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“土拱结构”作为桩承式路堤中的主要荷载传递媒介,对路堤荷载传递和路堤填料位移有显著影响。基于室内模型试验,采用颗粒流软件PFC~(2D)建立桩承式路堤离散元(DEM)数值分析模型,基于应力主方向、接触力链及路堤填料沉降分布规律对路堤中“土拱结构”形态及其演化规律进行深入分析。研究结果表明:路堤中“土拱结构”随桩土相对位移的增加而逐渐发展并最终趋于稳定,最终的“土拱结构”形态呈0.8倍桩净间距高的抛物线形;路堤填筑高度对“土拱结构”形态、演化规律以及荷载传递效率有显著影响;路堤填料粗糙度、桩净间距及桩梁宽度对路堤荷载传递效率有显著影响,但对“土拱结构”最终形态几乎无影响。
As the main load transfer medium in piled embankment, “soil arch structure” has a significant impact on embankment load transfer and embankment packing displacement. Based on the indoor model test, numerical simulation model of pile-supported embankment discrete element (DEM) is established by using particle flow software PFC ~ (2D). Based on principal stress direction, contact force chain and embankment filler settlement distribution, “Morphology and evolution of the in-depth analysis. The results show that the embankment ”soil arch structure “ gradually develops with the increase of the relative displacement of the pile-soil and finally stabilizes. The final ”soil-arch structure“ The embankment filling height has a significant effect on the shape and evolution of soil arching structure and the load transfer efficiency. The embankment filling roughness, the net spacing of piles and the width of piles have a significant impact on the load transfer efficiency of embankments, Arch structure ”The final shape has almost no effect.