钻孔雷达与数字摄像在地质勘探中的综合应用  

Integrated application of borehole GPR and borehole imaging to geological curveys

作　　者：钟声[1,2] 王川婴[2,3] 吴立新[4] 唐新建[2] 王清远[1] 

机构地区：[1]四川大学建筑与环境学院,成都610065 [2]中国科学院武汉岩土力学研究所,武汉430071 [3]中国科学院岩土力学与工程国家重点实验室,武汉430071 [4]东北大学测绘遥感与数字矿山研究所,沈阳110819

出　　处：《地球物理学进展》2011年第1期335-341,共7页Progress in Geophysics

基　　金：教育部创新团队项目(IRT0640);国家杰出青年基金课题(5052541)资助

摘　　要：由于地质条件的特殊性和复杂性,利用传统的现场钻探手段来准确地评价岩体质量仍存在一系列的问题:钻探岩心提供的是一维信息,很难准确获知地质结构的空间特征以及周围岩体的地质信息;钻进过程中机械扰动导致岩芯破碎等因素也可能使得岩心不能正确反映岩体地质特征.本文将钻孔地质雷达和数字钻孔成像两种勘察方法结合起来,对钻孔孔壁以及周围岩体进行探测,获取工程场址的地质信息,快速评估所关心区域是否存在不良地质体等工程隐患.介绍了钻孔雷达与数字摄像综合勘察技术的定义、应用范围和研究内容,通过工程应用实例分析,证明该勘察方法能有效地发挥两种勘察技术的各自特点,结合两者的数据信息,能更好地对钻孔周围的岩体地质特征进行描述,并进行岩体完整性评价.Site investigation with drilling of boreholes to reveal geological features at a site usually encounters a number of difficulties. The drill core is one dimensional from which the spatial characteristics of geological bodies cannot be clearly defined. After the drill core is taken out of the ground, it can not reveal accurately the true in-situ state of the rock mass. While increasing the number of boreholes may improve the reliability of the results, it is still difficult to accurately ascertain the not drilled area between the boreholes, and the cost and time required will increase. This paper describes a new integrated exploration method based on combining borehole radar and borehole imaging technology. With this method, the physical and geometrical characteristics of the rock mass at and around a borehole can be revealed. Therefore the geological structures and unfavourable features if any in the vicinity of the borehole can be rapidly and accurately determined. A case study was carried out for a rapid transit system located in limestone formation in Tengzhou County, Shandong Province, China. Application of the method leads to the following conclusions. （1） Radar technology and borehole imaging are complementary with each other in yielding informalion on joint patterns, underground caverns, existence of metallic objects and disturbance from the ground surface. （2） The radar cross section and horeholeimage together provide important data for accurate interpretation of the geological features in and around a borehole. （3） The borehole radar and the borehole imaging both give superior results for evaluating rock mass quality.

关 键 词：钻孔地质雷达 数字全景摄像 地质勘探 综合应用 

分 类 号：P631[天文地球—地质矿产勘探]