大直径扩底墩考虑尺寸效应竖向承载性状研究  

Effect of Dimensional Variation on Vertical Bearing Behavior of Large Diameter Belled Pier

作　　者：冯世进[1] 高广运[1] 郭星宇[1] 

机构地区：[1]同济大学地下建筑与工程系

出　　处：《地下空间与工程学报》2008年第5期840-846,共7页Chinese Journal of Underground Space and Engineering

基　　金：同济大学青年优秀人才培养行动计划资助项目(2006KJ044);上海市晨光计划资助项目(2007CG23)

摘　　要：为了分析不同尺寸条件下扩底墩的承载机理，利用三维有限元，建立墩土接触模型，分析不同墩身长度、扩底直径以及扩大头锅底高度时扩底墩的承载性状。对不同墩身长度下侧阻与端阻的发展过程，以及扩底墩墩身长度、扩底直径和锅底高度对承载力和墩底压力的影响进行了分析。可以发现，随着扩底直径的增加，扩底墩承载力明显提高，基本成线性关系；扩大头锅底高度的增加对扩底墩承载力影响较小，但可以减小墩底边缘的应力集中，锅底高度与墩底直径之比宜控制在0．2～0．3。In order to analyze the bearing mechanism of belled pier with different dimensions,by three-dimensional finite element, a contact model of pier and soil was established. The development processes of side friction and end resistance forces with different lengths of pier shaft were simulated, and the effects of length of pier shaft, pier end diameter and height of circular arc of the enlarged head on the bearing capacity and pressure under pier were analyzed. It is shown that the bearing capacity of belled pier almost increases linearly with the pier end diameter. Although the influence of the increment of height of circular arc of enlarged head on bearing capacity of belled pier is small, which can reduce the stress concentration around the edge of pier end, generally, the ratio of height of circular arc of enlarged head to pier end diameter chosen as 0.2-0.3 is reasonable.

关 键 词：扩底墩 三维有限元 承载特性 

分 类 号：TU47[建筑科学—结构工程]