Johnson Ha
Research Associate
Biography
Johnson has been a research associate with Professor Grasselli’s research group since December 2017. He finished his BASc and MASc in Civil and Mineral Engineering at the University of Toronto in 2014 and 2017, respectively. His research interests include calibrating rock mechanics testing results to numerical models, simulating hydraulic fracturing processes, and simulating tunnel behaviour in highly anisotropic rock. Aside from rock mechanics research, he enjoys cooking, playing competitive volleyball, and video games.
Invited Talk
Invited talk on "Experimental Testing Under In Situ Stress Conditions and the Importance of Standards to Determine What Dictates the Resultant Geometry of Rock Failure: Fracture Propagation vs. Rock Structure/Fabric?
" as part of the Geological Controls and Fracture Mechanics - Considerations for the Geological Storage of Carbon Dioxide, Hydrogen, Methane and Compressed Air."
Conference Paper
Invited talk on "Hydraulic fracturing in shale - the importance of anisotropy and geological structure" given as part of Earth Seminar Invited Guest Seminar series.
Research Position
Started as a Research Associate with Grasselli's Geomechanics Group
Research Position
Started as a Casual Researcher with Grasselli's Geomechanics Group
Award
Received the Queen Elizabeth II/Robert M. Smith Memorial Graduate Scholarship
Internship
Ontario’s TalentEdge Internship Program titled in partnership with Geomechanica Inc.
Award
Received the Queen Elizabeth II/Robert M. Smith Memorial Graduate Scholarship
Internship
Mitacs Accelerate program titled "Innovative design of a sound numerical model calibration process: from lab tests to input data" in partnership with Geomechanica Inc.
Award
Received the Queen Elizabeth II/Robert M. Smith Memorial Graduate Scholarship
Joined
Joined as a MASc Candidate
Publications
6575102
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Ha, J., & Grasselli, G. (2018). FDEM Tunnel Excavation Modelling in Layered Rock. Presented at the 10th Asian Rock Mechanics Symposium The ISRM International Symposium for 2018 (ARMS10), Singapore.
He, T.-M., Zhao, Q., Ha, J., Xia, K., & Grasselli, G. (2018). Understanding progressive rock failure and associated seismicity using ultrasonic tomography and numerical simulation. Tunnelling and Underground Space Technology, 81, 26–34.
Ha, J., Abdelaziz, A., & Grasselli, G. (2018). Hydraulic Fracturing under True Triaxial Conditions.
Zhao, Q., He, T. M., Ha, J., Xia, K., & Grasselli, G. (2018). Dataset for time-lapse ultrasonic tomography of a granite slab under uniaxial compression test. Data Brief, 20, 614–616.
Ha, J., & Grasselli, G. (2018). Three-dimensional FDEM modelling of laboratory tests and tunnels. Presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, Seattle: American Rock Mechanics Association (ARMA).
Qiu, Y., Ha, J., Peterson, K., & Grasselli, G. (2017). Finite-Discrete Element Modeling of Time-Dependent Mechanisms in Southern Ontario Shales. Presented at the GeoOttawa 2017 - 70th Canadian Geotechnical Conference, Ottawa.
Ha, J. (2017). FDEM Tunnel Modelling in Georgian Bay Shale (MASc Thesis). University of Toronto.
Ha, J., Lisjak, A., & Grasselli, G. (2015). FDEM modelling of thermo-mechanical wellbore instabilities within shale formations. 49th U.S. Rock Mechanics / Geomechanics Symposium 2015 (Vol. 3, pp. 1762–1769). Presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, San Francisco, California: American Rock Mechanics Association (ARMA).Scopus.
Ha, J., Lisjak, A., & Grasselli, G. (2015). FDEM Modelling of Thermal Wellbore Instabilities within Shale Formations. Presented at the Geoconvention 2015, Calgary.