基础加固工程中的长短桩竖向承载特性研究

Study on the Vertical Bearing Features of Long-short Piles of the Foundation Reinforcement Engineering

近年来,长短桩在基础加固工程中得到越来越广泛的应用,但其竖向承载特性的研究尚无定论,设计中仍然参考普通桩的计算理论。采用三维连续介质快速拉格朗日法(FLAC3D)对实际基础加固工程中长短桩的竖向承载特性及沉降特性进行了数值模拟,并将模拟结果与参考普通桩计算理论结果进行了比较,两者互相补充与验证。研究结果表明:长短桩沉降值近似相同,但长桩沉降值略大于短桩,桩基变形协调;桩基共同作用下,上部荷载主要由长桩承担。

More and more long-short pile are applied to engineering in recent years. But so far,few people have focused on studing their bearing characteristics. Computational theory of ordinary piles is referenced in the foundation reinforcement design. Vertical bearing and settle- merit features are simulated for long-short piles inthe practical engineering based on the fast lagrangian analysis of continua in three dimensions （FLAC3D）. The comparison between simulation results and the results of computational theory of ordinary piles is conducted and they are compelemented and verified each other. The study show-s that the settlement value of the long-short pile is approximately the same. But the long pile settlement value is slightly larger than the short one. The deformation of the pile is coordinate. Under the interaction of the piles,the upperstructure load mainly beared by the long pile.