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分岔隧道是在我国交通建设中出现的一种新型结构隧道形式,通常是由明洞、大拱段、连拱段和小净距段等5部分组成,同时具备大跨度隧道、连拱隧道和小净距隧道的受力特点,施工过程中受力状态极为复杂。采用有限元计算软件对某分岔隧道施工过程进行建模分析,得出了隧道施工过程中围岩与隧道的变形、围岩的应力状态、初期支护喷射混凝土和锚杆的应力状态。通过对所得到的数值模拟结果进行分析,得出了施工过程中分岔隧道中夹围岩应力较大,应该对其进行加固处理;各分段交界面处应力集中明显,应当对其加强监测等结论。
The bifurcation tunnel is a new type of structural tunnel that appears in the traffic construction of our country. It usually consists of five parts, ie, Myeongdong, large arch section, even arch section and small clear distance section, and has long-span tunnels and even arch tunnels And the small distance tunnel stress characteristics, the construction process of the state of stress is extremely complicated. The finite element analysis software was used to analyze the construction process of a fork tunnel. The deformation of surrounding rock and tunnel, the stress state of surrounding rock, the initial stress state of shotcrete and bolt during tunnel construction were obtained. Through the analysis of the numerical simulation results obtained, it is concluded that the stress of the surrounding rock in the bifurcated tunnel during construction is relatively large and should be reinforced. The stress concentration at the interface of each section should be obviously strengthened. Other conclusions.