高周次列车荷载作用下桩网结构路基桩土应力比计算方法及特性研究  

Calculation Method and Characteristics of Pile-soil Stress Ratio of Pile-net Supported Embankment under High-cyclic Train Loading

作　　者：李晖[1,2] 毕宗琦[3,4] 黄建丹 宫全美 王炳龙[1,2] LI Hui;BI Zongqi;HUANG Jiandan;GONG Quanmei;WANG Binglong(Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety,Tongji University,Shanghai 201804,China;Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Shanghai 201804,China;State Key Laboratory for Track Technology of High-speed Railway,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Beijing Tieke Specical Engineering Technology Corporation Limited,Beijing 100081,China;Shanghai Urban Construction Design&Research Institute(Group)Company Limited,Shanghai 200125,China)

机构地区：[1]同济大学上海市轨道交通结构耐久与系统安全重点实验室,上海201804 [2]道路与交通工程教育部重点实验室,上海201804 [3]中国铁道科学研究院集团有限公司高速铁路轨道技术国家重点实验室,北京100081 [4]北京铁科特种工程技术有限公司,北京100081 [5]上海市城市建设设计研究总院(集团)有限公司,上海200125

出　　处：《铁道学报》2021年第2期152-159,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(51978523,51778485)。

摘　　要：为满足桩网结构路基承载性能设计及其长期服役稳定性预测的需要,基于HCA模型,借助Abaqus有限元平台的二次开发实现了显隐式转换计算方法,并通过现场测试数据进行验证。利用该算法,研究了高周次列车荷载作用下动荷载作用次数、幅值等因素对高速铁路桩网结构路基中桩土应力比的影响。结果表明:高周次动载影响下,桩土应力比随振次的增加呈现先减小后趋于稳定的规律,伴随着桩顶上方应力集中区域减小、竖向应力分叉点下移,其影响范围自混凝土底座外3 m以1∶1的坡度向下扩散;动荷载幅值影响着桩土应力比随循环次数的变化规律,动静荷载比大于1.67时,桩土应力比迅速减小至土拱效应消失,动静荷载比小于0.33时桩土应力比保持稳定。In order to meet the needs of bearing performance design and long-term service stability prediction of pile-net supported embankment,an implicit-explicit method,based on the HCA model,has been implemented by the further development of ABAQUS,which is verified by field test data.Under high-cyclic loading,the influence of dynamic load frequency and amplitude on the pile-soil stress ratio in pile-net supported embankment was studied based on the proposed method.The results show that under the influence of high-cyclic loading,the pile-soil stress ratio decreases first and then remains stable with the increase of cyclic times.With the decrease of the stress concentration area above the pile top and the downward movement of the vertical stress bifurcation point,the influence range diffuses downward from 3 m outside the concrete base with a slope of 1∶1.The dynamic load amplitude affects the variation law of the pile-soil stress ratio with the cyclic times.When the dynamic-static load ratio is greater than 1.67,the pile-soil stress ratio decreases rapidly to 1 which means the disappearance of the soil arching effect.At the dynamic-static load ratio of less than 0.33,the pile-soil stress ratio remains stable.

关 键 词：桩网结构路基 桩土应力比 高周次列车荷载 显隐式转换 数值分析 

分 类 号：U213.1[交通运输工程—道路与铁道工程]