| 高速铁路新型路堑基床结构动力响应分析 |
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| 引用本文： | 申权,杨果林,胡敏,房以河,晏园.高速铁路新型路堑基床结构动力响应分析[J].西北地震学报,2017,39(6):1118-1125. |
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| 作者姓名： | 申权 杨果林 胡敏 房以河 晏园 |
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| 作者单位： | 中南大学 土木工程学院, 湖南 长沙 410075;湖南工业大学土木工程学院, 湖南 株洲 412007,中南大学 土木工程学院, 湖南 长沙 410075,中南大学 土木工程学院, 湖南 长沙 410075,中南大学 土木工程学院, 湖南 长沙 410075,桂林电子科技大学 商学院, 广西 桂林 541004 |
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| 基金项目： | 国家自然科学基金（51478484，51778641）；中南大学中央高校基本科研业务费专项资金（2015zzts059）；湖南省自科基金项目（2016JJ2046） |
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| 摘 要： | 研制出一种新的防排水结构层用以控制膨胀土路基的含水率变化,从而达到对新建云—桂高速铁路膨胀土地段整治的目的。本文采用FLAC~(3D)有限差分软件研究该新型路堑基床结构(基床中设置新型防排水结构层)在列车荷载作用下动力响应规律,并利用现场试验结果对数值研究结果进行验证。研究表明:新型基床中道砟和新型防排水结构层对动应力衰减贡献较大;新型防排水结构层对竖向动应力、剪应力衰减作用明显,增强了基床结构的动力稳定性;新型基床结构能够更有效地控制基床的动位移;新型基床中振动速度和加速度随深度的增加而减小,道砟对振动速度和加速度的衰减作用明显。新型路堑基床结构振动速度和动应力的现场实测与数值分析规律基本一致,且实测值与计算值大小相近。研究成果可为特殊土地区高速铁路基床的设计、施工及其动力响应研究提供参考。
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| 关 键 词： | 新型路堑基床结构 FLAC3D 动应力 动位移 加速度 现场试验 |
| 收稿时间： | 2016/4/25 0:00:00 |
Numerical Analysis of Dynamic Response on a New Type of CuttingBed in the Expansive Soil District on the Yun-Gui Railway |
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| SHEN Quan,YANG Guolin,HU Min,FANG Yihe and YAN Yuan.Numerical Analysis of Dynamic Response on a New Type of CuttingBed in the Expansive Soil District on the Yun-Gui Railway[J].Northwestern Seismological Journal,2017,39(6):1118-1125. |
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| Authors: | SHEN Quan YANG Guolin HU Min FANG Yihe and YAN Yuan |
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| Institution: | School of Civil Engineering, Central South University, Changsha 410075, Hunan, China;School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, Hunan, China,School of Civil Engineering, Central South University, Changsha 410075, Hunan, China,School of Civil Engineering, Central South University, Changsha 410075, Hunan, China,School of Civil Engineering, Central South University, Changsha 410075, Hunan, China and Guilin University of Electronic Technology, Business School, Guilin 541004, Guangxi, China |
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| Abstract: | This article used FLAC3D finite difference software to study the dynamic response rules of the new cutting bed structure with a new type of waterproof and drainage structure layer set in the bedding. Past studies have proven that a new bed ballast and a new type of waterproof and drainage structure can significantly contribute to the attenuation of dynamic stress. A new type of waterproof and drainage structure layer on vertical dynamic stress and shear stress attenuation can enhance the dynamic stability of the bedding structure, whereas a new bed structure can more effectively control bed dynamic displacement. New bed vibration velocity and acceleration decrease with the increase of depth. Meanwhile, the ballast of vibration velocity and the ensuring acceleration attenuation effect are obvious. The numerical simulation results and in-situ measurement data reveal a matching physical discipline at the vibration velocity and dynamic stress of the new cutting bed structure, indicating that both values decrease along the depth direction. The study''s findings can be used and referenced for the design, construction, and dynamic response study of high-speed railway cutting subgrades in special soil areas. |
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| Keywords: | new type of cutting bed structure FLAC3D dynamic stress dynamic displacement acceleration field test |
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