-
摘要: 为了分析列车速度对无碴轨道路基动力影响, 采用层状体系理论, 结合有限元方法, 建立无碴轨道路基层状有限元模型, 考虑了列车荷载的不同速度对基床表层振动加速度、竖向动位移、动应力及其横向分布等路基动力特性的影响, 研究了无碴轨道路基荷载作用下的力学行为。结果表明: 列车速度对基床表层加速度的影响较大, 竖向加速度随荷载速度的提高而增大; 列车速度对基床表层动位移影响较小, 速度每提高20 km·h-1, 其值变化不大于0.05 mm; 路基表层动应力随列车速度的提高呈现一定的波动趋势。计算结果与实测结果相似, 证明了该模型的正确性。Abstract: In order to analyze the influence of train speed on the dynamic characteristics of ballastless track subgrade, a 3-D layer finite element model of the subgrade was establisbed by using layer system theory and finite element method, the different speed influences of train load on the vertical acceleration, vertical displacement, dynamic stress and its transverse distribution characteristics of the subgrade surface layer were considered, and the mechanical behaviors of the subgrade under train load were studied.It is observed that the vertical acceleration is obviously affected by train load speed, and the acceleration increases with train load speed raising; the dynamic displacement is little influenced by train load speed, and its change value is less than 0.05 mm when the speed increased by 20 km·h-1; the dynamic stress presents a fluctuate trend with train load speed increasing.The result is similar to actual measure result, and approves the correctness of the model.
-
Key words:
- high-speed railway /
- ballastless track /
- subgrade /
- finite element method /
- acceleration /
- dynamic stress /
- dynamic displacement
-
表 1 轨下基础材料参数
Table 1. Material parameters of track substructure
材料 E/MPa v ρ/(kg·m-3) 轨道板 3.6×104 0.30 2 600 CA砂浆 3.0×102 0.35 2 000 道床板 3.5×104 0.30 2 400 级配碎石 2.0×102 0.25 2 300 AB组填料 1.5×102 0.30 2 200 红层泥岩 1.0×102 0.30 2 100 地基 8.0×101 0.30 2 000 
下载: 导出CSV
表 2 轨下基础模型几何参数
Table 2. Geometric parameters of track substructure model
材料 H/m m 材料 h/m b/m l/m 级配碎石 0.7 1∶1.75 轨道板 0.19 2.4 9.91 AB组填料 2.3 CA砂浆 0.05 2.4 红层泥岩 3.0 道床板 0.30 3.2 地基 3.0 级配碎石 3.9
下载: 导出CSV
-
[1] Krylov V V. Calculation of low frequency ground vibration from rail way trains[J]. Applied Acoustics, 1994, 42(3): 199-213. doi: 10.1016/0003-682X(94)90109-0 [2] Krylov V V. Generation of ground vibration by superfast trains[J]. Applied Acoustics, 1995, 44(2): 149-164. doi: 10.1016/0003-682X(95)91370-I [3] Matsuura A. I mpulsive response of an elastic layered mediumin the anti-plane wave field based on a thin-layered elementand discrete wave number method[J]. Structural Engineering/Earthquake Engineering, 1993, 9(22): 119-128. [4] Matsuura A. Si mulation for analyzing direct derailment limit of running vehicle on oscillating tracks[J]. Structural Engineering/Earthquake Engineering, 1998, 15(1): 63-72. [5] Kaynia A M, Madshus C, Zackrisson P. Ground vibration from high speed trains: prediction and countermeasure[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2000, 126(6): 531-537. doi: 10.1061/(ASCE)1090-0241(2000)126:6(531) [6] Sheng Xiao-zhen, Jones C J C, Petyt M. Ground vibration generated by a harmonic load acting on a rail way track[J]. Journal of Sound and Vibration, 1999, 225(1): 3-28. doi: 10.1006/jsvi.1999.2232 [7] Sheng Xiao-zhen, Jones C J C, Petyt M. Ground vibration generated by a load moving along a rail way track[J]. Journalof Sound and Vibration, 1999, 228(1): 129-156. doi: 10.1006/jsvi.1999.2406 [8] Sheng Xiao-zhen, Jones C J C, Petyt M. Si mulation ofground vibration from a moving harmonic load on a rail waytrack[J]. Journal of Sound and Vibration, 2000, 231(3): 739-751. doi: 10.1006/jsvi.1999.2559 [9] 王常晶, 陈云敏. 列车荷载在地基中引起的应力响应分析[J]. 岩石力学与工程学报, 2005, 24(7): 1 178-1 187. doi: 10.3321/j.issn:1000-6915.2005.07.016Wang Chang-jing, Chen Yun-min. Analysis of stresses intrain-induced ground[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(7): 1 178-1 187. (in Chinese) doi: 10.3321/j.issn:1000-6915.2005.07.016 [10] 李军世, 李克钏. 高速铁路路基动力反应的有限元分析[J]. 铁道学报, 1995, 17(1): 66-75. https://www.cnki.com.cn/Article/CJFDTOTAL-TDXB501.009.htmLi Jun-shi, Li Ke-chuan. Finite element analysis for dynamic response of roadbed of high-speed rail way[J]. Journal of theChina Rail way Society, 1995, 17(1): 66-75. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-TDXB501.009.htm [11] Jenkins H H, Stephenson J E, Clayton G A, et al. Theeffect of track and vehicle parameters on wheel/rail vertical dynamic forces[J]. Rail way Engineering Journal, 1974, 3(1): 2-16. [12] 蔡成标, 翟婉明, 王开云. 遂渝线路基板式轨道动力性能计算及评估分析[J]. 中国铁道科学, 2006, 28(4): 18-21. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGTK200604004.htmCai Cheng-biao, Zhai Wan-ming, Wang Kai-yun. Calculation and assessment analysis of the dynamic performance for slabtrack on Sui-Yu rail way[J]. China Rail way Science, 2006, 28(4): 18-21. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGTK200604004.htm [13] 蔡成标, 翟婉明, 赵铁军, 等. 列车通过路桥过渡段时的动力作用研究[J]. 交通运输工程学报, 2001, 1(1): 17-19. http://transport.chd.edu.cn/article/id/200101004Cai Cheng-biao, Zhai Wan-ming, Zhao Tie-jun, et al. Research on dynamic interaction of train and track on roadbed-bridge transition section[J]. Journal of Traffic and Transportation Engineering, 2001, 1(1): 17-19. (in Chinese) http://transport.chd.edu.cn/article/id/200101004 [14] 王开云, 刘建新, 翟婉明, 等. 铁路行车安全及舒适性仿真[J]. 交通运输工程学报, 2006, 6(3): 9-12. http://transport.chd.edu.cn/article/id/200603003Wang Kai-yun, Liu Jian-xin, Zhai Wan-ming, et al. Running safety and comfortability si mulation of railway[J]. Journal of Traffic and Transportation Engineering, 2006, 6(3): 9-12. (in Chinese) http://transport.chd.edu.cn/article/id/200603003 [15] 和振兴, 翟婉明. 板式轨道交通引起的地面振动模型[J]. 交通运输工程学报, 2006, 6(3): 13-17. http://transport.chd.edu.cn/article/id/200603004He Zhen-xing, Zhai Wan-ming. Model of ground vibration generated by slab track[J]. Journal of Traffic and Transportation Engineering, 2006, 6(3): 13-17. (in Chinese) http://transport.chd.edu.cn/article/id/200603004 [16] 王其昌. 高速铁路土木工程[M]. 成都: 西南交通大学出版社, 1999. -
点击查看大图
图(11) / 表(2)
计量
- 文章访问数: 263
- HTML全文浏览量: 62
- PDF下载量: 255
- 被引次数: 0
