关键词: 大坝, 排水槽, 化学灌浆, 新工艺

Abstract: Drainage channel of dam transverse joint is designed for facilitating the waterstop inspection and processing, but in the case of massive leakage from drainage channels, materials and procedure of traditional chemical grouting, such as the use of water-soluble elastic polyurethane LW in grouting and plugging, can easily cause the feeding pipe burst due to its rapid reaction with water. In this paper, an innovated chemical grouting process based on hydrostatic displacement mode is proposed, which can effectively control the pressure and flow at the inlet and outlet. The grouting process is carried out in the order of isolating agent, guiding fluid and finally the main material——mixture of LW and HW, which can effectively avoid the premature contact of LW and water, and achieve good grouting result.

Key words: dam, drainage channel, chemical grouting, new technology