Finite Element Analysis And Deformation Monitoring Of Retaining Structure Of Deep Foundation Pit On Tianjin Hospital

As one of the key issues for research of geotechnical engineering, Deepfoundation pit engineering has been people focused on. Excavation engineeringmainly includes the excavation, design of retaining structure and design of supportingsystem. Which scheme design of Foundation pit excavation is reasonable and erectionof the enclosure system is success are closely linked. For example, erection ofretaining structure is failure such as a large deformation of the foundation pit. One ofthe reason may be design of excavation foundation is unreasonable. At the same time,in the process of foundation pit excavation and support establish, we should be timelymonitoring and the use of information management as far as possible. In theconstruction of Deep foundation pit, we must ensure that environmental is safety andconstruction is safety. Study on ground movement around deep excavation and thestability of the support system is very necessary.Depend on the Tianjin hospital construction project, used the analysis methodsthat associated the real-time monitoring of construction site and deformation theory ofretaining structure of foundation pit, This paper analyzed the research. In the field,based on summing up the existing successful examples, we research horizontaldisplacement and vertical displacement in top of the enclosure piles and deephorizontal displacement of enclosure structure and so on in the process of Foundationpit excavation. And by using the finite element software PLAXIS, retaining structuredeformation and stress is analyzed by finite element method the foundation pitexcavation retaining structure step by step in the process of deformation and stress isanalyzed by finite element method in the foundation pit engineering step by stepexcavation process. The main research works of this thesis are as following:1、 Based on the analysis of the field monitoring data, an overview of variationof the deep foundation pit monitoring arrangement, the deformation of the retainingstructure and soil displacement was monitored., a preliminary analysis of retainingstructure of deep foundation pit horizontal displacement, vertical displacement, deephorizontal displacement, supporting, and supporting axial force at different depths anddifferent period of time on Tianjin hospital were demonstrated.Through the controlstandard, monitoring data will be restricted in the alarm value, to provide protection for the safe construction.2、According to the foundation pit engineering, using the finite element softwarePLAXIS, calculation model on the foundation pit excavation was established and wascalculated. This paper briefly summarized the PLAXIS characteristics, modelingmethod and selecting rational parameters, at the same tame, calculated internal forceand lateral displacement of the retaining structure.3、Through contrasted the calculated results with the actual monitoring results,the change trend is consistent, it show that numerical simulation meet actual situation.In this paper, the method of numerical simulation, analysis of results and caseprovide experience and reference.