碾压混凝土分层碾压离散元模拟及施工成层细观机理研究OA北大核心CSTPCD

The unique layered compaction process of a large working area determines that the quality of bonding be-tween layers is key to ensuring the operation safety of roller-compacted concrete(RCC)dam.Revealing the RCC construction-induced interfaces mechanism from the perspective of construction control and adjusting the compaction parameters can effectively ensure the construction quality.First,the compaction settlement law,compaction de-gree,and shear strength of RCC during layered compaction process were tested,providing a basis for discrete ele-ment simulation.Then,the discrete element models of RCC double-layer compaction and shear test were estab-lished and verified.Finally,the aggregate embedding value which characterizes the joints bonding quality was de-fined,and the meso-mechanism of RCC construction-induced interfaces was analyzed from the aspects of porosity,aggregate embedding,and joints stress distribution and shear strength.The results show that the increase of exciting force and the decrease of rolling speed and lift thickness are beneficial to improve the joints bonding quali-ty,and the lift thickness is the most sensitive factor affecting the quality.This study provides a theoretical support for controlling the joints bonding quality during RCC construction.