Experimental study on microstructure response and mechanical properties of weak interlayer in acidic environment

Shaorui Sun (), Wuchao Wang (), Jihong Wei (), Jinglei Song (), Yongxiang Yu (), Wei He () and Jixing Zhang ()
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Shaorui Sun: Hohai University
Wuchao Wang: Hohai University
Jihong Wei: Hohai University
Jinglei Song: Jiangsu Province Geological Survey Institute
Yongxiang Yu: Jiangsu Province Geological Survey Institute
Wei He: Jiangsu Province Geological Survey Institute
Jixing Zhang: Jiangsu Province Geological Survey Institute

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2022, vol. 112, issue 1, No 14, 327-348

Abstract: Abstract Due to the infiltration of acid rain and industrial wastewater, the slope has been in an acidic environment for a long time. This reduces the stability of the slope and increases the probability of geological disasters. The weak interlayer samples were immersed in sulfuric acid solutions with different pH values for different times. X-ray diffraction (XRD), energy dispersive analysis of X-ray (EDAX), ion concentration monitoring, triaxial compression test, unconfined compressive tests and scanning electron microscopy (SEM) were used to study the mineral composition, mechanical strength and microstructure of the weak interlayers in various acidic environments. The results show that the main mineral components in the weak interlayers are quartz, pyrophyllite, hydromica and kaolinite. When the samples are immersed in the solution for a short time (30d), the pH value of the immersion solution is the dominant factor affecting the undrained strength of the sample. When the samples are immersed for a long time (60d or 120d), the main factor affecting the undrained strength of the sample is the immersion time. The unconfined compressive strength of the samples corroded by sulfuric acid is reduced, which is particularly evident in samples with low water content. The microstructure parameters of the samples show that with the increase of immersion time, the area of mineral particles decreased gradually and the pore ratio of samples increased gradually. The microstructure images and microstructure parameters of the samples are consistent with their macroscopic physical and mechanical properties.

Keywords: Weak interlayer; Acid environment; Mineral composition; Mechanical properties; Microstructure (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11069-021-05183-w

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