中国铁道科学2018，Vol.39Issue(3)：1-7,7.DOI:10.3969/j.issn.1001-4632.2018.03.01
兰新高铁粗颗粒土填料冻胀性试验研究
Experimental Study on Frost Heaving of Coarse-Grained Filling Material for Lanzhou-Xinjiang High Speed Railway
摘要
Abstract
In allusion to the prevention and control of the frost damage for the subgrade of Lanzhou-Xinjiang high speed railway,the frost heaving of coarse-grained filling material was studied through frost heaving tests in both closed and open systems for subgrade filling materials from four gravel-soil-taken fields with different fine particle contents and water contents.Results show that frost heaving may occur in coarse-grained filling material containing fine particles at the time of freezing,and the frost heaving ratio depends on the content of fine particles,water content before freezing and water supply during freezing.In closed system,the frost heaving ratio increases with water content and fine particle content.When the fine particle content is 3.76 ％～21.46％,the frost heaving ratio of saturated filling can reach 1.1 ％～2.2％.In winter,the frost heaving produced during freezing will exceed the vertical deviation management value of the ballastless track for high speed railway,which will result in frost damage to subgrade.The frost heaving ratio of filling in open system is far greater than that in closed system,and it can reach 3.45％～4.7％ when the compacting factor is 0.93.Obviously,the first choice of measures for the subgrade frost damage treatment of high speed railway is controlling fine particle content and well designing waterproof and drainage facilities.关键词
兰新高铁/粗颗粒土填料/冻胀/细颗粒含量/含水率/封闭系统/开放系统Key words
Lanzhou-Xinjiang high speed railway/Coarse-grained filling material/Frost heaving/Fine particle content/Water content/Closed system/Open system分类
交通工程引用本文复制引用
杨有海,沈鑫,朱生宪,高以健..兰新高铁粗颗粒土填料冻胀性试验研究[J].中国铁道科学,2018,39(3):1-7,7.基金项目
中国铁路总公司科技研究开发计划项目(2016G003-F) （2016G003-F）
