软土地区铁路桥大直径群桩基础的大型厚承台设计实践  

Design and Practice of Large-scale Thick Pile Cap with Large-diameter Pile Group Foundation of Railway Bridges in the Soft Soil Area

作　　者：陈亮[1] 

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《交通科技》2015年第3期19-21,共3页Transportation Science & Technology

摘　　要：针对软土地区铁路桥大直径超长群桩基础,以甬江铁路桥为背景,采用有限元数值分析(三维实体模型)、撑杆-系杆体系、梁式体系3种计算方法对超大桩头力、不等长桩的铁路桥梁大型厚承台进行计算。结果表明,不等长桩的大型厚承台在强大荷载作用下,基础位移及基础变位所致塔顶位移均不显著,而承台底面主拉应力较大,需作配筋设计和验算。As for the super-long large-diameter pile group foundation of railway bridges in the soft soil area,based on the background of Yongj iang Railway Bridge,three methods including three-dimen-sional finite element method （3D FEM）,strut-tie system and beam system were adopted to calculate the working performance of railway large-scale thick pile cap with unequal-length piles and huge forces on the pile heads in this paper.As to the thick pile cap with unequal-length piles,the results show that the deformations of the foundation and the displacements on the top of the towers are all non-sig-nificant,and the principal tensile stress on the bottom of the pile cap is great which means that rein-forcement design and calculation should be accomplished.

关 键 词：软土地区 铁路桥 群桩基础 大直径桩 超长桩 不等长桩 大型厚承台 设计与计算 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]