A sleeper-ballast-bedding surface coupled model was established with DEM to simulate the coupled action mechanism of ballast-ballast, ballast-sleeper, and ballast-bedding surface based on realistic appearance of ballast. The track structure loads-bearing characteristics, elastic and plastic deformation mechanism, and ballast bed/ bedding surface’s proportion under the condition of high-speed operation were studied deeply based on the model verified. The results showed that the track contact force shaped like a frustum is passed down, it extends below the syncline as a bevel; there are mutual invason phenomena of ballast-bedding surface, the proportion of ballast bed settlement is 83.9%~86.8%; track vertical elastic and plastic deformations and the proportion of ballast bed settlement increase nonlinearly with increase in train speed and train axle loads; the effects of train speed on track vertical deformation exceed those of train axle loads.
[1] 佐藤吉彦,周柔琴.新轨道破坏理论[J].铁道建筑, 1980,01:25-27.
[2] 平野雅之,周柔琴.采用新轨道破坏理论试算轨道下沉量 [J].铁道建筑,1981,06:31-36.
[3] 曾树谷.铁路散粒体道床[M].北京:中国铁道出版社,1997.
[4] 胡仁伟,王红,赵国堂.道碴动三轴试验研究[J].中国铁道科学,2001,22(2):101-106.
HU Ren-wei, WANG Hong, ZHAO Guo-tang. Study on Dynamic Triaxial Test and Accumulated Deformation of Ballast [J]. China Railway Science, 2001,22(2):101-106.
[5] 王红.道碴弹性与累积变形的试验研究[J].中国铁道科学,2001,22(6):106-110.
WANG Hong. Test and Study on Ballast Elasticity and Accumulated Deformation [J]. China Railway Science, 2001, 22(6):106-110.
[6] Mohammad Firuziaan, Otto von Estorffli. Simulation of The dynamic behaviour of bedding-foundation soil in The time domain [J]. System dynamics and long-term behaviour of railway vehicles, Track and subgrade. 2003,6:357-374.
[7] P. A. Ferreira, A. López-Pita. Numerical Modeling of High-Speed Train/Track System to Assess Track Vibrations and Settlement Prediction [J]. Journal of Transportation Engineering, 2013,139(3):330-337.
[8] 高建敏,翟婉明,徐涌.有碴轨道下沉变形参数影响分析[J].交通运输工程学报,2007,7(4):15-20.
GAO Jian-min, ZHAI Wan-ming, XU Yong. Analysis of Parameters' Effects on Settlement of Ballasted Track [J]. Journal of Traffic and Transportation Engineering, 2007,7(4): 15-20.
[9] 徐鹏,蔡成标.列车-有砟轨道-路基空间耦合动力学模型[J].工程力学,2011,28(3):191-197.
XU Peng, CAI Cheng-biao. Spatial Dynamic Model of Train-Ballast Track-Subgrade Coupled System[J]. Engineering Mechanics, 2011,28(3):191-197.
[10] 徐旸,高亮,杨国涛等.道砟颗粒的精细化建模及对道床力学性能影响[J].铁道学报,2014,36(9):73-78.
XU Yang, GAO Liang, YANG Guo-tao, et al. Fine Modelling of Ballast Grains and Influence on Mechanical Properties of Track Bed [J]. Journal of the China Railway Society, 2014,36 (9):73-78.
[11] 付龙龙,宫全美,周顺华等.列车荷载作用下有砟轨道轨面沉降与路基不均匀沉降间的相关关系[J].振动与冲击, 2013,32(14):23-28.
FU Long-long, GONG Quan-mei, ZHOU Shun-hua, et al. Relationships between ballasted track settlement and differential subgrade settlement under train load [J]. Journal of Vibration and Shock, 2013,32(14):23-28.
[12] 王平,万复光.铁路碎石道床弹性特性研究初探[J].铁道学报,1997,19(4):108-114.
WANG Ping, WAN Fu-guang. Research on the Elasticity of Ballast [J]. Journal of the China Railway Society, 1997,19(4): 108-114.
[13] 中华人民共和国铁道部. TB10621-2014高速铁路设计规范[S].北京:中国铁道出版社,2014.
[14] LIM W L. Mechanics of railway ballast behavior [D]. Nottingham: University of Nottingham.2004.
[15] M. Lu, G. R. McDowell. The importance of modelling ballast particle shape in the discrete element method [J]. Granular Matter,2007,9(1):69-80.
[16] Aursudkij B, G. R. McDowell, Collop A C. Cyclic loading of railway ballast under triaxial conditions and in a railway test facility [J]．Granular Matter, 2009(11): 391-401.
[17] USACE (U.S. Army Corps of Engineers) Railroad design and construction [M]. Track design manual, Washington, DC, 2000.
[18] Jeffs, Tew. A review of track design procedures: Sleepers and ballast [M]. Railways of Australia, Melbourne, Australia, 1991.
[19] Sun Q D, Indraratna B, Nimbalkar S. Deformation and Degradation Mechanisms of Railway Ballast under High Frequency Cyclic Loading[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2016,142(1).
[20] 董亮,赵成刚,蔡德钩等. 高速铁路路基的动力响应分析方法[J].工程力学,2008,25(11):231-240.
DONG Liang, ZHAO Cheng-gang, CAI De-gou, et al. Method for dynamic response of subgrade subjected to high-speed moving load[J]. Engineering Mechanics, 2008,25(11):231-240.
