摘要
为研究水对豫东黄泛区粉砂土性能的影响,进行了击实试验、无侧限抗压强度试验、冻融试验、直接剪切试验、毛细水上升及控制试验.结果表明:粉砂土最大干密度为1.84g/cm3,最佳含水率为11.5%;随着含水率的增加,无侧限抗压强度呈下降趋势;粉砂土的黏聚力随含水率的变化而变化,在含水率达到11.4%之前,黏聚力随含水率增大而增大,之后黏聚力随含水率增大而减少;在含水率达到14.1%之前,内摩擦角变化不大,之后内摩擦角迅速减小;经过16d的观测,在120cm高度内粉砂土处于潮湿或过潮湿状态.总之,粉砂土中毛细水上升高度较大,毛细水引起土的含水率增加,导致路用性能降低.
To study the effect of water on silty soil in eastern Henan section formerly flooded by the Yellow river,the compaction test,unconfined compressive strength test,freeze-thaw test,direct shear test and capillary water rising and its controlling tests were put forward.The results show that the maximum dry density of silty soil is1.84g/cm3,and the optimum moisture content is 11.5%.With the increasing of moisture content,the unconfined compressive strength drops down.The cohesive force of silty soil varies with the change of moisture content.Before the moisture content 11.4%,the cohesive force increases with moisture content increasing.Then,the cohesive force decreases with the increasing of moisture content.Before the moisture content of 14.1%,the internal friction angle changes little;then,the angle of internal friction decreases rapidly.For 16 days observations,it is found that the subgrade soil is moist or over humid within 120 cm in height.To sum up,the capillary water rises high in the silty soil,which leads to the increase of moisture content and the decrease of road performance.
出处
《河南大学学报（自然科学版）》
CAS
2015年第2期235-238,共4页
Journal of Henan University:Natural Science
基金
河南省教育厅自然科学研究计划项目(2011A580001)
河南省交通运输厅科技项目(2010PII10)
关键词
道路工程
路基工程
粉砂土
黄泛区
毛细水
路基稳定性
road engineering
subgrade engineering
silty soil
area formerly flooded by the Yellow river
capillary water
subgrade stability
