【摘要】 为了解决地铁车站洞桩法施工中地下空洞区的存在位置,采用了Fourier变换、滤波、小波分析等方法,研究了地下空洞区瑞雷波频散曲线的变化规律。结果表明:经过瑞雷波的频散曲线分析对整个场地地基土体工程地质性质的评价,选取了地下正常和地下有空洞的不同地层进行频散曲线对比,地下空洞区频散曲线图中拐点相当明显,由此确定频散曲线的不协调处为地下空洞区的位置,该方法证明了在浅层地下空洞区探测中的实用性和有效性,具有较好的应用效果和发展前景。更多还原

【Abstract】 In order to identify the location of underground cavity area caused by PBA method,the techniques of Fourier transform,filter and wavelet analysis were used to analyze data obtained.Thus the dispersion curves associated with the underground cavity area were investigated.By applying Rayleigh wave dispersion curves,the geological properties of the entire field of foundation soil can be modeled and the comparison between the dispersion curves of different strata,such as with and without underground cavity areas,can be made.Therefore the location of the underground cavity areas can be identified as the underground cavity area results in an inflection point on the dispersion curves.The study demonstrates the validity and practicability of the method developed for indentifying shallow underground cavity areas.The method will have a wide application.更多还原