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本文通过抗滑桩的室内模型试验,研究固定滑动面的软弱央层的变形性质对桩前土抗力分布的影响,同时也研究该夹层性质与桩在锚固层中转动点的位置、桩身最大弯矩位置等的关系。在实验过程中,根据相似理论设计了模型砂的密实度,使实验结果更具有实际意义。文中根据试验数据,采用桩的横向土抗函数R=y~a(k_1w—k_2w~3),通过非线性规划,计算出上下土层的抗力参数。在运算过程中,运用“拟线性化法”和“补充函数法”,使两点边值问题的非线性微分方程组得到解答,从而求得桩轴弯矩和变位的非线性理论解,并与实测数据进行对比,结果比较满意。对于土的抗力参数与较弱央层的变形参数的相互关系也作了分析,从而能阐明部分参数的力学意义。
In this paper, the indoor model tests of anti-sliding piles are used to study the influence of the deformation properties of the weak central layer of the fixed sliding surface on the resistance distribution of the soil in front of the pile. The properties of the sandwich and the position of the rotation point of the pile in the anchor layer are also studied. Relationships such as bending moment position. In the experimental process, the compactness of the model sand was designed based on the similarity theory, which made the experimental results more practical. Based on the experimental data, the lateral soil resistance function R=y~a(k_1w—k_2w~3) is used to calculate the resistance parameters of the upper and lower soil layers through nonlinear programming. In the calculation process, the “quasi-linearization method” and “supplemental function method” are used to solve the nonlinear differential equations of the two-point boundary value problem, so as to obtain the nonlinear theoretical solutions of the bending moment and displacement of the pile shaft. And compared with the measured data, the results are satisfactory. The correlation between soil resistance parameters and the weaker central layer deformation parameters has also been analyzed, so that the mechanical significance of some parameters can be clarified.