地面不均匀性对风致地面振动的影响

M. Mohammadi, C. Hickey, R. Raspet, V. Naderyan
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引用次数: 0

摘要

许多岩土工程应用,如道路建设、交通、基础设计和农业生产,都需要地面近表面(渗流区、临界区)的力学行为。机械行为也可能间接地与通过这个关键界面的传输有关,例如;水入渗和气体通量对水文和气候研究很重要。用于近地表探测的机械源包括高频机电源和扬声器。我们试图利用风产生的压力波动作为研究近地表土壤特性的来源。在前人的研究中,将地面模拟为弹性均匀半空间,建立了风致地面运动的预测模型。然而,地面是一种分层或不均匀的介质,由于表面压力的不同,会有不同的响应。在本报告中,我们讨论了不同种类的理论非均匀地基及其由于表面载荷的可用分析响应。此外,我们使用商用有限元软件包Comsol-Multiphysics®来模拟由半空间上的一层组成的更真实的地面。通过插值Comsol输出,推导出新的响应函数,代入风地耦合方程。用均匀和非均匀地面预测的比较来评价分层对风致地面振动的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
INFLUENCE OF GROUND INHOMOGENEITY ON WIND INDUCED GROUND VIBRATIONS
The mechanical behavior of the near surface of the ground (vadose zone, critical zone) is required for many geotechnical applications such as roadway construction, trafficability, foundation design, and agricultural production. The mechanical behavior may also be indirectly related to transport across this critical interface such as; water infiltration and gas flux which are important to hydrological and climate studies. Mechanical sources for investigating near surface of the ground included high frequency electromechanical sources and loudspeakers. We attempt to exploit the pressure fluctuations produced by wind as a source for investigating near surface soil properties. In a previous study, the ground was modeled as an elastic homogenous half space and a prediction model was developed for the wind-induced ground motion. However, ground is a layered or inhomogeneous medium and will have a different response due to the surface pressure. In this presentation, we discuss different kinds of theoretical inhomogeneous grounds and their available analytical responses due to a surface load. Furthermore, we use Comsol-Multiphysics®, a commercial finite element package, to simulate a more realistic ground consisting of a layer over a half-space. A new response function is derived by interpolating the Comsol output to substitute in the wind-ground coupling equations. A comparison between the homogeneous and non-homogeneous ground predictions are used to evaluate the importance of layering on wind-induced ground vibrations.
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