(1.四川建筑职业技术学院，德阳 618000；2.四川大学建筑与环境学院，成都 610065)
［提要］根据大直径扩底桩桩顶处的静力平衡条件和变形协调条件，建立了考虑承台效应时计算大直径扩底桩沉降变形的公式。对某教学楼基础工程的29根桩是否考虑承台效应分别进行了沉降变形计算，并将计算结果进行对比分析，结果表明，若桩基承台底面与地基土紧密接触，承台效应对大直径扩底桩沉降变形的影响不容忽略；地基土的压缩模量越大，承台效应越显著。
［关键词］承台效应；大直径；扩底桩；沉降变形；影响分析
Analysis of Bearing Platform Effect on Settlement of Big Diameter Extendedbottom Pile/Xia Jianzhong1,Zhang Xinpei2(1 Sichuan College of Architecture Technology,Deyang 618000,China;2 Architecture and Environmental Institute,Sichuan University,Chengdu 610065,China)
Abstract:Based on the static equilibrium and deformation coordination condition of the big diameter extendedbottom pile,the formula for calculating the settlement of big diameter extendedbottom pile with the bearing platform effect,is put forward.29 piles of a teaching building with and without the bearing platform effect are calculated.The results are compared and  show that the effect of bearing platform on the settlement of big diameter extendedbottom pile can not be neglected if the bottom surface contacts the ground soil tightly,and larger the compression module of the ground soilis,more remarkable the effectis.
Keywords:bearing platform effect; big diameter; extendedbottom pile; settlement; influence analysis