Analysis of the Impact of Deep Excavation on Adjacent Rail Transit Structures
In order to understand the influence of deep foundation pit excavation on adjacent existing track structure and electric tower,the deformation control measures were taken.Based on engineering examples,a three-dimensional dynamic and static fine analysis model of foundation pit,subgrade,via-duct and electric tower is simultaneously constructed by using the modified Mohr-Coulomb(MM-C)constitutive model with considering the double-hardening characteristics of soil,to reveal the excava-tion deformation law of foundation pit under the conditions of with and without support.The influ-ence range of deep foundation pit excavation is proposed to be 4 times the depth of foundation pit exca-vation.It is suggested that the safety protection zone for similar rail transit projects should be 4 times the excavation depth of the foundation pit outside the outer edge of the track structure.The deforma-tion of the soil on the side of the foundation pit under the obstruction of the bridge pile foundation is smaller than that of the soil between the piles.Conversely,the bridge pile foundation is affected by the additional stress of the soil,and the design needs to be strengthened.Based on the deformation control of adjacent track foundation pits,a support form of row pile with anchor cable is proposed,which can greatly control the disturbance of excavation to the surrounding environment and ensure the safety of track operation.
deep foundation pit excavationrail transitnumerical simulationinfluence analysis
万方数据
维普
