摘要
以某新建重载铁路项目风积沙路基工程为依托,通过筛分试验、Z1重型标准击实试验、路基工艺试验等方法,研究分析了风积沙的物理性质和压实机理,确定了相关施工工艺参数以指导施工。研究结果表明:该区域的风积沙为级配不良的中细砂,可作为C组料用于路基基床以下部分的填筑;击实曲线呈双驼峰状,最佳含水率为12%,最大干密度为1.760 g/cm3;最佳含水率状态下的松铺厚度取40 cm较为合理,可同时满足技术指标和经济性要求;风积沙路基振动碾压效果不佳,采用装载机碾压5遍和压路机静压1遍收面的组合碾压方式,压实效果较为理想,地基系数K30可达102.4 MPa/m,可满足相关规定。
This paper is based on the aeolian sand subgrade project of a newly built heavy load railway project,the physical properties and compaction mechanism of aeolian sand are studied and analyzed by means of screening test,Z1 heavy-duty standard compaction test and subgrade process test,and the relevant construction parameters are determined to guide the construction. The results show that the aeolian sand in this area is medium and fine sand with poor gradation,and it can be used as C-aggregate for filling the part below the subgrade bed.The compaction curve is a double hump curve,the optimum moisture content is 12%,and the maximum dry density is 1.760 g/cm3. The thickness of loose pavement under the optimum moisture content is reasonably selected as 40 cm,which can meet both the technical and economic requirements simultaneously. The vibration compaction effect of aeolian sand roadbed is not good. It is advisable to adopt the combined rolling method for rolling 5 times with the load and for static pressing 1 time with road roller. The foundation coefficient K30 can reach 102.4 MPa/m,which meets the requirements of relevant standards and norms.
作者
赵建刚
陈俊涛
吴文杰
Zhao Jiangang;Chen Juntao;Wu Wenjie(Gansu Tieke Construction Engineering Consulting Co.,Ltd.,Lanzhou 730000;Shanxi Jingshen Railway Co.,Ltd.,Yulin 719000,Shanxi)
出处
《工程建设》
2019年第12期35-38,共4页
Engineering Construction
关键词
重载铁路
风积沙路基
压实机理
试验研究
含水率
颗粒级配
heavy-load railway
aeolian sand roadbed
compaction mechanism
experimental study
moisture content
particle size distribution
