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Please use this identifier to cite or link to this item: http://dspace.jdvu.ac.in/handle/123456789/28321

Title: Vibration Isolation using Open or In-Filled Trenches as Wave Barriers
Authors: Banerjee, Raja
Keywords: Civil Engineering
Vibration Isolation
Rayleigh Wave
In-filled trench
Peak Particle Velocity (PPV)
Issue Date: 2013
Abstract: Ground vibration induced by machine foundations and seismic activity can cause unfavorable effects on the nearby buildings ranging from annoyance to structural damage. With the development and expansion of traffic system, problems associated with ground vibration have required increased attention. Increasing vehicle loads, traffic volume, aging roads and railways vibration induced by traffic are gradually becoming a crucial problem. Most of these vibrations propagate in the form of surface (Rayleigh) waves. On the other hand, machine foundations produce a steady state vibration, for which, wave barriers can be a successful technique to minimize these effects by scattering the generated steady state surface waves. Although the traffic induced vibrations have much smaller amplitude than those considered in seismic design, but these may cause annoyance to human beings, damages to buildings and disturbances to sensitive equipments such as measurement devices and automated manufacturing in factories. Hence, the purpose arises to study the effects of the open and in-filled trenches as wave barriers to the ground vibration under the excitation of a model pile driver (with a specific load falling from a specific height) in small scale laboratory tests. Laboratory methods are utilized for investigating the influence of open and in-filled trenches (in-filled with Ennore sand) on vibrations in a remolded clay bed by conducting vertical vibration by a falling load with different depth of trench. The effect of these changes is monitored both in laboratory measurements and in a simulated real-life situation. The calculation software PLAXIS 8 (2D DYNAMIC; Finite element package) is used for creation of numerical models to study the ground vibration with and without trenches during driving a model pile. This paper presents The Peak Particle Velocity (PPV) of ground, measured from prototype pile driving. The results thus obtained from laboratory measurements are confronted with those achieved from the models. It is finally concluded that although the sand filled trench can be use as a wave barrier, open trench is proved to be the most effective for this case of vibration isolation.
Description: Full Text
Appears in Collections:Civil Engineering - Master's Degree Theses

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