Abstract
This study evaluated the structural stability of subway structures based on adjacent excavations by comparing automatically measured and numerically analyzed data. The reliability of the automated measurement methodology was evaluated by first applying probability statistical analysis to the measured results and then comparing these results with the numerically analyzed results. An improvement in the calculation method evaluation system, including the method of processing and analysis of the automatically measured data of subway structures through the average value of probability density, was proposed. As a result of the field measurement and numerical analysis, the measured results of tunnel displacement and track deformation exhibited some differences. However, it was determined that the construction stage and location where the maximum values of the tunnel displacement and track deformation occurred had similarities.
Highlights
With the increasing urban population and the consequent increase in demand for high-rise buildings, large-scale excavation works at greater depths have increased in areas adjacent to existing subway structures
Due to the recent increase in urban development, this study analyzed the effect of excavation work adjacent to existing subway structures using numerical analysis and field measurements
The results were compared with the results of the numerical analysis, and the key findings are summarized as follows: (1) The numerical analysis of the deformation of subway structures showed that the increase in the vertical displacement of the tunnel generated in the removal stage of the existing structure was similar to that of the excavation stage, and the increased value returned to the initial value in the backfill stage
Summary
With the increasing urban population and the consequent increase in demand for high-rise buildings, large-scale excavation works at greater depths have increased in areas adjacent to existing subway structures. Safety evaluation of subway structures and tracks with adjacent excavation is mostly performed with respect to geotechnical aspects, and there have been limited studies on accurate measurement and analysis methods for the measured data. To analyze the behavior of subway structures with respect to adjacent excavation constructions, the automatically measured results obtained with probability statistical analysis were compared in this study with numerically analyzed results. As shown in Fi. 5h, RM-36, a sensor installed adjacent to the excavation section, showed the most sig cant increase in displacement, and its value was larger than the measurement result o tunnel convergence meter (TL-10). Analysis of Tunnel Convergence Measurement Results In this study, as shown, the displacement responses over time measured by automated measurements were analyzed by the removal stage.
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