市内复杂环境下大药量爆破降振及振动监测分析的研究

在周边高楼林立，人员密集，车流量大的环境下进行地基与地下车库大爆破开挖，对周边建筑进行爆破振动实时监控，并对所监测的振动数据进行分析。发现：爆区周边各测点峰值较小（小于1cm/s），不会对周边结构造成危害；同等水平高度下，东西方向（纵向）测点各相关量（爆破振动峰值、持时、主频和信号能量）均高于南北方向（横向）测点各相关量；纵向测点频谱能量分布比横向测点频谱能量分布更为集中，各测点竖直向振动信号能量主要集中在3.90625-62.5Hz范围内。爆破振动在高楼楼层之间传播时，随着楼层高度的增加，竖直向爆破振动峰值和信号响应能量增大，信号频谱能量分布更加集中，顶层振动峰值约为底层振动峰值的2倍，顶层信号响应能量约为底层信号响应能量的3倍

Big charge blasting vibration damping and vibration monitoring analysis under intracity complicated environment

With background of a garden building foundation and an underground garage excavation blasting,several vibration damping technologies were adopted to actualize large blasting excavation in a city.Blasting vibration was real-timely monitored with instruments,and vibration data was analyzed.It was found that the vibration peak of the monitored points around the blasting zone is too small(less than 1cm/s) to cause damages of surrounding structures;the vibration peak,and signal energy time of the fore-and-aft monitored points are larger than those of the transverse monitored points,the frequency spectral energy distribution of the former is more concentrated than that of the latter;the vertical vibration signal frequency spectral energy of the monitored points concentrates between 3.90625Hz and 62.5Hz;when the blasting vibration propagates between floors in a high building,the vertical blasting vibration peak and response signal energy increase with increase in height,and the response frequency spectral energy distribution is more concentrated,the vibration peak on the top floor is about two times of that on the bottom,the response signal energy on the top floor is about three times of that on the bottom.