Failure behaviors of cracked tunnel under impact from different loading orientations

被引：0
|
作者：
Zhou L. [1 ,2 ]
Zhu Z. [1 ,2 ]
Fan Y. [1 ,2 ]
Liu R. [1 ,2 ]
Deng S. [1 ,2 ]
Dong Y. [1 ,2 ]
机构：
[1] Key Laboratory of Deep Underground Science and Engineering of Ministry of Education, Sichuan University, Chengdu
[2] College of Architecture and Environment, Sichuan University, Chengdu
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Crack initiation time; Dynamic initiation toughness; Failure mode; Impact loading direction; Mixed-mode crack; Tunnel;
D O I：
10.11817/j.issn.1672-7207.2019.08.020
中图分类号：
学科分类号：
摘要：
In order to investigate the effect of different impact loading orientations on the failure patterns of surrounding rock mass of cracked tunnel, green sandstone was chosen as the experimental material to simulate the tunnel, and impact experiments were conducted. A crack emanating from tunnel roof was set as the model to simulate the natural crack around a tunnel, and then the drop weight testing machine was used as the loading device. In the process of dynamic loading test, strain gauges were applied to determine crack initiation time and crack propagation velocity, and then corresponding numerical simulation were carried out. The properties of crack propagation and the failure mode of tunnel model were obtained. Finally, the numerical results were compared with the test results. The results show that when the impact loads come from the tunnel roof, the failure of the tunnel mainly includes crack initiation and propagation, and tensile failure of the tunnel bottom. When the impact loads come from the sidewall, the failure of the tunnel occurs at the arch shoulder of two sides. The dynamic initiation toughness of the pre-crack in the surrounding rock mass is greatly related to the impact loading direction. Under the same impact loading, the stress of the arch shoulder and arch foot of tunnel are larger than that of other regions, the arch shoulder and arch foot are liable to tensile failure, and the dynamic stability is relatively low. © 2019, Central South University Press. All right reserved.
引用
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页码：1921 / 1929
页数：8
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