交通载荷作用下桩侧土对桩的横向影响  

Under action of traffic load pile soil against pile lateral impact

作　　者：赵文华[1] 张彬[1] 张海荣[1] 陈小玮[1] 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000

出　　处：《辽宁工程技术大学学报（自然科学版）》2014年第1期71-75,共5页Journal of Liaoning Technical University (Natural Science)

基　　金：国家安监总局基金资助项目(05-05-079);辽宁省教育厅基金资助项目(L2011048)

摘　　要：为解决近桥台处的桩周土体在交通载荷作用下发生横向变形,导致桥梁上部结构发生失稳破坏问题,采用有限元分析和室内试验相互结合的方法,进行数组土体动弹模试验,得到在不同固结条件、不同载荷频率影响下的动应力、动应变关系,通过数值模拟分析了桩的弹性模量、桩长、桩径、土层等不同因素对桩土体系横向变形的影响.研究结果表明:桩长、桩径以及弹性模量的合理组合可达到桩的最大承载能力,同时在进行设计时也要考虑到桩土体系中土强度参数的影响.The soil around pile foundation of the bridge abutment makes lateral deformation under the influence of traffic load, which result in the bridge superstructure produce buckling failure. To solve this problem, this study mutually combined laboratory experiments with finite element analysis to process a digit group of dynamic strength tests and elastic modulus tests with the soil around pile foundation of the bridge abutment in Fuxin, and obtained the relation between dynamic stress and dynamic strain under different consolidation conditions and load frequency. The study further analyzed pile＇s elasticity modulus, length, diameter and other different factors＇ influence to the soil＇s lateral deformation. In conclusion, the rational combination of pile＇s length, diameter and elasticity modulus can make the pile reach the largest lifting capacity, and during the designing phase, the soil strength parameters need to be taken into consideration at the same time.

关 键 词：桥台 桩土体系 交通载荷 固结 桩基 动三轴试验 横向位移 有限元分析 

分 类 号：TU473.1[建筑科学—结构工程]