Abstract: High pressure rotary jet grouting and large diameter drilling are integrated to treat the seepage of levees at Liaofang hydropower station in Jiangxi Province. Typical segments are selected for the jet grouting test. The grouting result is inspected and analysed to obtain technical parameters of the jet grouting. Through in-site test and water storage operation, this technique is verified to have good effect and sound quality in sandy gravel stratum. It could be a reference for the application of high pressure jet grouting in other seepage prevention projects.

Key words: integration of drilling and grouting, large diameter, high pressure jet grouting, protective works for Liaofang hydropower project in Jiangxi province, impervious wall