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采用FLAC3D建立软弱围岩隧道模型,通过对比多种工况下的隧道支护效果,提出由超前支护和“钢架+钢筋网+两翼锚杆+喷射混凝土+锁脚锚杆+纵向连接筋”组成的初期支护形成联合支护结构。取消拱部范围系统锚杆,不仅未影响隧道围岩稳定,而且可以缩短了工序循环时间,有利于及早封闭围岩以形成完整的支护结构,具有一定的经济效益和社会效益。
By using FLAC3D to establish the tunnel model of weak surrounding rock, by comparing the effect of tunnel support under various working conditions, it is proposed that the advanced support and the steel frame + steel mesh + two wings anchor + shotcrete + foot anchor + vertical connection Tendons "composed of the initial support to form a joint support structure. Removing the bolt system of the arch area not only does not affect the stability of the surrounding rock of the tunnel, but also shortens the process cycle time and facilitates the early closure of the surrounding rock to form a complete supporting structure with certain economic and social benefits.