任连伟, 王自强, 邹友峰,等.采空区场地高速铁路路基动力响应离散元数值模拟分析[J].河南理工大学学报（自然科学版）,doi:10.16186/j.cnki.1673-9787.2023020075

REN L W, WANG Z Q, ZOU Y F, et al.Discrete element numerical simulation analysis of dynamic response of high-speedrailway subgrade in goaf site[J].Journal of Henan Polytechnic University(Natural Science) ,doi:10.16186/j.cnki.1673-9787.2023020075

采空区场地高速铁路路基动力响应离散元数值模拟分析(网络首发)

任连伟1,2, 王自强1, 邹友峰3, 顿志林1,2, 杨文府4

1.河南理工大学 土木工程学院，河南 焦作  454000;2.河南省采空区场地生态修复与建设技术工程研究中心，河南 焦作  454000;3.河南 理工大学 测绘与国土信息工程学院，河南 焦作  454000;4.山西省煤炭地质物探测绘院有限公司，山西 晋中  030600

摘要:高速铁路穿越采空区场地存在重大安全隐患，为探讨采空区场地高速铁路路基的动力响 应规律，利用3DEC离散元软件建立了采空区场地高速铁路路基数值模型，分析了列车荷载作 用下路基内部的沉降变形和动应力分布规律。结果表明：与无砟轨道相比，有砟轨道路基内部 的动应力幅值明显更高，且拥有更快的衰减速率；动应力、动位移的时程曲线会随着深度的增 加出现逐渐增大的相位差；动位移幅值会随着荷载作用时间增加而逐渐增大，但增大的速度会 不断降低，而动应力幅值则基本保持不变；动应力、动位移幅值与列车轴重存在着明显的线性 关系，随着轴重的增加而线性增大。研究结果可为采空区场地高速铁路的安全运行提供参考。 关 键 词：采空区场地；高速铁路路基；动应力；动位移；离散元

关键词: 采空区场地；高速铁路路基；动应力；动位移；离散元

中图分类号：TU470

 doi:10.16186/j.cnki.1673-9787.2023020075

基金项目:国家自然科学基金资助项目（U1810203）

收稿日期:2023-02-27

修回日期:2023-04-18

网络首发日期: 2023-09-26

Discrete element numerical simulation analysis of dynamic response of high-speedrailway subgrade in goaf site（Online）

REN Lianwei1,2, WANG Ziqiang1, ZOU Youfeng3, DUN Zhilin1,2, YANG Wenfu4

1.School of Civil Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.State Collaborative Innovation Center of Coal Work Safety and Clean-Efficiency Utilization， Jiaozuo  454000，Henan，China;3.School of Surveying and Land Information Engineering，Henan Polytechnic University， Jiaozuo  454000，Henan，China;4.Coal Geological Geophysical Exploration Surveying & Mapping Institute of Shanxi Province， Jinzhong  030600，Shanxi，China

Abstract:The high-speed railway running through the goaf site has serious security risks. In order to study the dynamic response law of high-speed railway subgrade in goaf site，the numerical model of high-speed railway subgrade in goaf site was established by 3DEC discrete element software. The distribution law of settlement deformation and dynamic stress in subgrade under train load is analyzed. The results show that， compared with the ballastless track，the dynamic stress amplitude of the ballastless track subgrade is obviously higher，and the attenuation rate is faster. With the increase of depth，the phase difference of dynamic stress and dynamic displacement time history curve increases gradually. With the increase of loading time， the amplitude of dynamic displacement increases gradually，but the increasing speed decreases continuously. And the dynamic stress amplitude remains basically unchanged. The linear relation exists between dynamic stress，dynamic displacement amplitude and axle load of train，which increases linearly with the increase of axle load. The research results can be used as reference for the safe operation of high-speed railway in goaf site.

Key words:goaf site;high-speed railway subgrade;dynamic stressdynamic displacementdiscrete element

CLC：TU470