Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (4): 1161-1168.doi: 10.16285/j.rsm.2019.0699

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of differential frost heave of fractured rock mass

XIA Cai-chu1, 2, WANG Yue-song1, 2, ZHENG Jin-long3, LÜ Zhi-tao1, 2   

  1. 1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Sichuan Provincial Transport Department Highway Planning, Survey, Design, and Research Institute, Chengdu, Sichuan 610041, China
  • Received:2019-04-17 Revised:2019-07-21 Online:2020-04-11 Published:2020-07-01
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51778475, 41472248) and the Department of Transportation of Sichuan Province (2016B2-4).

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Abstract: The frost heave force is one of the main reasons that induces the tunnel freezing damage. The frost heave force of tunnel is mainly caused by the differential frost heave of surrounding rock. The fracture will further affect the differential frost heave of rock mass. In this article, the calculation formulation for differential frost heave coefficient of rock mass is derived, and some findings concerning the coefficient of differential frost heave are drawn as follows. The differential frost heave coefficient increases with increasing the angle ? between fracture and temperature gradient. As temperature gradient rises, the differential frost heave coefficient increases. The influence of fracture ratio on differential frost heave of surrounding rock depends on the angle ? between fracture and temperature gradient. When ? is small, decreases with the increase of fracture ratio. When ? is large, increases with the increase of fracture ratio. The influence of fracture on differential frost heave of rock mass is related to the lithology of rock mass. The fracture has greater influence on the rock mass with smaller porosity. According to the calculation formula of differential frost heave coefficient of fissured rock mass, the range of differential frost heave coefficient of fissured rock mass with different lithology and different grades can be obtained. Therefore, in the design of tunnel in cold area, the frost heave force of tunnel surrounding rock acting on lining can be calculated more accurately, which plays an important role in the design of tunnel in cold area, and also promotes studies of the frost heave force of subgrade, slope and other projects in cold area.

Key words: rock mass, fracture, differential frost heave coefficient

CLC Number: 

  • TU 452
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