随着我国城市化进程的不断加快,城市道路交通拥堵现象日益严重,轨道交通作为一种方便快捷的交通方式很快成为我国大中型城市基础设施建设的重点和亮点.以近距离斜跨八一、向阳隧道的重庆市轨道三号线为依托工程,提出了采用地中框架桥的新型结构形式近距离斜跨既有隧道的工程方案,并将其与直接跨越结构形式进行对比分析.分析结果表明:采用地中框架桥连续斜跨的结构形式,可以有效控制新旧隧道围岩中塑性区的发展,防止其塑性区贯通而造成围岩失稳,同时可大大减小既有隧道衬砌结构的内力,确保新旧隧道运营安全.%With the acceleration of urbanization in China, the traffic in cities are getting more crowded, as a convenient and fast traffic, rail transportation becomes a focus and highlight of infrastructural construction in big and middle size cities in China. This paper studied Chongqing No. 3 monorail line that close oblique crosses Bayi Tunnel & Xiangyang Tunnel and suggested a project solution to adopt the new structure of earth frame bridge to oblique cross the existing tunnels at short distance, and this form is compared with direct cross over method. The analysis results show that by adopting earth frame bridge continuous oblique cross structure, it may effectively control development of plastic zone in the surrounding rock of old and new tunnels, protect surrounding rock from instability due to penetration of plastic zone, meanwhile, it may greatly reduce inner force of tunnel lining structure, and so to assure safe operation of new & old tunnels.
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