Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evolution of Shear-Zone Structure in Undrained Ring-Shear Tests
Abstract Undrained monotonic torque-controlled tests were conducted on fine-grained silica sand to study the shear-deformation process in granular materials by using a ring-shear apparatus. Shear-zone structures at various stages in the undrained shear tests were observed during a series of tests in which the experiments were terminated at different shear displacement. For “undisturbed” samples, the shear zone was only developed during the post-failure stage and its thickness increased with progressed shearing. First the shear surfaces had undulating and asymmetric structures; later they gradually became smooth and parallel to the shearing direction. During this process, pore water pressure was generated, and the effective friction angle decreased correspondingly. Generally, the shear zone could be divided into three parts: the compacted core, the adjacent zone above the core, and the adjacent zone below the core. Grain-size analysis on the sample from the shear zone revealed that grain crushing occurred during each stage and the extent of grain crushing differed for different shear stages. An interesting phenomenon occurred during the steady-state deformation where the coarse and fine particles within the shear zone segregated during motions and a parallel orientation structure developed. These results are helpful for understanding the mechanism of progressive failure in granular material as well as the rapid landslide with long runout study.
Evolution of Shear-Zone Structure in Undrained Ring-Shear Tests
Abstract Undrained monotonic torque-controlled tests were conducted on fine-grained silica sand to study the shear-deformation process in granular materials by using a ring-shear apparatus. Shear-zone structures at various stages in the undrained shear tests were observed during a series of tests in which the experiments were terminated at different shear displacement. For “undisturbed” samples, the shear zone was only developed during the post-failure stage and its thickness increased with progressed shearing. First the shear surfaces had undulating and asymmetric structures; later they gradually became smooth and parallel to the shearing direction. During this process, pore water pressure was generated, and the effective friction angle decreased correspondingly. Generally, the shear zone could be divided into three parts: the compacted core, the adjacent zone above the core, and the adjacent zone below the core. Grain-size analysis on the sample from the shear zone revealed that grain crushing occurred during each stage and the extent of grain crushing differed for different shear stages. An interesting phenomenon occurred during the steady-state deformation where the coarse and fine particles within the shear zone segregated during motions and a parallel orientation structure developed. These results are helpful for understanding the mechanism of progressive failure in granular material as well as the rapid landslide with long runout study.
Evolution of Shear-Zone Structure in Undrained Ring-Shear Tests
Wafid Agung, Muhammad (Autor:in) / Sassa, Kyoji (Autor:in) / Fukuoka, Hiroshi (Autor:in) / Wang, Gonghui (Autor:in)
Landslides ; 1 ; 101-112
13.05.2004
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Undrained cyclic shear response evaluation of sand based on undrained monotonic ring shear tests
| British Library Online Contents | 2004
Undrained Shear Behavior of Silty Soils in Ring-Shear Tests
| British Library Conference Proceedings | 2000
Undrained shear strength for natural clay deposits by shear tests
| British Library Conference Proceedings | 2002
Evolution of excess pore water pressure in undrained clay-structure interface shear tests
| BASE | 2024