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Study on the change of physical properties of sandstone under action of acidic drying-wetting cycles and discrete element simulation

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Abstract

This study investigated the changes in the physical parameters of sandstone (solution pH, mass, P-wave velocity, and porosity) and mechanical strength (tensile strength) under acidic drying-wetting cycles. Additionally, the particle flow code (PFC) was used to simulate the drying-wetting cycles. The results reveal that the pH range of the acidic solution is much larger than that of the neutral solution. The changes of the mass and P-wave velocity are consistent and both exhibit a decreasing trend, which slowed down in stage IV. Compared with the neutral solution, the acidic solution could accelerate the damage peak of the specimen and cause early destruction. The “S” curve variation of porosity indicates that the decrease of physical parameters in stage IV was caused by the slowdown of porosity growth. In turn, this indicates that the soluble material in the specimen decreased, and the number of drying-wetting cycles could not excite new crack generation, which resulted in the slowdown of the loss rate. The results obtained by the Brazilian splitting test (BTS) reveal that the damage in the acidic solution of the specimen first deformed by compression and then by splitting damage, which is different to the direct splitting damage in the neutral solution. The simulation also proves that the specimen mainly exhibited extrusion deformation in the y-direction and tensile damage in the x-direction. The contact between the particles inside the specimen gradually decreased as the cycles progressed. Finally, damage occurred under low pressure.

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Availability of data and material

The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors acknowledge School of Civil Engineering and Architecture, Anhui University of Science and Technology for their support to perform this research.

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Xin Huang performed the experiments and analyzed the test data; Xin Huang wrote the manuscript; Jianyong Pang conceived the experiment and provided guidance and suggestion.

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Correspondence to Xin Huang.

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Huang, X., Pang, J. Study on the change of physical properties of sandstone under action of acidic drying-wetting cycles and discrete element simulation. Bull Eng Geol Environ 80, 7773–7790 (2021). https://doi.org/10.1007/s10064-021-02451-8

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  • DOI: https://doi.org/10.1007/s10064-021-02451-8

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