Analysis on Stress and Deformation Rules of Locking Steel Pipe Pile Cofferdam in Deep Foundation Excavation with Sand Layer
The deep foundation excavation of Xi'an Metro Line 10 locates in the special water-rich sand layer in northwest China,the sand layer has the characteristics of strong permeability,low cohesiveness and poor self-stability,in order to ensure the safety of locked steel pipe pile cofferdam structure during the construction for geological deep foundation excavation,through 3D numerical simulation and field monitoring methods,the horizontal displacement,axial force of inner support and surrounding surface settlement of latched-steel pipe pile cofferdam caused by foundation excavation are studied.The strength,stiffness and stability of locking steel pipe pile cofferdam during construction of deep foundation excavation all meet the specification requirements,and the finite element calculation value is basically the same as the measured pile displacement distribution law,with the excavation of the foundation excavation.As the depth deepens,the side slope curve of the pile body takes on a bulging shape with small deformation at both ends and large deformation in the middle.The support axial force in the first layer of the steel cofferdam shows a trend of first increasing and then decreasing,the cumulative change time history curve of surface settlement is a settlement type,the pile deformation and surface settlement on the side of foundation excavation facing the river are larger than those on the side of the foundation excavation away from the river.
deep foundation excavationsimulationmonitoringdeformationconstruction
万方数据
维普
