I am a Postdoctoral Research Scientist in the Civil Engineering and Engineering Mechanics Department at Columbia University, where I work with Prof. Steve WaiChing Sun. I earned my Ph.D. from Stanford University in Civil and Environmental Engineering with a minor in Mechanical Engineering, under the supervision of Prof. Ronaldo I. Borja. Prior to Stanford, I worked for three years at the Korea Institute of Civil Engineering and Building Technology, and before that, I received my B.S. and M.S. degrees from the Seoul National University. My work has been generously supported by several sponsors including the Fulbright Program.
My research seeks to better understand and predict how geomechanical systems respond to engineering and natural processes such as construction, hazards, and energy production. I develop and apply theoretical, numerical, and experimental methods to achieve three interconnected goals: (1) to decipher and model the fundamental behavior of geological materials; (2) to facilitate applications of advanced computational methods to large-scale geomechanical problems; and (3) to bridge the gap between the real-world dynamics of subsurface systems and their engineering predictions. Through my research I want to help today's engineers make our built environment more sustainable and resilient.
Feb 16, 2017: My paper on multiscale computational modeling of poromechanics, in collaboration with Prof. Steve WaiChing Sun, has been published in International Journal for Numerical Methods in Engineering.
Reaction-driven cracking during crystallization in pores: A mathematical framework for coupled chemo-poro-mechanics and phase-field modeling.
J. Choo and W.C. Sun. Working paper.
Coupled phase-field fracture and plasticity modeling of geological materials: A single framework for brittle fracture, ductile flow, and brittle-ductile transition.
J. Choo and W.C. Sun. Working paper.
Mixed Arlequin method for multiscale poromechanics problems.
W.C. Sun, Z. Cai, and J. Choo. International Journal for Numerical Methods in Engineering, In press.
Cam-Clay plasticity, Part VIII: A constitutive framework for porous materials with evolving internal structure.
R.I. Borja and J. Choo. Computer Methods in Applied Mechanics and Engineering, 309:653–679, 2016.
Hydromechanical modeling of unsaturated flow in double porosity media.
J. Choo, J.A. White, and R.I. Borja. International Journal of Geomechanics, D4016002, 2016.
Stabilized mixed finite elements for deformable porous media with double porosity.
J. Choo and R.I. Borja. Computer Methods in Applied Mechanics and Engineering, 293:131–154, 2015.
Numerical investigation of the at-rest earth pressure coefficient of granular materials.
T.S. Yun, J. Lee, J. Lee, and J. Choo. Granular Matter, 17(4):413–418, 2015.
Effect of pre-shear stress path on nonlinear shear stiffness degradation of cohesive soils.
J. Choo, Y-H. Jung, W. Cho, and C-K. Chung. Geotechnical Testing Journal, 36(2): 198–205, 2013.
Evolution of pore characteristics in the 3D numerical direct shear test.
D.H. Kang, J. Choo, and T.S. Yun. Computers and Geotechnics, 49:53–61, 2013.
Stress-induced evolution of anisotropic thermal conductivity of dry granular materials.
J. Choo, Y.J. Kim, J.H. Lee, T.S. Yun, J. Lee, and Y.S. Kim. Acta Geotechnica, 8(1):91–106, 2013.
Patterns of nonlinear shear stiffness degradation of reconstituted clay with different stress histories.
Y-H. Jung, J. Choo, W. Cho, and C-K. Chung. Marine Georesources and Geotechnology, 31(4):309–331, 2013.
Quantifying the distribution of paste-void spacing of hardened cement paste using X-ray computed tomography.
T.S. Yun, K.Y. Kim, J. Choo, and D.H. Kang. Materials Characterization, 73:137–143, 2012.
Determination of air-void parameters of hardened cement-based materials using X-ray computed tomography.
K.Y. Kim., T.S. Yun, J. Choo, D.H. Kang, and H.S. Shin. Construction and Building Materials, 37:93–101, 2012.
Effect of directional stress history on anisotropy of initial stiffness of cohesive soils measured by bender element tests.
J. Choo, Y-H. Jung, and C-K. Chung. Soils and Foundations, 51(4):737–747, 2011.
Rock moisture dynamics, preferential flow, and the stability of hillside slopes.
R.I. Borja, J. Choo, and J. A. White. Chap. 20 in Multi-hazard Approaches to Civil Infrastructure Engineering, P. Gardoni and J. M. LaFave (Eds.), Springer, 443–464, 2016.
Hydromechanical modeling framework for multiscale porous materials.
J. Choo, Ph.D. Dissertation, Department of Civil and Environmental Engineering, Stanford University, 2016.
Effect of stress history on the small-strain behavior of clay.
J. Choo, M.S. Thesis, Department of Civil and Environmental Engineering, Seoul National University, 2009.