高密度电阻率法在贵州岩溶地区塌陷测量效果探讨

贵州岩溶地区多见由隐伏溶洞诱发的地面塌陷地质灾害。高密度电法近年来被广泛地应用于灾害地质调查及工程勘查中。以高密度电阻率法在贵州岩溶地区一个地面塌陷勘查项目应用为例,建立了无物质填充、全物质填充、半物质填充三个不同岩溶模型进行反演分析,并用实测数据进行正演、反演计算,分析异常性质、规模等,最后与已知钻孔控制的地层与塌陷位置实地情况综合对比分析,利用半物质填充模型反演视电阻率断面图,发现地面塌陷下方隐伏溶洞位置。结果显示,该法能够为岩溶地区分析、治理塌陷地质灾害提供科学依据。

The Effect of High-density Resistivity Method on Collapse Measurement in Karst Area of Guizhou Province

The ground collapse disasters induced by hidden karst caves are common in karst areas of Guizhou province.In recent years.high-density resistivity method has been widely used in disaster geological investigation and engineering exploration.In this paper,taking a ground collapse exploration project in Guizhou karst area as an example,three different karst models,i.e.no material filling,full material filling and semi一material filling,are established for inversion analysis.Then the measured data are used for forward modeling and inversion calculation,analyzing the abnormal properties,size and so on.Finally after analying the strata controlled by the known borehole and the situation of the collapse location,the location of hidden karst cave under the ground collapse has been found by using the inversion apparent resistivity profile of semi一material filling model.It turns out that the high一density resistivity method can provide scientific basis for the treatment of geological disasters in karst areas.