THE TRANSPARENT LAB

Micro-CT: Phoenix v|tome|x micro-CT

Phoenix v|tome|x micro-CT is a versatile high-resolution system for 2D X-ray and 2D computed tomography, equipped with an open directional high-power microfocus X-ray tube. The Phoenix v|tome|x is capable of generating images with voxel size down to 5 microns and a maximum 3D scanning sample size up to 260mm x 420mm (diameter x height) and 10 kilograms. 6-axes (x, y, z, rotation, tilt, and detector shift) CNC provides accurate and stable sample positioning that gives reproducible precision 2D and 3D imaging.

Zhao, Q., Glaser, S. D., Tisato, N., & Grasselli, G. (2020). Assessing Energy Budget of Laboratory Fault Slip Using Rotary Shear Experiments and Micro-Computed Tomography. Geophysical Research Letters, 47(1). https://doi.org/10.1029/2019gl084787 Cite
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. Cite
Zhao, Q., Glaser, S. D., Tisato, N., & Grasselli, G. (2019). Assessing Energy Budget of Laboratory Fault Slip Using Quantitative Micro-CT Image Analysis. 6. Cite
Hu, J. (2019). Characterization of Pipeline Exterior and Interior Coating Material [MASc Thesis, University of Toronto]. Cite
Magsipoc, E. (2019). Quantifying the Fracture Process using Surface Roughness Parameters [MASc Thesis, University of Toronto]. Cite
Abdelaziz, A. (2019). Fluid-induced Dynamic Fracturing Process - A Laboratory Approach. Energi Simulation Visit, University of Toronto. Cite
Zhao, Q., Tisato, N., Kovaleva, O., & Grasselli, G. (2018). Direct Observation of Faulting by Means of Rotary Shear Tests Under X-Ray Micro-Computed Tomography. Journal of Geophysical Research-Solid Earth, 123(9), 7389–7403. Cite
Kalogerakis, G. C., Zhao, Q., Grasselli, G., & Sleep, B. E. (2018). In situ chemical oxidation processes: 4D quantitative visualization of byproduct formation and deposition via micro-CT imaging. The Leading Edge, 37(6), 462–467. https://doi.org/10.1190/tle37060462.1 Cite
Zhao, Q., Tisato, N., & Grasselli, G. (2018). Rotary shear test under X-ray micro-computed tomography. 52nd U.S. Rock Mechanics/Geomechanics Symposium, Seattle. Cite
Zhao, Q., Tisato, N., & Grasselli, G. (2017). Rotary shear experiments under X-ray micro-computed tomography. The Review of Scientific Instruments, 88(1), 015110. https://doi.org/10.1063/1.4974149 Cite
Ha, J. (2017). FDEM Tunnel Modelling in Georgian Bay Shale [MASc Thesis, University of Toronto]. Cite
Tisato, N., Zhao, Q., & Grasselli, G. (2016). Experimental rock physics under micro-CT (C. Sicking & J. FergusonSicking, Eds.; Vol. 35, pp. 3251–3255). Society of Exploration Geophysicists; Scopus. https://doi.org/10.1190/segam2016-13949603.1 Cite
Tisato, N., Zhao, Q., & Grasselli, G. (2016). Experimental rock deformation under micro-CT - Two new apparatuses for rock physics. 78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential. Scopus. Cite
Tisato, N., Quintal, B., Chapman, S., Madonna, C., Subramaniyan, S., Frehner, M., Saenger, E. H., & Grasselli, G. (2014). Seismic attenuation in partially saturated rocks: Recent advances and future directions. Leading Edge, 33(6), 640–646. Scopus. https://doi.org/10.1190/tle33060640.1 Cite
Tatone, B. S. A., & Grasselli, G. (2014). Characterization of the effect of normal load on the discontinuity morphology in direct shear specimens using X-ray micro-CT. Acta Geotechnica, 10(1), 31–54. Scopus. https://doi.org/10.1007/s11440-014-0320-5 Cite
Mahabadi, O. K., Tatone, B. S. A., & Grasselli, G. (2014). Influence of microscale heterogeneity and microstructure on the tensile behavior of crystalline rocks. Journal of Geophysical Research: Solid Earth, 119(7), 5324–5341. Scopus. https://doi.org/10.1002/2014JB011064 Cite
Mahabadi, O. K., Cottrell, B., & Grasselli, G. (2010). An Example of Realistic Modelling of Rock Dynamics Problems: FEM/DEM Simulation of Dynamic Brazilian Test on Barre Granite. Rock Mechanics and Rock Engineering, 43(6), 707–716. Cite

Experimental Rock Physics: ERDμ-Q and ERDμ-T

Used in the measurement of seismic wave attenuation, the X-Ray transparent ERDμ-Q vessel is used in conjunction with a micro-CT machine for continuous imaging. The vessel is able to apply confining pressures up to 30 MPa and pore pressures up to 20 MPa with varying fluids for a 12 x 36 mm cylindrical sample. The vessel applies a sinusoidal variation of the vertical stress, and with an axial load cell and a cantilever system quantifies a complex Young’s modulus of the specimen to derive the seismic attenuation for a given material.

Similar to the ERDμ-Q, the ERDμ-T vessel can be used to observe rotary shear effects on a slipping surface with a micro-CT imaging machine for continuous imaging during rotary shear deformation. The rate of rotary shear varies from 0.8 to 48mm/s. The ERDμ-T vessel is also able to generate confining pressures up to 30 MPa, for a sample size of 12 x 36 mm. Being able to image the 4D progression of slipping mechanics and the slip surface characteristics, the ERDμ-T provides new capabilities to understand gauge layers on rock friction during shear mechanisms.

Zhao, Q., Glaser, S. D., Tisato, N., & Grasselli, G. (2020). Assessing Energy Budget of Laboratory Fault Slip Using Rotary Shear Experiments and Micro-Computed Tomography. Geophysical Research Letters, 47(1). https://doi.org/10.1029/2019gl084787 Cite
Zhao, Q., Glaser, S. D., Tisato, N., & Grasselli, G. (2019). Assessing Energy Budget of Laboratory Fault Slip Using Quantitative Micro-CT Image Analysis. 6. Cite
Zhao, Q., Tisato, N., Kovaleva, O., & Grasselli, G. (2018). Direct Observation of Faulting by Means of Rotary Shear Tests Under X-Ray Micro-Computed Tomography. Journal of Geophysical Research-Solid Earth, 123(9), 7389–7403. Cite
Zhao, Q., Tisato, N., & Grasselli, G. (2018). Rotary shear test under X-ray micro-computed tomography. 52nd U.S. Rock Mechanics/Geomechanics Symposium, Seattle. Cite
Zhao, Q., Tisato, N., & Grasselli, G. (2017). Rotary shear experiments under X-ray micro-computed tomography. The Review of Scientific Instruments, 88(1), 015110. https://doi.org/10.1063/1.4974149 Cite
Tisato, N., Zhao, Q., & Grasselli, G. (2016). Experimental rock physics under micro-CT (C. Sicking & J. FergusonSicking, Eds.; Vol. 35, pp. 3251–3255). Society of Exploration Geophysicists; Scopus. https://doi.org/10.1190/segam2016-13949603.1 Cite
Tisato, N., Zhao, Q., & Grasselli, G. (2016). Experimental rock deformation under micro-CT - Two new apparatuses for rock physics. 78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential. Scopus. Cite
Tisato, N., Quintal, B., Chapman, S., Madonna, C., Subramaniyan, S., Frehner, M., Saenger, E. H., & Grasselli, G. (2014). Seismic attenuation in partially saturated rocks: Recent advances and future directions. Leading Edge, 33(6), 640–646. Scopus. https://doi.org/10.1190/tle33060640.1 Cite
Tisato, N., Quintal, B., Chapman, S., Madonna, C., Subramaniyan, S., Frehner, M., Saenger, E. H., & Grasselli, G. (2014). Seismic attenuation in partially saturated rocks: Recent advances and future directions. Leading Edge, 33(6), 640–646. https://doi.org/10.1190/tle33060640.1 Cite

Material Charactierization: Nanovea Micro- and Nano-Indenter

The Nanovea Micro- and Nano- Material testing modules gauge material properties through indentation and scratch testing on varying scales. Micro and Nano indentation modules can assess material hardness, elastic modulus, fracture toughness and yield strength. The microindenter module are used with sphereconical and Vickers tips while the nanoindentation module are available in the Berkovich tip.

Ay, B., Parolia, K., Liddell, R. S., Qiu, Y., Grasselli, G., Cooper, D. M. L., & Davies, J. E. (2020). Hyperglycemia compromises Rat Cortical Bone by Increasing Osteocyte Lacunar Density and Decreasing Vascular Canal Volume. Communications Biology, 3(1), 20. Cite
Qiu, Y., Peterson, K., Grasselli, G., Moslow, T., & Adams, M. (2018). Micromechanical characterization of the lower Triassic Montney Claraia biostrome. 52nd U.S. Rock Mechanics/Geomechanics Symposium, Seattle. Cite
Qiu, Y., Abdelaziz, A., Peterson, K., & Grasselli, G. (2018). Modelling of concrete weight coating based on micromechanical characterization. RILEMweek/CONMOD, Delft Netherlands. Cite
Qiu, Y., Ha, J., Peterson, K., & Grasselli, G. (2017). Finite-Discrete  Element Modeling of time-dependent mechanisms in southern Ontario Shales. 70th Canadian Geotechnical Conference, Ottawa. Cite

Multi-scale Surface Scanning: ATOS II 3D Surface Scanner

ATOS uses advance measuring and projection techniques to produce high quality data and precision accuracy for full-object dimensional analysis. It can measure shiny surfaces and complex component with pocket and/or fine edges. 3 high quality optical cameras capable of 16 million points per scan (PPS) work independently for maximum data collection and minimum number of scan, thereby reducing overall measurement time. Narrow band blue light technology improves the scanning of dark or coloured surfaces, also enables precise measurements to be carried out independently of environmental lighting conditions, thereby reduces heat development. Interchangeable measuring volumes and various configurations allow for project versatility.

Magsipoc, E., & Grasselli, G. (2020, June 28). Describing the fracture process using surface roughness parameters. 54th U.S. Rock Mechanics / Geomechanics Symposium, Golden, Colorado. Cite
Magsipoc, E., Zhao, Q., & Grasselli, G. (2019). 2D and 3D Roughness Characterization. Rock Mechanics and Rock Engineering. Cite
Hu, J. (2019). Characterization of Pipeline Exterior and Interior Coating Material [MASc Thesis, University of Toronto]. Cite
Magsipoc, E. (2019). Quantifying the Fracture Process using Surface Roughness Parameters [MASc Thesis, University of Toronto]. Cite
Zhou, H. (2019). Roughness, Shear, and Dilation. Energi Simulation Visit, University of Toronto. Cite
Magsipoc, E. (2019). Decoding Fracture Roughness. Energi Simulation Visit, University of Toronto. Cite
Zhou, H., Abdelaziz, A., & Grasselli, G. (2018). Rock Dilation and Its Effect on Fracture Transmissivity. 6. Cite
Zhou, H., Zhao, Q., & Grasselli, G. (2018). Dilation of rock joints based on quantified surface description. Geoconvention, Calgary. Cite
Zhou, H., & Grasselli, G. (2018). Dilation of rock joints based on quantified surface description. 52nd U.S. Rock Mechanics/Geomechanics Symposium, Seattle. Cite
Zhao, Q., & Grasselli, G. (2018). Understanding shear behaviour of a rough joint using surface topography scan and numerical simulation. Geoconvention, Calgary. Cite
Tatone, B. S. A., & Grasselli, G. (2013). An Investigation of Discontinuity Roughness Scale Dependency Using High-Resolution Surface Measurements. Rock Mechanics and Rock Engineering, 46(4), 657–681. https://doi.org/10.1007/s00603-012-0294-2 Cite
Tatone, B. S. A., & Grasselli, G. (2013). An Investigation of Discontinuity Roughness Scale Dependency Using High-Resolution Surface Measurements. Rock Mechanics and Rock Engineering, 46(4), 657–681. https://doi.org/10.1007/s00603-012-0294-2 Cite
Tatone, B. S. A., & Grasselli, G. (2012). Quantitative Measurements of Fracture Aperture and Directional Roughness from Rock Cores. Rock Mechanics and Rock Engineering, 45(4), 619–629. https://doi.org/10.1007/s00603-011-0219-5 Cite
Tatone, B. S. A., & Grasselli, G. (2012). Quantitative Measurements of Fracture Aperture and Directional Roughness from Rock Cores. Rock Mechanics and Rock Engineering, 45(4), 619–629. https://doi.org/10.1007/s00603-011-0219-5 Cite
Cottrell, B., Tatone, B. S. A., & Grasselli, G. (2010). Joint replica shear testing and roughness degradation measurement. 207–210. Scopus. Cite
Cottrell, B., Tatone, B. S. A., & Grasselli, G. (2010). Joint replica shear testing and roughness degradation measurement. In Rock Mechanics in Civil and Environmental Engineering (pp. 227–230). CRC Press. Cite
Tatone, B. S. A., & Grasselli, G. (2009). A method to evaluate the three-dimensional roughness of fracture surfaces in brittle geomaterials. Review of Scientific Instruments, 80(12), 125110. https://doi.org/10.1063/1.3266964 Cite
Tatone, B. S. A., & Grasselli, G. (2009). A method to evaluate the three-dimensional roughness of fracture surfaces in brittle geomaterials. Review Of Scientific Instruments, 80(12), 125110. https://doi.org/10.1063/1.3266964 Cite
Nasseri, M. H. B., Tatone, B. S. A., Grasselli, G., & Young, R. P. (2009). Fracture Toughness and Fracture Roughness Interrelationship in Thermally treated Westerly Granite. Pure and Applied Geophysics, 166(5–7), 801–822. Cite
Nasseri, M. H. B., Tatone, B. S. A., Grasselli, G., & Young, R. P. (2009). Fracture Toughness and Fracture Roughness Interrelationship in Thermally treated Westerly Granite. In S. Vinciguerra & Y. Bernabé (Eds.), Rock Physics and Natural Hazards (pp. 801–822). Birkhäuser Basel. Cite
Nasseri, M., Grasselli, G., Mohanty, B., & Cho, S. (2007, September 25). Three-dimensional observation of the fracture process zone in anisotropic granitic rock by x-ray CT scan. Euro-conference of Rock Physics and Geomechanics on’Natural Hazards: Thermo-hydro-mechanical coupling processes in rocks’, Erice, Italy. Cite
Nasseri, M. H. B., Grasselli, G., Mohanty, B., Wirth, J., & Braun, M. (2007). Experimental relationship between fracture toughness and fracture roughness in anisotropic granitic rocks. 1, 617–624. Scopus. Cite
Grasselli, G., Wirth, J., & Egger, P. (2002). Quantitative three-dimensional description of a rough surface and parameter evolution with shearing. International Journal of Rock Mechanics and Mining Sciences, 39(6), 789–800. Cite
Grasselli, G. (2001). Shear strength of rock joints based on quantified surface description [PhD Thesis, EPFL (Lausanne)]. Cite
Grasselli, G., Egger, P., Wirth, J., & Hopkins, D. (2001). Characterization of the parameters that govern the peak shear strength of rock joints (Elsworth, Tinucci, & Heasley, Eds.; pp. 817–821). American Rock Mechanics Association (ARMA); Scopus. Cite
Grasselli, G., & Egger, P. (2000). Shear strength equation for rock joints, based on 3-D surface characterization. ISRM International Symposium 2000, IS 2000. Scopus. Cite
Grasselli, G., & Egger, P. (2000). Three-dimensional optical measurement and characterization of rough surfaces. GSA meeting, Reno, USA. Cite

Material Fabrication: ExOne Innovent Particulate Printer

The ExOne particulate printer uses an additive manufacturing process that selectively bind thing layers of particulate, ranging from metals to sand, to make a near-net shape object. Rock analogues can be printed and cured in short amounts of time, mimicking real pore structures and pathways, allowing realistic reproductions of rock samples. Being able to produce medium-strength sandstones in prescribed shapes and geometries, the ExOne Innovent particulate printer aids in investigating the role of internal fractures and defects in rock mechanical testing.

Precision Delivery Syringe pumps: Vindum VP-Series

The VP-series pumps available at our labs are able to pump at a large range of high pressures at very precise flow rates. Dual cylinder pumps allow continuous delivery without interruption in flow, and with an external reservoir, is able to provide unlimited volumes of viscosities up to ~200,000cps. A hastalloy housing allows us to delivery highly saline solutions as well, making a large range of possible experimental conditions. The two cylinders can also maintain pressure in a continuous manner, and produce a self-balancing pressure circuit in a pulse-free delivery manner governed by easily tuned PID controls.

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. Cite

Computation: NVIDIA DGX Station

The NVIDIA DGX Station is a powerful computer that packs server-grade hardware into a workstation for high performance computing. The highlight of the system is that it is equipped with 4 state-of-the-art 32 GB Quadro V100 GPUs with NVLink. Addtionally, it is equipped with an Intel Xeon 20-core CPU and 256 GB of system memory. Due to the nature of FDEM, it is an extremely computationally expensive task. With this workstation, we are able to run much larger models due to the higher GPU memory, and finish simulations much faster due to the powerful computational architecture of modern GPUs.