摘要
为了探讨新建锡铁山至北霍布逊地区铁路路基的冻胀变形规律,为高含盐地区路基的设计和修筑提供参考依据,开展了高含盐砂土的室内冻胀试验,根据试验结果判定该类含盐砂土属于强冻胀土。继而结合现场监测数据,利用有限元数值模拟得出了路基为期一年的冻结深度变化规律,最后对冻结期和非冻结期的路基顶面竖向位移进行了对比分析,发现高含盐砂土在冻结过程中的2次相变点温度分别为-6.8℃和-15.2℃,路基冻结期为11月至次年3月,冻结期路基顶面中心抬升21.7 mm。
In order to study the deformation law of subgrade frost heave in Xitieshan to North Hobson railway and provide a reference for the subgrade design and construction of the railway in high saline area,the indoor frost heave test of high saline sand was carried out,whether the type of saline sand belongs to the strong frost heave soil was discussed based on the test results.The variation law of subgrade freezing depth for a period of one year was concluded by combing with the field monitoring data and using the finite element numerical simulation.The vertical displacements of the subgrade top in freezing and non-freezing period were compared and analyzed.The results show that the temperatures of two phase transformation points of high saline sand in the freezing process are-6.8 ℃ and-15.2 ℃ respectively,the subgrade freezing period is from November to March of the next year,and the uplift of subgrade top center is 21.7 mm in freezing period.
作者
潘高峰
吴亚平
刘路
王釭
王军
PAN Gaofeng WU Yaping LIU Lu WANG Gang WANG Jun(School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou Gansu 730070, China Qinghai Local Railway Construction Investment Co., Ltd., Xining Qinghai 810000, China China Railway 16th Bureau Group Co., Ltd., Beijing 100018, China)
出处
《铁道建筑》
北大核心
2016年第9期91-94,共4页
Railway Engineering
基金
国家科技支撑计划(2014BAG05B05)
关键词
含盐砂土
冻胀路基
冻胀试验
数值模拟
Saline sand
Frost heave subgrade
Frost heave test
Numerical simulation
