基于PFC2D的建筑固废路基填料混凝土直剪试验数值模拟研究OA

To uncover the mechanism underlying the influence of coarse particle content on the shear behavior of construction waste roadbed fillers,facilitate the high-efficiency utilization of construction waste,and advance green and sustainable development in the transportation sector,this study investigates the effects of varying coarse particle contents(40%,60%,and 80%)on the mechanical behavior of con-struction waste roadbed fillers during concrete direct shear tests via Particle Flow Code(PFC2D)numeri-cal simulation rooted in the discrete element method(DEM).The reliability of the numerical model is val-idated through comparison with experimental data obtained from indoor large-scale direct shear tests.Re-sults demonstrate that both the peak strength and residual strength of the soil exhibit an increasing trend with the rise in coarse particle content,attaining their maximum values at a coarse particle content of 80%.Mesoscopic analysis reveals that changes in coarse particle content significantly influence the distri-bution of inter-particle contact force chains.This research indicates that coarse particle content ultimately governs the macroscopic mechanical response of the soil by regulating the transmission paths of the meso-scopic force chain network,thereby elucidating the mechanism by which coarse particle content affects the mechanical properties of the soil.The findings provide a reference for theoretical research and engineering practice concerning the engineering characteristics of coarse-grained soils.