Finite element analysis of load transfer law of prestressed pipe piles in substation foundation in complex site
In the construction of substations and other projects in mountainous areas,the problem of complex site foundation is often en-countered.The slope soft soil foundation is one of the special foundations.It has unique engineering characteristics and brings great dif-ficulties to the construction of the substation.In order to study the reinforcement effect of prestressed pipe piles on the basis of complex sites and guide the design of prestressed pipe piles,the finite element software was used to establish the model of slope soft soil founda-tion reinforced by prestressed pipe pile,and the influence of different pile spacing and pile length on the safety factor of embankment was studied.The load transfer law,settlement of prestressed pipe pile and failure mechanism of embankment were analyzed.The results show that setting prestressed pipe piles in inclined soft soil foundation can effectively reduce the deformation of the foundation and im-prove its stability.The change of pile spacing and pile length has a significant effect on the reinforcement effect.With the decrease of pile spacing and the increase of pile length,the deformation of inclined soft soil foundation decreased gradually,and the safety factor of embankment increased gradually.The pile length should be deep below the embedded layer,and excessive reduction of pile spacing does not significantly improve the reinforcement effect.The pile foundation in the middle of the embankment mainly provides bearing capacity and produces large vertical displacement.The pile foundation on both sides mainly provides anti-sliding force and produces large lateral displacement.The axial force of the pile body increases first and then decreases along the pile body.Taking the bottom surface of the soft soil layer as the dividing line,the upper pile body is opposite to the lower pile body under shear stress,and the main stress part is concentrated at the pile end.In related projects,the parameters of pile length,pile number and pile spacing of pile-supported slope soft soil embankment can be reasonably designed according to the needs to achieve a more economical and reasonable reinforcement scheme.
prestressed pipe pileinclined soft soil foundationsstrength reduction methodload transfer lawfinite element analysis method
NETL
NSTL
万方数据
