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开展了天井山隧道开挖爆破振动现场监测试验,在邻近隧道监测到的最大振动速度分别为0.11m/s和0.10m/s,其最大振动方向为垂直于隧道临空面的径向。监测结果表明,天井山隧道当前爆破开挖对邻近隧道的影响较小,可以保证邻近隧道的安全与稳定;研究表明,开挖爆破应力波在软弱破碎围岩中的传播明显受到削弱,设计规范偏于保守,施工中应因地制宜,在加强观测、保证安全的前提下,提高施工效率。
The on-site monitoring test of blasting vibration of tunnel at Tianjing Mountain was carried out. The maximum vibration velocities monitored at adjacent tunnels were 0.11m / s and 0.10m / s, respectively. The maximum vibration direction was perpendicular to the radial plane of the tunnel. The monitoring results show that the current blasting excavation of the tunnel in Tian Shan has less impact on adjacent tunnels and can ensure the safety and stability of adjacent tunnels. Studies have shown that the propagation of blasting blasting waves in weak and fragmented surrounding rock is obviously weakened. The design code On the precondition of strengthening observation and ensuring safety, the construction efficiency should be improved.