Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (9): 2337-2346.doi: 10.16285/j.rsm.2021.1985

• Fundamental Theroy and Experimental Research •     Next Articles

Correlation between frost heave and microscopic parameters of sand under water vapor recharge

LEI Hua-yang1, 2, 3, ZHANG Wen-zhen1, HUO Hai-feng4, FENG Shuang-xi1, 2, 3, LI Qi-ang4, LIU Han-lei4   

  1. 1. Department of Civil Engineering, Tianjin University, Tianjin 300354, China; 2. Key Laboratory of Coast Civil Structure Safety of Education Ministry, Tianjin University, Tianjin 300354, China; 3. Key Laboratory of Comprehensive Simulation of Engineering Earthquake and Urban-Rural Seismic Resilience, China Earthquake Administration, Tianjin 300350, China; 4. School of Transportation Science and Engineering, Civil Aviation University of China, Tianjin 300300, China
  • Received:2021-11-26 Revised:2022-05-06 Online:2022-09-12 Published:2022-09-12
  • Supported by:
    国家自然科学基金（No.52078334）；国家重点研发计划项目（No.2017YFC0805402）；土木工程防灾国家重点实验室开放基金项目（SLDRCE17-01）。

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Abstract: Water vapor supply can induce frost heave of sand filler. Based on the self-developed moisture migration and frost heaving tester, the variations of sand moisture content, temperature and frost heave with freezing time under gaseous water recharge were studied. The change characteristics of sand microstructure during freezing were examined by stereomicroscope. By combining with the grey correlation theory, the correlation between the macroscopic index, i.e., frost heave and the microscopic parameters was analyzed. Notable frost heaving was observed under water vapor supply, and the frost heave reached 3.45 mm after 7 days of freezing. After sandy soil frost heaving, the proportion of large pore area increased and the proportions of small and medium micropore area decreased, and the change trend of pore number proportion was opposite to that of area proportion, while pore abundance value changed little, pore orientation angle distribution in each interval tended to be more uniform, the probability entropy of pore orientation present an overall upward trend of oscillation, and the pore fractal dimension showed a trend of decrease. In addition, the grey correlation theory is used to establish the correlation between the frost heave and the average pore size and other microscopic parameters, which provides an insight into the microscopic mechanism of sand frost heaving under water vapor supply.

Key words: sandy soil, water vapor supply, frost heave, microstructure characteristics, microstructure parameter

CLC Number: 

  • TU411
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