Application Of Deep Excavation Deformation Ahead Of Forecast

In order to alleviate the phenomenon of the urban land became less and less, some basement, metro, etc sharply increased, the number of underground engineering and foundation pit engineering in depth is more and more deep, proportion is more and more big.At the same time, the construction is surrounded by lots of buildings, the construction is limited by various conditions, so it need to be more strict construction requirements.Deep foundation pit engineering in construction process will lead to a series of deformation, such as the displacement of foundation pit retaining structure, uplifts of foundation pit, settlement of surrounding structures, etc, if deformation value beyond a certain range will damage the stability of foundation pit and surrounding building, seriously,it will cause a series of engineering accidents.In order to avoid engineering accident to a great extent, in front of the foundation pit excavation, we can adopt forecast analysis to simulate the process of foundation pit excavation and measures against possible problems;according to the demand of the informationization construction, we must expand the construction monitoring in construction process, at the same time, we need to compare the construction process of monitoring data with simulated prediction results, according to the results of the comparison, we can verify prediction data repeatedly and correct prediction model, to achieve the requirement of the dynamic construction.In this article, using finite element method which is used to the numerical simulation,based on deep foundation pit engineering project of a subway station in Shijiazhuang, we need to establish the excavation and supporting of the simulation model of the project,through simulation analysis of the foundation pit horizontal, vertical displacement and deformation of axial force, the deformation of foundation pit to make effective simulation and prediction, and feedback in design, thus can better optimization design, optimization of cost.The finite element software can be well carried out on the step-by-step excavation bracing deep foundation pit engineering simulation, reflect the characteristics of stress and displacement in the process of excavation pit deformation, which can realize the prediction of deformation of foundation pit engineering in advance, in order to reduce the risk of accidents in the construction, it is of great theoretical and practical significance to the construction safety of Shijiazhuang subway deep foundation pit projects in the future.