高面板堆石坝趾板基础灌浆抬动控制研究

 针对水布垭面板堆石坝坝基层状岩体倾角平缓且岩溶构造发育、趾板上灌浆盖重小、水库运行水头高、后期没有维修补灌条件等不利因素进行了灌浆试验。试验中趾板抬动变形观测首次采用了可自动记录和报警的装置，趾板抬动得到较好的控制，确保趾板基础接触段固结和帷幕灌浆最大压力分别安全地达到0.5 MPa和1.5 MPa。通过分析大量抬动变形观测数据，从统计意义上给出了抬动变形有效观   测半径和抬动变形观测值在抬动观测距离上的线性衰减率，为大规模生产过程中的抬动观测   孔布置和根据不同观测距离确定抬动变形限值提供了重要的依据。

Study on Lift Control of Toe-plate Grouting of High Concrate-Faced Rockfill Dam

In accordance with the features, such as the gentle dip angle and developed karst structure of the bedded rock body in the dam site of Shuibuya Hydropower Station, the light grouting cover weight on the toeplate, the high operation water head of the reservoir, and without late repair or regrouting conditions, the grouting test was conducted on the toe-plate. As a result of adopting the automatic lift observation recording-device and warning facilities for the lift observation on the toe-plate, the lifting deformation of the toe-plate during the grouting gets to be better controlled so as to effectively boost the maximum grouting pressure of consolidation grouting and curtain grouting to 0.5 MPa and 1.5 MPa respectively. According to analyzing a large amount of lift deformation data, effective observation radius and the linear damping ratio of toe-plate lifting deformation were obtained statistically, which can serve as for the important criterion for the arrangement of lift observation holes and the lift control based on experiential observation distance in the grouting project.