Design And Practice Of Semi-inverse Deep Foundation Pit

Nearly thirty years, China’s urbanization process has been in continuous development. This leads to the demand of the urban space increasing, but the lack of land resources in China, so the development and utilization of urban underground space become inevitable trend. The foundation pit engineering is certain to be referred to the development of underground space. Especially after entering the 21 st century, foundation pit engineering presents the following features: Large area, deep,more function, Complicated engineering environment. The security and sustainable development of foundation pit engineering construction has become a focus, it is of great significance to the development of society.At present, the foundation pit engineering design usually adopts temporary support structure. However, for the deep buried underground structure, the foundation pit engineering with conventional method of temporary support will have the following questions: big material consumption, high cost, small stiffness and so on. Uni-axial and half uni-axial is a new kind of foundation pit design and construction technology. Its core idea is using the main structure of the proposed underground as foundation pit supporting structure in different degrees. This approach abandons the thought of the separate consideration of foundation pit supporting and underground theme, considers both of them, and is an effective method of construction of multi-storey underground structure.Based on the foundation pit supporting project for Haoli garden five phase of the project, this article uses half a uni-axial calculation deep foundation pit of deep foundation pit and design of key nodes. This article analysis and research on the key construction steps in detail, Put forward special construction control index in the process of half a uni-axial, finally to design foundation pit monitoring. Mainly include:(1) Comparison and analysis the feasibility and economy of the technical scheme, and choose good support scheme.(2) Using Lizheng software do the two dimensional calculation, and using Plaxis analyzed typical support section. Three methods are analyzed to ensure the safety and rationality of the design of foundation.(3) Designing the key nodes of engineering.(4) This paper comprehensively introduces the projecthalf uni-axial process and each component construction control index.(5) According to the national standard, do the foundation pit monitoring design.Project of this paper is half uni-axial try the practice of excavation engineering, has a certain reference of similar projects in the future.