【摘要】 介绍了地脉动的原理、测试方法及其影响因素,通过工程实例,阐述了场地卓越周期的测定及其在场地及场地土判定与评价中的应用,分析了不同场地条件对地脉动频谱特性的影响。结果表明通过地脉动测试确定场地卓越周期的效果较为理想,其在场地及场地土判定与评价中的结果与利用剪切波速和覆盖层厚度划分结果基本一致;场地岩土层结构直接影响地脉动的频谱特性,二者的变化相对应。更多还原

【Abstract】 The principle,test method and causes of ground microtremors are introduced.According to engineering examples,the determination for the predominant period of a site is described,as well as its application in evaluation for the category of the site and soil,and the effect of different site conditions on the characteristics of frequency spectrum are analyzed.The results are shown that there is a good result for determinating the predominant period through ground microtremor testing,and the conclusion derived by the predominant period in the evaluation of the site and soil is similar to that by the equivalent shear wave and the thickness of overburden layer.The rock and soil structure markly affect the frequency spectra of the ground microtremors,and the corresponding relationships between them are existed.更多还原