压实红黏土水分传输的毛细效应与数值模拟  

Capillary effect of moisture transfer and its numerical simulation of compacted laterite soil

作　　者：谈云志[1,2] 孔令伟[2] 郭爱国[2] 万智[3] 

机构地区：[1]三峡大学土木与建筑学院三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [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]湖南省交通科学研究院,长沙410015

出　　处：《岩土力学》2010年第7期2289-2294,共6页Rock and Soil Mechanics

基　　金：交通部西部交通建设科技项目(No.200631878530);中国科学院知识创新工程重要方向项目(No.kzcx2-yw-150);岩土力学与工程国家重点实验室重点项目(No.SKLZ0803)

摘　　要：当路基处于地下水水源丰富且水位较高的区域时,容易受到地下水的毛细上升侵蚀作用。为治理因水分毛细上升而引起的路基病害,需了解其毛细上升规律。在水平吸渗试验原理的基础上略加改进,自制了一套毛细上升试验装置,进行了三种不同初始干密度试样的试验。结果表明,毛细上升高度与含水率的关系类似于土-水特征曲线;试样的干密度越大,在相同的时间内毛细上升高度越小;水分因毛细效应的扩散能力随初始含水率的变化存在一个最优含水率点。最后,利用有限元方法模拟了水分在不同时刻沿着试样高度的分布规律,并对比分析了试验终了时刻的计算值与实测值,二者之间的分布规律比较一致。When subgrade lies in areas which have abundant groundwater and high water level, it was vulnerable to erosion. For treatment subgrade diseases caused by water capillary rise, it is needed to acquire the law of capillary rise in the soil. Based on improving the horizontal absorption test, a set of capillary rise test apparatus has been made to conduct three groups of initial dry density specimen experiment. The results show that the relationship between capillary rise height and water content similar to the soil water characteristic curve; with the dry density of specimen increasing, the capillary rise height became smaller within the same time interval; there was an optimum moisture content during the diffuse capacity changed with the initial water content. Finally, The distribution regularity of moisture distribution along with the height of samples is simulated with FEM. comparing the calculated results with the measured field data, it is proved that the calculated results can be fitted well with the measured field data.

关 键 词：红黏土 路基 压实 水分传输 毛细效应 

分 类 号：O241[理学—计算数学]