摘要
依托渝昆高速铁路云贵段彝良北站“V”型沟谷地区桩板结构高填路基车站建设工程,建立了车辆-轨道-桩板结构路基三维有限元数值模型,分析了在列车上行、下行和会车3种工况下,桩板结构高填站场路基的动应力、动位移及竖向加速度的分布特征,结果表明:(1)列车动荷载主要由桩板结构向下传递至基岩,回填土及原地表土所受荷载较小;(2)地基竖向位移主要发生在回填土浅层土体与原地表土范围内,基床表层位移较小,基岩基本不产生位移;(3)路基竖向加速度随深度增加而递减,且在基床表层区域衰减最快;会车工况下,站坪竖向加速度振级大于单线荷载下所产生的站坪加速度振级。
In this paper,based on the station construction of the high-filled subgrade with pile-sheet structure in the V-shaped valley of Yiliang North Station in the Yungui Section of the Chongqing-Kunming High-speed Railway,a threedimensional finite element numerical model of vehicle-track-pile-slab structure subgrade is established,and the distribution characteristics of dynamic stress,dynamic displacement and vertical acceleration of high-filled subgrade with the pile-slab structure are analyzed under three working conditions of the train going up,down,and crossing. The results show that:(1)The dynamic load of the train is mainly transmitted through the pile-slab structure down to the bedrock,and the load on the backfill and the original surface soil is relatively small.(2)The vertical displacement of the foundation mainly occurs within the range of the shallow soil mass of the backfill soil and the original surface soil. The displacement of the surface layer of the subgrade bed is small,and the bedrock basically does not displace.(3)The vertical acceleration of the subgrade decreases with the increase of depth and attenuates fastest in the top layer of the subgrade bed. Under the crossing condition,the vertical acceleration vibration level of the station site is greater than the acceleration vibration level of the station site generated under the single-track load.
作者
孔文亚
黎康
谢恺
KONG Wenya;LI Kang;XIE Kai(Beijing-Kunming High-speed Railway Xikun Co.,Ltd,Chongqing 400023,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《高速铁路技术》
2022年第6期6-11,共6页
High Speed Railway Technology
关键词
铁路路基
动力特性
数值计算
站场路基
桩板结构
railway subgrade
dynamic characteristics
numerical calculation
station and yard subgrade
pile-slab structure
