 键 词：多步流动试验 溢出量数据 水力学参数 

分 类 号：TU43[建筑科学—岩土工程]