Abstract: The compaction quality of a reservoir dam is crucial to control the stability and subsidence of dam body and to prevent the cracking of the facing panel. To ensure the quality of cushion material of Zhanghewan upper reservoir dam body, a trial compaction on the cushion materials was performed before the construction. Throughout this trial compaction, factors that might affect the degree of compaction of cushion materials were investigated. Compaction parameters were able to be optimized.

Key words: Cushion Materials, Compaction Quality, Roller Compaction, Compaction Parameters