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.
CITATION STYLE
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 Lecture Notes in Civil Engineering (Vol. 18, pp. 43–48). Springer. https://doi.org/10.1007/978-981-13-2306-5_3
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