Abstract
When testing of stiff soil specimens using a Stokoe resonant column apparatus (RCA) the compliance of the apparatus significantly influences the derived stiffness of the soil [6]. In this paper, we present a simple mathematical model that takes into account equipment compliance, and therefore improving the accuracy in derivation of the small strain shear modulus of soils tested using a Stokoe RCA. The model utilises the simple harmonic motion of two springs in series to derive the equations of motion; one spring represents the equipment torsional stiffness, while the other spring represents the unknown soil stiffness. The apparatus torsional stiffness can be determined experimentally with a series of aluminium calibration bars. A finite element model was developed to validate the ‘two-spring’ model, confirming that the ‘two-spring’ model was able to significantly mitigate equipment compliance when determining specimen stiffness.
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Bui, M.T., Priest, J.A., Clayton, C.R.I. (2019). A New Calibration Technique to Improve Data Reduction for Stokoe Resonant Column Test. In: Randolph, M., Doan, D., Tang, A., Bui, M., Dinh, V. (eds) Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering. VSOE 2018. Lecture Notes in Civil Engineering , vol 18. Springer, Singapore. https://doi.org/10.1007/978-981-13-2306-5_3
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