Displacement Monitoring Of Deep Foundation Pit Envelop Enclosure And Information Management System

With the rapid development of urbanization, the high building is increasing very fast, and the excavated depth and area is much deeper and bigger than before. The 15～20m deep foundation pit becomes normal. The depth for some deep foundation pits is more than 30. So the effect or damage to the surroundings becomes more prominent. In order to control the effect or damage, the deformation monitoring is very important. The deformation monitoring methods, data processing and management system for envelop enclosure of deep foundation pit are anayzed and discussed in this thesis. The main missions and concludes are as follows:Firstly, the monitoring plan to envelop enclosure of deep foundation pit is discussed, including monitoring content, setting of monitoring points, frequency of monitoring, warning values and alarming values and determination of deformation precision. Small angle method and polar coordinating method are discussed, which are usually used to monitoring the top displacement of deep foundation pit envelop enclosure, their characteristics and application are analyzed. Whereas applied limitations for small angle method, the application scope of small angle method is extended.Secondly, several normal forecast models of deformation monitoring are analyzed, their advantages, disadvantages and use scope are summarized, the deformation forecast model is established by using polynomial regression model. Fitting monitoring time and total displacement relation curves, and based on the measured data, the top displacement of deep foundation pit envelop enclosure is forecasted.Finally, due to large amount of data, management and inquiry difficult, data showing non-intuitive of deformation monitoring of deep foundation pit, the deep foundation excavation monitor information management system (PIMS) is developed and compiled by using VB language and the corresponding software. The system has some functions, such as deep foundation excavation monitor data management, data query, graphics generation, forecast analysis and report generation. It can carry out the automation of monitoring information and visualization of management. It can extract information from a large number of data quickly, and can be the basis for adjustment of construction and optimization of construction of foundation pit engineering. By monitoring data of deep foundation pit, the functions and features of the system are showed.The deep pit supporting structure displacement monitoring method, data processing and the deep foundation pit deformation information management system discussed in this paper, can play certain guidance and help role for engineering.