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基坑、隧道的开挖将不可避免地影响邻近受荷桩基的工作性能,如何合理评价开挖条件下邻近受荷桩基的附加响应至关重要。针对Winkler地基梁模型的不足,提出了一种改进的非线性两阶段分析方法,该法能够合理地考虑桩土作用的非线性特征、桩顶工作荷载对桩身附加轴力的影响及轴力产生的偏心弯矩对水平挠曲的影响等,并给出了该改进算法的增量法求解过程。同时将本文方法与已有研究成果进行了对比,验证了本文方法的合理性,并进一步探讨了桩顶工作荷载对竖向附加响应及轴向力对水平附加响应的影响规律。结果表明:桩顶工作荷载对竖向附加响应的影响是显著的;而轴向力对水平挠曲的影响程度则与自由场位移模式等相关,对于部分位移模式,影响也很显著。
Excavation of foundation pit and tunnel will inevitably affect the working performance of adjacent loaded pile foundation. How to reasonably evaluate the additional response of adjacent loaded pile foundation under excavation condition is very important. Aiming at the shortage of Winkler foundation beam model, an improved nonlinear two-stage analysis method is proposed, which can reasonably consider the nonlinear characteristics of pile-soil interaction, the influence of pile-top working load on the additional axial force of the pile and the axial force The influence of eccentric moment on the horizontal deflection and so on, and gives the incremental method of the improved algorithm to solve the problem. At the same time, the method in this paper is compared with the existing research results to verify the rationality of the method and to further investigate the influence of working load on the vertical additional response and axial additional response. The results show that the effect of pile working load on vertical additional response is significant. The effect of axial force on horizontal deflection is related to the free-field displacement mode and so on, and the effect is also significant for partial displacement mode.