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Mechanical properties and fracture evolution process of Beishan granite under tensile state

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Abstract

Tensile properties are one of the most important types of rock properties. Direct tensile tests (DT), Brazilian splitting tests (BT), and uniaxial compression tests (UCTs) were performed to investigate the tensile properties of Beishan granite. The acoustic emission (AE) and deformation were recorded by PCI-2 AE monitoring system and extensometer. The stress–strain characteristics were studied in detail, and the relationships between the strength, strain, and elastic modulus values obtained by the DT and the UCT were respectively analyzed. Crack initiation and propagation during the BT were researched by the spatiotemporal features of AE events, and the results reveal that although a few cracks appeared near the loading points at the beginning of the test, cracks still initiated at the disc center and propagated to the loading points. The b value and AF/RA value were used to study the crack modes of the rock. The results indicate the failure of the specimens during the BT was more severe than that during the DT, and the proportion of rapidly expanding large cracks in the specimens during the BT was higher than that during the DT; the crack modes during the DT were more diverse. Furthermore, a statistical damage constitutive model of Beishan granite was established and verified by the accumulation of AE events. Moreover, the change process of the damage variable D was further divided into three stages, namely the slow increase stage, transition stage, and rapid increase stage.

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Funding

This study was financially supported by the NSFC (U20A20266).

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Correspondence to C. S. Wang.

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Wang, C.S., Liu, J.F., Zhao, Y.W. et al. Mechanical properties and fracture evolution process of Beishan granite under tensile state. Bull Eng Geol Environ 81, 274 (2022). https://doi.org/10.1007/s10064-022-02765-1

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  • DOI: https://doi.org/10.1007/s10064-022-02765-1

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