基于FFT-FS的土密实度瞬态振动测试信号分析  

Signal Analysis of Instant Vibration Testing for Soil Compactness based on FFT-FS Technique

作　　者：靳建明[1] 徐毅青[1] 

机构地区：[1]浙江树人大学城建学院,杭州310015

出　　处：《科技通报》2011年第6期904-907,共4页Bulletin of Science and Technology

基　　金：浙江省自然科学基金项目(Y107710);浙江省教育厅科技计划项目(20071034)

摘　　要：基于杭州地区广泛存在的粉质粘土,进行了大量的试验工作。通过对试验成果的综合分析,提出了基于傅立叶变换的土密实度瞬态振动测试信号分析方法。通过分析,提取信号的主峰频率作为反映土密实度大小的特征参量。分析结果表明:干密度与主峰频率呈正相关的关系;相反,含水量与主峰频率呈负相关的关系。最后利用最小二乘法原理,获得了土密实度与特征参量之间的半经验公式。A lot of laboratory tests,including vibration method and traditional method,are carried out based on clay silt of Hangzhou.By synthesis analysis of test data,the method based Fourier transform is presented to analyze the testing signal of soil compactness.Then,the feature parameters reflecting the value of soil compactness,peak frequency,is extracted.The correlation analysis indicates that the peak frequency has a remarkable positive correlation with dry density and a significant negative correlation with water content.Then,the semi-empirical formulas for soil compactness analysis are presented based on least square algorithm principle.

关 键 词：土密实度 瞬态振动测试 频谱细化分析 快速傅立叶变换 

分 类 号：TU411.8[建筑科学—岩土工程]