关键词: 远距离回填灌浆, 触变性, 裂缝填充, 管道填充, 断层填充

Abstract: In plugging of construction drainage pipe of Three Gorges hydropower station, it is characterized by large buried depth, long distance and small space for operation. In this project, it is necessary to keep relatively smooth of grouting material in pipe outlet, and to fill well under certain pressure difference. Due to the irreversibility of plugging, failing to full closure at one time would leave a major hidden danger to dam's safe operation. According to the actual situation of the project, the required characteristics of grouting material are studied. The reliability of material and construction technology are verified by material development and field model simulation test. On this basis, single-point and long-distance backfill plugging is successfully carried out.

Key words: remote backfill grouting, thixotropy, crack filling, pipe filling, fault filling