| 新型钢枕轨道结构受力特性影响因素分析 |
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| 引用本文： | 张鹏飞,朱勇,雷晓燕.新型钢枕轨道结构受力特性影响因素分析[J].铁道标准设计通讯,2019(9):1-5. |
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| 作者姓名： | 张鹏飞 朱勇 雷晓燕 |
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| 作者单位： | 华东交通大学铁路环境振动与噪声教育部工程研究中心 |
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| 摘 要： | 针对轨道过渡段基础沉降引起的轨道不平顺问题,提出一种能够自动补偿基础沉降的新型钢枕。为研究新型钢枕轨道结构参数对轨道结构受力特性的影响,基于有限元法,建立新型钢枕轨道-路基空间耦合模型,分析轨下胶垫刚度、钢枕间距以及道床弹性模量等参数对钢枕轨道结构受力特性的影响规律。研究结果表明:轨下胶垫刚度对钢轨受力特性的影响最为显著,随着轨下胶垫刚度的增大,钢轨的受力与变形均随之减小,但同时钢枕、道床和路基的受力与变形有所增大;减小钢枕间距能够减小轨道结构受力与变形,但钢枕间距太小会加大对道砟捣固的作业难度,增加养护维修工作量和维修成本;增大道床弹性模量可以减小轨道结构变形,但同时增大了钢枕和道床的受力。建议对轨下胶垫刚度、钢枕间距和道床弹性模量等参数综合考虑后合理选取。
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| 关 键 词： | 钢枕 有砟轨道 轨道结构 受力特性 轨道参数 有限元法 |
Analysis of Influence Factors on Mechanical Characteristics of New Steel Sleeper Track Structure |
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| Affiliation: | ,Engineering Research Center of Railway Environment Vibration and Noise, Ministry of Education,East China Jiaotong University |
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| Abstract: | Aiming at the track irregularity problem caused by the foundation settlement of track transition section, a new kind of steel sleeper that can automatically compensate the foundation settlement is proposed. In order to study the influence of the track structure's parameters on the mechanical characteristics of the new steel sleeper track structure, a track-subgrade space coupling model of the new steel sleeper is established based on the finite element method, and the influences of the track parameters such as rail pad stiffness, steel sleeper spacing and elastic modulus of ballast bed on the mechanical characteristics of the steel sleeper track structure are analyzed. Results show that rail pad stiffness has the most significant influence on the mechanical characteristics of the rail; with the increase of the rail pad stiffness, the stress and deformation of the rail are reduced, but the stress and deformation of the steel sleeper, ballast bed and subgrade are increased. Reducing the spacing of the steel sleeper can help reduce the stress and deformation of the track structure, but too small spacing of steel sleeper will make it more difficult to tamp railway ballast, and increase the maintenance workload and costs. Increasing the elastic modulus of the ballast bed can help reduce the deformation of the track structure, but, at the same time, it will increase the stress of the steel sleeper and the ballast bed. It is recommended that track parameters such as rail pad stiffness, steel sleeper spacing and elastic modulus of ballast bed should be chosen rationally after comprehensive consideration. |
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| Keywords: | steel sleeper ballast track track structure mechanical characteristics track parameters finite element method |
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