Compressibility and Shear Strength of Weakly Cemented Clay |
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학술지명 International Journal of Geo-Engineering
저자 박동순
발표일 2013-12-01
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Artificial sensitive clay can be prepared in the laboratory for physical modeling and one of the recipes is to using a small amount of cement (2 to 5%) with controlled initial water content and hardening period. Use of artificially cemented clay requires the knowledge regarding its compressibility and shear strength. In this paper characteristics of compressibility and strength loss of weakly cemented clays are investigated for both artificially cemented high plasticity San Francisco Bay Mud and low plasticity Yolo Loam. Destructuration and softening behavior for weakly cemented sensitive clays are demonstrated and discussed through multiple series of incremental (ICL) and constant rate of (CRS) consolidation tests, unconfined uniaxial compression tests (UC), and monotonic, cyclic, postcyclic monotonic direct simple shear (DSS) tests. As a result, the post-peak strain softening and cyclic strength loss is proven to be remarkable for weakly cement treated clays. The results would be beneficial to study of physical modeling for sensitive clays in that artificially cemented clay can be successfully constructed in a reproductive manner with satisfying desired shear strength and sensitivity. Test data is also contributable to provide references for constitutive modelers in pursuit of structured clay simulation. |