高铁荷载下桩-土复合地基振动响应特性研究

发布时间：2018-03-09 04:25

本文选题：PCC桩复合地基　切入点：高铁荷载　出处：《铁道科学与工程学报》2017年10期 　论文类型：期刊论文

【摘要】：采用一种复合正弦波(M波)模拟列车移动荷载,建立轨道-路堤-PCC桩-土复合地基三维动力有限元模型,研究高速铁路路堤及PCC桩复合地基在列车荷载作用下的振动响应特性。研究结果表明:在靠近列车荷载作用处振动响应比较强,随着与轨道的距离增加,振动响应值也逐步降低,至地基远处24.5 m处,振动响应已经很小。路堤内振动波远低于枕木处振动幅值,振动波经路堤、垫层、桩体和土体层层过滤衰减作用,在地基下部土体中振动被削弱,振动的幅值和频率范围均受到影响。经过滤后地基下部土体振动响应频率接近或者低于土体自振频率,路堤、桩体和地基振动响应曲线体现了振动波在路堤系统各部分传播特点,反映出各部分振动特性。
[Abstract]:A three-dimensional dynamic finite element model of track embankment pile-soil composite foundation is established by using a composite sine wave M wave) to simulate the moving load of a train. The vibration response characteristics of high speed railway embankment and PCC pile composite foundation under train load are studied. The results show that the vibration response is relatively strong near the train load, and increases with the increase of the distance from the track. The vibration response value decreases gradually, and the vibration response is very small at 24.5 m from the foundation. The vibration wave in the embankment is far lower than the vibration amplitude at the sleeper, and the vibration wave is filtered and attenuated through the embankment, cushion, pile and soil layers. The vibration is weakened and the amplitude and frequency range of the vibration are affected. The vibration response frequency of the soil is close to or lower than the natural vibration frequency of the embankment. The vibration response curve of pile and foundation reflects the characteristics of vibration wave propagation in every part of embankment system and the vibration characteristic of each part.
【作者单位】：广州大学土木工程学院;河海大学土木与交通学院;中交第四航务工程勘察设计院有限公司;
【基金】：国家自然科学基金高铁联合基金重点资助项目(U1134207) 江苏省自然科学基金资助项目(BK2012811)
【分类号】：TU435;U211.3

【相似文献】