基于离散元数值模拟的桩承式加筋路堤土拱效应研究

桩承式加筋路堤能有效控制地基沉降和侧向变形,可快速填筑施工,大大缩短施工工期。土拱效应是桩承式路堤的主要工作机制,目前有多种模型。然而,对于不同路堤高度条件下桩承式加筋路堤土拱效应演化重视程度还不够。本文通过桩承式加筋路堤离散元数值模拟,验证了路堤变形为同心椭圆模式,高路堤条件下路堤存在等沉面且等沉面高度随路堤填筑高度增加而减小;揭示了填料高度增加下的桩承式路堤土拱效应变化规律以及桩承式加筋路堤土拱高度随路堤高度增加而降低的现象。

Study on Soil Arching Effect of Geosynthetic-reinforced Piled Embankments Based on DEM Numerical Simulation

Piled embankments reinforced by geosynthetics can effectively control the settlement and lateral deformation of the ground,and has the advantage of quick construction,which can greatly shorten the construction period.Soil arching effect is the main working mechanism of piled embankments,and there are many analytical models at present.However,the evolution of soil arching effect of pile-supported reinforced embankment under different embankment height is not well studied.Using the discrete element numerical simulation of pile-supported reinforced embankment,the deformation pattern of the concentric elliptical model is verified,and there is an equal settlement surface under the condition of high embankment and its height decreases with the increase of embankment filling height.The change rule of soil arching effect of pile-supported embankment with the increase of filling height and the phenomenon that soil arch height of pile-supported reinforced embankment decreases with the increase of embankment height are revealed.