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Volume 38 Issue 7
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LIU Xin-rong, LI Dong-liang, ZHANG Liang, WANG Zhen. Influence of wetting-drying cycles on mechanical properties and microstructure of shaly sandstone[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(7): 1291-1300. DOI: 10.11779/CJGE201607017
Citation: LIU Xin-rong, LI Dong-liang, ZHANG Liang, WANG Zhen. Influence of wetting-drying cycles on mechanical properties and microstructure of shaly sandstone[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(7): 1291-1300. DOI: 10.11779/CJGE201607017
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Influence of wetting-drying cycles on mechanical properties and microstructure of shaly sandstone

  • 1. School of Civil Engineering, Chongqing University, Chongqing 400045, China;
    2. Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, China;

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  • Received Date: July 11, 2015
  • Published Date: July 24, 2016
    Graphical Abstract
    • Abstract
  • The shaly sandstone which is taken from a slope of the Three Gorges Reservoir is studied. Considering different wetting-drying cycles, the mechanical properties of shaly sandstone are investigated through uniaxial and triaxial compression tests. The microstructural change law of shaly sandstone is also studied using the scanning electron microscopy. The research reveals that with the increasing wetting-drying cycles (1~20), the peak stress, elastic modulus, cohesion and internal friction angle of shaly sandstone decrease. But the peak strain shows two stages of falling and stability. The microstructural change law of shaly sandstone can be summarized as three stages of regular, porous and cracking properties. By using the discrete element software PFC2D, the influences of wetting-drying cycles on contact network of shaly sandstone grains, distribution of chains and distribution of cracks are studied. Based on the test results, the expression of Mohr-Coulomb strength theory for shaly sandstone is modified considering wetting-drying cycles.
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    • References (29)
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