Reinforcing the foundation of a railway bridge pier will change the constrained state of the pier and affect the stability of the structure and the safety of train operations.In this paper,based on the foundation reinforcement project of a light pier of a heavy haul railway,the influence of each key construction link on the stability,stiffness and vibration response of pier and bridge span structure was studied by means of numerical simulation and experimental test.The research results show that the foundation reinforcement construction is divided into four key construction steps:bored pile construc-tion,foundation side soil excavation,concrete pouring and pier transverse connection.Among them,soil excavation will lead to the decrease of pier stability and transverse stiffness.With the increase of excavation depth,both of them gradually decrease,while concrete pouring will cause the pier stiffness and stability to gradually increase,and pier transverse connection reinforcement will cause the pier stiff-ness to increase significantly,with an increase of 32％;In the whole construction stage,the vibration response of the bridge structure caused by soil excavation increases significantly,while the vibration responseof other reinforcement links to the bridge is not obvious;During the construction process,the train axle weight,speed,and abutment height are the most sensitive factors affecting the dynamic response of the bridge,which increases significantly with the increase of train axle weight and speed and abutment height.
关键词
基础加固/重载铁路/桥梁高度/静动力性能/数值模拟/加固试验
Key words
foundation reinforcement/heavy-haul railways/bridge height/static and dynamic per-formance/numerical simulation/reinforcement test
维普
万方数据