地铁隧道爆破开挖对高层框架结构的动态响应

Caused Dynamic Response of High Rise Frame Structure by Blasting Excavation of Subway Tunnel

针对城市地铁建设过程中隧道爆破对高层建筑物带来的不利影响,基于萨道夫斯基公式,对现场爆破振动测试与有限元模拟对比分析,现场测试结果与计算结果吻合较好。以框架结构垂向振速为研究对象,采用动力有限元方法对高层框架结构在爆破地震波作用下的响应规律进行了研究,并分析了并行隧道不同开挖工况下高层框架结构不同响应特点。计算结果表明:高层框架结构在爆破地震波影响下存在明显高层放大效应放大倍数最大达3.48倍;地铁隧道已开挖段对高层结构振动有空腔放大效应,空腔放大效应的主要影响因素有框架结构与隧道的间距、已开挖隧道空腔相对爆源位置等,前者影响更显著。

Focus on the adverse effects of tunnel blasting on high-rise buildings in the process of urban subway construction, based on the Sardowski formula, the field blasting vibration test and finite element simulation are com- pared and analyzed, and the field test results are in good agreement with the calculated results;Taking the vertical vi- bration velocity of frame structure as the research object, the dynamic response finite element method is applied to study the response rule of high-rise frame structure under the impact of blasting seismic wave, alongwith the different response characteristics of parallel tunnel under different excavation conditions. The result of numerical simulation shows that,obvious amplification effect was found in the high-rise buildings, the maximum magnification is 3.48 ; what＇s more, excavation section of subway tunnel has cavity amplification effect on the vibration of a high rise struc- ture;main influence factors of cavity amplification are distance between building and tunnel, the relative location of cavity in excavated tunnel from to explosion source etc. and the effect of former one is more significant.