Dynamic interaction between adjacent piles considering soil shear effect in layered foundation

Based on Winkler foundation model, the second soil elastic parameter was included in which the shear effect of layered foundation is included. The differential equation of the pile horizontal damped vibration in the two-parameter layer foundation was solved via the initial parameter method. The transfer matrix method was used to obtain the dynamic interaction factor between adjacent piles. The accuracy of theoretical derivation and calculation program was proved through comparing the numerical results with the published ones. The analysis shows that the interaction factor solved via the two-parameter model is larger than that by the Winkler model. There is more obvious difference between them especially in the homogeneous foundation with low pile-soil elastic modulus ratio, short piles distance and low frequency of exciting loads. The influence of factors on dynamic interaction factors such as the pile-soil elastic modulus ratio, distance and angle between piles, the layered property of the foundation, the aspect ratio and bottom conditions of piles and the dimensionless frequency was discussed. The parameters study demonstrates that distance and angle between piles are the most important factors affecting the dynamic interaction factors. The change of the pile-soil elastic modulus ratio has a little effect on dynamic interaction factors in the homogeneous foundation, while a greatly effect on that in the layered foundation.