Parameter Inversion Method for Three-parameter Model of Laterally Loaded Long Pile Using m Method
To improve the computational accuracy of m method for test piles,the parameter inversion method for three-parameter model of laterally loaded long pile is proposed.It is assumed that the resistance of soil around pile is not zero at ground level,and the foundation coefficient increases linearly along depth.Regarding pile-soil relative stiffness,flexural rigidity,and z0 as parameters,the theoretical model of three-parameter for laterally loaded long pile is established.According to the measured values of ground displacement and angle,the pile-soil relative stiffness,flexural rigidity,and maximum moment are calculated with assuming αz0.Due to the calculated maximum bending moment is close to the measured value,the pile-soil parameters are determined.Then,the bending moment and soil resistance of piles are calculated with pile-soil parameters,and the feasibility of inversion method is verified by parameters distribution.The influence of αz0 change on other parameters under shear force is analyzed based on the theoretical computation model.The result indicates that with the increase of αz0,the pile-soil relative stiffness,flexural rigidity,maximum moment,and value of m all decrease.The ground soil resistance and the value of C both increase,but the maximum soil resistance decreases first then increases.The example analysis indicates that the theoretical values of ground displacement and angle,maximum moment,and position of maximum soil resistance are all same to the measured values by using inversion method.Compared with the measured values of field tests,the maximum error of soil resistance is within 15%,and the error of maximum soil resistance is within 5%compared with the measured value with indoor model test.The moment and soil resistance along depth are more reasonable than those by using m method.Considering ground soil resistance and regarding flexural rigidity as an undetermined parameter can preferably analyze practical working conditions between pile and soil.
bridge engineeringparameter inversionthree-parameter methodlaterally loaded long pilem method
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