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Modern methods for estimating the axial capacity of piles driven in granular media rely on accurate interface shear failure models. While earlier studies have focused on determining shaft friction failure parameters from small displacement laboratory shear box experiments, large displacement ring-shear interface tests provide a better representation of conditions adjacent to the shafts of driven piles. This paper describes systematic studies in which granular quartzitic media, ranging from angular rock flour to sub-rounded coarse sand, were sheared against concrete and steel interfaces in ring shear experiments that involved several metres of shear slippage. The study included an examination of how the large displacement processes involve grain crushing and modify the texture of the interfaces. Conclusions are drawn regarding the constant volume angle of interface shearing resistance that may be applied in pile design, the soils' particle size distributions and the roughness of the interfaces tested, before and after the ring-shear tests.
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