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Analysis and design of open trench barriers in screening steady-state surface vibrations

Earthquake Engineering and Engineering Vibration 2014年第3期13卷 545-554页

作者： Ankurjyoti Saikia Utpal Kumar Das Department of Civil Engineering Tezpur University

The problem of vibration isolation by rectangular open trenches in a plane strain context is numerically studied using a finite element code, PLAXIS. The soil media is assumed to be linear elastic, isotropic, and homogeneous subjected to a vertical harmonic load producing steady-state vibration. The present model is validated by comparing it with previously published works. The key geometrical features of a trench, i.e., its depth, width, and distance from the source of excitation, are normalized with respect to the Rayleigh wavelength. The attenuation of vertical and horizontal components of vibration is studied for various trench dimensions against trench locations varied from an active to a passive case. Results are depicted in non-dimensional forms and conclusions are drawn regarding the effects of geometrical parameters in attenuating vertical and horizontal vibration components. The screening efficiency is primarily governed by the normalized depth of the barrier. The effect of width has little significance except in some specific cases. Simplified regression models are developed to estimate average amplitude reduction factors. The models applicable to vertical vibration cases are found to be in excellent agreement with previously published results.

关键词： finite element open trench vibration isolation wave barrier non-dimensional

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Integrity of Local Ecosystems and Storm Water Management in Residential Areas

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Journal of Ocean University of China 2006年第4期5卷 363-367页

作者： WANG Lin WANG Weida GONG Zhaoguo College of Envirnmental Science and Engineering Ocean University of China Qingdao 266003 P. R. China

The authors designed an ecological storm water system in a residential area to replace the conventional underground channels for the collection of storm water so as to reduce the nutrients and sediments discharged. This system contains natural sub-creeks as drainage channels discharging overflow to nearby creeks, an open green trench, a storage pond, and natural sub-creeks. The sub -creeks were designed to be integrated into community landscape, which not only increases the efficiency of water usage, but also improves the aesthetic qualities of the community residence area as required by Agenda 21. This research proved the feasibility of an open storm water collection and utilization system for the design of a community water system.

关键词： storm water management ecological community water management open trench greenway pond system

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