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| DEM analysis of accumulated settlement characteristics of railway ballast bed under dynamic load with various frequencies |
| Received:May 13, 2019 Revised:June 04, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20190513001 |
| KeyWord:ballast bed discrete element method accumulated settlement loading frequency GPU-based parallel computation |
| Author | Institution |
| 李勇俊 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
| 严颖 |
大连交通大学 土木工程学院, 大连 |
| 季顺迎 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
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| Abstract: |
| To investigate the characteristics of the accumulated settlement of a railway ballast bed under high-frequency load,the discrete element method (DEM) of a sleeper-ballast bed with engineering scale was established using the GPU high performance parallel computing algorithm.Considering the real irregular geometry morphology,the ballast particles are constructed with unbreakable clustered spheres.In the frequency interval of 10Hz~100Hz,the dynamic characteristics of the ballast bed were analyzed and compared with the vertical displacement of the sleepers,as well as the movement distribution and vibration response of ballast in vertical and transverse directions.The simulation results show that the ballast accumulated deformation gradually increases with the increase of load frequency if it is lower than 60Hz.The ballast accumulated deformation increases rapidly with the increase of load frequency if it is greater than 60Hz,and reaches the maximum if the load frequency is 80Hz.After that,the ballast accumulated deformation decreases gradually along with the increases of load frequency.Moreover,physical quantities,such as the velocity field of the ballast bed,acceleration of ballast particles at different positions are compared at different frequencies.It shows strong vibration occurs on the DEM model of the ballast bed when the load frequency is close to 80Hz. |
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