摘要
青藏铁路西格段环青海湖路基的季节性冻胀和融沉,直接影响列车行驶的舒适度,严重时甚至会危及行车安全。以环青海湖段路基冻害为背景,通过选取典型冻害断面,进行原位挖探试验及室内试验,从土质、水分和温度三个方面分析了环湖段路基冻害成因和冻害机理。结果表明:环湖段路基冻害的主要原因是基床表层无良好的隔水层和排水设施,降雨入渗导致路基土体中的粉质黏土层含水率较大,当温度低于冻结温度时,土中水冻结,引起路基冻胀。
Seasonal frost heaving and thaw settlement of Qinghai-Tibet railway subgrade around Qinghai Lake directly affected the comfort degree of train,and even endangered the traffic safety. Based on frost damage of subgrade in Qinghai Lake section,typical frost damage sections were chosen to conduct in-situ tests and laboratory tests,the causes and mechanisms of subgrade frost damage in Qinghai Lake section were analyzed from the aspects of soil texture,moisture and temperature.Test results show that the main causes of frost damage in the subgrade around the lake are of the bad water retaining layer and invalid drainage facilities on the surface of the subgrade. Rainfall infiltration results in greater moisture content of silty clay in subgrade soil. When temperature is lower than the freezing temperature,water in the soil was frozen and led to frost heave of subgrade.
出处
《铁道建筑技术》
2017年第12期96-98,119,共4页
Railway Construction Technology
基金
青藏铁路公司科技研究开发计划课题(QZ2015-G01)
关键词
季节性冻土区
铁路路基
冻害
成因分析
seasonal frozen soil region
railway subgrade
frost damage
causal analysis
