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Title:Integrated computational-experimental soil behavior characterization from direct simple shear tests on Boston Blue Clay
Author(s):Moon, Sungwoo
Director of Research:Hashash, Youssef M.
Doctoral Committee Chair(s):Hashash, Youssef M.
Doctoral Committee Member(s):Mesri, Gholamreza; Olson, Scott M.; Ghaboussi, Jamshid
Department / Program:Civil & Environmental Eng
Discipline:Civil Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):inverse analysis
direct simple shear
constitutive models
soil behavior
excavation
Abstract:A constitutive model that represents soil behavior under a wide range of loading conditions is necessary for the simulation of complex boundary value problems. However, most laboratory tests are interpreted with an assumption of uniform stresses and strains within the tested soil specimen even when the specimen is known to experience non-uniform stress-strain distribution as in the Direct Simple Shear (DSS) test. Numerous tests are often needed to fully characterize a soil’s nonlinear and anisotropic and time-dependent behavior and to develop an appropriate soil model. This study utilizes an evolutionary inverse analysis approach to directly extract non-uniform stresses and strains within an undrained DSS test specimen, and which is subsequently to K0 consolidated-undrained direct simple shear (CK0UDSS) tests on Boston Blue Clay (BBC). The extracted soil behavior is consistent with known behavior of BBC including anisotropic stress-strain response and small strain nonlinearity obtained under complex laboratory loading conditions. The developed material models from DSS tests on Boston Blue Clay (BBC) are directly applied to deep excavation case histories. The analysis results show that the global responses, such as lateral wall deflections and vertical ground surface settlements, can be successfully reproduced. The proposed approach represents a major shift in our ability to efficiently bridge numerical modeling and laboratory testing and change the way we approach soil characterization and constitutive model development. We can use very few laboratory tests to directly develop versatile material models that can be used in the solution of geotechnical field problems without the need for complex formulations or long development periods or calibration process. This is something that we have been unable to do before.
Issue Date:2014-05-30
URI:http://hdl.handle.net/2142/49670
Rights Information:Copyright 2014 Sungwoo Moon
Date Available in IDEALS:2014-05-30
2016-09-22
Date Deposited:2014-05


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