Taking a foundation pit project of Chongqing Rail Transit Line 24 as the research object,a three-dimensional numerical model is established using ANSYS finite element software to analyze the deformation characteristics of the retaining structure during the excavation process.The study shows that when the foundation pit is excavated to the design depth,the maximum horizontal displacement of the retaining piles is 28.5 mm,with a measured value of 26.8 mm,resulting in an error within 6％;the maximum surface settlement occurs 2 m away from the edge of the foundation pit,with a maximum value of 22.6 mm.Further parameter analysis indicates that when the diameter of the retaining piles is increased from Φ700 mm toΦ900 mm,the maximum horizontal displacement decreases by 25.8％;compared with overall excavation,adopting a zonal excavation method can reduce the maximum horizontal displacement by approximately 22.3％;and when the soil elastic modulus is increased from 15 MPa to 35 MPa,the maximum settlement decreases by 31.3％.The research findings can provide a reference for the construction of deep foundation pits for urban rail transit stations.
关键词
深基坑/变形控制/数值模拟/监测分析/参数影响
Key words
Deep Foundation Pit/Deformation Control/Numerical Simulation/Monitoring Analysis/Parameter Influence
维普
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