Application of comprehensive geophysical exploration technology in geological survey of open-pit mine slopes
郭子萍 1陈相帅 1汪孝博 1职志攀1
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作者信息
1. 河南省地质局矿产资源勘查中心,河南郑州 450000
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摘要
露天矿山边坡矿体内部存在裂隙、节理等岩体结构,对边坡稳定性产生直接或间接的影响.而单一的物探技术只能获取地质结构某一方面的信息,在地质勘探方面存在局限性.为确保边坡稳定,设计一种综合物探技术下露天矿山边坡地质勘测方法.以地下介质电阻率、密度等地球物理特征为依据,融合瞬变电磁法、高密度电法、地震映像法作为综合物探手段,在Geogiga Front End Free软件工具上,形成地震映像图和视电阻率截面图.根据所得勘测结果显示,通过地震映像法能准确描述出地质形态、地层结构和厚度,高密度电法能够清晰展示出边坡区域下浅层塌陷部分的空间范围及低阻特性明显的填充物,瞬变电磁法能够准确地对超过百米深的地层中的异常体做出响应,证明综合物探技术具有良好的勘探能力.
Abstract
There are cracks,joints,and other rock mass structures within the slope of open-pit mines,which directly or indirectly affect the stability of the slope.However,a single geophysical technology can only obtain information on a certain aspect of geological struc-ture,which has limitations in geological exploration.To ensure slope stability,a geological survey method for open-pit mine slopes using comprehensive geophysical technology was designed.Based on geophysical characteristics such as resistivity and density of underground media,transient electromagnetic method,high-density electrical method,and seismic imaging method were integrated as comprehensive geophysical exploration methods.On the Geogiga Front End Free software tool,seismic imaging maps and apparent resistivity cross-sec-tional maps were formed.According to the survey results obtained,the seismic imaging method can accurately describe the geological form,stratigraphic structure,and thickness.The high-density electrical method can clearly display the spatial range of the shallow col-lapse part under the slope area and the filling material with obvious low resistance characteristics.The transient electromagnetic method can accurately respond to abnormal bodies in layers over a hundred meters deep,proving that comprehensive geophysical technology has good exploration capabilities.
关键词
综合物探技术/露天矿山边坡/地质勘测/瞬变电磁法/高密度电法/地震映像法
Key words
comprehensive geophysical exploration technology/slope of open-pit mines/geological survey/transient electromagnetic method/high density electrical method/seismic imaging method
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