Influence of wing crack propagation on the failure process and strength of fractured specimens

作者：Yang, Hengtao; Lin, Hang^*; Chen, Yifan^*; Wang, Yixian; Zhao, Yanlin; Yong, Weixun; Gao, Feng

来源：Bulletin of Engineering Geology and the Environment, 2022, 81(1): 71.

DOI：10.1007/s10064-021-02550-6

• Fractured specimen
• Prefabricated wing cracks
• Peak strength
• DIC (digital image correlation)
• PFC numerical simulation

The wing cracks are usually the first crack that appears in the loading process in studies about fractured rocks, and a certain correlation exists between the wing crack propagation process and the peak strength of fractured specimens. To further explore the correlation between wing crack propagation and the peak strength of specimens, specimens containing the main flaw and prefabricated wing cracks were chosen as the test object, and compression tests and numerical simulations were carried in this study. To some extent, it can be regarded as a step-by-step simulation and reproduction of the propagation process of wing cracks. The loading and monitoring processes and the analysis of results reveal that specimens with the prefabricated wing cracks show more plasticity in the loading process than the other specimens without the prefabricated wing cracks. However, the length of prefabricated wing cracks does not affect the peak strength of the specimen. The wing crack has a critical length of the stable propagation for each specimen with a single flaw under uniaxial compression, which determines the peak strength of specimen. When the length of wing cracks extends to this critical value, the specimen reaches its peak strength. On this basis, the peak strength of the fractured specimen can be solved using this critical value. This paper provides a reference for the theoretical analysis of the peak strength of fractured specimens.

• 单位
  湖南科技大学