关键词: 丰满重建工程, 泄洪兼导流洞, 回填灌浆, 地质雷达

Abstract: The backfill grouting of hydraulic tunnel, which makes concrete lining and surrounding rock tightly combined, is one of the important measures to ensure the safe operation of entire tunnel. The main quality accidents of backfill grouting of hydraulic tunnel include low compactness, concrete lining separation, and so on. For the engineering quality assurance, the ground penetrating radar (GPR) is used to test the backfill grouting quality of flood discharge and diversion tunnel in Fengman dam reconstruc⁃ tion project. By properly selecting the main frequency of the antenna and combining with the actual geological conditions of flood discharge and diversion tunnel, the GPR can quickly and continuously detect grouting quality and provide accurate information.

Key words: Fengman dam reconstruction project, flood discharge and diversion tunnel, backfill grouting, ground penetrating radar