To study the impact of blasting construction of double-layer superimposed primary support arch cover method, relying on the station construction project of Dalian Metro Line 5, the disturbance of blasting on high-rise buildings, surrounding strata, adjacent pilot tunnels and the arch structure is analyzed based on numerical simulation and field monitoring results. At the same time, research is carried out on the blasting excavation footage of pilot tunnels. The results show that there will be a certain “elevation amplification effect” (EAE) on high-rise buildings during the blasting construction using the method. The peak particle velocity (PPV) of adjacent tunnels decreases gradually with the increase of the distance from the explosion centers. For the adjacent pilot tunnel, the main influence area is within the range of − 5 to 5 m from the pilot tunnel face. For adjacent buildings, the main influence stage is within the range of − 2 to 2 m from the pilot tunnel face. Blasting operations significantly intensify the plastic yield of surrounding rocks around the station. Blasting excavation footage can be used as the optimization parameter in the construction process, and the blasting excavation footage of pilot tunnel 4 can be adjusted from 1.0 to 1.5 m. The formation of the arch structure composed of double-layer superimposed primary support and secondary lining effectively reduces the impact of rock blasting on the whole station and high-rise buildings.

为研究双层叠加初支拱盖法爆破施工影响，依托大连地铁5号线车站建设工程，爆破对高层建筑、周边地层、邻近先导隧道及拱结构的扰动根据数值模拟和现场监测结果进行分析。同时，对先导隧道爆破开挖进尺进行了研究。结果表明，采用该方法进行爆破施工时，会对高层建筑产生一定的“高程放大效应”（EAE）。相邻隧道的峰值粒子速度（PPV）随着距爆炸中心距离的增加而逐渐减小。对于邻近的先导隧道，主要影响区域为距先导隧道掌子面-5～5m范围内。对于邻近建筑物，主要影响阶段在距先导隧道掌子面−2～2m范围内。爆破作业显着增强了车站周围岩石的塑性产量。施工过程中可采用爆破开挖进尺作为优化参数，4号先导隧道爆破开挖进尺可在1.0～1.5m范围内调整。双层叠加一次支护和二次衬砌组成的拱形结构的形成，有效减少了岩石爆破对全站及高层建筑的影响。