Study On The Safety Of The Pile-Anchor Supporting Structure About Deep Excavation

With the development scale of the high-rise buildings, subway projects, municipal projects and the underground space increasing, Foundation works have increased drastically for nearly 10 years. Pile - anchor supporting structure also has been widely used as an important supporting structure with the advantages of strong adaptability. But limited by some factors such as the features of foundation and the existing theory, the project accidents caused by design or construction account for a sizeable proportion of foundation accident. Based on those reasons, the main research contents of this paper including:1) By combining the features of excavation to analysize the reasons of accidents, author introduces the basic requirements of excavations security and the early-warning value, and summes up the research status about pile-anchor supporting structure;2) Summed up the characteristics, scope of application, categories and construction technology about pile and anchor, and discussed the construction requirements and mechanism on pile-anchor supporting structure;3) Through the analysis and discussion on design methods and theory, the calculation way is determined in the paper as well as the statement of the significance of related parameters;4) Based on the project examples, through combination of the measured values, author compares differences on the calculation about deformation and stress of the plane-elastic foundation method with FLAC3D calculation method, analyzes the reasons about differences, and provides suggestion for project;5) Based on the project examples, author uses the FLAC3D software to simulate and analyze those examples, discusses the safety influence about supporting structure which is affected by the the design parameters (including the anchor design parameters, the concrete of pile design parameters);6) Based on the project examples, discussed the influence about supporting structure which is affected by the nature, intensity, width and location of the the overloading;7) By combining with the construction technology of pile-anchor structure, to aggregate the notes and security measures in the construction of the pile-anchor about deep excavation, for providing suggestion about security assurances in the construction of the pile-anchor.