爆炸波土层动力响应对比分析
Comparative Analysis of Dynamic Responses ofSoil Layers under Blast Wave

以人工爆炸波为震源，通过现场测试获取基岩及土层的地震动参数，并采用等效线性化分析方法计算相应的地震动参数用于与实测结果进行对比分析。峰值加速度对比结果表明，等效线性化分析方法对于Ⅱ类场地的适应性较好，计算结果与实测结果非常接近，而Ⅲ类场地的计算结果与实测值之间存在较大的误差。加速度反应谱的对比结果表明，无论是计算结果还是实测记录，加速度反应谱的峰值均比基岩输入的要大，且土层反应计算的结果小于实际记录；加速度反应谱的宽度与场地类别关系密切，Ⅲ类场地明显比Ⅱ类场地要大，两类场地的计算结果也均小于实测值。
The ground motion parameters of bedrock and soils were acquired by field experiments, using an artificial blast wave as the seismic source. Field drilling was conducted and the corresponding data was obtained, and then, the seismic response analysis was carried out by equivalent linearization. The rationality of the conclusion is discussed through comparisons between the calculated and measured values. The peak acceleration comparison results show that the equivalent linearization method is better for class Ⅱ sites, and the calculated values of surface peak acceleration match well with the measured values. For class Ⅲ sites, there are relatively large discrepancies between the calculated and measured values, which vary with the overburden thickness. According to the comparison results of acceleration response spectrum, both the calculated and measured values of peak ground acceleration response spectrum are larger than those of bedrock input, and the measured values are greater than the calculated values. The width of the acceleration response spectrum is closely related to the site category, and the width of the acceleration response spectrum of class Ⅲ site is significantly larger than that of class Ⅱ site; moreover, the measured values of the two types of sites are both larger than the calculated values