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Quantitative Analysis on Tensile Mechanical Properties and Microscopic Characteristics of Acidified Limestone

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Abstract

The hard rock roof in coal mines is prone to failure, causing catastrophic disasters due to highly concentrated stresses. Acidification can effectively degrade the resulting mechanical properties of hard rocks. Therefore, quantitative assessment and understanding of the tensile properties and microscopic characteristics of acidified limestone is essential for rock engineering. In this work, Brazilian splitting tests (BSTs) were carried out on acid-immersed limestone specimens and the resulting properties were determined by digital image correlation (DIC), 3D scanning, and nanoindentation. The effects of varying pH values on tensile properties, splitting surface morphology, and nanoindentation characteristics were investigated. The results indicate the tensile strength decreases with the decrease in pH value, while the splitting failure mode gradually transitions from I-shaped tensile to Y-shaped tensile-shear failure mode. Further, DIC results indicate that the maximum principal strain increases gradually. The evaluation of the splitting surface also showed that the roughness, relative fluctuation height, angle, area ratio of the splitting surface, and the range of indentation depth increase as the pH value decreases, while the relative fluctuation height increases the most. Nanoindentation confirms that the micromechanical parameters (hardness, modulus, and fracture toughness) degrade to varying degrees due to the acidification. Finally, the correlation between tensile strength and micromechanical parameters was developed for a better understanding of the microscopic deterioration mechanism in acidified limestone.

Highlights

  • Acidification significantly affects the tensile strength and failure mode of limestone specimens.

  • Micromechanical properties are gradually decreased as pH decreases.

  • Tensile strength and micromechanical parameters are correlated.

  • Acidification modifies the pore structure and micromechanical properties, reducing tensile strength.

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Data availability

The data that support the findings of this study can be available from the corresponding author upon reasonable request.

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Funding

This study is supported by the National Natural Science Foundation of China [Grant NO: U22A20234], and Hubei Province key research and development project [Grant NO: 2023BCB121].

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Authors and Affiliations

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    Xuewei Liu, Sai Wang, Bin Liu & Qingcheng Liu

  2. Faculty of Engineering, China University of Geosciences, Wuhan, 430074, China

    Sai Wang & Jin Luo

  3. The Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, 430072, China

    Quansheng Liu

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  1. Xuewei Liu
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  2. Sai Wang
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  3. Bin Liu
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  6. Jin Luo
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Correspondence to Bin Liu.

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Liu, X., Wang, S., Liu, B. et al. Quantitative Analysis on Tensile Mechanical Properties and Microscopic Characteristics of Acidified Limestone. Rock Mech Rock Eng (2024). https://doi.org/10.1007/s00603-024-03922-6

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