Effect of preloading on the amplification characteristics of soil profiles |
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| Institution: | 1. School of Public Health, Faculty of Health Sciences, Curtin University, Perth, WA, Australia;2. School of Psychology, Faculty of Sciences, University of Auckland, Auckland, New Zealand;3. Iranian National Center for Addiction Studies, Iranian Institute for Reduction of High-Risk Behaviour, Tehran University of Medical Science, Tehran, Iran;4. Psychotherapy and Psychopathology Research Unit, Research Center on Psychology, School of Psychology, University of Minho, Portugal;5. Faculty of Psychology and Educational Sciences, CPUP, University of Porto, Porto, Portugal;1. Department of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China;2. Shenzhen Institute of Geotechnical Investigation and Surveying, Shenzhen 518109, China;3. ARC CoE for Geotechnical Science and Engineering, University of Newcastle, Newcastle 2308, Australia;4. Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;5. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China;1. Centre for Offshore Foundation Systems, University of Western Australia, Perth, Western Australia, Australia;2. School of Civil, Environmental and Mining Engineering, University of Western Australia, Perth, Western Australia, Australia |
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| Abstract: | Preloading is a temporary loading, usually an embankment, applied to improve subsurface soils by densification. This paper studies the effect of preloading on the amplification characteristics of soft sites with an elaborate parametric analysis. The soil type, the depth of the bedrock, the water table depth, the level of preloading, the applied earthquake, the shear wave velocity of the bedrock and the shear modulus and damping versus shear strain relations were varied in a systematic manner. The analysis was performed by the commonly used one-dimensional equivalent-linear dynamic method. The shear wave velocity versus depth and the effect of preloading on shear velocity are computed with well-established soil mechanics equations. The results illustrated that the seismic response at the top of the profile generally decreases as a result of preloading. A more detailed analysis of results shows that the effect of preloading on the seismic response depends on the soil type and the depth of the bedrock. Based on these results, a method is proposed by which a practicing engineer involved with improvement of soft ground can simulate the effect of preloading on the seismic motion. |
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| Keywords: | Preloading Soil profiles Seismic response Response spectra Maximum acceleration |
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