Study On Monitoring And Early Warning Technology And Simulate Deformation Laws Of Deep Excavation In Subway Station

The deformation of deep excavation engineering construction is a very important project to safety monitoring. If the deformation value is too large, it will cause the foundation instability or the surrounding building (structure) building material cracking and other accidents, leaded to personnel and the surrounding environment death and destruction. Therefore, It has important project value to study on the deformation laws of deep foundation pit excavation process. In this paper, a deep excavation of the Dalian metro as the background for the study, based on theoretical analysis, compared field monitoring and numerical simulation results, study on deformation law of Metro Deep Foundation Pit.Firstly, lists the major deformation of deep foundation pit excavation process, analyzes the deformation mechanism and failure characteristics of the building envelope, and study the influencing factors of pit space-time effects, on a timely manner to avoid the foundation excavation hidden risks and proper development of the construction program plays a guiding role. Provides a theoretical basis for the numerical analysis of the papers.Then, based on Dalian Subway deep foundation construction process, the displacement related to deformation of retaining structure monitor, and research the deformation laws of retaining structure. In the entire process of excavation, the horizontal displacement of shoring and excavation depth is related. By comparing the amount of displacement of the foundation pit, the rate of deformation of the retaining structure is stabilized from steep to slow.Thirdly, apply the FLAC3D finite difference software to simulate the deep foundation pit excavation and support process. According to compare displacement values with numerical analysis results, summed up the deep foundation pit deformation law.Lastly, by studying the excavation deformation security prediction control methods, and determine the early warning value of deep excavation engineering.In a word, this article monitored the structural deformation which caused by the Dalian Subway deep excavation pit, combined with numerical simulation and field data validation analysis, studied on major structural deformation laws of deep excavation process, proposed deep station foundation security forecasting methods, in order to grasp the evolution trends of disasters that may occur in the course of construction, to provide a reference for disaster early warning.