Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (5): 1587-1596.doi: 10.13278/j.cnki.jjuese.20200285

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Model Test of Reinforced Expansive Soil Slope Stability in Freeze-Thaw Cycles

Lü Jianhang1, Yang Zhongnian1, Shi Wei1, Li Guoyu2, Ling Xianzhang1,3, Zhang Yingying1   

  1. 1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China;
    2. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    3. School of Civil Engineering, Harbin Institute of Technology, Harbin 150001, China
  • Received:2020-12-02 Online:2021-09-26 Published:2021-09-29
  • Supported by:
    Support by the Foundation for Opening of State Key Laboratory of Frozen Soil Engineering (SKLFSE201601), the Taishan Scholars Special Fund Project of Shandong Province (2015-212) and the National Major Scientific Research Instrument Development Fund (41627801)

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Abstract: China has a large area of frozen soil, and the long-term stability of the expansive soil slopes in the seasonal frozen area can be guaranteed by controlling the deterioration of the slopes in freezing and melting cycles. In order to determine the role of geogrid in the stability of the expansive soil slopes during the freeze-thaw cycle, the model test of the expansive soil slope is carried out in this paper. The results show that:1) The geogrid can restrain the freeze-thaw cracks of expansive soil, make the crack development more uniform, and reduce the slope displacement; 2) The reinforced material can inhibit the water migration and heat conduction of the slope and reduce the change of soil pressure; 3) The reinforced treatment of expansive soil slope can significantly reduce the fluctuation of water content, so as to reduce the swelling and shrinking of expansive soil caused by the change of water content; 4) Different from ordinary clay, the expansive soil slopes show the characteristics of freeze shrinkage and thaw expansion in the freeze-thaw cycle, and the slope reinforcement can effectively improve the freeze-thaw stability of expansive soil slopes in frozen soil areas, which has engineering application value.

Key words: expansive soil, slope stability, slope reinforcement, freeze-thaw cycles, cracks

CLC Number: 

  • P642.2
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