Abstract
To reveal the influence of acid treatment on the mechanical properties of layered rock, bedded limestone specimens were immersed in acid and the mechanical parameters were measured by uniaxial compression testing and acoustic emission monitoring. Three failure modes—split failure, sliding failure, and mixed failure—were observed. Mixed failure was more likely to occur in acid-treated specimens with bedding angles of 30 to 60°. Exposure to acid solution markedly affected the mechanical properties of limestone, which manifested as decreasing uniaxial compressive strength as the dip angle increased from 0 to 45°, then increasing strength from 45 to 90°. For a given dip angle, acid-treated specimens were less strong than untreated specimens. In addition, the strain value of acid-treated specimens at the minimum b-value was much smaller than that of untreated limestone. The deterioration in the mechanical properties of limestone specimens arose from differences in the mineral composition between the bedding planes and the rock matrix, which led to differential dissolution, which in turn resulted in increased porosity and softening of the bedding planes.
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Funding
This work is supported by the National Natural Science Foundation of China (Grant No. 42167025), the Science and Technology Foundation of Guizhou Province ([2020]1Z052), and the first class subject foundation of Civil Engineering of Guizhou Province (QYNYL[2017]0013). They are gratefully acknowledged.
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Mo, Y., Zuo, S. & Wang, L. Mechanical characteristics of thick-bedded limestone with different bedding angles subjected to acid corrosion. Bull Eng Geol Environ 81, 166 (2022). https://doi.org/10.1007/s10064-022-02667-2
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DOI: https://doi.org/10.1007/s10064-022-02667-2