The performance of inclined secant micro-pile walls as active vibration barriers |
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| Institution: | 1. College of Engineering, American University of Sharjah, PO Box 26666, Sharjah, United Arab Emirates;2. Department of Civil and Environmental Engineering, the University of Western Ontario, London, Ontario, Canada N6A 5B9;3. Cairo University, Cairo, Egypt;1. KU Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001 Leuven, Belgium;2. CEDEX, Laboratoria de Geotecnia, Alfonso XII 3, 28014 Madrid, Spain;1. KU Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, B-3001 Leuven, Belgium;2. Trafikverket, 405 33 Göteborg, Sweden;1. DMII, Università degli Studi Guglielmo Marconi, Roma 00193, Italy;2. DIECII, Università degli Studi di Messina, Messina 98122, Italy |
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| Abstract: | The isolation of vibrations from the surroundings is one of the important problems in the design of machine foundations. The use of open trenches, infilled trenches, single and multiple pile rows have been widely studied. In this paper, the vibration screening efficiency of an inclined secant micro-pile wall positioned as an active vibration barrier is investigated. The study is performed using three-dimensional time domain finite element analyses. Various parameters such as barrier depth, inclination, barrier distance and load excitation frequency were studied. The results show that inclined secant micro-pile walls are a viable vibration isolation option for a multitude of vibration problems. It is shown that varying barrier inclination angle from 90° to 120° improved vibration isolation performance as high as 44% relative to the vertical barrier for the active isolation case. The effectiveness of the barrier increases as its depth increases and also as the excitation frequency increases. The orientation of the inclined barrier towards or against vibration source is shown to be a fundamental design consideration. |
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| Keywords: | Machine foundations Vibration isolation Secant micro-pile walls Active isolation Loading frequency |
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