长周期地脉动观测在深部地层调查中的应用  

Application in Deep Stratum of Soil Investigation Using Long-Period Microtremor

作　　者：于凯[1] 车爱兰[1] 冯少孔 杉山长志 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]中央开发株式会社

出　　处：《上海交通大学学报》2011年第5期701-705,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(40974070);上海市重点学科建设项目资助(B208)

摘　　要：对上海软土地区的长周期地脉动信号进行观测,采用傅里叶频谱分析及微动水平与垂直速度分量（H/V）频谱分析相关理论,分析地脉动信号的频谱稳定性及卓越频率的空间变化规律,通过反演分析得到沉积土层厚度及其横向变化规律,并与已知钻孔资料加以对比.结果表明：适宜在上海地区深入展开长周期地脉动测试,其长周期地脉动信号稳定;H/V频谱曲线峰值显著,并且在长周期范围内呈现出规律性的变化特征;上海地区软土层厚度为200~300 m.The long period microtremor observation was performed on soft soil area in Shanghai city.The FFT spectrum analysis and H/V method were used to evaluate the spatial variations of long period microtremor and its spectrum stability and clarify the depth of deposits and its horizontal distributions.Comparing the inversion results with the known borehole data,the signal of long period microtremor is good and it is very appropriate to deeply expand the investigations in Shanghai city,the signal of microtrmor in the long period area is steady;the peak of H/V spectrum is obvious and shows regular variation characteristic which reveals the depth of soil in Shanghai city is between 200 m and 300 m.

关 键 词：长周期 地脉动 观测 水平与垂直频谱分析 

分 类 号：TU435[建筑科学—岩土工程]