Improved calculation model of load sharing of pile-supported reinforced cushion embankment
The key load transfer mechanism in pile-supported reinforced cushion embankment is a combination of various phenomena,including soil arching effect in embankment filling,tensile membrane effect of reinforced cushion and supporting effect of foundation soil.However,the current research in this aspect is not perfect.In this paper,firstly,the improved Hewlett soil arch model based on the consideration of the degree of passive earth pressure and the non-uniform distribution of soil stress between piles was used as the improved carrier.Secondly,it was assumed that the reinforced cushion was a simply supported beam subjected to uniform load at the upper and lower parts.At the same time,considering the correlation between the soil reaction force and the deformation at the maximum deflection of the beam,an improved load sharing computation model of pile-supported reinforced cushion embankment was set up,and the foundation reaction coefficient was introduced.Finally,the credibility and accuracy of the computation model was proved by engineering examples and model parameter analysis.The results show that in the process of embankment filling,the soil arching effect is gradually fully exerted,thus promoting the transfer of embankment load to the pile.With the consolidation of the foundation soil,the embankment load borne by the pile body gradually increases.The height of embankment fill,the internal friction angle of fill and the pile spacing have great influences on the load sharing of piles,while the tensile strength of reinforcement has little effect on it.
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