The application of stress path and critical state analysis to sediment deformation |
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| Affiliation: | 1. Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, United States;2. Department of Geological Sciences, University of Delaware, Newark, DE 19716, United States;1. Institute of Oceanology, Polish Academy of Sciences, 81-712 Sopot, Poland;2. Natural History Museum, London, UK;1. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, Heilongjiang, China;2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China;3. Institute of Transportation, Inner Mongolia University, Hohhot 010070, China |
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| Abstract: | The importance of consolidation, compression and shear as deformation mechanisms in uncemented sediments is discussed and the critical state concept is introduced as a unifying model for these aspects of deformation. From the critical state and the law of effective stress, the concepts of burial and tectonic stress paths are introduced with reference to the development of growth faults in an unlithified sediment undergoing simultaneous burial and extension. It is demonstrated that particulate deformation mechanisms can be important at burial depths of several kilometres, especially if the sediment is overpressured, and that deformation of this type will influence the geometry and nature of the structures produced. A model for the geometry and spacing of growth faults developed in unlithified sediments is proposed utilizing stress path and critical state concepts. |
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