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本文依托中条山特长公路隧道,以隧道洞口小净距段为研究对象,采用有限差分软件FLAC3D,对软弱破碎围岩并行小净距隧道洞口段进行非线性动力时程数值分析,探究爆破震动影响条件下的小净距隧道动力响应特征。研究结果表明:受爆破震动影响,隧道仰拱振速最小,左背爆侧次之,拱顶较大,迎爆侧最大。掌子面后方围岩及衬砌震动要比掌子面前方剧烈。故迎爆侧与拱顶的衬砌结构受力及围岩稳定性在施工中需重点监测。
Based on the Zhongzhangshan special long-distance highway tunnel, taking the small clear distance of the tunnel entrance as the research object, the finite difference software FLAC3D is used to analyze the nonlinear dynamic time-history of the tunnel opening of the weakly- Dynamic response characteristics of small clear distance tunnel under influence conditions. The results show that the influence of blasting vibration is the smallest on the arch of inverted tunnel, the second on the left backburst, the larger on the dome and the largest on the blasting side. Behind the face of the stone face and lining vibration than the front of the fierce face. Therefore, the side of the blasting side and the dome of the lining of the force and stability of surrounding rock in the construction of the need to focus on monitoring.