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 seep-age 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 re-sults and the geological data during construction period,the curtain grouting by high-pressure jet grout-ing 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.
维普
万方数据