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Back Analysis of the Earth Wall in Multi-layered Subgrade  

이승훈 (연세대학교 공과대학 토목공학과*)
김종민 (세종대학교 공과대학 토목공학과)
김수일 (연세대학교 공과대학 토목공학과)
장범수 (시설안전기술공단 기술개발지원실)
Publication Information
Journal of the Korean Geotechnical Society / v.18, no.1, 2002 , pp. 71-78 More about this Journal
Abstract
This paper presents a back-calculation technique leer the prediction of the behavior of earth wall inserted in multi-layered soil deposit. The soil properties are back-calculated from the measured displacement at each construction stage and the behavior of earth wall far the next construction stage is predicted using back-calculated soil properties. For multi-layered soil deposit, the back-calculation would be very difficult due to the increase in the number of variables. In this study, to solve this difficulty, the back-calculation was performed successively from the lowest layer to the upper layers. An efficient elasto-plastic beam-column analysis was used for forward analysis to minimize the computation time of iterative back-calculation procedure. The coefficients of subgrade reaction and lateral earth pressure necessary for the formation of p-y curve were selected as back calculation variables, and to minimize the effect of abnormal behavior of the wall which might be caused by any unexpected action during construction, the difference between measured displacement increment and computed displacement increment at each construction stages is used as the objective function of optimization. The constrained sequential linear programming was used for the optimization technique to found values of variables minimizing the objective function. The proposed method in this study was verified using numerically generated data and measured field data.
Keywords
Back analysis; Beam-column analysis; Earth wall; Multi-layered subgrade; Optimization;
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