Abstract
Wave barriers are placed actively and passively in the ground to reduce the transmission of vibration produced by industry, traffic, train, etc. They include open trenches, in-filled trenches and sheet piles, etc. In most recent studies, the researchers have worked on parameters such as depth, width, length of trenches and also, the distance between the source of vibration and trench in cohesive soils. Most researches are evaluation on screening induced by shallow foundation. In this study the passive isolation has been investigated with the help of open trenches screening against the vibration produced by deep foundations in sandy soils, and the effect of trench angle and radius have been studied. Moreover, the reasons for amplitude increasing before open trenches have been evaluated. Three dimensional finite element analyses (FEM) with ANSYS software are used to achieve an exact parametric study on passive screening. The assumed strains are less than 10-3so the bilinear Elasto-Plastic behavior has been utilized.
Highlights
It is obvious that vibration occurred by machines, structures, and dynamic systems is destructive; Firstly, because of their inculcating stresses and vibrations which can cause failure or fatigue on nearby structures and, Secondly because of the aggravating effect of vibration on the performance of vibration producer
Celebi et al (2006) with the help of finite element method (FEM) showed that using an open trench has an important effect on reduction of vibration amplitudes induced by passing trains
8.1 The Evaluation of Amplitude Increasing before Trench As it can be seen in Figures 11 through 13, near the trench there is a dramatic increase in amplitude Reduction ratio (Arr)
Summary
It is obvious that vibration occurred by machines, structures, and dynamic systems is destructive; Firstly, because of their inculcating stresses and vibrations which can cause failure or fatigue on nearby structures and, Secondly because of the aggravating effect of vibration on the performance of vibration producer. El Nagger and Chehab (2005) conducted a numerical research using two-dimensional model to evaluate the screening effectiveness of open and in-filled trenches on reducing the pulse-induced waves of shallow foundations resting on an elastic half-space. Celebi et al (2006) with the help of finite element method (FEM) showed that using an open trench has an important effect on reduction of vibration amplitudes induced by passing trains They presented two mathematical models and numerical techniques for solving problems related to wave propagation. Tsai et al (2007) worked on active isolation provided by pile barriers against vibration induced by shallow foundations under vertical loading They investigated the effect of pile dimensions, pile distances, pile materials and screening location. The ground passive isolation of deep foundations have been studied by open trenches in sandy soils and the effect of two important parameters; trench radius and trench angle, have been evaluated
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