摘要
合理的防冻胀基床结构是季节性冻土地区高速铁路防冻胀的关键。本文通过开展哈大高速铁路正线与线外现场足尺试验,对局部保温措施与全断面保温措施的有效性进行了研究。试验结果表明:路肩和线间局部保温措施只能减小保温部位的冻结深度和冻胀,不能抑制轨道结构处的冻胀,不适用于季节性冻土地区高速铁路防冻胀设计;全断面保温措施能够降低轨道结构处的冻结深度和冻胀,有较好的防冻胀效果,季节性冻土地区高速铁路路基可采用全断面保温基床结构进行防冻胀设计。
The reasonable frost-heaving prevention structure is the core part of subgrade design for the high speed railway in seasonal frozen soil region.The paper studied on the validity of partial and overall thermal insulation methods by full scale field tests which were carried out on and outside the operating line separately.The experimental results show that the partial thermal insulation method,in which the thermal insulation boards are put on the shoulder and the center of the line,can just protect the parts with the thermal insulation boards,but the frost-heaving at the track structure can not be restrained.Partial thermal insulation method is not workable for the frost-heaving prevention design of high speed railway in seasonal frozen soil region.But the overall thermal insulation method can reduce the freezing depth and frost-heaving at the track structure,has better frost-heaving prevention effect than the partial thermal insulation method,and is workable to prevent subgrade frost-heaving for high speed railway in seasonal frozen soil region.
作者
闫宏业
YAN Hongye(Railway Engineering Research Institute,China Academy of Railway Sciences Group Co. Ltd. ,Beijing 100081,China)
出处
《铁道建筑》
北大核心
2019年第2期1-4,共4页
Railway Engineering
基金
中国铁路总公司科技研究开发计划(2016G003-J
2016G003-F)
中国铁道科学研究院基金(2016YJ023)
关键词
高速铁路
季节性冻土地区
现场试验
基床保温结构
冻胀
冻结深度
High speed railway
Seasonal frozen soil region
Field test
Thermal insulation subgrade structure
Frost-heaving
Freezing depth
