人工挖孔桩底不明采矿空区探地雷达探测  

The GPR Detection of Unknown Mining Cavities Beneath the Foundation Piles

作　　者：阳威[1] 邓世坤[1] 

机构地区：[1]中国地质大学地球物理与空间信息学院,武汉430074

出　　处：《工程地球物理学报》2009年第1期23-27,共5页Chinese Journal of Engineering Geophysics

摘　　要：采用探地雷达对某建筑场地人工挖孔桩进行探测,以探明桩端5倍桩径深度范围内基岩中是否有不明采矿空区存在。现场探测采用环形反射剖面法,运用EKKO PRO探地雷达系统,采用主频为200MHz的天线进行探测,取得桩底10m以上的有效探测深度。地质雷达探测记录能清晰、准确地反映人工挖孔桩底部及旁侧5倍桩径深度范围内采矿空区的存在及顶面埋深,但难以判别桩底空区与桩底的相对位置关系。Ground--penetrating radar was used to detect the unknown mining cavities in the bedrock within the depth of five times the pile diameters beneath the foundation piles at a construction field. The ring reflection profile＇ method was adopted to collect GPR data at the filed, and above 10 meters effective detecting depth below the foundation pile was achieved with 200MHz antenna for EKKO PRO GPR equipment. The collected GPR data can reflect the mining cavities within the depth of five times the pile diameters in the bedrock beneath the foundation pile clearly and accurately. But it is difficult to point out the relative position of the cavities to the foundation piles end.

关 键 词：人工挖孔桩 探地雷达 不明采矿空区 

分 类 号：P631[天文地球—地质矿产勘探]