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Computational Multiphysics Approaches to Geotechnical and Geoenvironmental Problems
 
Prof Jinhyun Choo
Assistant Professor of Civil Engineering at the University of Hong Kong (HKU)
Date: 22 December 2017, Friday
Time: 10:00 am - 11:00 am
Venue: Room 3574 (lift 27 & 28), Civil Engineering Departmental Conference Room, Academic Building, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon
Abstract
Many problems in subsurface systems are triggered by coupled multiphysical processes—that is, tight interactions among solid deformation, fluid flow/transport, chemical reactions, and other phenomena in geological materials. Examples include rainfall-induced landslides, long-term consolidation settlement, and hydraulic fracturing. Accurate prediction and management of these problems are beyond the capabilities of traditional approaches because they rely on empirical methods oversimplifying these intricately coupled physics.
This talk will introduce some recent approaches to subsurface engineering problems that rely on high-fidelity modeling and simulation of the relevant multiphysics processes. The talk will consist of two parts. The first part will focus on coupled fluid flow and solid deformation in naturally structured soils. Theoretical, constitutive, and computational modeling frameworks that honor the multiscale internal structure of these soils will be presented. The developed framework will then be used to gain insights into the physical origin of secondary compression (creep) and the impact of preferential flow on landslide triggering. In the second part, the focus will be shifted to the failure behavior of geomaterials under a variety of loading conditions. A coupled phase-field fracture–plasticity framework will be described as a way to capture a wide array of failure modes of geological materials from brittle fracture to ductile compaction. This framework will then be combined with multiphysics modeling to simulate cracking and damage from environmental loads.
 
 
Biography
Jinhyun Choo is Assistant Professor of Civil Engineering at the University of Hong Kong (HKU). He specializes in geomechanics and geotechnical engineering, and their intersections with computational solid mechanics and flow in porous media. His work addresses subsurface-related problems in the areas of civil infrastructure, energy resources, and environmental sustainability. He obtained his Ph.D. from Stanford University, in Civil and Environmental Engineering (Geomechanics) with a minor in Mechanical Engineering. He then completed his postdoctoral training at Columbia University before joining the HKU faculty. In earlier days, he received B.S. and M.S. degrees from the Seoul National University in Korea, and worked for three years at the Korea Institute of Civil Engineering and Building Technology. He is the recipient of multiple prestigious awards, including a Fulbright Scholarship for his doctoral studies in the United States, and a Charles H. Leavell Fellowship from Stanford University for research on sustainable built environment.
 
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