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.

October 2020
October 2020

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.

June 2020
June 2020

Conference Paper

Published a Conference Paper at 54th US Rock Mechanics/Geomechanics Symposium, June 28 - July 1, 2020 titled "Simulating the excavation damaged zone of a supported deep geological repository using FDEM"
June 2018
June 2018

Conference Paper

Published a Conference Paper at 10th Asian Rock Mechanics Symposium, October 29 – November 3, 2018 titled "FDEM tunnel excavation modelling in layered rock"

 
June 2018
June 2018

Conference Paper

Published a Conference Paper at 52nd US Rock Mechanics/Geomechanics Symposium, June 17 – 20, 2018 titled "Three-dimensional FDEM modelling of laboratory tests and tunnels"
December 2017
December 2017

Research Position

Started as a Research Associate with Grasselli's Geomechanics Group

June 2017
June 2017

MASc Graduate

Graduated with MASc with thesis titled "FDEM tunnel modelling in Georgian Bay shale"
April 2017
April 2017

Research Position

Started as a Casual Researcher with Grasselli's Geomechanics Group

October 2016
October 2016

Conference Paper

Published a Conference Paper at Tunnelling Association of Canada 2016 Ottawa, October 16 – 18, 2016 titled "Simulating tunnel behaviour in interbedded shale and limestone using FDEM"
September 2016
September 2016

Award

Received the Queen Elizabeth II/Robert M. Smith Memorial Graduate Scholarship

September 2016
September 2016

Internship

Ontario’s TalentEdge Internship Program titled in partnership with Geomechanica Inc.

September 2015
September 2015

Award

Received the Queen Elizabeth II/Robert M. Smith Memorial Graduate Scholarship

August 2015
August 2015

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.

July 2015
July 2015

Award

Received the KEGS Foundation Scholarship
July 2015
July 2015

Conference Paper

Published a Conference Paper at 49th US Rock Mechanics/Geomechanics Symposium, June 28 – July 1, 2015 titled "FDEM modelling of thermo-mechanical wellbore instabilities within shale formations"
May 2015
May 2015

Conference Paper

Published a Conference Paper at Geoconvention 2015, May 4 - 8 titled "FDEM modelling of thermal wellbore instabilities within shale formations"
September 2014
September 2014

Award

Received the Queen Elizabeth II/Robert M. Smith Memorial Graduate Scholarship

September 2014
September 2014

Joined

Joined as a MASc Candidate

Publications

Ha, J., Tatone, B. S. A., Gaspari, G. M., & Grasselli, G. (2021). Simulating tunnel support integrity using FEM and FDEM based on laboratory test data. Tunnelling and Underground Space Technology, 111, 103848. https://doi.org/10.1016/j.tust.2021.103848
Magsipoc, E., Li, M., Abdelaziz, A., Ha, J., Peterson, K., & Grasselli, G. (2020). Analysis of the Fracture Morphologies from a Laboratory Hydraulic Fracture Experiment on Montney Shale. 6.
Li, M., Magsipoc, E., Abdelaziz, A., Ha, J., Guo, J., Peterson, K., & Grasselli, G. (2020). Mapping Fracture Complexity in Hydraulically Fractured Montney Shale by Serial Section Reconstruction. 9.
Ha, J., & Grasselli, G. (2020). Simulating the Excavation Damaged Zone of A Supported Deep Geological Repository Using FDEM. 6.
Fadakar, Y. A., Ha, J., & Grasselli, G. (2020, June 28). Smash - Smart Meshing for realistic geomechanical models of rock slope failure processes. 54th U.S. Rock Mechanics / Geomechanics Symposium, Golden, Colorado.
Abdelaziz, A., Ha, J., & Grasselli, G. (2020, March 2). Excavation stability in heterogeneous anisotropic shale formation. 36th International Geological Congress, Delhi, India.
Abdelaziz, A., Ha, J., Abul Khair, H., Adams, M., Tan, C. P., Musa, I. H., & Grasselli, G. (2019). Unconventional Shale Hydraulic Fracturing Under True Triaxial Laboratory Conditions, the Value of Understanding Your Reservoir. 16. https://doi.org/10.2118/196026-MS
Ha, J. (2019). Three-dimensional hydraulic fracture simulation. Energi Simulation Visit, University of Toronto.
Ha, J., & Grasselli, G. (2018, November 29). FDEM Tunnel Excavation Modelling in Layered Rock. 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. https://doi.org/10.1016/j.tust.2018.06.022
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. https://doi.org/10.1016/j.dib.2018.08.151
Ha, J., & Grasselli, G. (2018). Three-dimensional FDEM modelling of laboratory tests and tunnels. 52nd U.S. Rock Mechanics/Geomechanics Symposium, Seattle.
Ha, J. (2017). FDEM Tunnel Modelling in Georgian Bay Shale [MASc Thesis, University of Toronto].
Qiu, Y., Ha, J., Peterson, K., & Grasselli, G. (2017). Finite-Discrete Element Modeling of Time-Dependent Mechanisms in Southern Ontario Shales. GeoOttawa 2017 - 70th Canadian Geotechnical Conference, Ottawa.
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, 3, 1762–1769. Scopus.