Cyclic resistance and liquefaction behavior of silt and sandy silt soils |
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| Institution: | 1. Hatch Engineering, Niagara Falls, Ontario, Canada. Formerly MESc Candidate Department of Civil and Environmental Engineering, Western University, London, ON, Canada;2. Department of Civil and Environmental Engineering, Spencer Engineering Building, Western University, London, ON, Canada N6A 5B9;3. Department of Civil and Environmental Engineering, Spencer Engineering Building, Western University, London, ON, Canada N6A 5B9;1. Department of Civil Engineering, Yeditepe University, ?stanbul, Turkey;2. 5A Mühendislik, ?stanbul, Turkey;3. MAG Mühendislik, ?stanbul, Turkey;4. Department of Civil Engineering, ?stanbul Technical University, ?stanbul, Turkey;1. Department of Civil Engineering, Tokyo University of Science, Japan;2. National Agriculture and Food Research Organization, Japan;3. Tokyu Construction Co., Ltd., Japan (Formerly graduate student, Department of Civil Engineering, Tokyo University of Science, Japan);1. Geotechnical Engineering Research Division, Korea Institute of Construction Technology, Goyang, Korea;2. Department of Civil and Environmental Engineering, Incheon National University, Incheon, Korea;1. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China;2. Department of Civil Engineering, Parks College of Engineering, Aviation and Technology, Saint Louis University, Saint Louis, MO, USA;3. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, Liaoning, China |
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| Abstract: | The liquefaction behavior and cyclic resistance ratio (CRR) of reconstituted samples of non-plastic silt and sandy silts with 50% and 75% silt content are examined using constant-volume cyclic and monotonic ring shear tests along with bender element shear wave velocity (Vs) measurements. Liquefaction occurred at excess pore water pressure ratios (ru) between 0.6 and 0.7 associated with cumulative cyclic shear strains (γ) of 4% to 7%, after which cyclic liquefaction ensued with very large shear strains and excess pore water pressure ratio (ru>0.8). The cyclic ring shear tests demonstrate that cyclic resistance ratio of silt and sandy silts decreases with increasing void ratio, or with decreasing silt content at a certain void ratio. The results also show good agreement with those from cyclic direct simple shear tests on silts and sandy silts. A unique correlation is developed for estimating CRR of silts and sandy silts (with more than 50% silt content) from stress-normalized shear wave velocity measurements (Vs1) with negligible effect of silt content. The results indicate that the existing CRR–Vs1 correlations would underestimate the liquefaction resistance of silts and sandy silt soils. |
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| Keywords: | Cyclic resistance Ring shear test Shear wave velocity Silt Liquefaction Soil dynamic |
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