软粘土中水平荷载模型桩的试验研究

Experimental investigation on lateral load model pile in soft clay

对水平静力荷载作用下软粘土中导管架海洋平台桩基的模型进行了试验研究。用多项式拟合法和加权残值法(WR)对试验数据进行处理,得到了土抗力的分布,并对两种方法进行了比较。将利用加权残值法得到的p-y曲线与API建议的软粘土p-y曲线进行了比较,并根据试验数据用折减系数法对API建议的软粘土p-y曲线进行了修正。研究结果表明,加权残值法比多项式拟合法得到的土抗力分布曲线更合理,试验软粘土的p-y曲线在泥面附近处低于API建议曲线,由修正的p-y曲线得到的模型桩的数值分析结果与试验值吻合较好。

An experimental investigation on offshore model pile embedded in soft clay was carried out under lateral static loads, Two interpolation methods which are polynomial interpolation method and weighted residuals （WR） method were selected to fit the measured results and calculate the lateral soil resistance, Based on the experimental results, the p-y curves of soft clay for static loading derived by WR method were compared with the API recommended ones. According to the experimental data, the API recommended p-y curves of soft clay were modified by using reduction factors method. The results show that the WR method presents more reasonable curves than polynomial interpolation method. And the measured p-y curves above 3-D near the ground surface are lower than API recommended ones. And the numerical analysis results of the model pile by using the modified p-y curves are in good agreement with the experiment results.