综合物探方法在输电线路桩基岩溶探测中的应用  

Application of Integrated Geophysical Method to Karst Detection of Pile Foundation in Transmission Line

作　　者：吕明 王永刚 杨明瑞 Lü Ming;Wang Yonggang;Yang Mingrui(Guizhou Electric Power Design & Research Institute Corporation Limited, Power Construction Corporation of China, Guiyang Guizhou 550002, China)

机构地区：[1]中国电建集团贵州电力设计研究院有限公司,贵州贵阳550002

出　　处：《工程地球物理学报》2020年第3期386-392,共7页Chinese Journal of Engineering Geophysics

摘　　要：某220 kV输电线路桩基施工过程中,塔腿侧壁遇溶洞导致垮孔。为准确判定该溶洞是否沿桩基底部发育,根据现场地质条件,采用高密度电法与五极纵轴测深法进行综合探测。通过剖面对比分析可以确定,侧壁所遇溶洞沿C腿底部发育,溶洞顶部埋深为9.8 m,高4.5 m,宽约2~3 m,且为独立封闭填充型溶洞。最后通过钻孔验证基本查清了桩基底部溶洞发育情况,为C腿底部溶洞处理提供了可靠的依据。A tower leg collapse occurred because of the existence of karst cave on the side wall during the pile foundation construction of a 220 kV transmission line.To accurately determine whether the cave is developing along the bottom of the pile foundation,this paper carries out the integrated karst detection by adopting the high density electrical resistivity method and five poles electrical sounding on the basis of field geological conditions.The results show that the cave in side wall of C tower leg is developing along the bottom of the pile foundation through the contrastive analysis.The top of the cave is 9.8 m in buried depth.The caue is 4.5 m in height,and about 2~3 m in width.And the cave is an independent,closed and filled karst cave.Finally,the development of karst cave at the bottom of pile foundation is proved by drilling verification,which provides a reliable basis for processing the karst cave at the bottom of leg C.

关 键 词：输电线路 综合物探 高密度电法 五极纵轴测深法 岩溶探测 

分 类 号：P631.3[天文地球—地质矿产勘探]