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随着桩基技术的不断发展,灌注桩在工程中的应用也越来越广泛,但是关于灌注桩承载机理,特别是桩端土层对整体承载力影响的研究还不彻底。本文结合具体的灌注桩现场试验和模型试验数据,结合相关文献,对试验中桩侧摩阻力在桩端附近得到加强的情况进行了详细的数值分析,发现桩侧摩阻力在桩端处的加强是普遍情况,并且桩端土力学性能越强,这种加强效应越明显。最后结合几种桩侧摩阻力在桩端附近强化理论的介绍,将试验数据与理论依据结合起来说明了桩端土对桩侧摩阻力的普遍影响。
With the continuous development of pile foundation technology, the application of cast-in-situ piles in engineering is also more and more widely. However, the research on the bearing mechanism of piles, especially the effect of pile-end soil on the overall bearing capacity, is still incomplete. In this paper, a detailed numerical analysis of the pile-side frictional resistance strengthened in the test is carried out based on the field test and the model test data of the bored pile in combination with the relevant literatures. It is found that the pile-side frictional resistance is strengthened at the pile end Is common, and the stronger the mechanics of pile tip soil, the more obvious this strengthening effect. Finally, combining the introduction of several strengthening theories of pile friction in the vicinity of pile tip, the test data and theoretical basis are combined to illustrate the universal influence of pile tip soil on friction resistance of pile side.