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Fracture analysis of central-flawed rock-like specimens under the influence of coplanar or non-coplanar edge flaws

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Abstract

To better understand the influence of edge flaws on the fracture behaviors of central-flawed specimens, a series of uniaxial compression tests were carried out on the central-flawed rock-like specimens with two edge flaws using a servo-controlled testing apparatus. Two edge flaws were divided into coplanar and non-coplanar distribution (F-L1 and F-L2). The acoustic emission, digital image correlation and high precision video were applied simultaneously to monitor the internal AE signals, surface strain, and crack propagation of rock-like materials, respectively. The results show that the degradation effect of non-coplanar edge flaws on the peak strength, elastic modulus, and crack initiation angle are more significant than that of coplanar edge flaws. When the inclination angle of the central flaw increases from 15° to 60°, the peak strength, elastic modulus, and crack initiation angle decrease. In contrast, the complete initiation angle, total energy density, and accumulated acoustic emission energy first decrease and then increase. The acoustic emission counts and acoustic emission accumulated energy occur a sudden increase when the rock-like specimen deforms into the next stage. Moreover, central flaw controls the initiation of new cracks, whereas edge flaws influence the propagation trajectories of new cracks. Furthermore, the coalescence between the central and edge flaws in the F-L2 specimen is easier to happen than that in the F-L1 specimen.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (11772358), the Water Conservancy Science and Technology Major Project of Hunan Province (XSKJ2019081-10), the Hunan Province Natural Science Foundation of China (2018JJ0540), the Fundamental Research Funds for the Central University of Central South University (2021zzts0281), the CRSRI Open Research Program (SN CKWV2017512/KY), the China Postdoctoral Science Foundation Project(No. 2020M682882) and the Guangdong basic and applied basic research fund (No. 2020A1515110468). These supports were greatly appreciated.

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, China

    Zhizhen Liu, Ping Cao, Kaihui Li & Tao Dong

  2. Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Institute of Deep Earth Sciences and GreenEnergy, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, China

    Fei Wang

  3. Hunan Polytechnic of Water Resources and Electric Power, Changsha, China

    Jingshuo Liu

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  1. Zhizhen Liu
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  2. Ping Cao
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Correspondence to Fei Wang.

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Liu, Z., Cao, P., Li, K. et al. Fracture analysis of central-flawed rock-like specimens under the influence of coplanar or non-coplanar edge flaws. Bull Eng Geol Environ 81, 61 (2022). https://doi.org/10.1007/s10064-021-02554-2

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