兰新铁路路基冻胀特征及冻害整治措施研究  

Frost Heaving Characteristics of Lanzhou-Xinjiang Railway Subgrade and the Treatment of Frost Damage

作　　者：夏琼[1] 杨有海[1] 窦顺 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中铁西北科学研究院有限公司,甘肃兰州730000

出　　处：《冰川冻土》2011年第1期164-170,共7页Journal of Glaciology and Geocryology

基　　金：铁道部科技研究开发计划项目(2008G014)资助

摘　　要：兰新铁路尖山至大青口段线路在海拔2 100m左右,冬季气候寒冷,路基填料属易冻胀土,在路基土冻前含水量较大的前提下,线路在冬季必然发生冻胀变形.为了有效控制路基冻胀量,通过现场和室内试验对该段路基土的土质、冻结特征、冻胀特征等进行试验研究.结果表明:路基面以下60cm范围内土层冻胀量占整个冻结层总冻胀量82%;在最适宜冻结速率下瞬时冻胀量达到极大值,分层冻胀率与平均冻胀率的大小关系在2/3冻结深度处发生改变;冻胀速率的大小并不能直接反映瞬时冻胀量的大小,还应考虑冻结速率.选用了软式透水管整治冻害,整治效果明显.Within the Jianshan to Daqingkou Section of Lan-Xin Railway,2 100 m above sea level,the subgrade fillings are prone to frost heave in winter,thus deformation due to winter frost heaving takes place certainly in the sections with high water content of subgrade soil.In order to control subgrade frost-heaving amount effectively,field test and laboratory test are performed to study soil property,freezing features and frost heaving characteristics of the subgrade soils.The results show that 82 percent of total frost-heaving amount is produced within the surface layer of subgrade,60 cm in depth;a maximum of instantaneous frost-heaving amount can occur at an optimum freezing rate;the relationship between layering frost-heaving ratio and average frost-heaving ratio changes at the 2/3 freezing depth;the frost-heaving rate can not reflect the instantaneous frost-heaving amount directly and it is necessary to consider the freezing rate.Soft permeable pipe is suggested to treat the frost damage and the treatment effect is evident.

关 键 词：路基 瞬时冻胀量 冻胀率 冻胀速率 软式透水管 

分 类 号：U213.14[交通运输工程—道路与铁道工程]