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针对大断面隧道洞口偏压段落施工时围岩稳定性差的工程问题,通过采用数值模拟手段,对比分析不同边坡条件下隧道开挖工法和开挖顺序对边坡稳定性的影响,结果表明:对于开挖偏压段大断面隧道不建议采用台阶法开挖,坡度较小时建议采用CRD法或CD法,坡度较大时建议采用双侧壁导坑法施工;分步开挖隧道时,应先开挖靠近边坡坡面侧的导洞。研究成果可以为大断面隧道洞口偏压段施工方法制定提供理论依据与参考。
Aiming at the engineering problems of poor stability of surrounding rock during the construction of large cross-section tunnel openings, the influence of tunnel excavation method and excavation sequence on slope stability is analyzed by numerical simulation. The results show that: It is not recommended to excavate the large-section tunnel with bias section by step method. When the slope is small, it is recommended to use CRD method or CD method. When the slope is large, it is recommended to use double-side wall pilot method. When excavating tunnel step by step, First excavate the guide hole near the slope side. The research results can provide theoretical basis and reference for the construction of large cross-section tunnel entrance biased section construction method.