扩底桩上拔土体破坏形态分析  

Failure form analysis for soils mass around enlarged base piles

作　　者：杨智峰 赵玉成[1,2] 冯怀平 贾康琪[1,2] 李占岭 赵怀宇[3] YANG Zhifeng;ZHAO Yucheng;FENG Huaiping;JIA Kangqi;LI Zhanling;ZHAO Huaiyu(School of Traffic and Transportation,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control,Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Hebei Electric Power Survey & Design Institute,Shijiazhuang 050031,China)

机构地区：[1]石家庄铁道大学交通运输学院,石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障教育部重点实验室,石家庄050043 [3]河北省电力勘测设计院,石家庄050031

出　　处：《中国科技论文》2018年第19期2189-2194,共6页China Sciencepaper

基　　金：国家自然科学基金资助项目(51478279);河北自然科学基金资助项目(E2017210186)

摘　　要：对扩底抗拔短桩做静载荷试验分析,得到其具有整体剪切破坏的形式。同时,对扩底抗拔桩做了有限元法分析,结果表明,桩的极限承载力与桩长L成正比,并且随着桩长L增加,存在着一定变化规律的破坏形式,即整体剪切-内缩式局部剪切-稳定态局部剪切。The whole shear failure form of the short piles with the enlarged bottom was obtained through the analysis of the static load tests.Through the finite element analysis of uplift piles with the enlarged bottom,it was concluded that the ultimate bearing capacity of the pile was directly proportional to the length of pile L.With the increase of pile length L,there existed a certain regularly change of failure form,which included the global slip-shear failure,the contracting inword shear failure,and the stably local shear failure.

关 键 词：扩底桩 数值分析 破坏形态 临界深度 

分 类 号：U451[建筑科学—桥梁与隧道工程]