Abstract: Since the impoundment of Qiyan reservoir, the seepage behind the dam increased gradually as the water level rose. On April 30, 2015, when the water level reached the elevation 1 218 m, the seepage hit 12 L/s, which was far beyond the designed allowable range and seriously affected the dam safety and stability. After analysis of the investigation results of dam foundation, the previous investigation results and the geological data during construction period, the curtain grouting by high-pressure jet grouting was adopted to control the seepage and the current operation showed that it was effective. This paper introduces the treatment technology, to provide reference for similar projects.

Key words: earth rockfill dam, seepage prevention, high pressure, jet grouting

摘要： 景宁县企岩水库建成蓄水后，坝后渗漏量随水位上升逐渐增大，2015年4月30日蓄水至1 218 m高程时，渗漏量达12 L/s，远超设计允许范围，严重影响大坝安全稳定。综合分析坝基渗漏勘察、前期勘察资料及施工期地质成果等相关资料后，经方案比选采取了高压旋喷灌浆工艺的帷幕灌浆防渗处理措施。从目前运行情况看，处理效果显著。笔者对处理技术进行了总结，可为类似工程渗漏处理提供借鉴。

关键词: 土石坝, 防渗, 高压, 喷射灌浆