›› 2017, Vol. 38 ›› Issue (9): 2559-2566.doi: 10.16285/j.rsm.2017.09.012

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of mechanical characteristics of sandy slate under chemical corrosion

WANG Wei1,2, LI Xue-hao3, ZHU Qi-zhi1,2, SHI Chong1,2, XU Wei-ya1,2   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Jiangsu Research Center for Geomechanical Engineering Technology, Hohai University, Nanjing, Jiangsu 210098, China; 3. The Communications Planning, Surveying and Design Institute of Shanxi Province, Taiyuan, Shanxi 030012, China
  • Received:2016-04-06 Online:2017-09-11 Published:2018-06-05
  • Supported by:

    This work was supported by National Natural Science Foundation of China (11672343, 51679068, 51679071).

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Abstract: This study is to investigate the influence of different chemical solutions and soak time on the mechanical characteristics of sandy slate. Uniaxial compression tests on sandy slate samples are conducted to determine the variations of relative mass, deformation and strength characteristics of sandy slate under different water chemical corrosion conditions. The changes of pH,Ca2+ and Mg2+ concentration of chemical solution are monitored in soaking process. The corrosion mechanism of sandy slate sample soaked by chemical solutions is discussed based on the results of SEM. The results indicate that: with the augmentation of the solution acidity, the corrosion degree of sandy slate increases gradually; sandy slate presents strain softening subjected to chemical solutions, and the softening effect is more evident with the increase of the solution acidity and soak time; the peak strength of sandy slate declines as soaking time extends; the different types and degrees of water-rock interaction lead to different changes in microstructure of sandy slate, presenting loss of cementing material in neutral solution or dissolution of large numbers of mineral particles with large size in acidic solution.

Key words: sandy slate, water-rock chemical interaction, mechanical properties, corrosion mechanism

CLC Number: 

  • TU 411

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