ANALYSIS ON FAILURE CHARACTERISTICS OF SHIELD TUNNEL UNDER ACCIDENTALLY INTERNAL EXPLOSION LOADING
WU Yubin1,TIAN Zhimin1,2,LUO Qifeng3
(1. Institute of Engineering Mechanics,China Earthquake Administration,Harbin,Heilongjiang 150080,China;
2. The Forth Engineer Scientific Research Institute of the Headquarters of the General Staff,Beijing 100850,China;
3. Shanghai Institute of Disaster Prevention and Rescue,Tongji University,Shanghai 200092,China)
Abstract:In order to meet the needs of design of prefabricated assembly shield tunnel under explosion,A three- dimensional FEM model for analysis of dynamic response of shield tunnel under internal explosion loading is proposed,which can model the contact effects of segment-segment,segment-bolt and segment-soil. Taking typical metro running shield tunnel as an example,the failure mechanism and dynamic characteristics of the tunnel under internal explosion loading are analyzed. Comparison study of the blast-resistant characteristics between shield tunnel and integral cast in-situ tunnel is conducted,the failure characteristics of segment and bolt are revealed based on calculation results. Example analysis results show that blast-resistant characteristics of shield tunnel is inferior to that of integral cast in-situ tunnel,segment joint is the frail part of shield tunnel to resist internal explosion loading and enhancing bolt strength and tenacity can improve the blast-resistant characteristics of shield tunnel.
田志敏,邬玉斌,罗奇峰. 隧道内爆炸冲击波传播特性及爆炸荷载分布规律研究[J]. 振动与冲击,2011,30(1):21-26.(TIAN Zhimin,WU Yubin,LUO Qifeng. Characteristics of in-tunnel explosion- induced air shock wave and distribution law of reflected shock wave load[J]. Journal of Vibration and Shock,2011,30(1):21-26.(in Chinese)
[2]
TIAN Z M,WU Y B,ZHANG X B,et al. Study on propagation of in-tunnel explosion induced air shock wave and distribution of blast load on inner surface of the tunnel[C]// Proceedings of the 8th International Conference on Shock and Impact Loads on Structures. Adelaide,Australia:[s.n.],2009:659-667.
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