煤矿建设中水平受荷桩p-y曲线的确定方法分析

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。

Determination Method Analysis of Level Loaded Pile p-y Curve in Coal Mine Construction

P-y curve method is a main way to analyze the pile foundation level load-bearing characteristics.It is very difficult to measure horizontal soil resistance P in direct in the pile soil interaction model test.First,the methods to determine soil resistance;polynomial interpolation method,weighted surplus method and 3-spline interpolation method are explained;Second,based on the model test measured data and the theory data of finite element back analysis,the soil resistance is calculated with three methods respectively,and the three calculation results are compared and analyzed;Eventually 3-spline interpolation method is determined as the most reasonable calculating method;At last the method of determining pile displacement y according to pile body bending moment is analysed.