探地雷达用于人工挖孔桩桩底岩溶探测的应用研究  

APPLICATION STUDY OF THE GPR METHOD IN THE DETECTION OF KARSTS BENEATH ARTIFICIAL EXCAVATED HOLE PILE

作　　者：胡朝彬[1,2] 邓世坤[3] 王宝勋[1,2] 张进[1] 张长斌[1] 

机构地区：[1]天津华北地质勘查局,天津300181 [2]天津华勘基础工程检测有限公司,天津300181 [3]中国地质大学地球物理与空间信息学院,武汉430074

出　　处：《地质灾害与环境保护》2009年第2期74-78,共5页Journal of Geological Hazards and Environment Preservation

摘　　要：在岩溶地区进行楼房建设、工厂修建、修路架桥时,其桩基的设计很多采用人工挖孔嵌岩灌注桩(人工挖孔桩)。通过对人工挖孔桩桩底目前几种探测手段的对比分析,运用探地雷达方法对桩底进行岩溶探测有其独特的优势。文章首先介绍了探地雷达桩底探测的具体方法,并根据介质介电常数的变化分析了探地雷达天线在桩底的辐射特征;其次,对桩底的两种地质模型进行了正演模拟;最后对岩溶地区人工挖孔桩底实测探地雷达剖面进行了分析解释。In the construction of high storied buildings, factories, roads and bridges in karsts regions, artificial excavated hole pile basements are often designed and adopted. Having analyzed and compared several methods of detection of karsts beneath the artificial excavated hole used at present, we found that GPR method possesses unique advantages. In this paper, at first, the GPR detection method of karsts beneath artificial excavated hole pile was introduced and discussed in detail, and based on the change of media permittivity, the antenna radiation characteristics beneath artificial excavated hole pile was analyzed. Secondly, we constructed two kinds of horizontal layered geological models and calculated their synthetic GPR records. Finally, some GPR records collected in the karsts detection beneath the artificial excavated holes were analyzed and interpreted.

关 键 词：探地雷达 人工挖孔桩 桩底检测 天线辐射特征 正演模拟 

分 类 号：P642[天文地球—工程地质学]