瞬态瑞雷波在工程勘察中的应用

Application of Transient Rayleigh Wave Method to the Building Geological Survey

利用瑞雷面波的频散特性,在地表科学、快速、准确地测试出有效地质信息是可行的一种方法手段。本文介绍了以实测瞬态瑞雷波数据为基础,通过采用遗传算法全局非线性反演处理,对比钻探获取的地质信息,凸显了瑞雷波在工程勘察中查明地层速度、覆盖层厚度及重要地质现象(充填型溶洞、串珠状溶洞、碳质岩等)所取得的实际效果,并从瑞雷波曲线特征(频散特性、"之"字形拐点和曲率变化的位置)及反演真速度的大小等物性参数的角度出发,提出了瑞雷波分析的几个具体依据,强调了在应用瑞雷波法过程中需要重视的几个方面。

With the characteristics of the Rayleigh wave dispersion, it is an effective method to get the geological information in the rapid and accurate surveying. In this paper, based on the actual measured data of transient Rayleigh wave, genetic algorithms nonlinear inver- sion processing method is adopted to compare the geological information obtained by drill- ing so as to reveal effective results of formation velocity, covering thickness and other im- portant geological phenomena such as filling cave, beaded cave, carbonaceous rocks and etc. in the Rayleigh wave engineering surveying. From the characteristics of Rayleigh curve and physical parameters of the true velocity inversion, some basic points of Rayleigh wave analysis are raised and some aspects are emphasized in the Rayleigh wave method processing.