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Experimental Investigation of Damage Evolution Characteristics of Coral Reef Limestone Based on Acoustic Emission and Digital Volume Correlation Techniques

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Abstract

The variation of pore structure results in a significant difference in physical–mechanical properties within coral reef limestone (CRL). The acoustic emission (AE) and digital volume correlation (DVC) techniques were utilized to investigate the damage evolution characteristics of four structural types of CRL under uniaxial compression. The influence of pore structure on the fracture mechanism of CRL was revealed from the microscopic perspective. The results suggested that the failure patterns of CRL specimens gradually transferred from brittle tensile failure to ductile shear failure with the increase of porosity. Based on the AE technique, the damage evolution process of CRL was comparatively analyzed. The AE evolution characteristics of the coral framework limestone (CFL) and coral boulder limestone (CBL) were similar to conventional brittle rocks. Furthermore, the coral gravel limestone (CGL) and coral calcarenite limestone (CCL) stimulated a considerable amount of AE signal during the initial compression stage by adjustment of sand particles. Using the computerized tomography (CT) scanning-based DVC method, the strain field distribution after the failure of CRLs with different structures was revealed, and the interaction mechanism between pore and crack was analyzed. Finally, the crack volume strain (CVS), lateral strain response (LSR), and AE cumulative energy were used to determine the crack initiation stress range in CRLs of four structures. According to the range of crack initiation stress, the results obtained by the on-site microseismic monitoring and in-situ stress measurement can be used to determine the stress state and plastic zone extent in the coral reef strata, which provides a reference for the design of support schemes in the construction of island reefs.

Highlights

  1. 1.

    With the increase of porosity, the failure pattern of coral reef limestone gradually changed from brittle tensile failure to ductile shear failure.

  2. 2.

    The strain field anisotropy of coral framework, coral boulder, and coral gravel limestones was more pronounced.

  3. 3.

    The speckle quality of coral boulder and coral gravel limestones was more robust than that of coral framework and coral calcarenite limestones.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This research is supported by the National Natural Science Foundation of China, No. 41877267, 41877260, the Priority Research Program of the Chinese Academy of Science, Grant No. XDA13010201, and the Special Foundation for National Science and Technology Basic Research Program of China, No. 2018FY10010003. In addition, the authors would like to express their gratitude to EditSprings (https://www.editsprings.cn) for the expert linguistic services provided.

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Correspondence to Qingshan Meng.

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No conflict of interest exits in the submission of this manuscript, and manuscript is approved by all authors for publication. I would like to declare on behalf of my co-authors that the work described is original research that has not been published previously. All the authors listed have approved the manuscript that is enclosed.

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Wu, K., Meng, Q., Wang, C. et al. Experimental Investigation of Damage Evolution Characteristics of Coral Reef Limestone Based on Acoustic Emission and Digital Volume Correlation Techniques. Rock Mech Rock Eng 56, 2357–2374 (2023). https://doi.org/10.1007/s00603-022-03186-y

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  • DOI: https://doi.org/10.1007/s00603-022-03186-y

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