环保型傍山隧道结构研究

为了保护南京老山二号公路隧道右线傍山段的自然环境，采用锚喷支护与棚洞结构相结合的傍山隧道结构形式，形成互为补充的完整受力体系和边坡防护工程，减小了刷坡范围。通过棚洞顶按一定坡率回填，种植树草，可有效地绿化洞口边仰坡。平面应变弹性数值模拟分析结果表明：该结构的变形与受力是合理的，在安全上均能满足相关技术规范。提出了该结构的合理施工方法。在路线傍山布置地段，构造物应顺应地形，提倡设置棚洞、半隧道，以达到保护边坡和自然环境的目的。

Research on Environmental Friendly Structure of Tunnel Adjacent to Mountain

In order to protect the natural environment of the zone adjacent to mountain of right No. 2 Laoshan Highway Tunnel in Nanjing, China, the design of shed-tunnel was adopted through economical and technical comparison. Combining anchor-shotcrete with shed-tunnel structure, a reasonable and complete supporting system of the slope was formed, and the excavation scope of slope reduced significantly. The FEM elastic simulation results of plane strain show that the deformation and stress distribution of this structure are safe and accord with the relevant standard of highway tunnel. The reasonable construction method of this structure was provided also. The structure which is adopted according to the natural topography, such as shedtunnel or half-tunnel, should be adopted to protect the natural environment and slope in the complicated zone adjacent to mountain.