水库堤坝渗漏的探地雷达探测研究

以甘肃省民乐山丹地震时受到一定破坏的李桥水库为对象,用探地雷达对水库大坝填土不密实引起的渗漏病害进行了探测研究。探测表明壤土心墙填土总体密实性差,松散、不均匀、裂隙较多,坝身长期渗漏已在部分区域形成洞穴。利用探地雷达技术对该水库东、西段坝顶下和坝后道路下心墙内的渗漏通道进行了诊断,进而提出了水库堤坝渗漏破坏经历3个发展时期及其对应的雷达图像特征。

Study of Seepage Through Reservoir Dam Using Ground Penetrating Radar Detection

Based on the partial destruction of Liqiao reservoir during Minle earthquake in Gansu province,Ground Penetrating Radar is used to study the seepage disease resulting from incompact earthfill in the course of construction. Detection results indicate that dam loam core wall is incompact, uneven and rich in cracks. The long-term seepage of the dam has caused various caves in some areas. The seepage pathway of core wall is diagnosed below the eastern and western dam crest and under dam slope road. The detecting mechanism of ground penetrating radar for seepage pathway is studied; the three development phases of dam seepage breakage and corresponding radar image characteristic are put forward.