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Evaluation of Surcharge toads Acting in Backfilled Space  

Moon Chang-Yeul (Dept. Civil Engrg., Samcheok Univ.)
Kim Hee-Dong (Dept. Civil Engrg., Samcheok Univ.)
Choi Heon (Dept. Civil Engrg., Samcheok Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.20, no.9, 2004 , pp. 167-176 More about this Journal
Abstract
Underground structures will be affected by the additional surcharge loads such as traffic load et al. Terzaghi (1956) suggested the equation on the influences of surcharge loads in vertically backfilled spaces. In field, the shapes of backfill spaces are not always formed vertically. Then the Terzagi (1956) equation is not suitable to use because of boundary condition. This study suggests equation to calculate the stress in backfilled space caused by surcharge loads when the backfilled space is sloped symmetrically. The suggested equation is verified by carbon box test and numerical analysis. The experimental results show good agreement with the suggested equation but the numerical analysis result shows a little disagreement. The differences are estimated to be caused by the fact that ground made by carbon rod has become more dense and internal frction and wall friction has increased itself as surcharge load is added but that this increase can not be considered in the numerical analysis. The suggested equation shows good agreement with Terzaghi (1956) equation in case of sloped backfill ground. According to the results, it is considered that the suggested equation can be applied not only to sloped space but also to vertical space. Further investigation using full scale experiment is needed.
Keywords
Surcharge Load; Backfilled Space; Numerical Analysis; Carbon Rod; Horizontal Stress;
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