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• W1732555643 abstract "The increasing size of the population results in that unbuilt spaces needing to be used for the construction of new facilities. Large construction sites can generate disturbing vibrations to nearby buildings, both while construction is underway and afterwards through the operation of subways, for example. The establishment of new areas close to, for example, motorways and railways increases the risk of disturbing vibrations being propagated to the new buildings. It is important that efficient methods for reducing ground vibrations be available when densely built areas are being planned. Reduction in ground vibrations by use of wave obstacles is investigated here by use of numerical simulations, trenches and shaped landscapes being considered as wave obstacles. The effects of geometric parameters on open trenches, material parameters of filled trenches, and of infiltrated water in open trenches, were examined in appended Paper A. The finite element method involving use of both finite and infinite elements in the frequency domain was employed. In investigating the effects of the infiltrated water, account was taken of fluid-structure interaction. The finite element model, in which plane strain conditions were assumed, was applied to a road, the bedrock, two layers of soil and a trench. The depth of the trench and the elastic modulus of the solid material that was inserted into it were found to be the most important parameters to consider. The results concerning the infiltration of water into an open trench indicated the presence of water there to increase the vibration levels. Reduction in traffic-induced ground vibrations by use of shaped landscapes is investigated in appended Paper B, the effects of shaping the landscape surrounding a high-tech facility and using the landscape as a wave obstacle being studied. The effects of the geometric parameters of a shaped landscape were examined in parametric studies. An architectural landscape design was also investigated in terms of its effectiveness in reducing trac-induced ground vibrations. The finite element method involving use of both finite and infinite elements in the frequency domain was employed, the finite element models employed concerning a layer of soil and the underlying bedrock. It was found that anywhere from an appreciable reduction to an appreciable amplification of the vibrations can occur, depending upon the geometric parameters of the shaped landscape. Both types of ground modifications that were investigated were shown to be able to achieve an appreciable reduction in the level of vibration. Both the use of a trench filled with a solid material and use of a shaped landscape were found to result in a reduction in the level of vibrations of approximately 35 %. Both these types of methods can thus be regarded as being suitable for making it possible in this respect for buildings to be constructed close to vibration sources. (Less)" @default.
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• W1732555643 date "2013-01-01" @default.
• W1732555643 modified "2023-09-27" @default.
• W1732555643 title "Reduction in ground vibrations by the use of wave obstacles" @default.
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