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Yielding evaluation of cement-treated soft clay under isotropic and anisotropic stress states using continuous Gmax measurements
https://orcid.org/http://orcid.org/0000-0003-3603-8097
Maximum shear modulus (Gmax) is increasingly used for quality control assessment of cement-treated clays in the laboratory. The addition of cement results in presence of structure in clays. Through continuous measurements of Gmax with varying stress state, a clearer contrast between the cementation-controlled zone and stress-controlled zone of stiffness becomes possible. The current study utilizes this concept in providing a fresh perspective in separating the pre-yield and post-yield zones of cement-treated clays. Initially, using a multiple yield point criterion, yield loci are established by conventional Consolidated Isotropic Drained (CID) testing on cement-treated kaolin clay specimens with a wide range of stiffness. Then, the stiffness evolution with stress state is characterized using a series of isotropic compression tests and CID tests with continuous Gmax measurements. The CID testing is performed with submersible LVDTs while monitoring the variation of Gmax with the stress state. To ensure that the specimen undergoes large plastic deformation beyond the yielding region, the bond yield ratio (BYR) was kept below 2. The results of this approach indicate that the Gmax of the specimens remains cementation-controlled up to much higher stresses beyond the initial yield point pIy′ implying that significant bond degradation does not occur within that region. In general, stiffness becomes stress-controlled beyond the mid-yield point pMy′ for both the isotropic and anisotropic stress states. Finally, the study is also crucial in highlighting the importance of Gmax measurements for better characterizing yielding in cement-treated clays.
Yielding evaluation of cement-treated soft clay under isotropic and anisotropic stress states using continuous Gmax measurements
https://orcid.org/http://orcid.org/0000-0003-3603-8097
Maximum shear modulus (Gmax) is increasingly used for quality control assessment of cement-treated clays in the laboratory. The addition of cement results in presence of structure in clays. Through continuous measurements of Gmax with varying stress state, a clearer contrast between the cementation-controlled zone and stress-controlled zone of stiffness becomes possible. The current study utilizes this concept in providing a fresh perspective in separating the pre-yield and post-yield zones of cement-treated clays. Initially, using a multiple yield point criterion, yield loci are established by conventional Consolidated Isotropic Drained (CID) testing on cement-treated kaolin clay specimens with a wide range of stiffness. Then, the stiffness evolution with stress state is characterized using a series of isotropic compression tests and CID tests with continuous Gmax measurements. The CID testing is performed with submersible LVDTs while monitoring the variation of Gmax with the stress state. To ensure that the specimen undergoes large plastic deformation beyond the yielding region, the bond yield ratio (BYR) was kept below 2. The results of this approach indicate that the Gmax of the specimens remains cementation-controlled up to much higher stresses beyond the initial yield point pIy′ implying that significant bond degradation does not occur within that region. In general, stiffness becomes stress-controlled beyond the mid-yield point pMy′ for both the isotropic and anisotropic stress states. Finally, the study is also crucial in highlighting the importance of Gmax measurements for better characterizing yielding in cement-treated clays.
Yielding evaluation of cement-treated soft clay under isotropic and anisotropic stress states using continuous Gmax measurements
https://orcid.org/http://orcid.org/0000-0003-3603-8097
Maximum shear modulus (Gmax) is increasingly used for quality control assessment of cement-treated clays in the laboratory. The addition of cement results in presence of structure in clays. Through continuous measurements of Gmax with varying stress state, a clearer contrast between the cementation-controlled zone and stress-controlled zone of stiffness becomes possible. The current study utilizes this concept in providing a fresh perspective in separating the pre-yield and post-yield zones of cement-treated clays. Initially, using a multiple yield point criterion, yield loci are established by conventional Consolidated Isotropic Drained (CID) testing on cement-treated kaolin clay specimens with a wide range of stiffness. Then, the stiffness evolution with stress state is characterized using a series of isotropic compression tests and CID tests with continuous Gmax measurements. The CID testing is performed with submersible LVDTs while monitoring the variation of Gmax with the stress state. To ensure that the specimen undergoes large plastic deformation beyond the yielding region, the bond yield ratio (BYR) was kept below 2. The results of this approach indicate that the Gmax of the specimens remains cementation-controlled up to much higher stresses beyond the initial yield point pIy′ implying that significant bond degradation does not occur within that region. In general, stiffness becomes stress-controlled beyond the mid-yield point pMy′ for both the isotropic and anisotropic stress states. Finally, the study is also crucial in highlighting the importance of Gmax measurements for better characterizing yielding in cement-treated clays.
Yielding evaluation of cement-treated soft clay under isotropic and anisotropic stress states using continuous Gmax measurements
Acta Geotech.
Khan, Qasim (author) / Ku, Taeseo (author)
Acta Geotechnica ; 19 ; 4255-4276
2024-07-01
22 pages
Article (Journal)
Electronic Resource
English
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