桩—饱和土周期结构在环境减振中的应用
本文选题:衰减域 + 周期性排桩 ; 参考:《北京交通大学》2015年硕士论文
【摘要】:摘要:排桩作为一种有效的环境减振措施,在工程中已有较广泛的应用,然而,排桩的周期性特性很少被研究者关注。由周期性理论可知,当频率处于衰减域范围内时,周期性结构对弹性波的传播具有很好的抑制作用。因此,对排桩进行设计时有必要考虑其周期性特性。现有的关于桩-土周期结构研究,对桩、土均做了均匀介质假定,而实际上土更接近于饱和土。本文采用饱和多孔介质模型并基于周期性理论,研究了桩-饱和土周期结构在环境减振中的应用。主要内容包括: (1)首先介绍了桩-饱和土周期结构的基本理论,包括Biot饱和土波动理论和周期性理论。介绍了用有限元法计算桩-饱和土周期结构的求解步骤,并验证了方法的正确性。 (2)采用有限元法计算了桩-饱和土周期结构的衰减域,研究了衰减域的特点,并讨论了相关参数对衰减域的影响。 (3)建立了桩-饱和土周期结构减振的数值分析模型,完成了频域响应分析,验证了利用桩-饱和土周期结构进行环境减振的有效性。
[Abstract]:Absrtact: as an effective environmental vibration damping measure, pile row has been widely used in engineering. However, the periodic characteristics of pile row are seldom concerned by researchers. According to the theory of periodicity, when the frequency is in the range of attenuation, the periodic structure can restrain the propagation of elastic wave well. Therefore, it is necessary to consider its periodicity when designing the row pile. In the present study of pile-soil periodic structure, the soil and pile are assumed to be homogeneous, but in fact, the soil is closer to saturated soil. In this paper, the application of pile-saturated soil periodic structure in environmental vibration reduction is studied based on the saturated porous media model and periodicity theory. The main elements include: Firstly, the basic theory of pile-saturated soil periodic structure is introduced, including Biot saturated soil wave theory and periodicity theory. The procedure of calculating the periodic structure of pile-saturated soil by finite element method is introduced, and the correctness of the method is verified. 2) the attenuation region of the pile-saturated soil periodic structure is calculated by finite element method, the characteristics of the attenuation domain are studied, and the influence of relevant parameters on the attenuation domain is discussed. (3) the numerical analysis model of the pile-saturated soil periodic structure is established, and the frequency domain response analysis is completed, which verifies the effectiveness of using the pile-saturated soil periodic structure to reduce the ambient vibration.
【学位授予单位】:北京交通大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TU435
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