Abstract
The objective of the paper is to develop a resilient modulus prediction model for load-bearing compaction fills of crushed-rock-soil-mixtures which start being recycled from adjacent cutting and tunneling in the recent construction of highways and high-speed railways in mountainous sites in Korea. Often, the mixture is scarcely engineered except for controlling the maximum grain size in the range of 100–300 millimeters and the grain distribution was simply represented median grain diameter (D 50 ) in the order of 10–60 millimeters. The evaluation of resilient moduli, using the “orthodox” repeated loading tri-axial test, is not even conceivable for such a large-size gravelly material. A realistic alternative is to utilize the well-developed techniques which are currently used for measurements of subtle different modulus, such as shear modulus. The prediction model was developed by: (1) defining the model as the combination of maximum Young’s modulus and its normalized reduction curve for high strain, (2) adopting the modified hyperbolic model of modulus reduction curve, and (3) converting the model parameters from in-situ maximum shear moduli and the reduction curves of modeled materials using the large-scale free-free resonant column tests. The values of model parameters were listed for the limited sites. It should be noted that, if the gradation curve widely stretched including quite an amount of fines, scalped specimens may be used to evaluate the model parameters of such a “dirty” material.
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Park, C.S., Park, I.B. & Mok, Y.J. Evaluation of resilient moduli for recycled crushed-rock-soil-mixtures using in-situ seismic techniques and large-scale resonant column tests. KSCE J Civ Eng 19, 1647–1655 (2015). https://doi.org/10.1007/s12205-014-1020-2
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DOI: https://doi.org/10.1007/s12205-014-1020-2