Experimental study on hydrothermal distribution and frost heave characteristics of coarse-grained graded soil under unidirectional freezing condition
LIU Qianqian1，2，CAI Guoqing1，2，QIN Yuteng2，YIN Fengjie2，LI Jian2，ZHAO Chenggang2
(1. Key Laboratory of Urban Underground Engineering of Ministry of Education，Beijing Jiaotong University，Beijing 100044，China；2. School of Civil Engineering and Architecture，Beijing Jiaotong University，Beijing 100044，China)
Abstract：With the increase of high-speed railway construction in cold and arid areas and the increase in engineering service time，the problem of subgrade frost heave caused by vapor migration has been widely concerned. To deeply explore the hydrothermal distribution and frost heave characteristics of coarse-grained graded packing，a soil column test device considering hydro-thermo-mechanical coupling was developed，and unidirectional freezing tests with different water recharge types，fine particle contents，and fine particle types were carried out. The results show that the position of the freezing front is significantly affected by the water recharge method and the content of fine-grained soil，while the influence of the type of fine-grained soil is relatively small. With the increase in the freezing time，both liquid-vapor recharge and vapor recharge lead to the increasing water content of the specimen，while the former changes faster. In addition，the fine-grained soil content and type can significantly affect vapor migration，resulting in significant differences in water distribution. It is difficult for liquid water in coarse-grained soil to directly rise to the freezing front through suction，and vapor migration is an important factor in the development of frost heave. In the long-term operation of high-speed railways，the problems of subgrade water accumulation and frost heave caused by vapor migration cannot be ignored.
刘倩倩1，2，蔡国庆1，2，秦宇腾2，尹凤杰2，李 舰2，赵成刚2. 单向冻结条件下粗颗粒级配土的水热分布及冻胀特性研究[J]. 岩石力学与工程学报, 2023, 42(9): 2329-2340.
LIU Qianqian1，2，CAI Guoqing1，2，QIN Yuteng2，YIN Fengjie2，LI Jian2，ZHAO Chenggang2. Experimental study on hydrothermal distribution and frost heave characteristics of coarse-grained graded soil under unidirectional freezing condition. , 2023, 42(9): 2329-2340.
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2023, Vol. 42 
