摘要
为了克服高密度电阻率成像的多解性,充分发挥电阻率联合剖面法对含水破碎带异常的分辨能力强、定位精确的优势,以输电线路隐伏岩溶探测为例,利用高密度电阻率成像与电阻率联合剖面法对塔位底部隐伏岩溶进行精细探测。结果表明,高密度电阻率成像虽能清晰反映岩溶发育位置及规模,但由于地下复杂地质造成其结果的多解性,而结合电阻率联合剖面法精确定位的特性,有效减少了其解释成果的多解性。通过实例证明,高密度电阻率成像与电阻率联合剖面法结合,辅以少量钻孔,精确查明了塔基范围内隐伏岩溶的位置及发育规模,即在目标塔位底部深度约10～12m位置存在具有一定连通性的泥质填充岩溶破碎带,其规模宽约2～3m,高约1～2m,该研究成果为排查塔基存在的地质隐患提供了有利证据。
In order to overcome the multiplicity of high-density electrical resistivity tomography,give full play to the good stability,high accuracy and strong resolution for water-bearing fracture zone of the combined profiles method.This paper takes a transmission line project as example,conduct buried karst detailed investigation for the towers combining the advantages of these two methods.The results show that the high-density electrical resistivity tomography can clearly reflect the location and scale of karst development,but the complex underground geology make the results confused.Combining the characteristics of precise location with the combined profiles method effectively reduces the multiplicity of interpretation results.It is proved that by combining the high-density electrical resistivity tomography with the combined profiles method,the location and development scale of the hidden karst in the base of tower is accurately identified with a small amount of boreholes.We located a clay filling karst fracture zone with a certain connectivity at the bottom depth of about 10~12 m,which is about 2~3 m wide in size and 1~2 m high.Which provides favorable evidence for investigating the geological hazards existing in the tower foundation and reliable basic data for the latter control measures.
作者
贺桂有
王永刚
He Guiyou;Wang Yonggang(Guizhou Electric Power Design&Research Institute Corporation Limited,Power Construction Corporation of China,Guiyang Guizhou 550002,China)
出处
《工程地球物理学报》
2019年第1期53-60,共8页
Chinese Journal of Engineering Geophysics
基金
贵州电网有限责任公司输电运行地质隐患调查项目(编号:KZ00121K)
关键词
高密度电阻率成像
岩溶探测
联合剖面法
输电线路
地质隐患
high-density electrical resistivity tomography
karst investigation
the combined profiles method
transmission line
geologic hidden trouble
