关键词: 隧道工程, 软弱破碎带, 施工方法, 施工进度

Abstract: Double-side-drift method and three-step method is often used during shallow buried and large span tunnel construction，and they have different influences on the stress and deformation of tunnel structure as well as construction schedule.Therefore，according to the comparison and selection of the construction method of Tongluoshan Tunnel in Chongqing，the elastoplastic D-P failure criterions and numerical simulation method were used to study the stress characteristics and the displacement of tunnel surrounding rock and supporting structure with 2 kinds of construction methods，that is the double-side-drift method and three-step method.And the construction schedule was also analyzed by combining with the field construction flow.The study shows that： the three-bench method adopted in Tongluoshan Tunnel can meet safety requirements in the aspects of controlling surrounding rocks displacement，the range of plastic zone and the stress of supporting structure； moreover，it is more advantageous in construction schedule，cost and process arrangement.The research results available in Tongluoshan Tunnel can provide a theoretical basis and practical experience for the similar engineering construction.

Key words: tunnel engineering, broken rock mass, construction method, construction schedule