Modelling the initial shear stiffness of unsaturated soils as a function of the coupled effects of the void ratio and the degree of saturation |
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| Authors: | Mahnoosh Biglari Claudio Mancuso Anna d’Onofrio Mohammad Kazem Jafari Ali Shafiee |
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| Institution: | 1. International Institute of Earthquake Engineering and Seismology (IIEES), Geotechnical Engineering Research Centre, No. 26, Arghavan St., North Dibaji St., Farmanieh, Tehran, Iran;2. Dipartimento di Ingegneria Idraulica, Geotecnica ed Ambientale at The University of Naples Federico II, Via Claudio, 21-80125 Napoli, Italy |
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| Abstract: | Existing models for predicting the small strain behaviour of unsaturated soil are not capable of predicting the initial shear stiffness during suction reduction under normally consolidated conditions. This problem has been addressed in the present study by combining an existing elastoplastic model and recent experimental data to provide a new model for the initial shear stiffness. The model, which is similar to that typically adopted for saturated soils, uses the average skeleton stress and an additional function of the degree of saturation. This new model not only captures the behaviour of the new experimental results, but it also describes a unique relationship between saturated and unsaturated soils. |
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| Keywords: | Initial shear stiffness Unsaturated soils Modelling Compacted soils Average skeleton stress Bonding variable |
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