Finite element analysis of influence of Permafrost Degradation on Vertical Bearing Capacity of Pile Foundations
In recent years,the global warming is obvious,and the trend of permafrost degradation is significant.To study the effect of permafrost degradation on the vertical bearing capacity of pile foundation.In this paper,a finite element model of pile foundation is established considering the effect of permafrost degradation,and the influence of seasonal active layer thickness on the vertical bearing capacity of pile foundation is analyzed.The results show that the vertical ultimate bearing capacity of pile foundation decreases with the increase of seasonal active layer thickness.Secondly,under the working conditions of active layer thickness in different seasons,the maximum stress of pile foundation all appears at the pile head position,and the minimum stress all appears at the pile bottom position.With the increase of load,the region where the maximum stress appears shows a trend of gradually expanding from the pile head position to the pile bottom position.Finally,when the thickness of the seasonal active layer is the same,as the load increases,the overall soil stress shows an increasing trend,and the positions where the maximum stress occurs all show a trend of transferring from the soil around the pile body to the soil at the pile bottom as the load increases.
bridge engineeringpile foundationpermafrost degradationvertical bearing characteristicsfinite element analysis
万方数据
维普
