There is a problem of research on the mechanism of uplift bearing and mechanical model of screw anchor with multi-blades in sandy soil.Currently,it is difficult to form a unified understanding of the criteria for artificially introducing critical values to divide the continuous evolution problem into special cases.Based on numerical simulation,the continuous evolution law and theoretical characterization method of the sliding surface of the surrounding soil of screw anchors in sandy soil were analyzed,and further research was conducted on the mechanical model of uplift and the calculation method of uplift bearing capacity of screw anchor with multi-blades in sandy soil.The main conclusions obtained are as follows:1)The bearing characteristics of the head blade only related to their burial depth ratio,which is consistent with the performance of the single anchor blade.2)As the spacing ratio increases,the bearing characteristics of lower anchor blade gradually decrease with the influence of the spacing ratio,until independent bearing;3)The sliding surface of the surrounding soil of each layer of anchor blades can be described by partial ellipses,and when the spacing ratio is small,the ratio of the long and short axes of the ellipse depends on the spacing ratio and is independent of the burial depth ratio;in other cases,the ratio of the long and short axes of the ellipse decreases with the increase of the burial depth ratio;4)The uplift bearing mechanical model of screw anchor with multi-blades can be composed of the bearing models of each layer blade,and the evolution of the mechanical model of lower-layer blade is divided into three continuous stages influenced by the burial depth ratio and spacing ratio;5)Comparison calculations with three experimental cases prove the rationality of the continuous evolution+combination mechanical model construction approach,and the corresponding bearing capacity calculation method also has good accuracy and stability.
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