浅埋傍山隧道开挖方式对边坡扰动数值分析

Numerical analysis of slope disturbance by excavation method of shallow buried hill tunnel

通过分析大断面隧道开挖常用的台阶法、CD法、CRD法和双侧壁导坑法的特点,提出如何选用合理的开挖方式以减小对边坡的扰动。结果表明:浅埋傍山隧道与普通隧道变形存在较大差异,坡顶下沉显著增大,水平收敛较小,变形监测应以坡顶下沉为主。据此,为傍山隧道设计和施工方法的选择提供理论依据。

This paper analyzes the characteristics of step method, CD method, CRD method and double sidewall guide pit method commonly used in large section tunnel excavation. How-to choose reasonable excavation method to reduce the disturbance of slope is proposed. The results show that the deformation of shallow- buried mountainside tunnel is different from that of normal tunnel tunnel, and the slope top subsidence is signifi- cantly increased with less horizontal convergence. Therefore, it provides a theoretical basis for the design and construction methods of the tunnel.