空气型采空区的地球物理异常理论识别模型分析

Theoretical recognition model analysis of geophysical anomalies in air type goaf

本文建立空气型采空区的地球物理异常理论识别模型,应用正演模拟方法对在不同采空区埋深(h):采空区边长(b)比值下的空气型采空区异常特征进行分析。结果表明,在温纳装置下,空气型采空区显示为高阻异常特征。同时,在采空区边长(b)不变的情况下,随着比例系数的逐渐增大,采空区埋深逐渐加深,对采空区的分辨率逐渐降低。当h:b=1:1时,可准确识出采空区具体形态及其分布范围;当h:b=4:1时,已超出有效探测深度范围,无法识别出采空区。

In this paper,the theoretical recognition model of geophysical anomalies in air type goafs is established,and the characteristics of the anomalies in air type goafs under different buried depth(H):side length(b)ratio of goafs are analyzed by using forward modeling method.The results show that under the Wenner device,the air type goaf shows the abnormal characteristics of high resistance.At the same time,under the condition that the side length(b)of goaf is constant,with the increase of proportion coefficient,the buried depth of goaf is gradually deepened,and the resolution of goaf is gradually reduced.When h:B=1:1,the specific shape and distribution range of goaf can be accurately identified;when h:B=4:1,it has exceeded the range of effective detection depth,and the goaf cannot be identified.