摘要
利用井间超高密度电阻率法对广州地铁某在建段浅层隐伏岩溶发育情况进行了探测实验。结果表明:利用现有勘察孔进行井间超高密度电阻率法探测溶洞是可行的,通过正反演计算获得的井间电阻率分布特征能直观给出溶洞在横向、纵向上的分布范围,但是对溶洞连通性不易区分,深度偏差为电极距大小。探测时,电法孔孔深一致,孔深和孔间距比大于1.5倍,电极间距1~2 m。
The prospecting of shallowly concealed karst caves is studied using the cross-hole ultra-high density resistivity method.The results are as follows.It was feasible to prospect Karst caves using existing survey boreholes according to the cross-hole ultra-high density resistivity method.The transverse and longitudinal distribution ranges of karst caves can be directed reflected by the distribution characteristics of the cross-hole resistivity obtained through forward and inverse calculations.Meanwhile,it was difficult to distinguish the connectivity between karst caves,and the depth deviation was the distance between two adjacent electrodes.It is suggested that the depth of the boreholes used should be consistent,the ratio of the borehole depth to the borehole space should be higher than 1.5,and the electrode space should be 1~2 m in practice.
作者
苏宝
刘晓丽
卫晓波
高歌
王云鹏
SU Bao;LIU Xiao-Li;WEI Xiao-Bo;GAO Ge;WANG Yun-Peng(Guangdong Pearl River Delta Intercity Rail Transit Co.,Ltd.,Guangzhou 510335,China;School of Civil Engineering,Tsinghua University,Beijing 100084,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;Guangzhou Metro Group Co.Ltd.,Guangzhou 510330,China;Research Institute of Exploration and Development,Huabei Oilfield Company,PetroChina,Renqiu 062552,China)
出处
《物探与化探》
CAS
北大核心
2021年第5期1354-1358,1366,共6页
Geophysical and Geochemical Exploration
基金
国家重点研发项目(2018YFC1504801)
国家自然科学基金重大项目(41941019)
国家自然科学基金面上项目(52079068)。
关键词
城市地质
井间电法
超高密度电法
溶洞
urban geology
cross-hole resistivity method
ultra-high density resistivity method
Karst cave