偶然性内爆炸作用下盾构隧道的破坏特性分析

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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.

Key words： tunnelling engineering internal explosion shield tunnel segment joint connecting bolt failure characteristics

Received: 26 November 2010

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http://www.rockmech.org/EN/Y2011/V30/IS2/3434

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