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在分析隧道开挖条件下邻近桩基的水平反应时,基于考虑桩土界面非线性的p–y曲线,引入统一极限桩土相互作用力的概念,利用有限差分方法通过迭代求解给出隧道开挖与邻近单桩相互作用的弹塑性解答。在群桩计算中引入考虑群桩效应的p–因子(fm),从而得到群桩中各单桩的p–y曲线,进而通过有限差分方法求得考虑轴力情况下群桩中各单桩的变形、转角、弯矩和剪力。同时通过已有试验和实测数据对本文方法进行验证分析,结果表明:本文方法与试验与实测结果得到了较好的一致性;分析隧道开挖条件下邻近桩基的水平反应时,群桩中的第一排桩与同位置处的单桩性质相似,后排桩由于群桩效应的存在受到的影响将明显小于前排桩。
In the analysis of the horizontal response of adjacent pile foundations under tunnel excavation conditions, the concept of unified limit pile-soil interaction force is introduced based on the p-y curve considering the nonlinear pile-soil interface. By using the finite difference method, the tunnel opening Elasto-plastic solution to the interaction of adjacent monopiles. The p-factor (fm) considering the pile group effect is introduced into the pile group calculation to get the p-y curve of each pile in the pile group, and then by the finite difference method, The deformation, corner, bending moment and shear force. At the same time, the method of this paper is validated by the existing test and measured data. The results show that the method is in good agreement with the experimental and measured results. When the horizontal response of adjacent pile foundations in tunnel excavation is analyzed, The first row of piles is similar in nature to the single pile at the same position. The effect of pile group effect on the back row of piles will be significantly less than that of the front row of piles.