岩土工程学报2017，Vol.39Issue(11)：2050-2057,8.DOI:10.11779/CJGE201711013
桩承式路堤"土拱结构"形成演化规律离散元分析
Discrete element analysis of the development and evolution of "soil arching" within a piled embankment
摘要
Abstract
"Soil arching", as the major medium of load transfer for a piled embankment, has significant influences on the behaviors of load transfer and of embankment fill displacements. Based on the laboratory model tests, a series of numerical models by discrete element method (DEM) are established with the particle flow code PFC2D to investigate the features and evolution of "soil arching" by analyzing the distribution of principal stress direction, contact force chains and embankment fill settlements. The numerical results indicate that the "soil arching" develops gradually with the increase of pile-soil relative displacement and maintains a relatively stable state finally. Meanwhile the relatively stable "soil arching" is roughly parabola-shaped with a height of 0.8 times the clear spacing of cap beam. Additionally, the embankment height has significant influences on the features and evolution of "soil arching", as well as the load-transfer efficacy. However, the roughness of embankment fill, the clear spacing of cap beam and the width of cap beam have significant influences on the load-transfer efficacy, but not on the "soil arching" features.关键词
桩承式路堤/"土拱结构"/室内模型试验/数值模拟Key words
piled embankment/soil arching/laboratory model test/numerical simulation分类
建筑与水利引用本文复制引用
付海平,郑俊杰,赖汉江..桩承式路堤"土拱结构"形成演化规律离散元分析[J].岩土工程学报,2017,39(11):2050-2057,8.基金项目
国家自然科学基金项目(51278216) （51278216）
中国博士后科学基金项目(2016M600595) （2016M600595）
