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Content available Laboratory study of dynamic fracture in pre-drilled boreholes and associated host rock behaviour
Zhang Cheng Guo, Gu Xuebin, Guo Weiyao, Gong Xufei, Fang Hengyu, Huang He
Journal of Theoretical and Applied Mechanics
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2024
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Vol. 62 nr 1
47--60
EN
To better understand the influence of the openings and their relationship with the host rock, laboratory tests were conducted on a range of sandstone specimens with different proportions of D/H (hole diameter/specimen height) ratio. Acoustic emission (AE) and video monitoring were used to capture the rock specimen responses. The results showed that if the D/H ratio was less than 0.3, the fracture mode occurred in the hole, indicating that this was an appropriate ratio. In addition, the “short quiet period” of AE energy can be used as a precursor for determining the burst in the opening.
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