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p-y曲线法是分析桩基水平承载特性的主要方法。对于矿井建设而言在桩土相互作用模型试验中直接量测土层水平抗力p很困难,往往只能由实测桩身弯矩来推求土层水平抗力p值。文章首先对确定土抗力常用的多项式插值法、加权余量法和三次样条插值法的原理和特点进行了阐述;其次,依据模型试验的实测数据和有限元反分析的理论数据分别用3种方法计算土抗力,并对3种计算结果进行比较和分析,确定三次样条插值法是最合理的计算方法;最后分析了根据桩身弯矩确定桩侧位移y的方法。
The p-y curve method is the main method to analyze the horizontal bearing characteristics of pile foundation. For mine construction, it is very difficult to directly measure the soil horizontal resistance p in the soil-pile interaction model test. The p-value of soil horizontal resistance can often only be determined from the measured pile bending moment. Firstly, the principles and characteristics of polynomial interpolation, weighted residual method and cubic spline interpolation, which are commonly used to determine soil resistance, are described. Secondly, based on the measured data of the model test and the theoretical data of the finite element inverse analysis, Method to calculate the soil resistance and compare and analyze the three kinds of calculation results to determine the cubic spline interpolation method is the most reasonable method of calculation. Finally, the method of determining pile displacement y based on pile bending moment is analyzed.