高填土场地不同桩径桩土相互作用及桩基负摩阻力研究

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中图分类号：TU473 文献标志码：A 文章编号：1000-4939（2025）04-0860-09

Abstract：In order to clarify the time-dependent evolution of pile-soil interaction and the change rule of negative friction resistanceof pile foundation in high filloess site，and clarify the influence of internal force change of pile foundation on long-term performance of pile foundation，considering the creep deformation of backfilloess，due to simulate the creep characteristics of backfill loess by Burgers model，FLAC3D software was used，and the time-dependent evolution of internal force，displacement and neutral point of rock-socketed pile foundation under the change of pile diameter was analyzed.Based on the efective stress method，the formula of negative friction resistance of pile foundation after creep stability in high fill loess site was modified.The results show that the displacement of the pile body lags behind the setlement of the backfill soil around the pile.The change of the pile diameter will cause large settlement and internal force increment of the pile foundation.The axial force of the pile body after creep stability is quite diferent from that without creep. The negative friction coeficient of pile foundation is about 0.30-0.61 times of pile diameter after creep stability in high fillsite，which leads to the decrease of bearing capacity of pile foundation more obvious，and seriously endangers the long-term safety performance of pile foundation in high backfill site.

Key words：high-filled loess site ； rock-socketed pile;creep； pile-soil interaction； negative friction resist-ance

为了在西北地区“沟壑纵横”的地形上提高土地利用率，在现有沟谷地形上平山、填沟造地形成了高回填场地。（剩余12680字）