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A novel procedure to determine shear dynamic modulus and damping ratio for partial saturated compacted fine-grained soils
Abstract This paper presents a new procedure for the characterisation of the dynamic mechanical properties of unsaturated fine-grained soils (i.e., dynamic shear modulus and phase angle). The procedure uses a rheometer, which is a conventional device for the characterisation of viscous and viscoelastic materials but with limited used in the area of geotechnical engineering. Tests were carried out on cylindrical samples following a dynamic loading scheme under strain-controlled conditions. This research is divided into two phases. The first phase aims at validating the proposed experimental methodology. Thus, one sample of kaolin was tested using the proposed methodology, and the results were compared against those obtained from the conventional Resonant Column test. During the second phase, samples of kaolin were compacted at the optimum Proctor Standard; conditioned at different degrees of saturation, and tested using the proposed procedure to show its applicability on partially saturated soils. The dynamic shear modulus and phase angle of these samples were measured using a strain level ranging from 6×10-6 to 1×10-3 with different suction conditions and without confinement pressure. The results suggest that the newly developed procedure could be more versatile and accurate than available standardized tests.
Highlights We proposed a new procedure for the characterization of the dynamic mechanical properties of unsaturated fine-grained soils. The proposed methodology allows working with very small samples of cylindrical and hollow cylindrical shapes with high precision. The use of small samples enables the study of the dynamic properties of unsaturated soils since the equilibration of suction is much faster than in the larger samples used in classical tests. The results show the very high effect of suction pressure on the shear modulus and damping ratio. This methodology could be used to study the effect of weather on the dynamic response of soil structures.
A novel procedure to determine shear dynamic modulus and damping ratio for partial saturated compacted fine-grained soils
Abstract This paper presents a new procedure for the characterisation of the dynamic mechanical properties of unsaturated fine-grained soils (i.e., dynamic shear modulus and phase angle). The procedure uses a rheometer, which is a conventional device for the characterisation of viscous and viscoelastic materials but with limited used in the area of geotechnical engineering. Tests were carried out on cylindrical samples following a dynamic loading scheme under strain-controlled conditions. This research is divided into two phases. The first phase aims at validating the proposed experimental methodology. Thus, one sample of kaolin was tested using the proposed methodology, and the results were compared against those obtained from the conventional Resonant Column test. During the second phase, samples of kaolin were compacted at the optimum Proctor Standard; conditioned at different degrees of saturation, and tested using the proposed procedure to show its applicability on partially saturated soils. The dynamic shear modulus and phase angle of these samples were measured using a strain level ranging from 6×10-6 to 1×10-3 with different suction conditions and without confinement pressure. The results suggest that the newly developed procedure could be more versatile and accurate than available standardized tests.
Highlights We proposed a new procedure for the characterization of the dynamic mechanical properties of unsaturated fine-grained soils. The proposed methodology allows working with very small samples of cylindrical and hollow cylindrical shapes with high precision. The use of small samples enables the study of the dynamic properties of unsaturated soils since the equilibration of suction is much faster than in the larger samples used in classical tests. The results show the very high effect of suction pressure on the shear modulus and damping ratio. This methodology could be used to study the effect of weather on the dynamic response of soil structures.
A novel procedure to determine shear dynamic modulus and damping ratio for partial saturated compacted fine-grained soils
Villacreses, Juan P. (author) / Caicedo, Bernardo (author) / Caro, Silvia (author) / Yépez, Fabricio (author)
2019-12-30
Article (Journal)
Electronic Resource
English
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