Abstract
With the development of urban underground space in China, foundation pits have followed a trend toward larger area and greater depth. To ensure the safe excavation of foundation pits, it is necessary to monitor their deformation and the internal force of supporting structures and then use assessments of pit and building stability to guide construction. This paper introduces the design and development of a safety monitoring and warning system for deep foundation pits and adjacent buildings. The monitoring information management system uses Visual Studio 2013 as its development platform and adopts the SQL and C# programming languages to realize its powerful data management and visualization functions. By combined consideration of the monitoring information and the layout of the measuring points, monitoring data on the deformation of the deep foundation pit, ground subsidence and deformation of adjacent buildings are analyzed comprehensively. The results show that: first, the horizontal deformation of the side wall of the rock foundation pit achieves its peak value when 50% of the excavation has been completed and tends to change steadily after the completion of anchor construction. Second, the ground surface around the Fengjing area exhibits upward vertical deformation closest to the side wall of the foundation pit, and then downward deformation at greater distances from it. The ground surface relatively far from the side wall exhibits settlement. Third, the internal force of a plate-ribbed anchor retaining wall in the Fengjing area becomes greater at greater depths. Finally, the excavation of a rock foundation pit has relatively little influence on the inclination of adjacent buildings.
Highlights
The area and depth of foundation pits have been increasing in recent years in parallel with the intensification of development
A deep foundation pit is taken as the research background, and the research and development of a deep foundation pit monitoring system are further studied from the aspects of monitoring layout, data acquisition, management, processing, analysis, prediction, and warning
A monitoring information management system adopting Visual Studio 2013 (VS2013) as the development platform and based on.NET as its interface program between the software and database, Excel, Word and Acrobat is designed to facilitate the management of monitoring data from the deep foundation pit
Summary
The area and depth of foundation pits have been increasing in recent years in parallel with the intensification of development. (2) Most systems can calculate and analyze monitoring data from a foundation pit but only display the results of this analysis in the form of words or tables; the visualization component of such systems needs to be strengthened and, incorporate three-dimensional visualization of engineering information. These deficiencies are addressed in the current study. A deep foundation pit is taken as the research background, and the research and development of a deep foundation pit monitoring system are further studied from the aspects of monitoring layout, data acquisition, management, processing, analysis, prediction, and warning. The horizontal displacement of the side wall, surface deformation around the foundation pit, and the internal force of a plate-ribbed anchor retaining wall are analyzed according to data collected from the Fengjing area, and the influence of excavation on the adjacent buildings is estimated
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