Analysis on Mechanical Characteristics and Influencing Factors of Support Structure of Deep Foundation Pit Under Eccentric Pressure Inpebble Stratum
Relying on the project of Zhoushan Avenue undercrossing Kaiyuan Avenue in Luoyang City,the mechanical characteristics and influencing factors of the retaining structure of deep foundation pit under eccentric pressure in pebble stratum are studied.MIDAS GTS NX was used to establish a two-dimensional finite element model,and the lateral displacement,bending moment and axial force of the supporting structure under different conditions were compared.The effects of the position,size,distribution width,and excavation depth h of the deep foundation pit side eccentric load on the deformation of the foundation pit supporting system were discussed.The equation and related coefficients of the pile shaft changing with the conditions were also obtained.The results show that when the surcharge reaches 60 kPa,the displacement of the left pile changes 56.80％,the displacement of the right pile is smaller than the left pile and moves away from the foundation pit,and the pile deformation will reach the early warning value specified in this project when the pit side load is greater than or equal to 105 kPa.The surcharge is highly related to the distance from the pit edge and the lateral displacement of the retaining pile.When the distance from the pit to the surcharge is greater than 1.5 times the design excavation depth,the stress deformation of the retaining structure tends to be stable.When the excavation depth of foundation pit reaches 1.8 times of the design excavation depth,the influence of load distribution width on the cast-in-place pile of foundation pit is almost zero.The comparison and analysis between the measured value and the simulated value verify the accuracy of the method in this paper,which can provide a reference for the eccentric deep foundation pit project.
deep foundation pit in pebble stratumbias surchargesupport systemmechanical characteristicson site monitoringfinite element
万方数据
维普
