关键词: 现场堆石体, 振动碾压, 数值模拟, 颗粒流

Abstract: Numerical simulations based on the PFC2D are conducted to investigate the vibration rolling compaction(VRC) of prototype rockfill. At first, an equivalent numerical model for vibrating roller is developed based on the analytical 2-degree-of freedom lumped mass model, in which interaction between drum and frame is considered carefully. Secondly, a practical modelling procedure for prototype rockfill is proposed; so that the segregation behavior of rockfill grains can be replicated truthfully. Thirdly, based on the prin-cipal of relative degree of density, settlement relationship between 2D and 3D sample is derived in an analytical way. Finally, a practical case in real project is replicated by the proposed discrete model; and simulation results are compared to the observed data in site, such as settlement, breakage ratio, grading curve and porosity. The research results show that the proposed numerical model can replicate the macro and meso-behavior of prototype rockfill during VRC progress in a reasonable way, proving the feasibility and correctness. Related researchments can help to understand the mesoscopic mechanism of dynamic response of prototype rockfill under VRC load, and lay the foundation of investigating the mechanical behavior of compacted prototype rockfill in future.

Key words: prototype rockfill, vibration rolling compaction, numerical simulation, particle flow code