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The Characteristics of Undrained Shear Strength for Normally Consolidated Decomposed Weathered Mudstone Soil  

김영수 (경북대학교 공과대학 토목공학과)
김기영 (경북대학교 공과대학 토목공학과)
문홍득 (진주산업대학교 토목공학과)
Publication Information
Journal of the Korean Geotechnical Society / v.18, no.5, 2002 , pp. 7-18 More about this Journal
Abstract
Generally, natural soils are affected by one-dimensional consolidation so that the behavior characteristic could be somewhat different from the isotropic consolidation specimen. But, due to experimental difficulties and the lack of equipment, the isotropic triaxial tests are mainly performed in most lab. tests. So it seems to be very effective if it is possible to predict pore water pressure and undrained shear strength in the $K_o$ state as the results of isotropic triaxial consolidation test. In this study, isotropic triaxial consolidation test and $K_o$ triaxial consolidation test were performed and we obtained parameters related to pore water pressure ratio using the Hyperbolic model. And then we predicted the behavior of pore water pressure that occurred in the $K_o$ state from the results obtained in the isotropic triaxial cosolidation test through the equation suggested by Lo(1969). It is possible to seize the validity of Lo(1969) equation. Also, considering undrained shear strength obtained from consolidation method in relation with water content, we find that consolidation method have an effect on undrained shear strength. Finally, using the Wroth(1984) equation that is based on the theory of critical state, undrained shear strength in the $K_o$ state was predicted from that of the isotropic triaxial consolidation test. The usefulness of the equation was verified by comparing the predicted value with experimental results.
Keywords
Critical-state; Hyperbolic model; Undrained shear strength; Weathered mudstone soil;
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Times Cited By KSCI : 1  (Citation Analysis)
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