双圆盾构隧道在内部爆炸荷载下的响应分析

摘要：以双圆断面为代表的新型断面隧道结构在软土地铁网络建设中逐渐增多，其在内部爆炸荷载下的动力特性尚未有研究。以软土地区双圆盾构隧道结构为对象，采用动力有限元方法分析了其与炸药接触和非接触两种状态下各5种当量炸药爆炸后的动力响应，得出各工况下隧道结构的最终应力状态，其结果表明隧道结构与炸药接触时，5种工况下隧道结构都有不同程度的损坏，其破坏程度依次增强；隧道结构与炸药非接触时，5kg、10kg、20kg当量炸药爆炸后对隧道结构基本没有影响，而50kg、100kg当量炸药爆炸后隧道结构已严重的损坏。该结果对软土地铁隧道运营安全管理具有参考价值。

Response Analysis of Dot Shield Tunnels Under Internal Explosion

Abstract: Dot shield tunnels as a new cross-section of tunnels gradually increased in soft metro subway networks, but their dynamic behavior under internal explosion have not jet studied. Based on dynamic finite element method, the paper analyzed dynamic behavior of dot shield tunnels under the condition of contact and non-contact explosive including each 5 kinds of explosive charge, obtained stress state of dot shield tunnels under 5 loading conditions. Analysis results show that different degree damage of tunnels occurred under the condition of contact and the damage increased with the explosive charge increasing, no damage occurred under the condition of non-contact including 5kg, 10kg and 20kg explosive charge, serious damage occurred under the condition of non-contact including 50kg and 100kg explosive charge. So the result has reference value for safe operation of metro subway.