Cement fly-ash gravel (CFG) pile is a widely used ground reinforcement technique. This paper aims to address the mechanical\ncharacteristics of CFG composite foundation in consolidating saturated mine tailings (MTs) dam. The field static load tests were\nemployed to explore the bearing capacity of the CFG composite foundation, and finite element (FE) models in three dimensions\nvalidated through comparison with experimental results were used to discuss the pile-soil stress distribution and pile-soil stress\nratio of the CFG composite foundation. The results indicate that the distribution of earth pressure and pile stress is relatively\nhomogeneous and stable over depth and load, while the development of CFG composite foundation bearing capacity is insufficient,\nin which the developed bearing capacity of CFG piles is less than 50% of its characteristic value. Additionally, compared with the\nlaboratory model test results, the pile-soil stress ratio decreases with the increasing of the load in FEM results proved to better\nconform to the actual engineering conditions. Furthermore, the deformation modulus and thickness of cushion exert significant\ninfluence on pile-soil stress ratio and integral bearing capacity of CFG composite foundation.
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