Research on the Characteristics of Foundation Support for Piles with Support at Different Over-excavation Depths
In order to study the influence of over-excavation on the supporting structure of supported foundation pits,we establish the models of foundation pits with one concrete internal support and two concrete internal supports,and analyze the force or deformation patterns of the retaining structure,supporting structure,overall stability safety coefficient,and the surrounding environment of the foundation pits at different depths of over-excavation.The results show that the maximum values of force and deformation of the retaining structure and ground settlement at the edge of the pit occur in the excavation to the bottom of the pit;in the pit supported by two supports,the first layer of support is not affected by the over-excavation of the pit;the maximum force and deformation of the retaining structure,the maximum axial force of the support,and the maximum ground settlement at the edge of the pit increase with the increase of the depth of over-excavation of the pit,and the maximum displacement of the pile body is proportional to the depth of over-excavation;the overall stability safety coefficient of the pit increases with the depth of over-excavation.The overall stability and safety coefficient of the foundation pit decreases linearly with the increase of the over-excavation depth of the foundation pit,but it always meets the requirement of the code for the overall stability and safety coefficient of the first-level foundation pit;the axial force of the support,the ground settlement at the edge of the pit are proportional to the load at the edge of the pit,and the overall stability and safety coefficient of the foundation pit is inversely proportional to the load at the edge of the pit.
deep foundation pitfoundation supportover-excavationforcedeformation
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