Load transfer model of sand-concrete pile interface based on disturbed state concept
Based on the concept theory of disturbance state,the influence of density of sand on the disturbance function was considered,and a load transfer model was established for the concrete pile-sand interface.The effect of pile side roughness was described by concrete slabs.Large-scale direct shear tests on the pile-sand interface at different densities were carried out to investigate the influence of sand densities on the mechanical properties of the concrete pile-sand interface.The mechanisms of the initial shear coefficients and the effect of disturbance parameters(A and Z)on the load transfer model of the pile-sand interface were analyzed.The results show that:1)The concrete pile-sand interface is prone to strain softening,and the concrete pile-dense sand interface shows the greatest strain softening under low normal stress conditions.2)The model disturbance parameter Z numerically approximates to the pore ratio.The larger the model disturbance parameter A,the more significant the softening of sand-pile interface.The parameter A increases with increasing denseness.For dense sands,the parameter A decays approximately linearly with normal stress,and for loose and medium dense sands,it decays approximately birefringently.3)The initial shear coefficient ks increases with increasing normal stress,and the greater the denseness,the faster the rate of increase.4)The pile-sand interface load transfer model based on the concept of disturbance state concept is reliable,and the physical meaning of the parameters is clear and easy to determine,which can well describe the mechanical characteristics such as strain softening and hardening of the pile-sand interface.
densitypile-sand interfaceload transfer modeldisturbance state concept
万方数据
维普
