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结合交通部示范工程——长(春)深(圳)公路平泉(辽冀界)至承德段高速公路工程,从工程地质、水文条件和隧道衬砌结构的特点、难点出发,探讨隧道环保型设计特点。首先通过调研和隧道使用功能综合分析确定隧道建设标准;然后对分离式、小净距和连拱隧道三种典型的隧道结构型式进行了对比分析,并进行有效的结构型式组合,实现路线选型的自由度和有效地节约土地资源;最后通过优化隧道超前预加固方案实现浅埋偏压段的环保型设计目标。隧道洞门的设计最能直观反映隧道环保型设计的理念,通过洞口地形及结构受力特点确定了明洞式、削竹式和端墙式洞门,并在左、右洞端墙式洞门之间保留山体,确保环境和隧道运营的要求。研究结果对于山区高等级公路隧道环保型设计有一定的借鉴意义。
Combined with the demonstration project of the Ministry of Communications - Changchun (Spring) Shenzhen-Pingquan (Liaoning-Hebei border) to Chengde expressway project, this paper discusses the tunnel-friendly design from the engineering geological and hydrological conditions and the characteristics and difficulties of the tunnel lining structure Features. Firstly, the tunnel construction standards were determined through the comprehensive analysis of research and tunneling functions. Then three typical tunnel structures of separated type, small spacing and multi-arch tunnel were compared and analyzed, and the effective combination of structure types was realized to realize the route selection The degree of freedom and the effective conservation of land resources; Finally, through the optimization of the tunnel advance pre-reinforcement program to achieve environmentally friendly design of shallow bias biased design goals. The design of tunnel gate can most intuitively reflect the concept of environment-friendly design of tunnel. Through the characteristics of the topography and structure of the tunnel, the Ming-dong type, bamboo-cut type and end-wall type gate are determined. Keep the mountain between the doors to ensure environmental and tunnel operation requirements. The research results have certain reference for the environment-friendly design of mountain high-grade highway tunnels.