Microscopic Damage to Limestone under Acidic Conditions: Phenomena and Mechanisms

Xing-ming, Chen; Li, Xiaoping; Luo, Haiyong; Long, Linjian; Liu, Chuanju

doi:10.3390/su141811771

Cited by 5 publications

(2 citation statements)

References 33 publications

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“…In an acidic environment, the microscopic pore structure of limestone exhibits fractal characteristics. The fractal dimension first increases, then decreases, and finally increases with increasing soaking time (Chen et al 2022).…”

Section: Introductionmentioning

confidence: 95%

Study on the mechanical and damage properties of laminated limestone under acid mine drainage dissolution

Ding,

Zuo,

2024

Geomech. Geophys. Geo-energ. Geo-resour.

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To explore the chemical and mechanical effects of acid mine drainage on water and rock, acid mine drainage (AMD) dissolution tests, triaxial compression tests, and acoustic emission tests were performed on limestone rock samples with different bedding dip angles. Combined with scanning electron microscopy and nuclear magnetic resonance analyses, the changes in the internal pores and surface morphologies of the rock samples before and after dissolution were analyzed. The results were as follows. (1) AMD dissolution mainly occurred in the shallow surfaces and bedding planes of the limestone samples. During dissolution, the shape of the matrix crystal disappeared to form small pores, and residual substances appeared during the dissolution of the bedding plane. These small pores were prone to the creation of large honeycomb-like dissolved pores. (2) With increasing bedding plane angle, the compressive strengths and elastic moduli of the limestone samples exhibited V-shaped distributions. Additional branch cracks were derived from the limestone samples after dissolution, and dissolution reduced the mechanical strength of the limestone by decreasing the crack initiation stress and damage stress. (3) With increasing bedding dip angle, the uniaxial failure modes of the rock samples changed from matrix tensile failure and shear failure along the bedding plane to plane tensile failure. After dissolution, the limestone matrix was prone to cracking and spalling along the surface of the sample. (4) There were differences in the triaxial compression failure modes between the dissolved limestone and the undissolved limestone. When α = 0° or 90°, the limestone samples formed additional branch fissures after dissolution. When α = 45°, the formation of penetrating cracks along the bedding plane was obviously controlled by the bedding plane. (5) A chemical–mechanical damage model was established and modified by the compression coefficient K, which could effectively reflect the deformation of the dissolved rock sample during loading.

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Section: Introductionmentioning

confidence: 95%

Study on the mechanical and damage properties of laminated limestone under acid mine drainage dissolution

Ding,

Zuo,

2024

Geomech. Geophys. Geo-energ. Geo-resour.

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“…The advancement of detection technology has increasingly attracted scholars to apply it in rock mechanics engineering research. Techniques such as acoustic emission, infrared remote sensing, digital speckle, CT scanning, electron microscopy scanning, and others have all seen successful applications [1][2][3][4][5][6][7][8]. Acoustic emission involves using specialized equipment to monitor and record the sound waves produced by microcracks or displacement released internally in rocks due to stress concentration during loading.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission characteristic of sandstone and sandstone like material under multi-path loading

Zhuang,

Peng,

Zhao

et al. 2024

PLoS ONE

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Using spline interpolation to select proportions of similar materials, a comparative analysis of the fracturing behavior of sandstone specimens and similar material specimens was conducted through Brazilian splitting tests under multi-path loading. The study revealed that during stepwise loading, both sandstone and similar materials exhibited memory effects and plastic deformation. However, under constant velocity loading, the relationship between force and displacement in sandstone showed linearity after compaction. Employing MATLAB optimization algorithms for the inversion of acoustic emission event information, the distribution of fracture points, and the evolution of cracks were analyzed. The findings indicated that under stepwise loading, both sandstone and similar materials exhibited banded distribution of peak frequencies, with sandstone concentrated in the mid-low-frequency range and similar materials leaning towards the low-frequency range. The amplitude-frequency characteristics of acoustic emission signals suggested that initially, sandstone produced low-frequency, low-amplitude signals. As cracks developed, these signals gradually transformed into high-frequency, high-amplitude signals, ultimately leading to macroscopic failure. The ringing counts and b-values of sandstone displayed an approximate "W" shape distribution, with a subsequent decrease in b-values during final failure. In contrast, the acoustic emission counts were inversely related to b-values. Similar materials exhibited slightly more acoustic emission counts than sandstone, with relatively lower b-values. The crack development process of both sandstone and similar materials was confirmed through these observations. From the perspective of section initiation and local damage, sandstone and similar materials exhibited similar failure characteristics. The proportions of quartz sand: cement: water = 9:1:0.9 in similar materials demonstrated the most similar characteristics to sandstone in terms of mechanical loading, acoustic emission features, and failure morphology. This suggests that these similar materials can be used as substitutes for sandstone in analogous simulation experiments. The study provides theoretical support for understanding rock fracture mechanisms, offers guidance for the selection and proportioning of similar materials, and holds significance for predicting and controlling rock fracture behavior in engineering applications.

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

Liu,

Wang,

Liu

et al. 2024

Rock Mech Rock Eng

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Microscopic Damage to Limestone under Acidic Conditions: Phenomena and Mechanisms

Cited by 5 publications

References 33 publications

Study on the mechanical and damage properties of laminated limestone under acid mine drainage dissolution

Study on the mechanical and damage properties of laminated limestone under acid mine drainage dissolution

Acoustic emission characteristic of sandstone and sandstone like material under multi-path loading

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

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