| Summary: | 博士 === 國立成功大學 === 土木工程學系碩博士班 === 95 === This paper is to investigate the interaction of retaining wall and horizontal surface backfill which gets into active condition (or passive condition) and reaches to active state (or passive state). The associated flow rule is assumed for the backfill considered as an elastic-plastic material which is corresponded with fully drained plane strain. The Mohr-Coulomb failure criterion is adopted as the yield function in the meantime. The commercial finite element method, ABAQUS, is applied in this work. A surface-based contact approach between retaining wall and backfill simulates the interaction of them with four different wall angles. The wall is simulated to move away from the backfill for active process. Contrarily, the wall is simulated to move toward the backfill for passive process. The influence of lateral earth pressure coefficients, lateral earth pressure’s distribution, acting point of the total pressure and its turning moment is studied. Furthermore, the displacement is observed easily in practice, and the maximum plastic strain, a very important parameter characterizing the plastic state of soil body, was seldom mentioned in previous references. Accordingly, the study based on the contours of displacement and maximum plastic strain analyzes the positions and characteristics of deformed profile which is compared with the slip failure surface calculated by traditional Coulomb’s theory. Two simple parameters, and , which can be used to calculate the potential failure sites are obtained by combining plotting the contour of displacement and the maximum plastic strain of backfill and Coulomb’s theory with different wall friction. For active condition, the potential failure sites by this research are closer to retaining wall than that analyzed by Coulomb’s theory. On the contrary, they are farther to retaining wall than those analyzed by Coulomb’s theory for passive condition. It is suggested that and would be modified by more experimental data, then the parameters can be used as consultation for construction, design and safe monitoring of retaining wall and backfill.
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