摘要
桩周大面积堆载产生的土体变形不仅会引起桩身负摩阻力,也会使桩基承受较大的侧向荷载。文章应用三维有限元方法对桩侧堆载作用下的被动桩受力性状进行了分析,并研究了桩顶荷载对被动桩受力变形的影响。在桩侧堆载的作用下,桩身产生了较大的侧向位移与弯矩,同时出现负摩阻力和桩身轴力。桩身侧移和桩身轴力随着堆载距离的增加而减小,随着堆载量的增加而增大。桩侧堆载的被动桩在桩顶竖向荷载作用下会产生桩身二次弯矩,加剧桩身弯曲变形和内力。
The soil deformation due to large surcharge load adjacent to the piles can cause negative skin friction and lateral load of the pile.In this Paper,a 3D-FEM is used to analyze the behavior of the passive pile which is affected by adjacent surcharge load and vertical load on pile top.The adjacent surcharge load can cause large lateral displacement,bending moment,negative skin friction and axial force.The lateral displacement and axial force are decreased with increasing distance and decrease of the surcharge load.The load on the top of passive pile causes an additional bending moment,and aggravates the existing deflection and internal force of the pile.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第3期467-471,共5页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金项目(50679041)
关键词
堆载
被动桩
桩顶荷载
二次弯矩
surcharge load
passive pile
load on pile top
additional bending moment
