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），2024，43（2）：155-165.

REN L W，WANG Z Q，ZOU Y F，et al.Discrete element numerical simulation analysis of dynamic response of high-speed railway subgrade in goaf sites［J］.Journal of Henan Polytechnic University（Natural Science），2024，43（2）：158-168.

采空区场地高速铁路路基动力响应离散元数值模拟分析

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: 目的 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，方法 利用3DEC离散元软件建立17组采空区场地高速铁路路基数值模型，分析不同列车荷载作用下路基内部的沉降变形和动应力分布规律，对比分析无砟轨道和有砟轨道路基内部动力响应的分布差异，分析采空区开采宽度、厚度对动力响应分布规律的影响。结果 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，但其动应力的衰减速率也更高；动应力、动位移的时程曲线沿着路基深度方向出现不断增大的相位差；路基内部动位移幅值随着荷载作用时间增加而逐渐增大，但增大的速度不断降低，动应力幅值基本保持不变；动应力、动位移幅值与列车轴重存在明显的线性关系，随着轴重增加而线性增大；采空区开采宽度、厚度越大，列车荷载造成的动位移幅值也越大，但当开采宽度大于一定数值后，动位移幅值反而出现减小趋势。结论 列车荷载、路基轨道类型和采空区场地的差异都会对路基内部的动力响应分布情况产生影响，研究结果可为采空区场地高速铁路的安全运行提供理论参考。

关键词: 采空区场地；高速铁路路基；动应力；动位移；离散元

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

出版日期:2024/03/25

Discrete element numerical simulation analysis of dynamic response of high-speed railway subgrade in goaf sites

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.Henan Engineering Research Center for Ecological Restoration and Construction Technology of Goaf Sites；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: Objectives High-speed railways running through goaf sites pose serious security risks. In order to study the dynamic response law of high-speed railway subgrade in goaf sites. Methods The numerical model of 17 groups of high-speed railway subgrade in goaf sites was established by 3DEC discrete element software.The distribution law of settlement deformation and dynamic stress in subgrade under different train loads was analyzed.The difference in dynamic response distribution between ballasted track and ballastless track subgrade was compared and analyzed.The influence of width and thickness of goaf on dynamic response distribution was analyzed. Results Compared with the ballastless track，the dynamic stress amplitude of the ballasted track subgrade is noticeably higher，but the attenuation rate of dynamic stress is also higher.The time-history curve of dynamic stress and dynamic displacement will increase gradually along the depth direction of the subgrade.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 greater the width and thickness of the goaf，the greater the amplitude of the dynamic displacement caused by the train load， but when the mining width is greater than a certain range，the amplitude of the dynamic displacement will decrease. Conclusions The difference in train load，subgrade track type and goaf sites will affect the distribution of dynamic response in the subgrade.The research results can be used as reference for the safe operation of high-speed railways in goaf sites.

Key words:goaf site；high-speed railway subgrade；dynamic stress；dynamic displacement；discrete element