A new calibration technique to improve data reduction for stokoe resonant column test

Bui, M.T., Priest, J.A. and Clayton, C. R.I. (2018) A new calibration technique to improve data reduction for stokoe resonant column test. In, Randolph, M., Doan, D., Tang, A., Bui, M. and Dinh, V. (eds.) Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering. VSOE 2018. (Lecture Notes in Civil Engineering, 18) Singapore. Springer, pp. 43-48. (doi:10.1007/978-981-13-2306-5_3).

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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Contributors

Author: C. R.I. Clayton

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