列车荷载在高速铁路路基中传递规律研究

研究目的:为了进一步优化高速铁路路基结构、路基填料及各结构层的压实标准,采用有限元方法分别对单线、双线、四线列车荷载作用下高路堤的标准基床本体内的竖向应力的传递分析及不同深度平面内的竖向应力分布情况的分析,得出相应的应力传递及分布规律。研究结论:基床顶部的列车荷载,基本沿45°方向向下传递。当施加多线荷载时,将在基床底部区域产生叠加。列车荷载在基床底部平面内产生的竖向应力不是均匀分布的,而是呈中间大两侧小的曲线分布。当施加对称的列车荷载时,应力最大区域位于基床底部平面的中心。

Study on Transmission Laws of Train Load in Subgrade of High - speed Railway

Research purposes: For the further optimization and determination of the compaction standards for the subgrade structure,filling materials and all structure layers of high-speed railway,the transmission and distribution of the vertical stress of the high embankment in the standard subgrade bed with the different deep planes under the effects of the train loads on the single track,double tracks and four tracks were analyzed with finite element method,and the corresponding transmission and distribution laws were offered. Research conclusions:The train load on the the subgrade top was down transmitted almost along the 45°direction.The load was overlapped in the bedding bottom under the effect of the train loads on the multiple tracks.The vertical stress in the foundation base caused by the train load was distributed unevenly and it was distributed with a curve that the stress in the middle region was bigger than that in the periphery.The maximum vertical stress appeared in the middle of the subgrade bed under the effect of the symmetrical train load.