偏压地形条件下隧道进洞方案设计

Tunnel Entrance Project Design under Terrain Condition of Eccentric Compression

复杂地形在山区高速公路隧道设计中会经常遇到,由于隧址区本身的地质情况就复杂多变,再加上降水等不利因素对隧道洞口施工的影响,进洞方案往往是几种处理措施的综合体。对周边山体的加固、洞口管棚的设置、开挖方法的选择以及爆破强度的控制等,无不对隧道的安全进洞产生直接影响。因此在浅埋偏压段隧道进洞方案的制定过程中,应灵活运用各种行之有效的方法,努力落实"安全、经济、合理、环保"的设计原则,确保工程顺利实施。

Complex terrain is often met in the expressway tunnel design in mountainous areas. Because the geological condition of tunnel area is complex and volatile and the disadvantages such as rainfall influence the tunnel opening construction, entrance project is usually a synthesis of several measures. The choose of reinforcement of circumjacent mountain, the setting of entrance pipe shed and excavation method, as well as the control of burst strength directly impact the safety of entering tunnels. So, in order to ensure smooth implementation of engineering, various effective measures should be applied flexibly during the entrance project establishment of the shallow-buried section tunnels under the condition of eccentric compression, the design principle of ＂safety, economy, rationality, and environmental-friendliness＂ should be implemented.