爆炸参量对爆破地震反应谱的影响

Influence of explosion parameters on response spectrum for blast ground vibration

利用在地震工程中广泛应用的反应谱理论对爆破地震效应进行研究。根据单自由度体系反应谱理论,采用计算量少、精确度高的三角插值解析公式法取代常用的分段线性插值法进行反应谱数值计算。结合大量工程爆破地震监测资料,对不同爆炸参量下产生的爆破振动信号进行反应谱分析。结果表明,结构体对爆破震动的响应特征与爆炸参量有着密切的关系。为综合研究爆破机理和爆破地震波,特别是为将来构建爆破振动速度 频率相关安全准则提供了一种实用的分析技术。

Blast seismic effect was studied by means of response spectrum applied largely in earthquake engineering. Based on response spectrum of the system with one degree of freedom, response spectrum is calculated. The analytical expression of trigonometric interpolation with great efficiency and high precision is used in the calculation instead of the segmented linear interpolation. According to the monitoring data obtained from engineering blast the blast vibration signals with different explosion parameters are analyzed by response spectrum. The results show that the characteristics of the structure response to blast vibration have close relation to the explosion parameters. The method provides an effective tool for studying blast seismic effect, specially, for constituting velocity-frequency criteria.