ARTICLE
Laboratory study of the dynamic fracture in pre-drilled boreholes and the associated host rock behaviours
1
College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, China
2
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, China
3
Graduate School of Engineering, Nagasaki University, Nagasaki, Japan
4
Nantun Coal Mine, Yankuang Energy Group Co., Ltd., Jining, China
Submission date: 2023-04-10
Final revision date: 2023-07-30
Acceptance date: 2023-09-06
Online publication date: 2023-12-10
Publication date: 2024-01-31
Corresponding author
Weiyao Guo
College of Energy and Mining Engineering, Shandong University of Science and Technology, No.579, Qianwangang Road, 266590, Qingdao, China
College of Energy and Mining Engineering, Shandong University of Science and Technology, No.579, Qianwangang Road, 266590, Qingdao, China
Journal of Theoretical and Applied Mechanics 2024;62(1):47-60
KEYWORDS
TOPICS
ABSTRACT
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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