摘要
通过建立平面应变条件下桩承式加筋路堤土拱形态分析的弹塑性有限元模型,对桩承式加筋路堤中的土拱形态进行有限元数值模拟,并分析加筋对桩帽-土荷载分担特性的影响。计算结果表明:平面应变条件下桩承式加筋路堤中的土拱形态为半椭圆,土拱高度小于无筋桩承式路堤。土拱高度随路堤高度的增大先增高后稳定不变。加筋刚度对土拱高度的影响较小。加筋将桩间土承担的路堤荷载向桩帽上转移。由加筋传递到桩帽上的竖向应力随桩间距和加筋刚度的增大而增大,随桩帽宽度的增大而减小。
A two dimensional elastic-plastic finite element model which could be used to simulate the formation process of soil arch in a reinforced piled embankment was established. The shape of soil arch was simulated numerically by FEM, and effect of the reinforcement on the embankment load transferring from surrounding soil to pile cap was investigated. The results indicated that the shape of soil arch in a reinforced piled embankment was semi- elliptic under the condition of plane strain. The height of soil arch in the reinforced piled embankment was lower than that in the piled embankment without reinforcement. The height of soil arch increased firstly with increasing the embankment height, and then kept constant when the embankment height was larger than its critical value. The height of soil arch was few influenced by the stiffness of reinforcement. The embankment load shared by surrounding soil could be transferred to the pile cap through the reinforcement. The vertical stress transferred to pile cap from surrounding soil through the reinforcement increased with an increase in pile spacing and stiffness of the reinforcement, but decreased with increasing the width of pile cap.
出处
《工业建筑》
CSCD
北大核心
2016年第8期104-108,共5页
Industrial Construction
基金
广东省交通运输厅科技项目(201102021)
上海理工大学国家级项目培育项目(16HJPY-MSO3)
