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在隧道穿过结构物、建筑群、大跨度或大框架结构物,同时受到围岩级别、场地等客观条件限制,不具备机械开挖或无振动开挖条件时,可以通过采用合理的微震控制爆破参数、监控量测、振动安全监测、沉降预控等手段,选择既符合振速要求又能满足施工安全的微震控制爆破实施方案。以在建的北庄隧道(下穿村庄)复杂环境下采用微震控制爆破为实例编制,通过科学的验算和监控手段来指导和调整微震控制爆破参数。
When tunnels pass through structures, buildings, long-span or large-frame structures and are subject to the objective conditions such as the grade and site of surrounding rock and the conditions of excavation without mechanical vibration or vibration without excavation, reasonable microseismic control Blasting parameters, monitoring and measuring, vibration safety monitoring and settlement pre-control and so on, the microseismic control blasting scheme which meets the vibration speed requirements and meets the construction safety is selected. Taking the microseismic control blasting as an example in the complicated environment of the Beizhuang tunnel under construction (under the village), the parameters of microseismic control blasting are guided and adjusted through scientific checking and monitoring methods.