重力坝溢流坝段边墩横缝漏水成因检查与分析

Inspection and Analysis of Leakage Causes of Pier Transverse Joints in Overflow Section of Gravity Dam

南水北调中线工程丹江口大坝加高工程完成后,在蓄水过程中发现在初期工程范围内溢流坝段边墩横缝处理较大流量渗漏。采用了钻孔录像、压水检测、注水试验、水下摄像和声波CT等手段,实施了渗漏缺陷综合检查,发现横缝铜止水周边混凝土层间缝缺陷及上下游铜止水破损,并确定了渗漏通道及其高程,提出了横缝渗漏处理方案。

After the heightening project of Danjiangkou dam in the middle route of South-to-north water transfer project, it was found that large flow leakage occurred in the lateral pier joints of the overflow dam section in the initial stage of the project. Borehole photography, water injection test, underwater photography and acoustic chromatography(CT)were used to carry out a comprehensive inspection of the leakage defects. The defects of the concrete interlayer joints around the cross seam copper water stop and the water stop damage defects of the upstream and downstream copper were found, the leakage passage and its elevation were determined, and the treatment scheme of the cross seam leakage was put forward.