Grey Correlation Analysis of Deformation Characteristics and Maximum Deflection of Retaining Structure of Open-cut Foundation Pit of Subway Under Existing Buildings
Choosing a reasonable support scheme can effectively control the deformation of the foundation pit and ensure the safety of the existing structure.In this paper,the open-cut foundation pit project of Guangzhou Metro Line 13 underpassing commercial buildings is taken as the research object.The deformation characteristics of the supporting structure are analyzed by means of field monitoring and numerical simulation.The grey correlation analysis(GRA)is introduced to study the key factors affecting the maximum horizontal displacement of the retaining structure.The results show that all monitoring values are far less than the specified warning values.In addition,the reinforced steel pipe piles outside the pit can effectively limit the deformation of the stratum.The main factors affecting the maximum horizontal displacement of the retaining structure are:excavation layer thickness>concrete support concrete grade>cast-in-place pile concrete grade>steel support sec-tion size.
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