瑞雷波在探测地下防空洞的应用研究

Application of Rayleigh Wave in Inspecting Underground Air-Raid Shelter

瑞雷波作为一种新的地球物理勘探手段,已经在各个方面得到了广泛地应用。瑞雷波勘探的方法主要有两种,即瞬态法和稳态法。瞬态法因其施工方便、快捷得到了广泛应用。本文介绍了瞬态瑞雷波法探测地下防空洞的基本原理,提出了一种改进的方法。该方法利用相邻道的同一频率的瑞雷波的相位差,计算出该频率的瑞雷波在相应的勘探深度下的平均波速。在探测防空洞时,该方法比其它的方法具有明显优点,即施工方便,并能在一条测线的范围内准确清楚地看到频散曲线的跳跃,从而判断出防空洞的位置。通过一个具体勘探实例,验证这一方法的探测效果。

As a new method of geophysics exploration, rayleigh wave exploration has been widely used. There are two basic methods of rayleigh wave exploration： transient rayleigh waves and standing rayleigh waves. Because of its convenience, the method of transient ray- leigh waves has been extensively used. This article presented the basic principle about inspecting undergroud air- raid shelter with the method of transient rayleigh waves and offered a new method. In the method, the mean velocity of certain exploration depth can be calculated making use of the difference of phase from consecutive seismic channels. Campared wih the old methods, it has two advantage： 1） It can be applied expediently. 2） In this method, where the dispersive curve skips can be seen distinctly in the range of the whole survey line and the position of air-raid shelter can be easily estimated. A new exploration example was offered by this method. Finally,a proper evaluation about the exploration result was made.