Analysis of dynamic response law of elastic support block rail structure with large adjustment on flat curve
Based on the vehicle-track coupling dynamics and finite element theory,ABAQUS®-MATLAB® co-simulation was introduced to establish the vehicle-rail-elastic support block type ballastless track coupled dynamics model,the dynamic response characteristics of elastic support block type ballastless track with large adjustment under various horizontal curve conditions for different vehicle types were studied,and the applicability and feasibility of elastic support block type ballastless track for horizontal curve conditions were analyzed and evaluated.The results show that the adjustment of the height of the under-rail pad has a greater impact on various indicators than the adjustment of the height of the support block brim.When the height increases from-60 mm to 60 mm,the increase in gauge expansion reaches 235.00%,and there is a significant change in gauge expansion,only when the pad height is lowered or raised.With the decrease of curve radius,indicators such as gauge expansion,driving safety,and stability also increase.A small radius of the curve has a significant impact on the gauge retention ability of the support block.When the radius decreases to 2 800 m,the gauge expansion increases by 67.50%compared to that of a radius of 5 000 m.Compared to passenger trains,when the freight train reaches a small radius curve section,there is a significant increasing trend in gauge expansion,in the same operating conditions of the truck's gauge expansion compared to the passenger car,the increase reaches 110.45%.Overall,with different curve radii and support block height adjustments,all safety and stability indicators of train operation,as well as gauge expansion,are within the limits specified in the standard,and the track geometry has a good ability to maintain.In practical engineering,when trains,especially freight trains,pass through small curve radius sections,the driving speed should be reduced as much as possible to avoid hidden dangers such as affecting driving safety and stability caused by difficult sections.
co-simulationelastic support block type ballastless trackflat curvemixed passenger and freight railway
闫斌、金浩然、杜香刚、徐磊、盘柳
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中南大学土木工程学院,湖南长沙,410075
中国铁道科学研究院集团有限公司铁道建筑研究所,北京,100081
高速铁路轨道系统国家重点实验室,北京,100081
联合仿真 弹性支承块式无砟轨道 平曲线 客货共线
国家自然科学基金资助项目国家自然科学基金资助项目湖南省自然科学基金资助项目中国国家铁路集团有限公司科技研究开发计划项目中国中铁重大项目中国铁道科学研 究院集团有限公司科研项目Science and Technology Research and Development Program of China National Railway Group Co.,LtdResearch Project of China Academy of Railway Sciences Co.,Ltd.
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