基于HHT方法的砖混建筑爆破影响参数研究

Study on Impacted Parameters of Blasting Vibration on Brick Concrete Structure Based on HHT Method

为研究隧洞爆破振动对邻近砖混建筑的影响,利用海南某引水隧洞现场爆破参数进行数值模拟和原位测试,结果表明在爆破影响范围内,爆破点距建筑物水平距离越近,各楼层振速差越小;同时,根据实地采集爆破振动信号,使用HHT(Hilbert-Huang Transform)分析方法进行振动响应分析,获得了最大瞬时振动能量幅值;通过对能量幅值的研究,表明分区爆破开挖是减振的关键,并得出砖混建筑的安全爆破能量幅值为0.021 m^2/s^2。

In order to study the influence of blasting vibration of tunnel on adjacent brick-concrete buildings,numerical simulation and in-situ test are carried out using parameters of a tunnel in Hainan.The results show that within the blasting influence range,the closer the blasting point is to the horizontal distance of the building,the smaller the difference of vibration velocity of each floor is;HHT(Hilbert-Huang Transform)analysis method is used to analyze the original signal.Through analysis,the maximum instantaneous vibration energy amplitude is obtained;through the study of the energy amplitude,it is shown that the key of vibration reduction is excavation by blasting in different zones,and the safe blasting energy amplitude of brick-concrete buildings is 0.021 m^2/s^2.