土体参数对扩底墩竖向承载性状影响的数值分析  

Numerical Analysis of Vertical Bearing Behavior of Belled Pier Under Different Soil Parameters

作　　者：高广运[1] 张婧[1] 郭星宇[2] 

机构地区：[1]同济大学地下建筑与工程系 [2]上海岩土工程勘察设计院有限公司,上海200002

出　　处：《岩土工程技术》2007年第5期230-233,238,共5页Geotechnical Engineering Technique

基　　金：上海市重点学科建设项目44号资助项目(沪教委科[2001])

摘　　要：为了分析不同土体参数对扩底墩竖向承载性状的影响,利用有限单元法,建立了均匀地基中不同土体模量、内摩擦角、粘聚力的三维有限元模型,模拟分析了土体模量、内摩擦角和粘聚力变化时扩底墩的竖向承载性状。分析表明,扩底墩基础以端阻力为主,土体模量和内摩擦角对其竖向承载性状的影响较大,粘聚力影响较小。因此扩底墩持力层应选择土体模量和内摩擦角大的坚硬土层。3D finite element models of belled pier in the homogeneous stratum with different elastic modulus of soils, angle of internal friction and cohesion force. The vertical bearing behaviors of belled pier are analyzed when the variations of the above soil parameters are presented. The analysis shows that the ultimate bearing capacity is mainly composed of the tip resistance of belled pier. The soil modulus and the angle of internal friction can affect the pier vertical bearing behaviors greatly. And the affection of the cohesion is not notable. Thus the stiff stratum with great amount of soil modulus and the angle of internal friction should be chosen as the pier bearing stratum.

关 键 词：扩底墩 竖向承载性状 三维有限元模型 数值模拟 土体参数 

分 类 号：TU745.5[建筑科学—建筑技术科学]