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中文摘要：
双层隧道为解决城市地面交通堵塞问题提供了新思路,但相关的设计、施工方面的探讨较少.以济南市顺河高架南延工程可行性研究为工程依托,在充分调研国内外双层隧道研究现状的基础上,采用M idas/GTS有限元软件建立模型,对双层隧道的结构设计参数进行校核;同时,对双层隧道空间的实现、通风方式进行研究,并提出通过设置港湾式加宽段解决紧急情况下的人员逃生问题.研究结果表明：设计方案理论上是合理可行的,可为解决类似条件下交通拥堵问题提供借鉴.
英文摘要：
As a new structure, the double-decked tunnel provides a new method to solve the traffic jam in the city,but there is little investigation on its design and construction. The article was based on the feasibility research ofthe South Extension Project of the ShunHe Viaduct Bridge. The current research status of the double-decked tunnelat home and abroad was fully surveyed, and the finite element analysis software Midas/GTS was used to evaluatethe tunnel support parameters for their rationality of the design. Meanwhile, this article also put forward how to carryout the idea of the double-decked tunnel in room and ventilation mode, as well as a design plan was provided tosolve some emergency of personnel escape in the fire by setting up widened section bay. The results show the design,which provides reference to other similar engineering projects in the future, is reasonable and feasible.
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