Numerical and Measurement Analysis of the Influence of Deep and Large Foundation Pit Excavation on Adjacent Viaduct Pile Foundation
In order to study the influence of deep and large foundation pit excavation on adjacent viaduct piles,taking the Chenzhai Station of Zhengzhou Metro Line 7 as the project background,numerical simulation was used to study the influence of different support systems and parameters on adjacent pile foundations during deep and large foundation pit excavation.The reliability of the numerical simulation results was verified with on-site measured data.The research results indicate that the greater the thickness of the diaphragm wall,the smaller the horizontal and vertical displacement of adjacent viaduct piles,showing a"negative correlation"relationship.The impact of the thickness change of the diaphragm wall on the bridge piles is mainly reflected in the vertical displacement;The presence of pre applied axial force on the internal support can control the horizontal displacement of adjacent bridge piles,but the effect of changing the pre applied axial force on the displacement of adjacent bridge piles is weaker than changing the thickness of the diaphragm wall;During the excavation process of the foundation pit,the vertical displacement of adjacent bridge piles shows a trend of"settling first and then rising",with the main impact area being 18 m(one time the excavation depth of the foundation pit)near the foundation pit.
pit excavationpile foundationnumerical simulationthe underground diaphragm wallthe pre-axial force
NETL
NSTL
万方数据
