Abstract：Research purposes: With seasonal frozen soil regions increasing passenger line engineering, security and stability of its subgrade has become an important factor affecting driving safety. The freeze-thaw cycles destroys the railway subgrade frequently in seasonal frozen soil regions. We coupled the temperature field with deformation field, and analysed the influence of how the thermal effects to the subgrade deformation. We also predicted the temperature field’s change and the deformation trend in subgrades many years later. It will provide reliable technical support to subgrade frost heaving protection.
Research conclusions: (1)In seasonal frozen soil regions，the subgrade’s maximum frost depth appears ahead of time， it will decrease when the negative temperature period becomes shorter. The subgrade deformation is less than 15 mm under the effect of the temperature and force fields. It meets the settlement control standard requirement. (2)The fillings have no frost heave or slight frost heave，which meets the negative temperature requirement in seasonal frozen soil regions. (3)Under the effect of temperature，there is no frost heave disaster in the subgrade during the 20 years’ service time. (4) The paper provides the valuable reference to the study on subgrade thermo-mechanical coupling in the freeze-thaw cycles，has great significance in the development of subgrade anti-frost techniques in seasonal frozen soil regions，and also provides the theoretical evidengce for the construction of China's railway passenger line in seasonal frozen soil areas.
Yang Xu , Yan Songhong , Ma Lina. Analysis on and Prediction of Temperature Field of Tunnels Located in Seasonal Frozen Area [J].Tunnel Construction , 2012 (1):57-60 , 71.
Sun Lei, Zhang Xiangdong, Lan Changyu. The Numerical Simulation of Settlement of Seasonal Frozen Sabgrade under Cyclic Freeze-thaw[J].Sichuan Architecture, 2010 (5):109-110.
[3]朱东海.季节性冻土路基冻胀时的稳定性分析[J].路基工程，2008(5):91-93.
Zhu Donghai. Stability analysis of Subgrade in Seasonal Frozen Soils [J].Subgrade Engineering, 2008(5): 91 - 93.
Zhong Minhui, Wang Shaobin. Analysis of Frost Heaving for Seasonal Frost Soil Subgrade and Its Treatment Measures [J].Railway Construction, 2009 (4):96-98.
Kong Lingqi, Yuan Wenzhong, Wang Yun, etc. Numerical Simulation of Subgrade Frost Boiling in Seasonal Frozen [J].Sichuan Architecture, 2008(6): 69 - 71.
[6]张文，宋浑.季节性冻土路基融沉时的稳定性分析[J]. 路基工程，2008(3);55-56.
Zhang Wen, Song Hui. Stability Analysis on Periodic Frozen Ground Subgrade During Thaw Subsidence [J]. Subgrade Engineering, 2008(3):55-56.
[7]童长江，管枫年.土的冻胀与建筑物冻害防治[M].北京:水利电力出版社，1985.
Tong Changjiang, Guan Fengnian. Frost Heave and Frost Damage Prevention of Buildings Soil[M]. Beijing: Water Conservancy and Electric Press,1985.
2013, Vol. 30 
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