地脉动频谱特性在探究场地评价中的应用

Application Study of Micro-Tremor Test in Evaluating Engineering Sites

运用单点谱比法对地脉动频谱特性进行分析,根据频谱类型分类结果给出场地卓越周期建议值。在已有钻孔资料基础上,建立卓越周期与覆盖层厚度间的相关关系,并通过实际的工程数据验证了二者关系式的准确性和普适性。由于地脉动观测具有经济、简单、快捷的优点,可将其运用到不宜进行钻孔勘探的复杂场地,从而为该地区工程场地地震安全评价和地震小区划、场地类别划分、场地选择和评价提供基础资料。

Using the continuous and uniform micro-tremor test, data are collected in Chengxian. We analyze the spectrum characteristics of micro-tremor test data using a single point of spectrum ratio method, then the recommended value of the site predominant period is obtained according to the classification of the spectrum type results. Based on existing drilling data, the correlation between site predominant period and the thickness of the overlay is established. Using the actual engineering data to verify the accuracy and the universality of the relationship. Due to its economy, simplicity and speed, the micro-tremor test provides basic data for the seismic safety evaluation of region engineering sites, earthquake seismic micro-zoning, the categories of site classification, site selection and evaluation.