Ezra Tjung

Ezra Y. S. Tjung, Ph.D.

Engineer
Civil Engineering
Oakland
  • CV (English)
  • Contact Card

Dr. Tjung specializes in soil mechanics, geotechnical engineering, foundation engineering, earthquake engineering, and computational geomechanics. He has experience on both domestic and international projects including design of new high-rise structures, deep excavations, slope stabilization, retaining walls, failure analysis of dams, and retrofitting of existing structures. In his projects, Dr. Tjung has incorporated advanced numerical modeling through powerful tools that allowed to accurately analyze complex geotechnical problems. Additionally, he also has experience in data analysis and sustainable design.

Dr. Tjung’s experience includes planning and management of geotechnical ground investigations, and design of engineering systems, including deep excavation support, slope stabilization measures, structural foundations, and retaining walls. He has extensive experience performing foundation assessments, evaluation of dams and levees, planning and management of monitoring data, liquefaction assessment, conservation of historic structures, and liaising with office staff, contractors on site, and project management.

Dr. Tjung’s has extensive experience modeling large deformation problems in geomechanics using the Material Point Method. With this method, he successfully simulated sand production behavior in an oil rig, 2D and 3D flow of dry sand in laboratory flume experiment, and 3D historical debris flow. Dr. Tjung also initiated the use of the Material Point Method for earthquake applications including a back-analysis study of a liquefaction-induced dam failure. He has in-depth knowledge and experienced with advanced constitutive models based on the critical state understanding for cohesive and dilative behavior of rocks.

At the University of California, Berkeley, Dr. Tjung served as a Graduate Student Researcher (or Research Assistant) and was the Graduate Student Instructor (or Teaching Assistant) for six graduate and undergraduate courses in soil mechanics, geotechnical earthquake engineering, geotechnical ground investigation and laboratory testing, numerical modeling in geotechnical engineering, and numerical analysis. He also held positions in the Graduate Assembly as a delegate of the Civil and Environmental Engineering Department and was one of the founding members of the GeoEngineering Graduate Student Association at U.C. Berkeley, where he organized the Geotechnical Engineering Annual Research Symposium for the university.

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Civil and Environmental Engineering, University of California, Berkeley, 2020
  • M.S., Civil and Environmental Engineering, University of California, Berkeley, 2016
  • B.Eng., Civil and Environmental Engineering, Hong Kong University of Science and Technology (HKUST), 2014
  • Jane Lewis Fellowship, University of California, Berkeley, 2016-2018

    Civil and Environmental Engineering Outstanding GSI Award, University of California, Berkeley, 2018

    Outstanding Graduate Student Instructor Award, University of California, Berkeley, 2018

    Tor L. Brekke Award, University of California, Berkeley, 2016

    Harry Bolton Seed Memorial Fellowship, University of California, Berkeley, 2015

    AECOM Prize for Best Students of the Year 2014

    HKUST Academic Achievement Medal (Summa Cum Laude), HKUST, 2014

    HKUST President’s Cup – Gold Award, 2014

    Lo Bo Wing Memorial Exchange Scholarship, HKUST, 2013

    HKSAR Reaching Out Activities Scholarship, HKUST, 2013

    HKSAR Government Scholarship, HKUST, 2012

    Hong Kong Institute of Engineers (HKIE) Scholarship, HKUST, 2012

    University Scholarship, HKUST, 2011

LICENSES & CERTIFICATIONS

Licensed Professional Engineer, California, #C89298

Accredited Professional of Leadership in Energy and Environmental Design in Building Construction and Design (LEED AP BD+C), #11284468

LANGUAGES

  • Indonesian
  • Malay

Publications

Tjung, E. Y. S., Kularathna, S., Kumar, K., & Soga, K. (2020). “Modeling irregular boundaries using isoparametric elements in the Material Point Method.” Geo-Congress 2020 Proceedings, Minneapolis, MN, USA.

Kumar, K., Salmond, J., Wilkes, C., Tjung, E. Y. S., Biscontin, G., & Soga, K. (2019). “Scalable and modular Material Point Method for large-scale simulations.” MPM2019 Conference, Cambridge, UK.

Tjung. E. Y. S. (2014). “The implementation of Microelectromechanical Systems (MEMS) sensors for slope stability monitoring.” President’s Cup Report. HKUST Library.

Tjung, E. Y. S., Kaufmann, D., & Littman, M. G. (2014). “Joseph Henry’s house and plan for the Princeton Campus.” Journal of the Washington Academy of Sciences, 100(3), 49-72.

Presentations

Tjung, E. Y. S, Kularathna, S., Kumar, K., & Soga, K. “Modeling irregular boundaries using isoparametric elements in the Material Point Method.” Geo-Congress 2020, Minneapolis, MN, USA.

Tjung, E. Y. S. “Material Point Method for large deformation modeling in geomechanics using isoparametric elements.” Tokyo City University, Tokyo, Japan, 2019.

Tjung, E. Y. S. “Material Point Method for large deformation modeling in geomechanics using isoparametric elements.” Japanese Geotechnical Society (JGS) at Yamaguchi University, Yamaguchi, Japan, 2019.

Tjung, E. Y. S. “Modeling irregular boundaries using isoparametric elements in Material Point Method.” 12th MPM Workshop, Blacksburg, VA, USA.

Tjung, E. Y. S. “Material Point Method for large deformation modeling in geomechanics using isoparametric elements.” University of California, Berkeley – 3rd Annual Research Symposium, Berkeley, CA, 2019.

Tjung, E. Y. S. “Material Point Method for large deformation.” University of California, Berkeley – 2nd Annual Research Symposium, Berkeley, CA, 2018

Prior Experience

Rockridge Geotechnical, Staff Engineer, 2016

Arup, Graduate Engineer, 2014-2015

VSL & Intrafor, Intern, 2013-2014

Academic Appointments

Lecturer, Structural and Geotechnical Department, Calvin Institute of Technology, 2020

Graduate Student Researcher (Research Assistant), Civil & Environmental Engineering Department, University of California, Berkeley, 2017-2020

Graduate Student Instructor (Teaching Assistant), Civil & Environmental Engineering Department, University of California, Berkeley, 2016-2019

Professional Affiliations

American Society of Civil Engineers (ASCE)

International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE)

Young Member Presidential Group - ISSMGE

Earthquake Engineering Research Institute (EERI)

Natural Hazards Engineering Research Infrastructure (NHERI)

Hong Kong Institution of Engineers (HKIE)

The Institution of Engineers Indonesia (PII)

Indonesian Society for Geotechnical Engineer (HATTI)

Additional Information

Additional Education Training

Certificate of Teaching and Learning in Higher Education, University of California, Berkeley, 2018

Peer Reviewer

Journal of Soils and Foundations (Elsevier)

American Journal of Civil Engineer (Science Publishing Group)

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Civil and Environmental Engineering, University of California, Berkeley, 2020
  • M.S., Civil and Environmental Engineering, University of California, Berkeley, 2016
  • B.Eng., Civil and Environmental Engineering, Hong Kong University of Science and Technology (HKUST), 2014
  • Jane Lewis Fellowship, University of California, Berkeley, 2016-2018

    Civil and Environmental Engineering Outstanding GSI Award, University of California, Berkeley, 2018

    Outstanding Graduate Student Instructor Award, University of California, Berkeley, 2018

    Tor L. Brekke Award, University of California, Berkeley, 2016

    Harry Bolton Seed Memorial Fellowship, University of California, Berkeley, 2015

    AECOM Prize for Best Students of the Year 2014

    HKUST Academic Achievement Medal (Summa Cum Laude), HKUST, 2014

    HKUST President’s Cup – Gold Award, 2014

    Lo Bo Wing Memorial Exchange Scholarship, HKUST, 2013

    HKSAR Reaching Out Activities Scholarship, HKUST, 2013

    HKSAR Government Scholarship, HKUST, 2012

    Hong Kong Institute of Engineers (HKIE) Scholarship, HKUST, 2012

    University Scholarship, HKUST, 2011

LICENSES & CERTIFICATIONS

Licensed Professional Engineer, California, #C89298

Accredited Professional of Leadership in Energy and Environmental Design in Building Construction and Design (LEED AP BD+C), #11284468

LANGUAGES

  • Indonesian
  • Malay