不同含泥量与含水率下铁路板结道床的冻胀特性  

Frost Heaving Behaviors of Hardened Ballast Beds under Different Content of Clay and Water

作　　者：赵成江 王晓荣 夏琼[2] 金增芳 

机构地区：[1]中铁西北科学研究院有限公司,兰州730000 [2]兰州交通大学,兰州730070

出　　处：《铁道工程学报》2011年第9期36-39,96,共5页Journal of Railway Engineering Society

基　　金：铁道部科技研究开发计划(2008G014)

摘　　要：研究目的:洁净的道床不产生冻胀,但如果道床中混入粉黏土颗粒大于12%～15%时也能产生冻胀。本文通过室内板结道床道砟中粉黏粒含量的测试,以及对不同含泥量、不同含水率下室内冻胀试验的分析,找出板结道床的冻胀特征。研究结论:通过室内板结道床道砟中粉黏粒含量的测试,以及不同含泥量、不同含水率下室内冻胀试验分析,指出了道砟中由于粉黏粒含量超标引起的冻胀率一般小于4%,道床冻胀是道砟含泥量和道床内含水率共同作用的结果,在做好防排水的同时还要注意到含泥量对道床冻胀的影响,道床的弱冻胀性对铁路线性工程措施危害性大于普通建筑物,应引起足够的重视。Research purposes： The frost heaving is not generated in clean ballast bed. It will be frost heaving if the ballast bed mixed with more than 12% to 15% silt clay particles. In this paper, by testing the silt content in interior hardened ballast and analyzing for frost heaving tests with different clay and water content, the frost heaving features of interior hardened ballast are found.Research conclusions：By testing the silt content in interior hardened ballast and analyzing for frost heaving tests with different clay and water content, it states that the frost heaving rate is generally less than 4% when the silt content in ballast exceeds standard, and the frost heaving of ballast is the result of a combination of silt content and water content, so proof and drainage system must be good meanwhile effect of silt content on frost heaving should be paid attention to. The harmfulness of weak frost heaving behavior for ballast linear engineering treatment is greater than normal structures, and more attention should be paid.

关 键 词：板结道床 冻胀 含泥量 含水率 

分 类 号：U213.7[交通运输工程—道路与铁道工程]