微动技术在城市地下病害体探测中的应用研究

Research and Application of Micromotion Technology in the Detection of Urban underground Disease Body

近年来国内城市化进程加速,伴随着频繁的工程活动(道路,地铁,深基坑工程等)与城市地下管线老化等因素影响,城市地下病害体问题日益突显。如何在复杂的城市空间中准确找出地下病害体的分布是地球物理勘探的热点,微动勘探技术作为一种无损勘探对城市地下病害体有较好的探测效果。微动勘探技术的基本原理是将微动信号中提取面波(瑞利波)的频散曲线,通过对频散曲线进行反演,最终通过横波速度的差异来解释地下的结构,本文将微动勘探技术在城市地下病害体工程中应用提取出的地层相关属性(如:H/V(horizontal/vertical)谱比曲线、频散曲线、相速度剖面等)进行综合解释。结果表明,该方法可以有效提高对城市地下病害体探测准确度,而且拥有着经济、快捷、无损等诸多优点。

In recent years,with the acceleration of urbanization in China,with frequent engineering activities(road,subway,deep foundation pit engineering,etc.)and the aging of urban underground pipelines and other factors,the problem of urban underground disease body has become increasingly prominent.How to detect the distribution of underground disease bodies accurately in the complex urban space is the hot spot of geophysical exploration.As a kind of nondestructive exploration,Micromotion exploration technology has a good detection effect on urban underground disease bodies.Its basic principle is to extract the dispersion curve of surface wave(Rayleigh wave)from micro-motion signal,and finally explain the underground structure through the difference of shear wave velocity.In this paper,the stratum-related attributes(such as H/V spectral ratio curve,dispersion curve,phase velocity profile,etc.)extracted from the application of micro-motion exploration technology in urban underground diseases engineering are comprehensively interpreted.The results show that this method can not only effectively improve the detection accuracy of urban underground diseases,but also has many advantages such as being economical,fast and non-destructive.