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基于虚土桩模型及荷载传递法,针对理想弹塑性荷载传递函数,推导了均质地基中以桩侧土塑性发展深度为变量的桩顶荷载-沉降曲线计算方法,且进一步利用递推方法将其推广到层状地基中并给出了桩身轴力及桩侧摩阻力的计算方法。在此基础上,给出了荷载传递模型参数的选取方法并分析了虚土桩计算长度的影响因素及取值方法。然后,利用该算法分析了桩及虚土桩压缩模量对荷载-沉降曲线的影响。最后,结合工程实测数据,对比了计算荷载-沉降曲线、实测曲线和由规范方法得到的荷载-沉降曲线,结果表明:在一定的荷载范围内,采用基于虚土桩模型的单桩沉降计算方法计算得到的桩顶沉降值与实测值较为吻合,实际工程应用优于规范法。
Based on the model of soil-soil pile and load transfer method, the calculation method of pile-top load-settlement curve with variable depth of soil plasticity in homogeneous soil is derived for the ideal elasto-plastic load transfer function. Furthermore, recursive method It is extended to the layered foundation and gives the calculation method of pile axial force and pile lateral friction. On this basis, the selection method of load transfer model parameters is given and the influencing factors and the method of calculating the length of virtual soil piles are analyzed. Then, the influence of the compressive modulus of piles and soil piles on the load-settlement curve is analyzed by using this algorithm. Finally, the calculation load-settlement curve, the measured curve and the load-settlement curve obtained by the standard method are compared with the actual measured data. The results show that within a certain load range, the calculation method of single pile settlement based on the model of virtual soil pile The calculated pile top settlement value is in good agreement with the measured value, and the practical engineering application is superior to the standard method.