doi:10.16186/j.cnki.1673-9787.2023020075

Received:2023-02-27

Revised:2023-04-18

Online Date: 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