高地下水位条件下花岗岩残积土路堤的毛细特性研究  

Research on capillary characteristics of granite residual soil embankment with the shallow water table

作　　者：阙云[1] 姚晓琴[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2011年第5期754-759,共6页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50908056);福建省自然科学基金资助项目(2009J051212009J01249);福建省教育厅科研资助项目(JA08016)

摘　　要：为了解高地下水位条件下花岗岩残积土低路堤的毛细特性,以福建省典型花岗岩残积土为例,采用自制的毛细水上升试验系统进行不同压实度和初始含水量条件下的毛细水上升试验,结合数值模拟研究毛细水上升规律.结果表明:典型花岗岩残积土路堤土的毛细水初期上升高度及速度服从对数函数或幂函数模型,达到平衡湿度的时间约5 a,其最终上升高度约3.28 m;毛细水初期上升高度及速度随压实度的增大而减小,而最终上升高度则呈现相反趋势;毛细水初期上升高度随初始含水量的增大而减小,并在最佳含水量附近时最终上升高度最大.建议路基压实时含水量为最佳含水量湿侧2%,有利于降低路堤上部的土体受毛细水的影响程度.In order to investigate of the capillary characteristics of granite residual soil embankment with the shallow water table,taking the typical granite residual soil of Fujian Province as an example,based on self-made capillary water rising test system is conducted the capillary water rising test with different compaction degree and initial moisture content conditions,and combined with the numerical simulation is researched the capillary water rising law.The result indicates that initial rising height and velocity of capillary water of granite residual soil embankment obey the logarithmic function or power function models.It takes five years reach the equilibrium humidity and the ultimate rising height is 3.28 m approximately.The initial rising height and velocity of capillary water decrease with the increase of compaction degree,meanwhile the ultimate rising height shows the opposite trend.The initial rising height and velocity of capillary water decrease with the increase of the initial moisture content and reach the maximum height near optimum moisture ultimately.In order to reduce the effect by capillary water to the upper part of subgrade,it is reasonable to compact at 2% moisture wetter than optimum moisture.

关 键 词：花岗岩残积土 毛细水 水位 压实度 含水量 平衡湿度 

分 类 号：TU45[建筑科学—岩土工程]