Study on radical crack initiation and propagation behavior around roadway under dynamic loading

被引：0
|
作者：
Zhou L. [1 ]
Zhu Z. [1 ]
Dong Y. [1 ]
Ying P. [1 ]
Wang L. [1 ]
机构：
[1] MOE Key Laboratory of Deep Underground Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu, 610065, Sichuan
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 02期
关键词：
Crack inclination; Dynamic initiation toughness; Dynamic propagation; Impact loads; Mixed-mode crack; Roadway;
D O I：
10.13545/j.cnki.jmse.2019.02.006
中图分类号：
学科分类号：
摘要：
In order to clearly investigate the mechanism of radical crack around roadway under dynamic loading, the horseshoe-shaped sandstone roadway model was made and experimentally tested by the drop-hammer impact testing machine. In the test, the pre-crack inclination angle θ ranges from 0º to 90º. The crack-initiation moment and propagation speed, as well as the arrest phenomenon in crack propagation path and the crack-initiation toughness were determined by using the crack propagation gauge (CPG) and strain gauge measuring system. Meanwhile, corresponding numerical simulation was carried out. Results showed that the behavior of I/II mixed mode crack is related to the crack-initiation toughness of mode I and mode II. It is also affected by the crack angle θ. Big differences in crack-initiation toughness of mode I exist between dynamic loads and quasi-static loads. The initiation direction of mode I crack is same to that of original crack, during which, crack arrest exists. There is an angle between the mixed mode I/II crack and original crack, the former forms a wing crack. Finally it propagates along the middle area of the roadway's symmetrical axis. Under the dynamic loads and static loads, the fracture behaviors of two side walls were very different. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：256 / 264
页数：8
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