综合物探方法在库区渗漏通道勘探中的应用

Application of comprehensive geophysical prospecting method in leakage channel exploration of reservoir area

浑水塘水库地处石灰岩地区,库区三面环山,岩溶发育;雨季库周地表水汇集从坝址处排泄,地下水排泄不畅时,水从天窗溢流而出。该水库拟通过筑坝拦截库周地表水流及封堵渗漏通道蓄水成库,为建库蓄水成功须查明渗漏通道的发育方向及埋深。为此,采用包括大地电磁法、高密度电法、电磁波CT等在内的多种物探手段对库周岩溶发育情况及库区地下水的大致流向进行综合勘探,基本查明库区渗漏通道的发育方向及埋深,为库区防渗处理提供依据。

Hunshuitang Reservoir is located in limestone region.The reservoir area is surrounded by mountains on three sides with karst developed.Surface water around the reservoir is collected and discharged from the dam site in rainy season.When the underground water is not drained smoothly,the water overflows from the skylight.It is planned to construct dam to retain the surface water around this reservoir and close the leakage channel.Compre⁃hensive exploration was conducted by multiple geophysical prospecting methods such as magnetotelluric method,high-density electrical method,electromagnetic wave CT etc.to investigate the karst development around reservoir and the approximate flow direction of groundwater in the reservoir area.The development direction and burial depth of the leakage channels were found out,which provide basis for seepage prevention in reservoir area.