This paper describes the results of an experimental investigation on the behaviour of a lightly grouted loose mediumsand under both monotonic and cyclic loading. The experimental programme in the present study was carried out onboth untreated and treated sand specimens stabilized with a silica-based grout, and comprises isotropic triaxial compressiontests equipped with bender elements, drained triaxial monotonic shearing tests, and undrained cyclic tests in a simple shear(SS) apparatus. The results highlight that the weak cementation level induced by chemical treatment was sufficient to moderatelyincrease small-strain stiffness and stress–dilatancy of the grouted sand during drained monotonic shear. A small cohesionintercept was observed in the analyzed failure envelope, while cyclic liquefaction resistance exhibited a much moresignificant increase, with a different pattern of behaviour between low and high stress levels. Finally, undrained cyclic SStest results evidenced that silicate grout employed in this research improves undrained cyclic shear strength in a manner similarto densification of the same material up to a density index of approximately 75%.

Static and dynamic properties of a lightly cemented silicate-grouted sand

PORCINO, Daniela Dominica
;
2012

Abstract

This paper describes the results of an experimental investigation on the behaviour of a lightly grouted loose mediumsand under both monotonic and cyclic loading. The experimental programme in the present study was carried out onboth untreated and treated sand specimens stabilized with a silica-based grout, and comprises isotropic triaxial compressiontests equipped with bender elements, drained triaxial monotonic shearing tests, and undrained cyclic tests in a simple shear(SS) apparatus. The results highlight that the weak cementation level induced by chemical treatment was sufficient to moderatelyincrease small-strain stiffness and stress–dilatancy of the grouted sand during drained monotonic shear. A small cohesionintercept was observed in the analyzed failure envelope, while cyclic liquefaction resistance exhibited a much moresignificant increase, with a different pattern of behaviour between low and high stress levels. Finally, undrained cyclic SStest results evidenced that silicate grout employed in this research improves undrained cyclic shear strength in a manner similarto densification of the same material up to a density index of approximately 75%.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12318/6582
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