论文部分内容阅读
为探讨碾压荷载类型、颗粒级配及颗粒形状等对压实质量的影响,分析接触力场和速度场的变化规律,从细观上研究碾压混凝土颗粒在碾压过程中的运动规律、密度形成机制及压实特性,基于颗粒流软件(PFC3D),采用离散元法对碾压混凝土的碾压全过程进行数值仿真。结果表明,碾压过程中,细颗粒不断向粗颗粒附近聚集;振动碾压阶段对碾压混凝土的孔隙率影响最大;在总孔隙率相对较低的条件下改变级配,中等骨料的含量对碾压混凝土的压实孔隙率有显著影响;骨料中球形颗粒较扁平、细长颗粒多时,碾压混凝土更易被压实。
In order to discuss the influence of rolling load types, particle gradation and particle shape on the compaction quality, the change rules of contact force field and velocity field are analyzed, the law of motion of roller compacted concrete particles during rolling process is studied from the perspective of meso- Density formation mechanism and compaction characteristics, based on the particle flow software (PFC3D), the whole process of roller compaction of RCC was numerically simulated by the discrete element method. The results show that the fine particles continuously gather near the coarse particles during the rolling process. The vibrational compaction stage has the greatest influence on the porosity of the roller compacted concrete. When the total porosity is relatively low, the content of the aggregate, medium aggregate The compacted porosity of roller compacted concrete has a significant impact; aggregate spherical particles are flat, elongated particles, the more easily compacted RCC.