填埋场衬层修补技术中振动信号的STFT分析

Vibration signal analysis of STFT to the landfill medium layer's leaks repair technology

填埋场由层状介质构成且防渗层HDPE膜出现渗漏在所难免,钻探灌浆修补技术是填埋场防渗层漏洞修补的重要发展方向;根据振动信号在垃圾填埋场不同介质中的响应不同,并基于LabVIEW的优点,通过钻探技术,利用LabVIEW软件对采集的填埋场振动信号进行STFT(短时傅里叶变换)分析,进而判断填埋场不同介质层的频谱特征,据此分辨出卵石层,为HDPE膜上漏洞修补做好前期准备;实验结果表明,STFT能够直观,清晰地反映振动信号在不同介质层的频谱特征,能够准确地区分卵石层。

Landfill posed by the layered medium and the impermeable layer of HDPE membrane leakage is unavoidable,drilling grouting repair technology is the important development direction of landfill impermeable layer of bug fixes.According to the different responses of the vibration signal in the different media of landfill site,basing on the advantages of LabVIEW,throughing the drilling,using the LabVIEW software to do STFT for the vibration signal,so as to reflect the frequency domain characteristics of the vibration signals in different dielectric layer,and do preparation for the leaks repair.Experimental results show that：STFT can be intuitively,clearly reflect the vibration signal in different spectral characteristics of dielectric layer,be able to accurately distinguish the gravel layer.