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结合都汶高速公路董家山隧道小净距段的实际情况,应用数值模拟方法,对小净距段在爆破荷载作用下的相互影响问题进行了研究。结果表明:在隧道爆破施工中,应对迎爆侧进行重点监控,采用合理的开挖和加固方式可有效降低爆破施工对先建隧道的不利影响。研究结论为该隧道小净距段的爆破设计、施工及现场监控量测提供指导,同时,为类似小净距段隧道提供参考。
Combining with the actual situation of Dongjingshan Tunnel in Tuen Mun Expressway, the numerical simulation method was used to study the interaction of small clear distance sections under blasting load. The results show that in tunnel blasting construction, priority monitoring should be carried out on the blast side, and reasonable excavation and reinforcement methods can effectively reduce the adverse impact of blasting construction on the first tunnel construction. The conclusions of the study provide guidance for blasting design, construction and on-site monitoring and measurement of the small clear distance section of the tunnel, and provide reference for similar small clear interval tunnels.