蜂窝状屏障隔离高速列车振动传播的工程的分析研究.pdf

硕士学位论文摘要近年来,高速铁路开始在我国获得快速发展。国外高速铁路的运营情况表明, 随着列车速度的提高,高速列车诱发的环境振动(包括大地振动和邻近建筑物振动) 问题变得尤为突出。高速列车诱发的环境振动对居民的日常生活、工作以及一些精密仪器设备的生产和使用产生很大的影响,甚至危及到一些古建筑的结构安全。工程中通常采用屏障隔振(又称波障)来隔离或减轻这种振动危害,目前一种有竞争力的屏障隔振方案为蜂窝状屏障。本文采用通用有限元软件ANSYS建立蜂窝状屏障隔振有限元模型,对其隔振效果进行分析,为工程隔振提供一定有意义的依据。主要研究内容包括: (1)介绍振动传播的基本原理、铁路引起地面振动传播的特征、地面屏障隔振的基本原理以及地面屏障隔振的设计准则、近场主动隔振和远场被动隔振以及隔振效果的振级表示。(2)考察了振动与波动有限元分析中的若干基本问题,对有限元模型尺寸、单元尺寸、时间步长进行探讨,阐述了动力边界条件的确定。最后通过算例分析给出了隔振系统有限元分析的模型尺寸、单元尺寸、时间步长以及边界条件。(3)采用平面有限元方法,用通用有限元软件ANSYS建立平面应变分析模型,分别讨论一排、二排蜂窝状屏障在原土护壁、空心护壁、轮胎护壁三种填充材料下的隔振效果,得出一些有意义结论。(4)建立路基、屏障、场地的三维有限元模型,分析不同振源位置屏障隔振效果和不同深度桩屏障隔振效果,为工程设计提供理论依据,具有较大的理论意义和应用价值。关键词:高速列车振动;屏障隔振;蜂窝状屏障:隔振效果;有限单元法蜂窝状屏障隔离高速列车振动传播的工程研究 Abstract In recent years,high—speed railways have been developed rapidly oprations of high-speed railways in many foreign countries showed that the environmental vibration problems induced by high—speed strains including the vibration ofthe ground and the neighboring buildings are more serious when the strain’S speed environmental vibrations would produce heavy influence on inhabitants’daily lives,work,manufacturing and application ofcertain precision instruments,and even tobe acrisis tosome ancient buildings. The barrierisolation(wave impeding barrier)is often applied toisolate or reduce the vibration in engineering present,the b wave impeding barrier(WIB)displays itspositive advantages inthe barrier thispaper, theFEM software ANSYS isused tomodel the barrier isolation ofthe b results obtained from theanalysis based on ANSYS present some valuable references to the vibration isolation in engineering main research contents inthispaper are asfollows: (1)The fundamental principle ofthevibration propagation,the characteristics of theground vibration propagation caused by thetrains,the fundamental principle and standard ofthe ground barrier isolation,the active isolation ofthe vicinal vibration and thepassive isolation ofthefaraway vibrati