高陡边坡环境下隧道斜交洞口工程关键技术

Key Technology of Tunnel Oblique Portal Engineering under High and Steep Slope Environment

摘要:

以绍兴市群贤路西延萧山南秀路二期工程礼陀山隧道出口为例，针对高陡边仰坡隧道洞口的设计和施工难题，对落石风险较大的斜交洞口进行主动及被动复合防护、加长部分明洞段等措施，有效地保障了隧道洞口的边坡稳定性。同时，超前管棚、超前小导管等进洞加强措施确保了洞口段的施工安全，也进一步起到了加固洞口边坡、稳定坡面和进洞施工安全的作用。实践证明，所采取的一系列措施有效保障了群贤路隧道斜交进洞施工的顺利进行。群贤路隧道高陡边坡斜交进洞的顺利实施，是类似工程设计和施工的成功范例。

Abstract:

Taking the Liduo Mountain Tunnel Exit of the Shaoxing Qunxian Road West Expansion Xiaoshan Nanxiu Road Phase II Project as an example, aiming at the difficulties in the design and construction of tunnel portal on the high and steep side face upward slope, the measures of active and passive composite protection for the oblique portals with a relatively high risk of rockfall, and extending the partial open tunnel section are taken to effectively ensure the stability of the side slopes at the tunnel portal. At the same time, the advanced pipe sheds, advanced small conduits and other strengthening measures for entering the tunnel are taken to ensure the construction safety of tunnel portal section, and also further play a role in reinforcing the slope of the tunnel portal, stabilizing the slope surface and ensuring the safety of construction entering the tunnel. The practice has proven that a series of taken measures have successfully guaranteed the smooth construction of the oblique portal of Xianxiu Road Tunnel. The successful implementation of the high and steep side slope oblique tunnel portal of Qunxian Road Tunnel is a successful example for the design and construction of similar projects.