关键词: 高喷防渗墙, 金桥水电站, 改线公路

Abstract: The foundation of the relocated road in the underground powerhouse project of Jinqiao hydropower station in Tibet is located on the floodplain and riverbed of Yigong Zangbu river. Its lithology is sand gravel stratum, base is metamorphic quartz sandstone and sand lenses exist in some sections which result in high standards for seepage prevention and difficulties in construction of high pressure jet grouting cutoff wall. During the road construction, the relevant parameters of high pressure jet grouting cutoff wall were adjusted based on the construction process and the test and monitoring data showed that the wall was well cemented and continuous. Its effect could meet the design requirements and it went through the flood happened in 2017 whose return period was longer than 20 years which proved the effectiveness of the high pressure jet grouting cutoff wall.

Key words: high pressure jet grouting cutoff wall, Jinqiao hydropower station, relocated road