地震作用下刚性桩复合地基支承路堤破坏机理研究  

RESEARCH ON FAILURE MECHANISMS OF EMBANKMENTS REINFORCED WITH RIGID PILES UNDER THE ACTION OF SEISMIC LOADS

作　　者：刁钰[1,2] 杨超[1,2] 薛铖 赵玉波 杜一鸣 DIAO Yu;YANG Chao;XUE Cheng;ZHAO Yubo;DU Yiming(Key Laboratory of Coast Civil Structure Safety of Ministry of Education,Tianjin University,Tianjin 300072,China;Department of Civil Engineering,Tianjin University,Tianjin 300072,China;China Construction Sixth Engineering Division Corp.,Ltd.,CSCEC,Tianjin 300451,China)

机构地区：[1]滨海土木工程结构与安全教育部重点实验室,天津300072 [2]天津大学土木工程系,天津300072 [3]中国建筑第六工程局有限公司,天津300451

出　　处：《工业建筑》2020年第10期94-100,10,共8页Industrial Construction

基　　金：国家重点研发计划项目(2016YFC0802008);天津市自然科学基金项目(19JCYBJC22200);国家自然科学基金重点项目(41630641)。

摘　　要：在地震荷载下,软土地区的刚性桩复合地基支承路堤更易发生弯曲破坏,导致整体失稳破坏等严重后果。通过采用非连续布局优化(DLO)上限分析方法模拟地震作用下桩土的相互作用和路基破坏,研究不同桩数、桩端嵌固情况、加强桩数目及加强桩位置等条件下刚性桩复合地基支承路堤在地震作用下的极限受力性状、破坏模式以及路堤的失稳破坏机理。数值模拟结果表明:数值分析结果与模型试验结果相似;在同一地震加速度作用下,桩身弯矩随着距路堤中心距离的减小而逐渐减小;路堤下复合地基的刚性桩体更容易发生弯曲破坏,且桩体之间存在连续破坏现象。It′s more prone to bending damage for the embankment supported with rigid pile composite foundation in soft soil areas under the action of seismic loads,even leading to serious damage and other serious consequences.The pile-soil interaction and the subgrade failure under the action of seismic loads were simulated by the discontinuous layout optimization(DLO)method.Also,the characteristics of deformation and load transfer between piles and soil and failure mechanisms of the piles and embankment were studied with different quantities and embeded depths of piles,and different quantities or distribution of higher stiffness piles.The results showed that the numerical results were similar to the ones of the model test.Under the action of the same seismic loads,the closer the piles to the center of the embankment was,the lower the bending moment of piles was.The bending failure of piles appeared more easily than shear failure.Under the seismic action,progressive failure would occur more easily between piles below embankments.

关 键 词：刚性桩复合地基 地震作用破坏机理 非连续布局优化方法 

分 类 号：U416.12[交通运输工程—道路与铁道工程]