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With the development of the city , the development and utilization of underground space has been vigorously promoted , has become one of the topics of urban construction geotechnical pit . Excavation engineering are often in a city densely populated areas , and construction , not only to ensure a stable foundation pit , but also to meet deformation requirements to ensure the safety of the pit around the original buildings , structures , underground pipelines and road . Is adjacent to the excavation engineering of existing pile foundation , due to the role of soil displacement induced by excavation , the force-deformation characteristics different from traditional active Loaded Pile , is typical of passive pile . This paper summarizes the existing passive pile analysis theory and method based on combined with an underground passage the pit excavation instance , professional software build of the application of three - dimensional finite difference numerical analysis model . The numerical analysis results consistent with field data , indicating that building a numerical model can effectively simulated excavation adjacent pile group . On this basis , for the typical soft soil in Changzhou , simulation analysis pit excavation adjacent to existing pile group settlement , horizontal displacement , bending moment , the axial force of the impact and comparative analysis , and single pile with the same position . Then single factor analysis , analysis of the stiffness of the building envelope , pit passive reinforcement pit outside the active area reinforcement , pile pit distance , building envelope insertion than factors such as the impact of changes in the law on the adjacent pile group , get some meaningful conclusions on the design and construction of deep excavation engineering . Finally , the proposed protective recommendations to reduce or eliminate the pit excavation adjacent pile foundation .
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