Analysis of Negative Friction Resistance of Pile Group Foundation in Large Collapsible Loess Site
In order to analyze the negative friction resistance of pile group foundation before and after flooding in loess area,finite element simulation method is used to analyze the pile soil settlement,negative friction resistance and axial force of pile group.The results show that the ultimate load capacity of pile group is 45 kN;The soil settlement around pile of all piles decreases with increasing depth.When the depth from pile top is less than 20 m,the soil settlement around pile of central pile is the smallest.When the depth from the pile top is greater than 20 m,the soil settlement around the central pile is the largest.The friction resistance of corner pile,side pile and center pile after water immersion is 40%,38%and 33%higher than that of front corner pile,side pile and center pile respectively.The axial force of pile body decreases with the increase of pile top depth before water immersion,while the axial force of pile body increases first and then decreases with the increase of pile top depth after water immersion.The axial force of corner pile,side pile and center pile after water immersion is higher than that before water immersion.
Collapsible loessPile group foundationNegative friction resistancePile axial forceBearing capacity
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