摘要
针对我国公路路基填土压实特性,采用室内击实试验,绘制了不同击实功作用下和不同级配粉土、黏土的干密度曲线,探讨了不同级配的粉土、黏土的压实性能,确定了不同击实功下压实度与孔隙比、空气体积分数、饱和度之间的关系;并基于微观结构分析,探讨了压实度对填土颗粒微观结构的影响.试验结果表明:不同级配的粉土、黏土中存在一个最佳击实功,并且在该击实功下,可获得最大干密度;黏土可以通过掺入粗颗粒改变其压实特性,而对于粉土,通过掺入粗颗粒改变级配并不能有效地改变其压实特性;在压实过程中,随着压实度的增加,黏土颗粒可以较充分地填充孔隙,而粉土进一步填充孔隙的效果相对较差.
According to the compaction features of filled-in ground in highroad,dry weight density curve was obtained through the indoor compaction test under the work of resistance function and the different gradation silty soil or the clay.The compaction features were presented under different graduations of silt soil or clay soil.The relationship between the compactness,the void ratio,the air volume rate,and the degree of saturation was obtained.Furthermore,based on the microscopic structure analysis,the influence of compactness on the earth fill microscopic structure was discussed.The test results indicate that in the different gradations of silty soil or the clay,there is one optimum compaction work.The maximum dry density is obtained under the optimum compaction work.The compression feature of clay can be changed by mixing the coarse particles,but that of silty soil can not be changed effectively.In the compaction process,with the increase of compactness,the clay grains can fill the pore spaces fully,but the silty soil can not.
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2011年第1期107-110,共4页
Journal of Jiangsu University：Natural Science Edition
基金
中国博士后科学基金资助项目(20090451329)
关键词
粉土
黏土
路基
压实特性
击实试验
微观结构分析
silt soil
clay soil
roadbed
compaction property
compaction test
microscopic structure analysis
foundation
