Abstract
This paper uses Indraratna seepage theory, Han pile-soil seepage theory and composite foundation theory to establish three plane strain models. Through finite element calculations, the changes in pore pressure and settlement are compared, and the following laws are found: (1) The model established by the composite foundation theory cannot reflect the objective laws of seepage and deformation; (2) In the case of multiple piles, there is no difference in settlement between Han pile-soil seepage theory considering the bearing characteristics of gravel piles and Indraratna seepage theory without considering the bearing characteristics of gravel piles. (3) The settlement value obtained by the principle of composite foundation is much smaller than the settlement value obtained by the separate calculation of pile and soil.
Highlights
Nowadays, in engineering design, the foundation reinforced by gravel piles is generally analyzed based on the theory of composite foundation
Some researchers have adopted the method of separate calculation of piles and soils, using the plane strain model of gravel piles to strengthen the foundation for calculation and analysis
It can be seen from the figure that under the condition of separate calculation of pile and soil, there is a clear gap between the pore pressure of gravel pile and the soil between piles
Summary
Assuming that the gravel piles are distributed like plum blossoms, the spacing of gravel piles is 4m, and the effective pile diameter is 1m, the influence radius of a single gravel pile is 2.1m. The conversion formula given by Tan [3] is converted into an equivalent plane strain model, the 1/2 pile spacing B is 1.86m, the gravel pile radius Bc is 0.10556m, and the soil thickness is 10m. Due to the axis symmetry, 2.5 piles are selected in the figure
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