近三十年来，国内采用盾构法修建了大量的城市公共交通隧道并已投入使用，现代城市中公共交通隧道已成为人们工作和生活中的重要公共活动场所，这些场所的防爆减灾问题愈益受到重视。本项目拟针对重要的城市交通隧道口部或内部发生意外或恐怖爆炸情况下的安全评估和防爆技术问题，研究爆炸对隧道口部和内部产生的破坏效应，比较分析不同出入口布置方式和不同结构形式的隧道口部的抗爆特性，研究爆炸冲击波与口部地形、边坡、不同坡度的道面等的动力相互作用，着重针对构筑在土中采用管片装配而成的城市盾构隧道的组合结构特点，研究在内部爆炸作用下盾构隧道连接薄弱部位的动态响应特性和灾变机理，提出爆炸冲击波在隧道内的传播规律和荷载计算方法，建立考虑管片-管片、管片-螺栓及管片与周围土体动力相互作用的隧道爆炸响应分析方法，研究爆炸荷载作用下周围土体对盾构隧道抗爆特性的影响，提出评估隧道爆炸安全性的方法和防爆对策。

In recent more than thirty years, a great number of tunnels for public transport in urban districts are built based on shieled-driven tunneling and in use in China. The tunnels play importtant roles in modern city and have become public places that have close relations to people's life and activities,which highlights the importance to resist explosion disaster from accidental explosions or terrorist blast attacts for the tunnels.The proposal is about investigation on safety assessment and explosion mitigation technologes of the tunnels under accidental explosions or terrorist blast attacks, which consists of follwing topics:(1) failure effects of entrance of the tunnel for public transport in urban districts induced by explosion;(2)comparison study of blast-resistant characteristics of the entrance of different branch exit arrangement and different structures; (3)dynamic interaction between explosion-induced shock wave and features of the entrance such as terrain,slope etc.;(4)the failure mechanism and dynamic characteristics of a prefabricated assembly shield tunnel composed of segments by means of bolts under internal explosion;(5)the propagation characteristic of shock wave in the shield tunnel and calculation method of explosion-induced load inside the tunnel; (6)the three- dimensional FEM model for analysis of dynamic response of shield tunnel under internal explosion loading ,which can model the contact effects of segment-segment，segment-bolt and segment-soil;(7)the method to assess safety of public transport tunnels in urban districts under explosion and protective technologies to mitigate explosion disaster for the tunnels.