Study on influence of pile top load and temperature cycle on bearing behavior of energy pile in loess foundation
In order to compare and analyze the vertical bearing deformation behavior of ordinary pile and energy pile without temperature cycle,the temperature cycling test of energy piles in loess foundation was carried out.The model piles were the cast-in-place reinforced concrete filling piles,and the loess was the artificially prepared remodeling loess.The results show that the temperature cycle weakens the lateral resistance of energy pile body in the loess foundation,and enhances the end re-sistance of energy pile.The greater the working load at the pile top during the temperature cycle,the greater the weakening effect of pile side resistance and the enhancement effect of pile end resistance,which leads to a significant increase in the ver-tical compressive bearing capacity of energy pile compared with that of ordinary pile.In addition,according to the results of model test,the hyperbolic function model of the pile-soil interface friction resistance with pile-soil relative displacement and the pile end soil reaction force with pile-end settlement was established through data fitting,and the model parameters were determined.The comparison between the calculation results of the hyperbolic load transfer function and the experimental re-sults presents that the proposed model can reasonably reflect the influence of temperature cycle and working load on pile top on the bearing capacity of pile foundation.The research results can provide some reference for the safety design of energy piles in loess area.
energy pileloessmodel testtemperature cyclingpile-soil load transfer function
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