【摘要】 结合某高速铁路桩板结构路基,建立桩板结构-地基土系统空间有限元模型,分析桩板结构路基动力特性。结果表明:其横、竖向基频理论计算与现场实测值比较接近。采用随机振动理论计算机模拟高速列车通过桩板结构路基全过程,系统仿真列车运营性能指标及桩板结构振动响应,与现场实测结果较好吻合。依据国内有关规范,综合评判高速列车运营和桩板结构路基空间振动性能。结果表明:高速列车通过桩板结构路基时,列车具有足够的抗脱轨安全度和优良乘客舒适性,桩板结构路基自身动力响应也较小,能满足高速列车安全、平稳运行要求。更多还原

【Abstract】 The finite space vibration model of the pile-plank structure—foundation soil system was set up in combination with the construction of the pile-plank structure subgrade laid for a particular high-speed railway.The dynamic characteristics of the pile-plank structure subgrade were calculated.The theoretical horizontal and vertical fundamental frequencies were found to be close to values measured on site.The inherent vibration characteristics of the pile-plate structure roadbed were revealed.The whole process of high-speed train running on the pile-plank structure subgrade was simulated by computer.The train operation performance and pile-plank structure vibration responses were analysed systematically by means of the theories of random vibration.The results of simulation calculation were basically consistent with those of dynamic field test.The high-speed train operation and pile-plank structure subgrade space vibration performance were evaluated comprehensively according to the relevant domestic standards and specifications.The results indicated that when a high-speed train runs on railway lines with the pile-plank structure subgrade,the train demonstrates sufficient anti-derailment reliability and good riding comfort and the dynamic self-responses of the pile-plank structure subgrade are small.更多还原