摘要
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
Abstract
With the background of one garden building foundation and underground garage excavation blasting, several of vibration damping technologies were adopted to actualize large blasting excavation in city, blasting vibration was real-timely monitored by instrument, and vibration data was analyzed. Finding that the vibration peak of the monitor points around blasting zone was too small (less than 1cm/s) to cause damage for surrounding structure. The vibration peak, main frequency and duration time in fore-and-aft monitoring points was more than one in transverse, the frequency spectrum energy distribution in fore-and-aft monitoring points was more centralized than one in transverse, The vertical signal frequency spectrum energy of the monitoring points were centralized between 7.8125 and 62.5Hz. with the increase of height when the blasting vibration propagate between floors in high buildings, the vertical blasting vibration peak and signal response energy increased, and the frequency spectrum energy distribution was more centralized, the vibration peak on the top floor was about two times than one on the bottom,the signal energy on the top floor is about three times than that on the bottom of buildings.
关键词
爆炸力学 /
降振技术 /
振动分析 /
振动峰值 /
主频 /
持时 /
高楼放大效应
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Key words
mechanics of explosion /
vibration damping technology /
vibration analysis /
vibration peak/main frequency/duration time /
high building amplification effect
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蒋耀港;沈兆武;杨昌德.
市内复杂环境下大药量爆破降振及振动监测分析的研究[J]. 振动与冲击, 2012, 31(1): 156-161
JIANG Yao-gang;SHEN Zhao-wu;YANG Chang-de.
Study of big charge blasting damping and monitoring under intracity complicated environment[J]. Journal of Vibration and Shock, 2012, 31(1): 156-161
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脚注
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