Study on Calculation Method of Pile-soil Stress Ratio of Bidirectional Reinforced Composite Foundation
Research purposes:Pile-soil stress ratio is an important index to reflect the working characteristics of bidirectional reinforced composite foundation.Due to the complexity of the bearing deformation mechanism of bidirectional reinforced composite foundation under embankment load,this paper takes the embankment and bidirectional composite foundation in the range of double piles as the research object.Considering the combined effects of multiple effects such as embankment soil arching effect,reinforced layer mesh effect and stress diffusion effect,a two-dimensional theoretical analysis model of embankment-horizontal reinforced cushion-vertical pile-soil coordinated deformation is established to explore the influence of various influencing factors on pile-soil stress ratio.Research conclusions:(1)The pile-soil stress ratio decreases with the increase of filling weight and pile spacing.With the increase of the internal friction angle of the filler,it increases first and then decreases.It increases with the increase of embankment filling height,the number of grid layers and the cohesion of filler.(2)The sensitivity of pile-soil stress ratio to each parameter from high to low is:pile spacing,embankment filling height,embankment filling weight,embankment filling cohesion,grid layer number and embankment filling internal friction angle.(3)The research results can provide theoretical basis and engineering reference for the calculation of pile-soil stress ratio of similar projects.
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