高密度电阻率法在城市岩溶探测中的应用研究  

Research on the Application of Electrical Resistivity Tomography for Urban Karst Exploration

作　　者：林才德 唐孟雄 刘祥泰 马一航 林杞旋 孟旭 LIN Cai-de;TANG Meng-xiong;LIU Xiang-tai;MA Yi-hang;LIN Qi-xuan;MENG Xu(School of Civil Engineering and Transportation,Guangzhou University,Guangzhou 510006;Guangzhou Municipal Construction Group Co.,Ltd.,Guangzhou 510030)

机构地区：[1]广州大学土木与交通工程学院,广州510006 [2]广州市建筑集团有限公司,广州510030

出　　处：《广州建筑》2025年第2期50-54,共5页GUANGZHOU ARCHITECTURE

基　　金：广州市建筑集团有限公司科技计划项目([2022]-KJ035)。

摘　　要：岩溶是工程建设中常见的不良地质现象,施工中可能引发岩溶水突涌、地面塌陷、溶洞垮塌等灾害,造成严重的财产损失和人员伤亡,因此迫切需要对岩溶的空间分布进行勘测。地质钻探是岩溶探测的常用方法,但成本高、效率低,且容易出现漏判。高密度电阻率法(Electrical resistivity tomography,ERT)具有数据处理方便、成像直观、抗干扰能力强、成本低等优点,已广泛应用于地下岩溶、煤矿采空区、滑坡和水库渗漏等的探测与成像。本文利用高密度电法研究沿海城市环境岩溶的电阻率响应特征,并通过钻探进行验证。试验结果表明,高密度电法推断的基岩面与岩心样本高度吻合;填充饱和砂土等低电阻率介质的岩溶在高密度电法反演结果中表现为U型基岩面异常。Karst formations represent a common adverse geological phenomenon in engineering construction,which may cause karst water gusher,ground collapse,cave collapse,leading to severe property damage and potential casualties.Consequently,there is an urgent need to survey the spatial distribution of karst formations.Geological drilling is a common method for karst exploration;however,it is costly,inefficient,and prone to misinterpretation.Electrical resistivity tomography(ERT)has the advantages of convenient data processing,clear imaging,strong anti-interference capabilities,low cost,and has been widely applied in the detection and imaging of coal mine goafs,landslides,reservoir leakage,and karst formations.In this study,the resistivity response characteristics of karst in the coastal city are studied by the ERT method,and validated through drilling.Experimental results indicate that the bedrock surface inferred by the ERT method closely match the core samples.Karst filled with low-resistivity media such as saturated sandy soils appear as U-shaped bedrock surface anomalies in the ERT inversion results.

关 键 词：岩溶 高密度电法 电阻率剖面 基岩面 平滑约束最小二乘法 

分 类 号：P64[天文地球—地质矿产勘探]