Influence of blasting load directions on tunnel stability in fractured rock mass

被引：33
作者：
Li, Xiaohan [1 ]
Zhu, Zheming [1 ]
Wang, Meng [1 ]
Shu, Yun [1 ]
Deng, Shuai [1 ]
Xiao, Dingjun [2 ]
机构：
[1] Sichuan Univ, Coll Architecture & Environm, Key Lab Deep Underground Sci & Engn, Minist Educ, Chengdu 610065, Peoples R China
[2] Southwest Univ Sci & Technol, Shock & Vibrat Engn Mat & Struct Key Lab Sichuan, Mianyang 621010, Sichuan, Peoples R China
来源：
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING | 2022年 / 14卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Blasting; Tunnel stability; Crack propagation; Failure mode; Numerical simulation; NUMERICAL-SIMULATION; DYNAMIC-RESPONSE; DAMAGE; ROCKBURST; EXCAVATION; MECHANISM; IMPACT; EVOLUTION; BEHAVIOR; CRACKS;
D O I：
10.1016/j.jrmge.2021.06.010
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
Tunnels in fractured rock masses are typically damaged by dynamic disturbances from various directions. To investigate the influence of blasting load directions on the stability of a tunnel with a pre-crack nearby, blasting tests were conducted on the physical models of an external crack around a tunnel (ECT) in this study. Failure modes of the tunnels were analysed based on stress wave theory. The Riedel-Hiermaier-Thoma (RHT) material model was employed to perform the numerical simulations on ECT models. Stress distribution around the tunnels and final failure patterns of the tunnels were characterised. The results show that, under blasting loads, the pre-crack propagates and then new cracks initiates on the incident side of the tunnel. These cracks extend towards each other and eventually coalesce. Blasting load directions significantly influence the ultimate failure mode of the tunnel in the fractured rock masses. The new cracks on the shadow side of the tunnel appear at different positions when the blasting stress waves come from various directions. The results are meaningful to the analysis of tunnel stability and optimisation of the tunnel support scheme. (C) 2022 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V.
引用
收藏
页码：346 / 365
页数：20
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