基于修正系数法的桩基水平静载试验参数分析

Parameter Analysis of Horizontal Static Load Test of Piles Under Correction Coefficient Method

为分析桩基水平静载试验下地基参数取值,根据m法开展桩土相对刚度变化对地面处位移、转角和最大弯矩影响敏感性分析研究。采用桩的理论抗弯刚度对综合刚度原理和双参数法模型进行修正,提出基于m法的修正系数法计算模型,该法能够保证地面处的位移和转角理论值与实测值相符。结合算例,通过弯矩理论值和实测值对比,验证该法的合理性。算例分析表明,桩身最大弯矩理论值较m法误差小且弯矩沿深度分布较m法合理,修正系数法能够更好地模拟桩土的实际工况。

To analyze foundation parameters by horizontal static load test of piles,the research on sensitivity analysis of the effect of relative stiffness of soil to piles on displacement of pile top,angle and the maximum moment was developed under m method.Theoretical bending stiffness was used to modify the model of composite stiffness principle with biparameter,then the model of correction coefficient method was put forward based on m method and the theoretical values of ground displacement and angle were same to the measured values by this method.The feasibility analysis of the correction coefficient method was verified with cases through comparing the differences between theoretical moment and actual measured moment.The case study indicates that the error of the theoretical maximum moment is smaller and distribution of pile bending moment along depth is comparatively rational compared with m method.The correction coefficient method can preferably describe practical working conditions between piles and soil.