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Geo-Micromechanics Research Group

Publications

Journal Publication

2023
1 Chen H., Tomac I. Technical review on coaxial deep borehole heat exchanger. Geomechanics and Geophysics for Geo-Energy and Geo-Resources. (2023)
2 Movasat M., De La Cruz A., Tomac I. Role of hydrophobic sand particle granularity on water droplet post-impact dynamics. International Journal of Multiphase Flow. 167: 104529 (2023)
3 Zhou D., Tatomir A., Tomac I., Sauter M. Effects of fracture aperture distribution on the performances of the enhanced geothermal system using supercritical CO2 as working fluid. Energy. 284:128655 (2023)
4 Tomac I., Zhu K., Wang Y. A comprehensive comparison and analysis of in-situ dynamic and static tests of a cased drilled shaft. DFI Journal 16(2) (2023)
2022
5 Tomac I., Kovačević Zelić B, Perić D., Domitrović D, Štambuk Cvitanović N., Vučenović H, Parlov J., Stipčević J., Matešić D., Matoš B, and Vlahović I. Geotechnical reconnaissance of an extensive cover-collapse sinkhole phenomenon of 2020–2021 Petrinja earthquake sequence (Central Croatia). Earthquake Spectra. OnlineFirst (2022).
7 Wei S. and Tomac I. Numerical evaluation of Failure Assessment Diagram (FAD) for hydraulic fracture propagation in sandstone. Engineering Fracture Mechanics. 263:108311 (2022)
8 Yamashiro B. D. and Tomac I. Fracture roughness effects on slickwater proppant slurry settling attenuation. Powder Technology. 395:516-533 (2022)
9 Yamashiro B.D. and Tomac, I. A numerical study of neutrally buoyant slickwater proppant flow and transport in rough fractures. Geomechanics for Energy and Environment. 29:100266 (2022)
2021
10 Movasat M. and Tomac I. Assessment of physical properties of water repellent soils. Journal of Geotechnical and Geoenvironmental Engineering. 147(9), 06021010 (2021)
11 Ma W. and Tomac I. Experimental investigation of proppant clustering in intersected fractures. Journal of Petroleum Exploration and Production Technology. 11:1727-1742 (2021)
14 Yamashiro B. D. and Tomac, I. Particle clustering dynamics in dense-phase particle-fluid slurries. Computers and Geotechnics. 132: 104038 (2021)
2020
15 Ma W., Perng J. and Tomac I. Experimental investigation of proppant flow and transport dynamics through fracture intersections, Geomechanics for Energy and Environment, 100232. 
16 Tomac, I. and Gutierrez, M. Micromechanics of hydraulic fracturing and damage in rock based on DEM modeling. Granular Matter, 22:56 (2020)
2019
17 Tomac, I. and Gutierrez, M. Micromechanics of hydro-thermo-mechanical processes in rock accounting for thermal convection. Journal of Engineering Mechanics, 145(8): 04019055 (2019)
19 Fjaestad, D. and Tomac, I. Experimental investigation of sand proppant particles flow and transport regimes through narrow slots. Powder Technology. 343: 495-511 (2019)
2018
20 Luo L. and Tomac, I. Experimental investigation of particle agglomeration effects on slurry settling in viscous fluid. Transport in Porous Media, 121: 333-352 (2018)
21 Tomac, I. and Sauter, M. A Review on challenges in the assessment of geomechanical rock performance for deep geothermal reservoir development. Renewable and Sustainable Energy Reviews, 82(3): 3972-3980 (2018)
22 Luo L. and Tomac, I. Particle image velocimetry (PIV) analysis of particle settling in narrow fracture experiments. Geotechnical Testing Journal, 41(2):354-370 (2018)
2017
23 Tomac, I. and Gutierrez M. Coupled hydro-thermo-mechanical modeling of hydraulic fracturing in quasi-brittle rocks using BPM-DEM. Journal of Rock Mechanics and Geotechnical Engineering, 9(1): 92-104 (2017)
24 Caulk R. and Tomac, I. Reuse of abandoned oil and gas wells for geothermal energy production. Renewable Energy, 112 (C): 388-397 (2017)
2016
25 McCartney, J.S., Sánchez, M., and Tomac, I. Energy geotechnics: Advances in subsurface energy recovery, storage, and exchange. Computers and Geotechnics, 75: 244-256. (2016)
2015
26 Tomac, I. and Gutierrez, M. Micromechanics of proppant agglomeration during settling in hydraulic fractures. Journal of Petroleum Exploration and Production Technology, 5: 417-434 (2015)
27 Tomac, I. and Gutierrez, M. Formulation and implementation of coupled forced heat convection and heat conduction in DEM. Acta Geotechnica, 10(4): 421-433 (2015)
2014
28 Tomac, I. and Gutierrez, M. Fluid lubrication effects on particle flow in a channel. International Journal of Multiphase Flow, 65: 143-156 (2014)
2013
29 Tomac, I. and Gutierrez, M. Discrete element modeling of non-linear submerged particle collisions. Granular Matter, 15: 759-769 (2013)

Research report

2022
6 Tomac I. and Chaves de Rosas J. Assessment of Maintenance Strategies for Bio-stabilization of Mudslides on Wildfire-affected Slopes. University of California Institute of Transportation Studies, UC-ITS-2021-48

Report

2021
12 Tomac I. and Zlatovic S. Geotechnical Reconnaissance and Engineering Effects of the December 29, 2020, M6.4 Petrinja, Croatia Earthquake, and Associated Seismic Sequence. A report to the NSF-Sponsored Geotechnical Extreme Event Reconnaissance (GEER) Association (2021)
13 EERI-StEER - Petrinja, Croatia (M6.4) Earthquake, Joint Preliminary Report. E. Miranda, S. Brzev, N. Bijelic, Ž. Arbanas, M. Bartolac, V. Jagodnik, D. Lazarević, S. Mihalić Arbanas, S. Zlatović, A. Acosta Vera, J. Archbold, J. Bantis, N. Blagojevic, J. Borozan, I. Božulić, C. Cruz, H. Dávalos, E. Fischer, S. Gunay, M. Hadzima-Nyarko, P. Heresi, D. Lignos, T. Lin, M. Marinkovic, S. Miranda, A. Messina, A. Poulos, G. Scagliotti, I. Tomac, I. Tomic, K. Ziotopoulou, Ž. Žugić, I. Robertson. PRJ-2959, DesignSafe-CI

Book chapter

2019
18 Bobet, A., Arson, C.F., Elsworth, D., Nelson, P., Tomac, I., Modiriasari, A. (2019). “The role of rock mechanics in the 21st Century.” (2019). Chapter 11 in Geotechnical Fundamentals for Addressing New World Challenges. N. Lu and J.K. Mitchell, Eds. Springer. 1-41. ISBN: 978-3-030-06249-1.

Conference publications

  1. Zhu D., Tatomir A., Tomac I. and Sauter M. Verification benchmark for a single-phase flow hydro-mechanical model comparison between COMSOL Multiphysics and DuMux. 2nd International Conference on Energy Geotechnics, La Jolla, CA, USA, on 10-13 April 2020. 205, 02002
  2. Movasat M. and Tomac I. Evaluation and remediation of post-wildfire slope stability. 2nd International Conference on Energy Geotechnics, La Jolla, CA, USA, on 10-13 April 2020. 205, 02002
  3. Movasat M. and Tomac I. Evaluation of Post-Impact Behavior of Single Droplet on the Hydrophobic Soil Surface. Geo-Congress, Charlotte, USA 2022
  4. Movasat M. and Tomac I. The Effect of Grain Size on Rainfall-Triggered Debris Flow in Hydrophobic Granular Slopes. Geo-Congress, Charlotte, USA 2022
  5. Tomac I., Vlahović I., Parlov J., Matos B., Matešić D., Kosović I., Pavičić I., Frangen T., Terzić J., Pavelić D., Kovačević Zelić B., Peric D., Domitrović D., Vučenović H., Štambuk Cvitanović N. and Pham N. Extensive Post-Seismic Cover-Collapse Sinkhole Opening During 2020–2021 Petrinja Earthquake Sequence (Croatia): a Unique Local Geological, Geotechnical and Hydrological Setting. AGU Fall Meeting, New Orleans, USA, 2021.
  6. Tomac I., Chavez de Rosas J., Lepe M., Ma W. and Movasat M.. Across-Scale Geomechanical Evaluation of Rain Intensity, Slope and Sand Type on Post-Wildfire Mudflow Composition and Onset Mechanisms. AGU Fall Meeting, New Orleans, USA, 2021.
  7. Bartolac M., Bijelic N. and Tomac I. 2nd Virtual and Field Reconnaissance of Structural and Geotechnical Damage of the 2020 Petrinja, Croatia M6.4 Earthquake: EESD Symposium - Seismic Analysis and Design of Nonstructural Components (2021)
  8. Ma W. and Tomac I. Combined Effect of Fluid Viscosity and Intersection Angle on Proppant Transport Through Intersected Fractures. 55th US Rock Mechanics/Geomechanics Symposium ARMA, Houston, TX, USA (2021)
  9. Yamashiro B.D. and Tomac I. Particle Clustering Mechanisms and Influence Proppant Flow and Transport, ARMA Golden, USA (2020)
  10. Yamashiro B.D. and Tomac I. Proppant Slurry Flow and Transport Within Fractures With Rough Surfaces, ARMA Golden, USA (2020)
  11. Wei S. and Tomac I. Evaluation of Hydro-Mechanical Inelastic Fracture Propagation in Weak Sandstone Reservoirs. AGU, San Francisco, USA (2020)
  12. Movasat M. and Tomac I. Understanding the onset of mudflows and droplet dynamic on water repellent tilted surfaces. AGU, San Francisco, USA (2020)
  13. Yamashiro B.D. and Tomac I. Proppant Transport Behavior in Varying Fracture Alignments. 53rd ARMA 53rd US Rock Mechanics/Geomechanics Symposium, New York City, USA (2019)
  14. Movasat M. and Tomac I. Post-fire Mudflow Prevention by Biopolymer Treatment of Water Repellent Slopes. GeoCongress, Minneapolis, MI, USA (2020)
  15. Tomac I. and Yamashiro, B.D. Micromechanics of dense-phase sand-fluid flow and transport in fractures. XVI Panamerican Conference on Soil Mechanics and Geotechnical Engineering, Cancun, Mexico (2019)
  16. Yamashiro B.D. and Tomac I. Proppant Transport Behavior due to Varying Fracture Geometry and Particle Concentration Distribution. EMI/G-I, Pasadena, CA, USA (2019)
  17. Yamashiro B.D. and Tomac I. Proppant Transport Behavior in Varying Fracture Alignments. 53rd ARMA 53rd US Rock Mechanics/Geomechanics Symposium, New York City, USA (2019)
  18. Yamashiro B.D. and Tomac I. Particle-Fluid Flow and Transport Between Geometrically Rough Surface Boundaries. DEM 8, Twente, Netherlands (2020)
  19. Tomac I., Fjaestad D. and Luo L. Experimental and Numerical Investigation of Micro-Mechanics of Particle-Fluid Flow and Transport. IS-Atlanta 2018: Geo-Mechanics from Micro to Macro, Atlanta, GA, USA (2018)
  20. Fjaestad D. and Tomac I. Proppant Flow and Transport in a Narrow Fracture in Turbulent Flow Regime, International Symposium on Energy Geotechnics (SEG-2018), EPFL Lausanne, Switzerland (2018)
  21. Fjaestad D. and Tomac I. Experimental Investigation of Proppant Flow and Transport in Narrow Fractures, ARMA 2018, Seattle, CA, USA (2018)
  22. Tomac I. and Tartakovsky D. Experimental Evaluation of Turbulent Flow and Proppant Transport in a Narrow Fracture, 43rd Workshop on Geothermal Reservoir Engineering Stanford University, CA, USA (2018)
  23. Caulk R.A. and Tomac I. Micro-mechanics of hydro-mechanical coupled processes during hydraulic fracturing in sandstone. AGU Fall Meeting, New Orleans, USA (2017)
  24. Caulk R. and Tomac I. Reuse of abandoned oil and gas wells for geothermal energy production. AGU Fall Meeting, San Francisco, CA, USA (2016)
  25. Tomac I. and Gutierrez M. Quantification of transient heat flow and damage around the borehole using conductive-convective heat flow and transport DEM model in synthetic rock. Proceedings of the 4th Itasca Symposium on Applied Numerical Modeling, Lima, Peru. p. 559-569 (2016)
  26. Tomac I. Hydro-thermo-mechanical behavior of granular material near the wellbore. Geo-Chicago 2016: Geotechnics for Sustainable Energy, Chicago, IL, USA,22-31 (2016)
  27. Luo L. and Tomac I. Particle image velocimetry analysis of proppant settling in a narrow slot. ARMA 2016, Houston, Texas, USA. ARMA-2016-652 (2016)
  28. Luo L. and Tomac I. Experimental study of proppant particle-particle interaction micromechanics during flow and transport in the fracture. 1st International Conference on Energy Geotechnics ICEGT 2016 in Kiel, Germany. p. 231-238 (2016)
  29. Tatomir A.B., Tomac I. and Sauter M. A parametric sensitivity study on CO2 injection in deep saline aquifers accounting for hydro-mechanical micro fracturing. 1st International Conference on Energy Geotechnics ICEGT 2016 in Kiel, Germany. 223-230 (2016)
  30. Tomac I., Tatomir A.B. and Sauter M. Effect of fracture surface damage on fluid flow and transport in geo-reservoirs. Second EAGE Workshop on Geomechanics and Energy, Celle, Germany (2015)
  31. Tomac I. and Gutierrez M. The effect of loading rate on hydraulic fracturing in synthetic granite: A Discrete element study. 2015 AGU Fall Meeting, San Francisco, CA, USA (2015)
  32. Tomac I. and Gutierrez M. Micromechanics of hydro-thermo-mechanical fracture propagation in granite. ARMA, Minneapolis, Minnesota, USA (2014)
  33. Tomac I. and Gutierrez M. Coupled hydro-thermo-mechanical modeling of hydraulic fracturing in quasi-brittle rocks using DEM. IS-Cambridge, UK (2014)
  34. Tomac I., Salkovic A. and Pest D. Case history on determination of old bridge foundation depths using parallel seismic method. XV Danube - European Conference on Geotechnical Engineering (DECGE) (2014)
  35. Tomac I. and Gutierrez M. Particulate modeling of sand slurry flow retardation. 18th International Conference on Soil Mechanics and Geotechnical Engineering (ICSMGE), Paris, France. September (2013)
  36. Tomac I. and Gutierrez M. Numerical study of horizontal proppant flow and transport in a narrow hydraulic fracture. 47th U.S. Rock Mechanics/Geomechanics Symposium ARMA, San Francisco, USA. June (2013)
  37. Tomac I. and Gutierrez M. DEM study of hydraulic fracturing in enhanced geothermal systems. European Geothermal Congress, Pisa, Italy. June (2013)
  38. Tóth A.N., McCartney J.S., Tomac I. and Balla L. Geothermal E-learning through Hungarian-American cooperation. European Geothermal Congress, Pisa, Italy (2013)
  39. Tomac I. and Gutierrez M. DEM Study of proppant settling in a rough hydraulic fracture in granite. DEM6 International Conference, Golden, CO. August (2013)
  40. Tomac I. and Gutierrez M. Convective-conductive heat flow in granite. DEM6 International Conference, Golden, CO. August (2013)
  41. Tomac I. and Gutierrez M. Evaluation of the Brazilian test size effect using Discrete Element Modeling. 46th U.S. Rock Mechanics/Geomechanics Symposium ARMA, Chicago, USA (2012)
  42. Tomac I. and Čorko D. Braced deep excavation projects in the City of Zagreb - Execution details and risk sources. 5th Meeting of the Croatian Geotechnical Society, Osijek, Croatia (2009)
  43. Marić B., Tomac I., Puljak S. and Lovrenćić D. Settlement measurements in the area of the town of Sisak over a period of 30 years. 6th Austrian Geotechnik Tagung, "Vienna - Terzaghi Lecture", Vienna, Austria (2007)
  44. Tomac I. and Marić B. Deep excavation case histories in the City of Zagreb. XIII Danube-European Conference on Geotechnical Engineering. Ljubljana, Slovenia (2006)
  45. Čorko D., Tomac I., Leko I. and Lašić A. Jet-grouting application for landslide remediation. In-country training program, principles of design, rehabilitation and monitoring of landslides. Sarajevo, Bosnia and Herzegovina (2005)
  46. Tomac I, Van Impe W.F., Verástegui Flores R.D. and Mengé P. Binder-soil interaction in cement deep mixing through SEM analysis. 16th ICSMGE Osaka, Japan (2005)
  47. Tomac I. and Marić B. Foundation design of the new cable stayed bridge over the Kupa river in the town of Sisak. Book of Papers of the 1st Meeting of Croatian Bridge Constructors, Brijuni Islands, Croatia (2005)
  48. Čorko D., Marić B. Lovrenčić D. and Tomac I. The application of jet-grouting method for landslide remediation. The 5th Šuklje Day, Rogaška Slatina, Slovenia (2004)
  49. Čorko D., Marić B. Lovrenčić D. and Tomac I. Application of jet grouting in slide remediation. ASEP-GI Paris, France (2004)
  50. Marić B., Kvasnička P. Radaljac D., Škacan B. and Tomac I. Use of combined soil nailing and geotechnical anchor system as the retaining structure for an open excavation. 3rd Nonveiller lecture, Hvar, Croatia (2004)
  51. Tomac I. Retaining structure for basement deepening. XIV European Young Geotechnical Engineering Conference (EYGEC), Plovdiv, Bulgaria (2001)
  52. Tomac I. Soil nailed retaining structure for the open excavation. International Young Geotechnical Engineering Conference (IYGEC), Southampton, UK. (2000)