关键词: 公路隧道, 富水断层破碎带, 大跨隧道设计, 快速化施工, 自进式管棚, 突水突泥

Abstract: To successfully cross F7 fault and related secondary fracture zones and realize fast construction of Shixia tunnel, the advance support, primary support, and foot locking anchor bolt are optimized through numerical calculation and field monitoring methods. The recommended measures have achieved good results in engineering application. The practical results reveal the following: (1) The selfpropelled pipe shed integrates drilling, grouting, and support, which enhances the stability of surrounding rock and greatly improves the construction efficiency of advance support. (2) The twobench rapid excavation method under the protection of pipe shed can realize early closure and less disturbance of primary support, and greatly improve the construction progress. (3) The influence law of various angles and lengths of foot locking anchor bolt on crown settlement and peripheral convergence vary, hence, reasonable design parameters should be selected according to the deformation law of surrounding rock and lining. (4) The twobench rapid excavation method under the protection of pipe shed and R51 foot locking anchor bolt can effectively control the stability of surrounding rock and the deformation of primary support.

Key words: highway tunnel, waterrich fracture zone, largespan tunnel design, fast construction, selfpropelled pipe shed, water and mud inrush