【作者】 周亮；

【导师】 席永慧； 王如路；

【作者基本信息】 同济大学 ， 建筑与土木工程， 2007， 硕士

【摘要】 在城市轨道交通建设方兴未艾的同时,地铁运行所引发的振动与噪声问题也逐渐显现出来。地铁列车运行引起的振动也越来越被人们所关注,在国际上,振动已被列为七大环境公害之一,众多学者已经开始研究振动的污染规律、产生的原因、传播途径、控制方法以及对人体的危害等。本文通过现场测试,对隧道段和高架段上不同减振轨道结构的振动加速度在时域和频域内的特征进行研究,研究对象包括钢轨、浮置板、弹性支承块、轨枕、隧道壁、高架桥面等;通过对比圆形隧道和矩形隧道在列车荷载作用下的振动响应,分析了隧道断面形式对隧道振动的影响。利用有限差分程序建立了列车荷载引起的环境振动数值模型,通过计算得到了地表不同监测点处的振动加速度时程曲线,进而通过傅立叶变换得到了地表振动加速度的频谱曲线。此外,还研究了相邻隧道在列车荷载作用下的动力特性。更多还原

【Abstract】 The metro line has brought us great convenience, at the mean time it also causes many problems such as vibration. In this paper, the origin, propagation and attenuation of environmental vibration is studied by both test and numerical method, so that we can evaluate and forecast the environmental vibration produced by subway traffic according to practice. This paper is composed of two parts, test and numerical study.Firstly, this paper studies the vibration of the rail, the floating slab, the elastic supporting block and the tunnel. By measuring the vibration history, the amplitudes of acceleration were analyzed. And the frequency spectrum was obtained, the dominant frequency of the floating slab is between 40-100Hz.Secondly, the finite difference method is used to simulate the vibration of soil-tunnel system. The quiet boundaries are applied in the numerical model, which makes the simulation more effective. And the vibration of ground and adjacent tunnel was analyzed. It shows that the amplitude of ground vertical acceleration is grater than that of lateral acceleration.更多还原