Abstract
This paper fits the τ-z curve of a single pile by mathematical methods. Based on the one-dimensional similarity of the τ-z curves, the τ-z curves of single pile under different loads are derived. It studies the distribution of the axial force of a single pile by taking the self-weight of the pile and the pile-end resistance ratio into account and establishes the calculated equation of settlement for single pile. The mutual reinforcing effect between the piles is fully considered, and the settlement of each foundation pile in the pile group is deduced in use of shear displacement method. The example analysis shows that the axial force distribution of single pile considering the self-weight and the pile-end resistance ratio is in good agreement with the experimental data. The settlement error of a single pile calculated by the traditional method is 18.52% compared with measured value. When the self-weight and end resistance ratio are not considered, the error reaches 2.26%. However, the error could reduce to 1.64% when they are taken into consideration. It has a good applicability to calculate the settlement of pile group through the τ-z curves of single pile. Also, it can better forecast the settlement behavior of the pile group under similar conditions.
Highlights
Some methods have been used for the settlement calculation of pile groups. ey mainly include equivalent pier foundation method, layered summation method, load transfer method, and finite element analysis method [1]
A great deal of research has been done on the application of these methods. e equivalent pier foundation method and the layered summation method take the pile group and the cap to be a whole, which is good for calculating the overall settlement of the pile group
It cannot analyze the differential settlement between the piles in the pile group foundation. e load transfer method is very effective in calculating the settlement of a single pile, while it cannot account for the continuity of the soil and the interaction between the pile and surrounding soil as used in group pile calculation. e finite element analysis method can well describe the geometric characteristics of the pile group and the specific parameters of the soil around the pile
Summary
Some methods have been used for the settlement calculation of pile groups. ey mainly include equivalent pier foundation method, layered summation method, load transfer method, and finite element analysis method [1]. E equivalent pier foundation method and the layered summation method take the pile group and the cap to be a whole, which is good for calculating the overall settlement of the pile group. E load transfer method is very effective in calculating the settlement of a single pile, while it cannot account for the continuity of the soil and the interaction between the pile and surrounding soil as used in group pile calculation. Based on shear displacement method, Lin et al [6, 7] proposed a simplified formula of interaction coefficient and established a flexibility matrix equation for pile group settlement calculation. In addition to the load-settlement curve, the τ-z curves obtained from the static load test contain rich information of pile-soil interaction. By comparison with the numerical analysis method, the method proposed in this work greatly saves the calculation time, and the calculated results are in good agreement with test value
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