岩土力学2018，Vol.39Issue(3)：872-880,9.DOI:10.16285/j.rsm.2016.0680
高铁列车荷载作用下桩网复合地基振动特性模型试验
Piled embankment model test on vibration characteristics under high-speed train loads
摘要
Abstract
A piled embankment with reinforcement is one of embankments widely used by high-speed railways.The effect of vibration velocity response under train loads of high-speed railways on train running safety and surroundings is crucially important.A large-scale piled embankment model was set up with X-section cast-in-place concrete pile as vertical reinforcement.The vibration performance of the piled embankment under train load of high-speed railways was investigated.The influence of loading frequencies,loading amplitudes,and the number of cycles on vibration velocity of the piled embankment model was revealed in this paper.The results show that it is faster for attenuation of vibration velocity along the transverse direction of the piled embankment.The impact of the embankment on energy dissipation is remarkable,so the effect of vibration induced by train running on surroundings is weaker.The attenuation of vibration velocity along the piled embankment depth is different from the transverse direction of the piled embankment.The piled embankment system shows the greatest attenuation of vibration velocity is from track slab and reinforced concrete base to surface layer of subgrade bed.The gravel cushion with geogrids attenuates less due to shock isolation cushion.The piles in the foundation make attenuation of vibration velocity by train running slower and influence depth deeper.Vibration velocity amplitude increases gradually with the increase of loading frequency,and reaches a peak at 25 Hz.It becomes bigger step by step with the increase of loading amplitude and stays the same with the increase of the numbers of cycles.关键词
振动速度/高铁列车荷载/桩网复合地基/模型试验Key words
vibration velocity/train load of high-speed railways/piled embankment with reinforcement/model test分类
建筑与水利引用本文复制引用
牛婷婷,刘汉龙,丁选明,陈育民..高铁列车荷载作用下桩网复合地基振动特性模型试验[J].岩土力学,2018,39(3):872-880,9.基金项目
长江学者创新团队项目资助(No.IRT1125) （No.IRT1125）
国家自然科学基金资助(No.51378177,No.51420105013) （No.51378177,No.51420105013）
安徽理工大学青年科学研究基金(No.QN201105).This work was supported by the Changjiang Scholar and Innovative Research Team Project (IRT1125),the National Natural Science Foundation of China (51378177,51420105013) and the Youth Science Fund of Anhui University of Science and Technology (QN201105). （No.QN201105）
