粉土作为路基填筑材料的工程特性研究  

The study on the engineering characteristics of silty soil as a subgrade filling material

作　　者：张万涛 吕治刚 王昊 Zhang Wantao;Lv Zhigang;Wang Hao(Anhui Traffic Survey&Design Institute Co.,Hefei 230011,China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]安徽省交通勘察设计院有限公司,安徽合肥230011 [2]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《山西建筑》2019年第22期1-2,共2页Shanxi Architecture

摘　　要：粉土属于工程性质不良土体,作为路基填料时需要对其强度特性进行评价。以皖北地区的道路工程为例,对不同采样点的粉土进行CBR(加州承载比)试验,研究了粉土中黏粒含量对粉土承载力的影响。结果表明,粉土的CBR值随黏粒含量的升高而减小,并且在黏粒组分中,对CBR值影响较大的是细黏粒(粒径<0. 002 mm部分)。向粉土中掺入2%的石灰对其进行改良,CBR值显著提高,完全能满足规范要求,可应用于实际工程。The strength characteristics of the subgrade with silty soil need to be evaluated because of its poor engineering properties. Based on road construction in northern Anhui province,CBR(California Bearing Ratio) of some silty soils from different sampling sites were tested and the effect of clay content on the bear capacity of the silt ground was studied. The results show that the CBR values of silty soil decreases with clay content increasing. And in clay component,the soil particles with finer grain diameter(< 0. 002 mm) have a greater influence on CBR values of silty soil. To improve the propertis of the subgrade,the lime was mixed with the silty soil specimens. The CBR values are significantly improved,which can meet the requirements of specifications and can be applied to practical engineering.

关 键 词：粉土 黏粒物质 CBR试验 掺灰试验 

分 类 号：TU411[建筑科学—岩土工程]