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Volume 40 Issue 3
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HUANG Shi-bing, LIU Quan-sheng, LIU Yan-zhang, CHENG Ai-ping. Frost heaving pressure and characteristics of frost cracking in elliptical cavity (crack) of rock mass under coupled thermal-mechanical condition at low temperature[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(3): 459-467. DOI: 10.11779/CJGE201803009
Citation: HUANG Shi-bing, LIU Quan-sheng, LIU Yan-zhang, CHENG Ai-ping. Frost heaving pressure and characteristics of frost cracking in elliptical cavity (crack) of rock mass under coupled thermal-mechanical condition at low temperature[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(3): 459-467. DOI: 10.11779/CJGE201803009
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Frost heaving pressure and characteristics of frost cracking in elliptical cavity (crack) of rock mass under coupled thermal-mechanical condition at low temperature

  • 1. School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;
    2. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan, 430081, China;
    3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

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  • Received Date: January 16, 2017
  • Published Date: March 24, 2018
    Graphical Abstract
    • Abstract
  • The frost heaving pressure is induced by water-ice phase transition in water-bearing cracks in addition to thermal stress at low temperature in rock engineering in cold regions. The freeze-thaw damage and cracking are caused by the combined action of frost heaving pressure with thermal stress. Considering the influence of thermal stress on elliptical cavity (crack), an analytical equation for the frost heaving pressure is deducted. Based on the maximum tensile-stress criterion, the maximum tensile stress and frost cracking angle on the elliptical cavity (crack) are derived. Besides, the critical condition for simplifying elliptical cavity to crack is also established under coupled thermo-mechanical condition at low temperature. Finally, the developed method for the equivalent thermal expansion coefficient is adopted to simulate the frost heaving pressure in crack and stress field at crack tip. The research results show that: (1) The maximum frost heaving pressure in the elliptical cavity is affected by the thermal expansion of rock, dip angle of crack, ratio of crack length to width χ and so on; (2) When χ≥10, the flat elliptical cavity can be simplified as the crack, and the frost cracking appears at the crack tip with obvious stress concentration; (3) The frost heaving pressure and stress field at crack tip can be well simulated by the developed method for the equivalent thermal expansion coefficient.
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