低液限粉土水理特性试验研究  

Research on the Water-Physical Property of the Low Liquid Limit Silt

作　　者：刘伟超[1] 杨广庆[1] 熊保林[1] 汤劲松[1] 罗会[1,2] 

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]保定市保通公路勘察设计有限责任公司,河北保定071000

出　　处：《地下空间与工程学报》2015年第4期926-932,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(51178280;51108283);河北省交通运输厅科技计划项目(Y-2011001)

摘　　要：土体的水理性质会直接对其强度和性状产生重要影响,在实际工程中,也会影响到建筑物、路堤和边坡的稳定性。通过渗透试验、湿化试验和毛细管水上升高度试验,对低液限粉土的透水性、毛细管性、崩解性等水理特性进行了研究。结果表明:对于低液限粉土,当含水率相同时,随着压实度的增大渗透系数减小,其湿化崩解速度减慢;当压实度一定时,压实粉土的渗透系数与含水率呈非线性关系,随着含水率的增大而减小,在最优含水率下,其湿化崩解速度最慢。压实的低液限粉土毛细水会随时间增加而逐渐升高,且其升高速度前期较大,中后期较小。Water-physical property of soil affects its strength and performance. In practice,the Water-physical property also affects the stability of building,embankment and slope. In order to evaluate the water permeability,capillary,disintegration of low liquid limit silt,the water-physical property of the chosen low liquid limit silt is discussed through penetration test,humidifying test and capillary raising height test. Test results show that for low liquid limit silt,in the same water content,the infiltration coefficient reduces with increasing compaction degree and the humidifying disintegration speed slows down. Under the same compaction degree,the infiltration coefficient of compacted silt has nonlinear relationship with water content and reduces with increasing water content. In the optimal water content,the humidifying disintegration speed of low liquid limit silt is the slowest. Capillary raising height of the compacted low liquid limit silt increases with time. At the preliminary stage the capillary raising speed is fast and at the middle and late stage,the capillary raising speed is slow.

关 键 词：渗透系数 湿化试验 崩解性 毛细管性 压实度 

分 类 号：TU47[建筑科学—结构工程]