For economic and construction schedule reasons, it was of interest to use calcareous rnudstone and clayey limestone originating from required plant grading excavations for the construction of a fill platform supporting structures of a mining projectin Peru. However, these materials are friable, break down upon handling, and exhibit swelling properties. Nevertheless, because of the high costs of hauling more favourable borrow materials from other sources, it was decided to construct a test fill, and to perform field and laboratory testing, to evaluate the technical requirements for achieving a satisfactory compacted fill using these materials. The field tests consisted of large-scale in situ density and plate loading tests, while the laboratory tests included soil classification, modified Proctor, triaxial (CID), and large size oedometer test. This paper describes the work performed and the most significant findings. As a result of this investigation, the fill was successfully constructed, with very significant savings in cost and schedule. Geotechnical properties of the material compacted to different densities are provided, including hyperbolic stress-strain parameters unique in technical literature for this type of material
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