东南沿海典型浅覆盖区高密度电阻率法残坡积层测深研究  

Study on thickness measurement of eluvial slope layer by high density resistivity method in typical shallow covered areas of southeast coast

作　　者：房浩[1] 李晨[2] 雷晓东[2] 杜显祥 孙杰夫 韩宇达 FANG Hao;LI Chen;LEI Xiaodong;DU Xianxiang;SUN Jiefu;HAN Yuda(China Institute of Geo-Environment Monitoring,Beijing 100081,China;Beijing Institute of Geo-Exploration Technology,Beijing 100120,China;College of Water Resources and Environment, China University of Geology, Beijing 100083, China)

机构地区：[1]中国地质环境监测院,北京100081 [2]北京市地质勘察技术院,北京100120 [3]中国地质大学(北京)水资源与环境学院,北京100083

出　　处：《中国地质灾害与防治学报》2020年第4期85-93,共9页The Chinese Journal of Geological Hazard and Control

基　　金：中国地质调查局“全国地质灾害数据更新与服务”二级项目(DD201906038)。

摘　　要：确定残坡积层厚度对于山区地质灾害防治具有重要意义。因底界埋深、岩性和含水率等因素变化大以及探测目标较浅、分辨力要求高等原因,浅覆盖区残坡积层厚度探测的难度较大。为精准探测残坡积层覆盖厚度,并给类似地区开展相关探测工作提供技术参考,同时为区域内高精度地质灾害调查评价结果准确提供有力保障,本文选择杭州典型斜坡为对象开展高密度电阻率法残坡积层覆盖厚度测深试验研究,结果表明,采用温纳α装置、极距0.5~2 m,能够很好地划分出残坡积层、全风化层、强风化层及完整基岩之间的界面,定量分辨0.5 m及以上残坡积层厚度,探测结果得到了钻孔验证。实测中应根据具体地质条件选择不同的装置型式、极距等参数。本研究成果为探索构建第四系浅覆盖区地质灾害调查技术方法体系提供了支持。Determining the thickness of eluvial slope layer is of great significance to the prevention and control of geological disasters in mountain areas.It is difficult to detect the thickness of eluvial slope layer in shallow coverage area due to the large changes of the buried depth of bottom boundary,lithology,water content and other factors,as well as the shallow detection targets and high resolution requirements.In order to provide methods and techniques for the prevention and control of geological disasters in similar areas,a high density resistivity detection experiment was carried out in a typical mountain area of Hangzhou.The results show that the interface between eluvial layer,fully weathered layer,strongly weathered layer and hard bedrock can be well divided by using Wennaαdevice and polar distance of 0.5 to 20 m,the thickness of eluvial slope layer which is above 0.5 m can be quantitatively distinguished.And the detection results have been verified by drilling.In actual measurement,different device types,polar distances and other parameters should be selected according to specific geological conditions.The research results provide support for exploring and constructing the technical and methodological system of geological hazard investigation in Quaternary shallow overburden area.

关 键 词：高密度电阻率法 残坡积层 全风化花岗岩 浅覆盖区 

分 类 号：P631.3[天文地球—地质矿产勘探]