深溪沟水电站大坝横缝大漏水治理技术

深溪沟水电站蓄水后,左岸泄洪闸坝段横缝出现大量渗漏水,漏水量约1 900 L/min,原施工期曾进行堵漏处理但效果不佳,遗留了工程安全隐患。为确保大坝运行安全,在分析横缝漏水部位及漏水成因的基础上,采取在窄小廊道斜钻孔技术穿透横缝第二道止水铜片埋设灌浆管,对两道止水之间灌注LW/HW型水溶性聚氨酯,封闭两道止水铜片间的渗流通道,成功封堵了横缝的大漏水。本项技术具有较好的推广应用价值。

Treatment of leakage at the transverse joint of Shenxigou hydropower station

After impoundment of Shenxigou hydropower station, water leakage about 1 900 L/min was found at the transverse joint in the sluice block. Treatment was carried out in construction but it didn＆#39;t work. For dam safety, based on cause analysis, grouting of LW/HW water-soluble polyurethane was ad-opted. By oblique drilling through the second copper water-stop in the transverse joint, the grouting pipe was embedded and the following grouting sealed the leakage passage between the two copper water-stops successfully, worthy reference.