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以武(都)罐(子沟)高速公路宋家山隧道为工程背景,基于隧道浅埋、偏压、隧道洞口段穿越滑坡体等工程特点,通过现场实测资料、数值模拟、结合施工方法对初期支护钢拱架和喷混凝土的受力特征进行研究。结果表明该隧道初期支护受力先迅速增加后逐渐减小最后趋于稳定,应力分布规律具有浅埋、偏压隧道初期支护受力的一般特征;深埋侧滑裂面附近初期支护受力特点为:应力高、稳定周期长、剪力大等;仰拱闭合及二衬的施做对抑制滑坡蠕动有很大的作用。研究过程为该隧道的信息化施工提供了保证,同时研究成果也可为设计和分析研究其它同类工程提供参考。
Based on the engineering characteristics of Songjiashan tunnel in Wu (J) tank (Zigou) expressway, based on the engineering features such as shallow burial of tunnel, biasing pressure and crossing of landslide body in tunnel entrance section and so on, through field observation data, numerical simulation and construction method, Supporting steel arch and sprayed concrete stress characteristics were studied. The results show that the initial supporting force of the tunnel firstly increases rapidly and then decreases gradually and finally stabilizes. The stress distribution law has the general characteristics of shallow buried and biased tunnel initial support force. The initial support near the deep buried sliding surface Stress characteristics are: high stress, long stable period, large shearing force, etc. The application of inverted arch closure and secondary lining has a great effect on inhibiting landslide creep. The research process provides a guarantee for the informatization construction of the tunnel, and the research results can also provide reference for the design and analysis of other similar projects.