Parameter Inversion Method for Laterally Loaded Long Pile Under Two-parameter Foundation
To obtain parameters for laterally loaded long pile with mz+C two-parameter foundation model,based on the principle of m method,the coordinate system was established at zero position of foundation coefficients,and the pile above ground was regarded as a virtual segment.Then,the ground loads were simplified to pile tip according to the theory of equivalent load effect under the combined action of shearing force and moment,and the two-parameter calculation model for laterally loaded long pile was established.Regarding pile-soil relative stiffness and z0 as unknown parameters,the inversion model for foundation parameters was proposed.Soil resistance effect on form of load action,ground displacement and angle was considered by using inversion model.Foundation parameters were inversed according to the measured values of ground displacement and angle.The feasibility of inversion method was verified by the maximum bending moment of pile and resistance of ground soil.The result indicates that the theoretical values of ground displacement and angle are same to the measured values,and calculating errors of the maximum moment and its position are very small with the study method.Compared with m method,the degree of influence caused by increasing ground soil resistance on moment increases first and then reduces varying with depth,and the main influencing area lies nearby the maximum moment.The flexural rigidity of pile is linear with the maximum moment and ground soil resistance,and it has great influence on them and changes in reverse direction.The reasonable value range of flexural rigidity is obtained theoretically according to the measured values of the maximum moment and ground soil resistance.Considering the change of flexural rigidity varying with ground loads or displacement can preferably describe the practical working conditions between pile and soil,and then it can improve calculation accuracy of mz+C model.
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