确定渗析平衡时间的数值模拟方法
发布时间：2018-07-23 13:52
【摘要】：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。
[Abstract]:Dialysis method is an important method to measure the suction of unsaturated soil matrix, and whether the measurement result is accurate or not, the time of controlling dialysis is very important. Based on the finite element numerical analysis software SEEP / W, the numerical model of the dialysis method is established, the experimental process of the dialysis is analyzed, and the solution suction, the hydraulic parameters of the soil sample, the initial gravity moisture content are studied. Effects of initial dry density and soil sample size on the dialysis equilibrium time of unsaturated clay under hygroscopic conditions. The results show that with the increase of dialysis time, the suction difference between the soil sample and the solution becomes smaller, and the dialysis process becomes slower, and the test soil sample should not be too large, for the smaller soil sample, Under most conditions, the exudation equilibrium time of soil sample is about 1.5 ~ 8.0 days, when the solution suction is large or the saturated permeability coefficient of soil is small, the dialysis equilibrium time increases greatly, and the saturated permeability coefficient increases with the characteristic parameter of soil-water. The initial moisture content and dry density decrease and increase with the increase of saturated volume water content.
【作者单位】： 合肥工业大学资源与环境工程学院;山西省建筑设计研究院;
【基金】：国家自然科学基金项目面上项目(No.41572282,No.41372281,No.41172273)~~
【分类号】：TU43
，
本文编号：2139617
[Abstract]:Dialysis method is an important method to measure the suction of unsaturated soil matrix, and whether the measurement result is accurate or not, the time of controlling dialysis is very important. Based on the finite element numerical analysis software SEEP / W, the numerical model of the dialysis method is established, the experimental process of the dialysis is analyzed, and the solution suction, the hydraulic parameters of the soil sample, the initial gravity moisture content are studied. Effects of initial dry density and soil sample size on the dialysis equilibrium time of unsaturated clay under hygroscopic conditions. The results show that with the increase of dialysis time, the suction difference between the soil sample and the solution becomes smaller, and the dialysis process becomes slower, and the test soil sample should not be too large, for the smaller soil sample, Under most conditions, the exudation equilibrium time of soil sample is about 1.5 ~ 8.0 days, when the solution suction is large or the saturated permeability coefficient of soil is small, the dialysis equilibrium time increases greatly, and the saturated permeability coefficient increases with the characteristic parameter of soil-water. The initial moisture content and dry density decrease and increase with the increase of saturated volume water content.
【作者单位】： 合肥工业大学资源与环境工程学院;山西省建筑设计研究院;
【基金】：国家自然科学基金项目面上项目(No.41572282,No.41372281,No.41172273)~~
【分类号】：TU43
，
本文编号：2139617
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2139617.html
