季节性冻土区路基基床粗颗粒土填料冻胀特性研究  

Study on frost-heave performances of filling material consisted of coarse grained soils for subgrade bed in seasonal frozen region

作　　者：赵洪勇[1,2] 闫宏业[1,2] 张千里[1,2] 程远水[1,2] 

机构地区：[1]中国铁道科学研究院铁道建筑研究所,北京100081 [2]高速铁路轨道技术国家重点实验室,北京100081

出　　处：《铁道建筑》2014年第7期92-94,共3页Railway Engineering

摘　　要：季节性冻土区高速铁路路基冻胀病害日渐突出,路基冻胀对施工的影响也不容忽视,研究路基基床填料的冻胀特性对路基冻胀防治具有实际意义。选取东北某客运专线路基基床底层A、B组填料作为试验土样,通过不同含水率、不同细粒含量、不同冻结温度条件下的冻胀试验,研究各参数对冻胀率的影响。试验结果表明:该填料冻胀率随着含水率的增加而增大,细粒含量<15%的粗颗粒土仍会发生冻胀;该填料冻胀率随着细粒含量的增加而增大;填料冻结温度直接影响该填料的冻结过程,进而对其冻胀率产生影响。The frost-heave defects pose an increasingly severe challenge to the high-speed railway in seasonally frozen soil areas,affecting both the train operation and the subgrade construction. It is meaningful to study the frost-heave performance of the subgrade-bed filling and provide effective treatment measures. The bottom-layer fillings of certain passenger-dedicated railway subgrade were chosen and labeled respectively as Filling A and Filling B. A parametric analysis was conducted with experimental tests. Various factors,including the moisture content,the proportion of fine grain and temperature,affected the frost-heave ratio. The results indicated that the frost-heave ratio increased with the moisture content. Such defect occurred when the fine-grained content of the coarse-grained soil stayed below 15%. Moreover,the frost-heave ratio increased with the fine-grained content. In addition,the experiment revealed that the freezing temperature of the filling directly affected the freezing process, further influencing the frost-heave ratio.

关 键 词：季节性冻土 路基基床填料 冻胀 

分 类 号：U213.14[交通运输工程—道路与铁道工程]