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http://dx.doi.org/10.7843/kgs.2006.22.7.5

Comparison of Shallow Model Tunnel Test Using Image Processing and Numerical Analysis  

Lee, Yong-Joo (Steel Structure Research Laboratory, Research Institute of Industrial Science & Technology (RIST))
Publication Information
Journal of the Korean Geotechnical Society / v.22, no.7, 2006 , pp. 5-12 More about this Journal
Abstract
In this study, 2D shallow tunnel model test using close range photogrammetric technique was conducted with aluminium rods simulating continuum granular material. Numerical analysis was also carried out in order to identify the behaviour of subsurface deformations caused by shallow tunnelling. Direction and magnitude of displacement vectors from the model test were identical to the result of numerical analysis based on the model data. In particular, it is shown that the vector direction was toward a point below the tunnel invert level. A narrow "chimney or tulip like" pattern of vertical displacement was confirmed by both the model test and numerical analysis. This behaviour is consistent with the field data. In addition to the qualitative comparison, the quantitative result of subsurface settlements according to 2D volume loss showed good agreement between the model test and numerical analysis. Therefore, close range photogrammetric technique applied in the model test may be used to validate the result from the continuum numerical analysis.
Keywords
Aluminium rods; Close range photogrammetric technique; Continuum granular material; Numerical analysis; Shallow tunnel; Subsurface deformation;
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