基于孔中雷达反射成像特征的岩溶定量化评价  

Karst quantitative evaluation based on the characteristics of borehole radar reflection

作　　者：李录娟[1] 贾龙[1,2] 殷仁朝 LI Lujuan;JIA Long;YIN Renchao(Institute of Karst Geology,CAGS/Key Laboratory of Karst Dynamics,MNR&GZAR,Guilin,Guangxi 541004,China;Innovation Center of Karst Collapse Prevention Technology,China Geological Survey,Guilin,Guangxi 541004,China)

机构地区：[1]中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室,广西桂林541004 [2]中国地质调查局岩溶塌陷防治技术创新中心,广西桂林541004

出　　处：《中国岩溶》2021年第5期901-906,共6页Carsologica Sinica

基　　金：中国地质调查局项目“渝中湘南岩溶塌陷区综合地质调查”(DD20190266);“桂东北岩溶系统基础地质调查”(DD20190022);中国地质调查局中国地质科学院基本科研业务费项目“岩溶塌陷隐患识别技术方法试验研究”(2020005);广西壮族自治区自然资源厅政府采购项目<岩溶塌陷隐患快速三维探测识别试验研究及成套技术集成>(项目编号:2019-266)。

摘　　要：为准确评价隐伏岩溶区的强岩溶发育特征,采用孔中雷达反射成像技术,利用不同地层的电性差异特征以及探测钻孔孔壁地层岩溶发育情况,并根据岩体中雷达反射波的强度衰减特性,建立钻孔雷达最大探测距离与地层岩溶率的关系,定量推算出地层岩溶发育程度。结果表明:孔中雷达反射成像技术可获得钻孔半径10~30 m范围,甚至更远区域的岩溶发育信息。利用钻孔雷达最大探测距离与地层岩溶率的关系,可得到钻孔周边地层岩溶发育的定量化评价,分析各层位不同埋深的岩溶发育情况,可为地质勘察和工程建设提供更详实的基础数据,具有较好应用前景。Based on different electrical characteristics of the strata and the karst development situation in the surrounding strata of borehole,as well as the different strength attenuation of the radar reflected wave in different rock this study intends to build the relationship between the maximum radar detection range and the karst rate,and calculate the development degree of the karst strata by radar reflection imaging technology in the borehole.The study shows that the karst development data,ranging from 10 to 30 meters of the borehole radius,or even further,can be got by the radar reflection imaging technology.The statistics of karst rate got by drilling can be used to analyze the karst development degree at different depths.These statistics can provide detailed basic data for geological investigation and engineering construction.This study also illustrates the wide applicability of radar reflection imaging technology to the quantitative study on karst development of the boreholes without cores.

关 键 词：岩溶率 地质雷达测井 岩溶探测 岩溶发育评价 

分 类 号：P631.8[天文地球—地质矿产勘探]