论文部分内容阅读
渗析法是一种测量非饱和土基质吸力的重要方法,而测量结果是否准确,控制渗析的时间非常重要。基于有限元数值分析软件SEEP/W,建立渗析法的数值模型,分析渗析的试验过程,研究溶液吸力、土样水力参数、初始重力含水率、初始干密度以及土样大小等因素对吸湿条件下非饱和黏土渗析平衡时间的影响。结果表明,随着渗析时间的增加,土样与溶液之间的吸力差逐渐变小,渗析过程变慢;试验用土样不宜过大,对于较小土样,多数条件下土样的渗析平衡时间约为1.5~8.0 d;当溶液吸力较大或土体饱和渗透系数较小时,渗析平衡时间大大增加;渗析平衡时间随土-水特征参数a、n、饱和渗透系数、初始含水率及干密度的增大而减小,随饱和体积含水率的增加而增加。
Dialysis is an important method to measure the suction of unsaturated soils. It is very important to measure the dialysis time accurately. Based on SEEP / W software, the numerical model of the dialysis method is established. The experimental process of the dialysis is analyzed. The influences of the solution suction, the hydraulic parameters of the soil sample, the initial gravity water content, the initial dry density and the soil sample size on the hygroscopic conditions The Influence of Unsaturated Clay Dialysis Balance Time. The results showed that with the increase of dialysis time, the difference of suction between soil sample and solution became smaller and the dialysis process became slower. The test soil sample should not be too large. For smaller soil samples, the dialysis equilibrium of soil samples under most conditions Time is about 1.5 ~ 8.0 d. When the solution suction is larger or the soil saturated permeability coefficient is smaller, the dialysis equilibrium time greatly increases. The dialysis equilibrium time varies with soil-water characteristic parameters a, n, saturation permeability coefficient, initial water content and dry The density increases and decreases, with the increase of saturated volumetric moisture content increases.