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http://dx.doi.org/10.7843/kgs.2007.23.10.163

Behavior of Tunnel Due to Adjacent Ground Excavation with Pre-loading on Braced Wall  

Kim, Il (Dept. of Environmental Construction and Transportation Engrg., Ajou Univ.)
Lee, Sang-Duk (Dept. of Environmental Construction and Transportation Engrg., Ajou Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.10, 2007 , pp. 163-174 More about this Journal
Abstract
A New pre-loading system, through which a large pre-load could be charged was developed and applied to the braced wall in order to stabilize the adjacent tunnel. A pre-load larger than the designated axial force of bracing was imposed to prevent the horizontal displacement of the braced wall during the ground excavation. For this purpose, real scale model tests (1/10) were conducted, without and with pre-load on braced wall. And numerical analyses were performed for both the cases without and with pre-load, which were half (50%) and full (100%) respectively, and larger scale of the design axial farce of bracing. FEM program called PLAXIS was used for numerical analysis. As a result, it was found that the stability of the existing tunnel adjacent to the braced wall could be greatly enhanced when the horizontal displacement of braced wall was reduced by applying a pre-load, which was larger than the designated axial force of bracing.
Keywords
Braced wall; Design axial force on bracing; Ground excavation; Large scale model test; Pre-loading;
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