岩土力学Issue(11)：3252-3258,7.DOI:10.16285/j.rsm.2015.11.029
循环荷载下低填方桩承式路堤动力响应分析
Dynamic response analysis of a low-filled piled embankment under cyclic loading
摘要
Abstract
The dynamic response of a low-filled piled embankment under traffic loading is closely related to its bearing capacity and stability. In this study, a series of discrete element numerical models of piled embankments is established by using PFC2D based on the previous indoor model tests. The microscopic parameters of embankment filling and soil between piles adopted in the discrete element model are calibrated by numerical biaxial tests and uniaxial compression tests, respectively. Meanwhile, the validity and feasibility of the discrete element model are verified by comparison of load-transfer efficacy between the discrete element results and experimental data. Then, a cyclic loading in an ideal sinusoidal wave is applied to the surface of a low-filled piled embankment, and the analyses of load-transfer efficacy, distribution of contact force and embankment settlement are performed in detail. Numerical simulation results indicate that the bearing capacity of soil arching in a low-filled embankment would be gradually weakening firstly under the cyclic loading and reach a steady state finally. Specifically, the weakening of soil arching performs as the decreases of the load-transfer efficacy in macroscopic and the difference between the contact forces upon piles and soil between piles in microscopic. Meanwhile, the weakening of soil arching would result in the aggravation of differential settlement on embankment surface.关键词
低填方路堤/循环荷载/动力响应/离散元/土拱效应Key words
low-filled embankment/cyclic loading/dynamic response/discrete elements/soil arching effect分类
交通工程引用本文复制引用
赖汉江,郑俊杰,崔明娟..循环荷载下低填方桩承式路堤动力响应分析[J].岩土力学,2015,(11):3252-3258,7.基金项目
国家自然科学基金项目（No.51278216，No.51478201）。@@@@Project supported by the National Natural Science Foundation of China (Grant Nos.51278216 and 51478201) （Grant Nos.51278216 and 51478201）
