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- W3093380329 abstract "Shear modulus ( G max at very small strain and G at large strain) and constraint modulus at very small strain ( M ) are important soil parameters for static and dynamic analysis in geotechnical applications. However, these dynamic properties of unsaturated soil are rarely reported. In this study, a cyclic simple shear apparatus was newly-modified for allowing both the shear and constrained moduli at both very small and large strains to be measured. Benders or ultrasonic sensors were embedded in an unsaturated soil sample for transmitting/receiving shear- and pressure-wave, respectively. Two very-small-strain tests were conducted to determine the G max , M and soil damping ratio of a sand for a wide range of suction covering from the boundary-effect, transition and residual zone of the water retention curve of the sand. In addition, six large-strain cyclic simple shear tests were carried out to investigate G . The test results showed that G max and M were approximately constant before reaching the air-entry value, but there was a significant increase in G max as the sand dried further. Yet, M dropped within the transition zone, and interestingly when the suction was beyond the residual value, M increased. M along the wetting path was higher than that along the drying path. The damping ratio, on the other hand, first reduced before reaching the air-entry value, but it increased at the transition zone and then decreased within the residual zone. At large strain, G / G max also increased as suction increased until reaching the residual zone, beyond which the normalised value show substantial decreased." @default.
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- W3093380329 date "2020-01-01" @default.
- W3093380329 modified "2023-09-26" @default.
- W3093380329 title "Very-small to large strain dynamic behaviour of unsaturated sand in a wide range of suction" @default.
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- W3093380329 doi "https://doi.org/10.1051/e3sconf/202019503002" @default.
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