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Y形桩作为一种新型反拱曲面异形桩,端阻力在桩身截面上具有不均匀分布的特性。虽将端阻力假定为均匀分布,与假定为集中力相比,附加应力计算结果更符合实际分布规律,但仍存在一定偏差。基于数值模拟结果,建立了Y形桩端阻力的不均匀分布模型,借助数学分析软件Mathematica的NIntegrate数值积分功能,以及Geddes推导应力解的思想,进而得出了考虑异形效应Y形桩桩端阻力作用在地基内部任意点竖向附加应力系数的数值计算方法。以主要影响因素外包圆半径R、模板弧度θ、开弧间距s、夹角弧度δ为变量,分别对比研究了将Y形桩端阻力假定为均匀分布和考虑异形效应的不均匀分布两种模式下附加应力的变化规律,并将考虑异形效应的端阻力产生附加应力计算方法用于沉降计算。对此现场静载荷试验数据表明,考虑异性效应的端阻力产生附加应力计算方法计算沉降与现场试验数据吻合度更高。
Y-shaped piles as a new inverted arch curved surface shaped pile, the end resistance in the pile section has uneven distribution characteristics. Although the end resistance is assumed to be uniformly distributed, compared with the assumption of concentration, the additional stress calculation results are more in line with the actual distribution, but there is still some deviation. Based on the numerical simulation results, an inhomogeneous distribution model of Y-shaped pile tip resistance is established. By means of Nintegrate numerical integration function of mathematical analysis software Mathematica and Geddes’s concept of stress solution, the end resistance of Y- A Numerical Method for Calculating Vertical Additional Stress Coefficient at Any Point in Foundation. The major influencing factors are the radius R, the curvature of the template θ, the arc spacing s and the included angle δ as the variables. The two models of Y-shaped pile end resistance are assumed as uniform distribution and non-uniform distribution considering heteromorphism effect respectively Under the additional stress changes, and will consider the special effects of end-drag generating additional stress calculation method for settlement calculation. The field static load test data show that considering the effect of heterosexual end resistance generate additional stress calculation method to calculate the settlement and field test data higher coincidence.