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Disintegration behavior and mechanism of carbonaceous mudstone under acidic corrosion and wetting-drying cycles

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Abstract

The disintegration of carbonaceous mudstone under the recurring action of acid rain increases the risk of geohazard occurrence. In this paper, a series of disintegration tests were conducted at pH values of 1, 3, 5, and 7 to investigate the disintegration behavior and disintegration mechanism of carbonaceous mudstone under acidic corrosion and wetting-drying cycles. The disintegration process can be divided into three stages (e.g., water absorption saturation, fracture expansion, and surface exfoliation). With the increase of wetting-drying cycles, the particle size of carbonaceous mudstone gradually decreases, and the particle size gradation curve of carbonaceous mudstone after disintegration is S-shaped, which is consistent with Weibull function distribution. A smaller value of the Weibull model parameter λ (the scale parameter) results in a smaller average particle size of the carbonaceous mudstone disintegration products, and the value of k (the shape parameter) reveals the degree of drastic change in the grain gradation of carbonaceous mudstone k and λ together reflect the rate of carbonaceous mudstone disintegration. A smaller decrease in the disintegration ratio and decreasing rate is observed with an increase in the number of wetting-drying cycles. The disintegration ratios of carbonaceous mudstone under the four pH conditions from largest to smallest are pH = 7 > pH = 5 > pH = 3 > pH = 1. The disintegration of carbonaceous mudstone is mainly caused by hydration-swelling, adsorption-fracturing, and dissolution-erosion. The presence of acid promotes the dissolution-erosion of carbonate in carbonaceous mudstones, which in turn accelerates the hydration-swelling and adsorption-fracturing as well as the disintegration ratio of carbonaceous mudstones.

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The data used to support the findings of this study are available from the corresponding author upon request.

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Funding

This work was supported by the National Natural Science Foundation of China (Nos. 51838001, 51878070, 51878078 and 51678074), the Natural Science Foundation of Hunan Province, China (No. 2015JJ6004), and the Research and Development Projects in Key Fields of Hunan Province, China (No. 2019SK2171), Hunan Province Outstanding Youth Fund Project(No. 2023JJ10045).

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Correspondence to Ling Zeng.

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Fu, Hy., Zha, HY., Zeng, L. et al. Disintegration behavior and mechanism of carbonaceous mudstone under acidic corrosion and wetting-drying cycles. Bull Eng Geol Environ 82, 168 (2023). https://doi.org/10.1007/s10064-023-03192-6

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  • DOI: https://doi.org/10.1007/s10064-023-03192-6

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