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为了研究地表爆破对下方已通车大跨度隧道的影响,结合福州大学阳光学院新区建设爆破实例,采用三维动力有限元数值模拟方法,通过调整地表爆破荷载,分析下方高速公路马尾隧道二次衬砌的在3种不同工况下的爆破振速及应力分布规律。经过计算分析,针对不同区段提出了衬砌受力最不利的位置以及建议的施工爆破振动的控制值,对实际爆破施工及隧道监控有指导意义,也可作为类似工程的借鉴。
In order to study the effect of surface blasting on the long-span tunnel that has been opened to the bottom of the tunnel, combined with the example of blasting construction in the new district of Sunshine Institute of Fuzhou University, three-dimensional dynamic finite element numerical simulation method was adopted to adjust the surface blasting load. Blasting Vibration Velocity and Stress Distribution in Three Different Operating Conditions. After calculation and analysis, the most unfavorable position of lining and the proposed control value of construction blasting vibration are put forward for different sections, which have guiding significance for actual blasting construction and tunnel monitoring, and can be used as reference for similar projects.