Investigation Into A Modified Load Transfer Model of Pile-Soil Interface Based on Disturbance Theory and Its Application
The pile-soil contact relationship simulated by the hardening model,hyperbolic model,exponential model,and softening model suffers from the problems of difficult parameter values and large errors.In order to carry out an in-depth study on the strength and deformation mechanism of soil-structure contact surface,a modified pile-soil contact surface load transfer model was established based on the perturbation theory,assuming that the shear strength of the contact unit in the intact state obeys the linear elasticity model,while the perturbed part obeys the plasticity model.The parameter analysis of the model shows that the parameters k and η exert a significant impact on the model τ-s curve shape,while the parameters rf andζ have little effect on the model τ-s curve shape.Afterwards,the correlation between shear stress and shear displacement on the contact surface was quantified through a large-scale indoor direct shear test on the pile-soil contact surface,and the internal computational parameters of the modified pile-soil contact model were further determined.The results show that the model τ-s curves agree well with the test curves,which verify the rationality of the model.The perturbed pile-soil contact model is able to describe both the softening and hardening characteristics of the pile side strain,which helps to understand the strength calculation and deformation mechanism of the pile-soil contact surface under complex stress conditions.
pile-soil interfacedisturbance transitiondirect shear testload transferconstitutive model
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维普
