LIAO Haohao,CHEN Youliang,LI Shiming,et al.Mechanical Properties of Sandstone under Freeze⁃thaw Cycling and Chemical Corrosion[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(06):1009-1017.
LIAO Haohao,CHEN Youliang,LI Shiming,et al.Mechanical Properties of Sandstone under Freeze⁃thaw Cycling and Chemical Corrosion[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(06):1009-1017. DOI: 10.13409/j.cnki.jdpme.2020.06.021.
Mechanical Properties of Sandstone under Freeze⁃thaw Cycling and Chemical Corrosion
In this paper, test specimens taken from Yunnan were selected to study the mechanical properties of sandstone after chemical corrosion. The uniaxial compression strength test and three-point bending test were carried out on sandstone in 3 hydrated environments (HCl solution of PH=3, aqueous solution of PH=7, NaOH solution of PH=12), and at different freeze-thaw cycling temperature (-20℃,-30℃,-40℃and -50℃). The test results show that the deterioration damage mode of the sandstone under freezing-thaw cycling and chemical corrosion is mainly affected by the freeze-thaw cycling temperature and its environment. In different solutions, the uniaxial compressive strength, modulus of elasticity, peak stress and fracture toughness gradually reduce with the decrease of freeze-thaw cycling temperature. The damage variable of the sandstone after immersed in HCl solution is the largest, while the sandstone is strengthened in the solution of NaOH, which repairs the sandstone.
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