岩土力学Issue(z2)：428-432,438,6.
现浇X形桩桩承式加筋路堤三维有限元分析
Three-dimensional finite element analysis of geogrid-reinforced embankment supported by X-section cast-in-place piles
摘要
Abstract
Geogrid-reinforced and pile-supported expressway embankment has been widely applied to soft ground improvement;but its bearing and deformation mechanism has not been deeply understood. Combining with the Fourth Yangtze River Bridge’s north-line soft ground reinforced project in Nanjing, the numerical method is used to analyze the variations of settlement and stress of pile and soil, pile axial force and excess pore water stress. The results show that road embankment load is mainly borne by piles as a result of the soil arching effect. The soil pressures of pile and soil increase with the development of embankment load firstly;and then the pressure of pile continue to increase while the pressure of soil decreases in the consolidation process of soft soil. The pile axial force increases quickly during the process of filling. Negative skin friction develops along most part of X-section cast-in-place pile shaft;and the neutral point ascends firstly;with the consolidation of soil, the depth of the neutral point becomes deeper;then the neutral point position is unaltered at the end of soil consolidation.关键词
现浇X形桩/桩承式加筋路堤/三维有限元分析/负摩阻力/中性点Key words
X-section cast-in-place pile/pile-supported reinforced embankment/3D finite element analysis/negative skin friction/neutral point分类
建筑与水利引用本文复制引用
陈力恺,孔纲强,刘汉龙,金辉..现浇X形桩桩承式加筋路堤三维有限元分析[J].岩土力学,2013,(z2):428-432,438,6.基金项目
国家自然科学基金项目（No.51008116，No.51278170）；国家自然科学基金高铁联合基金项目（No.U1134207）。 （）
