Modelling of shear stiffness of unsaturated fine grained soils at very small strains |
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| Institution: | 1. Department of Engineering Geology, Institute of Hydrogeology, Engineering Geology and Applied Geophysics, Faculty of Science, Charles University in Prague, Prague, Czech Republic;2. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;1. School of Engineering, Newcastle University, NE1 7RU, United Kingdom;2. Dipartimento di Ingegneria Civile, Chimica e Ambientale, Università degli Studi di Genova, Genoa, Italy;3. Department of Engineering, Durham University, DH1 3LE, United Kingdom;1. Stewart Engineering, 5400 Old Poole Road, Raleigh, NC 27695-7908, United States;2. Civil, Construction and Environmental Engineering, 421 Mann Hall, 2501 Stinson Drive, Box 7908, NC State University, Raleigh, NC 27695-7908, United States;3. Civil, Construction and Environmental Engineering, 410 Mann Hall, 2501 Stinson Drive, Box 7908, NC State University, Raleigh, NC 27695-7908, United States;1. School of Civil, Environmental and Chemical Engineering, Royal Melbourne Institute of Technology (RMIT), Melbourne, Vic 3001, Australia;2. Centre of Excellence for Geotechnical Science and Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, PR China;2. College of Resources and Safety Engineering, Chongqing University, Chongqing 400030, PR China;3. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400030, PR China |
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| Abstract: | The shear modulus at very small strains (less than 0.001%) is an important parameter in the design of geotechnical structures subjected to static and cyclic loadings. Although numerous soil models are available for predicting shear modulus of saturated and dry soils, only a few ones can predict shear stiffness at very small strains of unsaturated soils correctly. In this study, a few unsaturated soil models are evaluated critically and compared with a newly developed model. This newly proposed model is verified by using measured shear modulus at very small strains for three different low plasticity fine grained soils available in the literature. It is found that this new model can predict shear modulus at very small strain resulting from an increase and a decrease in mean net stress at constant matric suction for low plasticity fine grained soils. Moreover, this model is able to give a reasonably good prediction on shear stiffness at very small strain during wetting of a collapsible unsaturated soil. In addition, the newly proposed model is illustrated to capture a consistent trend with experimental data of shear stiffness at very small strain for non-collapsible soils obtained during drying–wetting cycles. This evaluation revealed that the newly proposed model has better predictive capabilities than some earlier formulations of the same simplicity. In addition, the proposed model with fewer parameters has similar predictive capability as compared with a more complex model. |
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| Keywords: | Shear modulus Very small strains Low plasticity Fine grained soil |
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