Internt


  
 KTH / Institutionen för Mark- och vattenteknik /
Personal

 

Tomofumi Koyama

Ph. D. Student (Doktorand)

Engineering Geology and Geophysics Group

Adress: Teknikringen 72, KTH, SE-100 44 Stockholm

Telefon: +46 8 790 6807

Epost:tomofumi@kth.se

Education

  • Oct. 2002  Ph. D. Student of KTH
  • 2001-2002  Department of Civil Engineering System (Doctor course), Graduate School of Engineering, Kyoto University, Japan.
  • 1999-2001 Department of Civil Engineering System, Graduate School of Engineering, Kyoto University, Japan. Awarded the degree of Master of Engineering in the field of Civil Engineering for a thesis entitled "The Deformation Analysis Considering Water Effect by Manifold Method"
  • 1995-1999 Faculty of Engineering, Kyoto University, Japan. Awarded the degree of Bachelor of Engineering in the field of Civil Engineering for a thesis entitled "The Seepage Analysis by Manifold Method"

Research Field

  • Coupled Hydro-mechanical Behavior of Fractured Rock Mass
  • Numerical Simulation using Manifold Method (MM) and Finite Element Method (FEM)
  • Shear-Flow Coupling Test for Single Rock Joint
  • Groundwater flow Analysis

      What is Manifold Method (MM)??                                                                       

The Manifold Method (MM), originally developed by Shi in 1991, is one of the progressing numerical methods for analyzing discontinuous media. The MM, uses finite element meshes on the DDA blocks, has advantages of both the discontinuous DDA and continuous FEM models at the same time.

 

 


Publications

International journals & books

Vilarrasa, V., Koyama, T., Neretnieks, I., Jing, L. (2011): Shear-Induced Flow Channels in a Single Rock Fracture and Their Effect on Solute Transport Transport in Porous Media 87(2), 503-523

Rutqvist, J., Bäckström, A., Chijimatsu, M., Feng, X.-T., Pan, P. Hudson, J.A., Jing, L., Kobayashi, A., Koyama, T., Lee, H.-S., Huang, X.-H., Rinne, M., Shen, B. (2008): A multiple-code simulation study of the long-term EDZ evolution of geological nuclear waste repositories. Environmental Geology, ISSN: 0943-0105 (Print) 1432-0495

Koyama, T., Li, B., Jiang, Y., Jing, L. (2008): Numerical simulation for the effects of normal loading on particle transport in rock fractures during shear. Int. J. Rock Mech. Min. Sci., 45(8): 1403-1419.

Koyama, T., Li, B., Jiang, Y., Jing, L. (2008): Coupled shear-flow tests for rock fractures with visualization of the fluid flow and their numerical simulations. Int. J. Geotechnical Engineering, 2(3), 215-227.

Li, B., Jiang, Y., Koyama, T., Jing, L., Tanabashi, Y. (2008): Experimental study of the hydro-mechanical behavior of rock joints using a parallel-plate model containing contact areas and artificial fractures. International Journal of Rock Mechanics and Mining Sciences 45(3), 362-375.

Koyama, T., Neretnieks, I., Jing, L. (2008): A numerical study on differences in using Navier-Stokes and Reynolds equations for modeling the fluid flow and particle transport in single rock fractures with shear. International Journal of Rock Mechanics and Mining Sciences 45(7), 1082-1101.

Bäckström, A., Antikainen, J., Backers, T., Feng, X., Jing, L., Kobayashi, A., Koyama, T., Pan, P., Rinne, M., Shen, B., Hudson, J.A. (2008): Numerical modelling of uniaxial compressive failure of granite with and without saline porewater International Journal of Rock Mechanics and Mining Sciences 45(7), 1126-1142.

Koyama, T., Jing, L. (2007): Effects of model scale and particle size on micro-mechanical properties and failure processes of rocks - A particle mechanics approach. Engineering Analysis with Boundary Elements 31(5), 458-472. Special issue of Innovative Numerical Methods for Micro and Nano Mechanics and Structures - Part I.

Koyama, T., Fardin, N., Jing, L., Stephansson, O. (2006): Numerical simulation of shear-induced flow anisotropy and scale-dependent aperture and transmissivity evolution of rock fracture replicas. Int. J. Rock Mech. Min. Sci. 43(1), 89-106.

Koyama, T., Fardin, N., Jing, L. (2004): Shear induced anisotropy and heterogeneity of fluid flow in a single rock fracture by translational and rotary shear displacements – a numerical study. Int. J. Rock Mech. Min. Sci. (SINOROCK2004 Paper 2A 08), 41(3), 426.

Koyama, T., Fardin, N., Jing, L. (2004): Shear-induced anisotropy and heterogeneity of fluid flow in a single rock fracture with translational and rotary shear displacements - a numerical study. Int. J. Rock Mech. Min. 41 (3), 426-426.

Conference publications

Koyama, T., Jing, L. (2007): Fluid flow and tracer transport simulations for rock fractures under normal loading and shear displacement. In: Proc of the 11th Int Congr Rock Mech (ISRM 2007), Lisbon, Portugal, 9-13 July, 2007, pp. 47-50.

Koyama, T., Jing, L. (2006): Effects of shearing processes on the fluid flow and particle transport in a single rock fracture. Rock Mechanics in Underground Construction, Proc of the 4th Asian Rock Mech Symp, eds. Leung CF Y and Zhou YX, World Scientific, 2006, pp. 408.

Koyama, T., Vilarrasa, V., Jing L. (2006): Particle transport in a rough rock fracture during shear - a numerical study. Proc. of the 2nd International Conference on Coupled T-H-M-C Processes in Geo-Systems: Fundamentals, Modeling, Experiments and Applications, GeoProc 2006, pp. 575-580.

Koyama, T., Jing, L. (2006): Particle mechanics approach for simulating micro-structure damage and failure processes of rock core samples due to different fluid salinity. Proc. of the 2nd International Conference on Coupled T-H-M-C Processes in Geo-Systems: Fundamentals, Modeling, Experiments and Applications, GeoProc 2006, pp. 569-574.

Koyama, T., Takagi, K., Yano, T. Ohnishi, Y. (2002): A Study of Hydraulic Characteristics of Single Rock Joint under Shear Deformation for Geological Disposal. Proc. of the Second Japan-Korea Joint Seminar of Geoenvironmental Engineering, pp. 69-74.

Ohnishi, Y. Ohtsu, H., Nishiyama, S. Koyama, T., Wu, J.-H. (2001): Deformation Analysis Considering Water Effect by Manifold Method. Proc. of the Forth International Conference on Analysis of Discontinuous Deformation (ICCAD-4 in Glasgow), pp. 47-62.

Ohnishi, Y., Tanaka, M., Koyama, T., Mutoh, K. (1999): Manifold Method in Saturated -unsaturated Unsteady Groundwater Flow Analysis. Proc. of the Third International Conference on Analysis of Discontinuous Deformation (ICCAD-3 in Colorado), pp. 221-230.

Reports & compendia

Koyama, T., Jing, L. (2007): Numerical simulation of core tests - a particle mechanics approach. In: DECOVALEX-THMC Task B, Understanding and characterizing the excavation disturbed zone (EDZ), Phase 2 Report, JA Hudson and L Jing, eds. SKI Report 2007:08, 2007, pp 57-76.

Koyama, T., Zhang, G., Jing, L. (2006): Mechanical Integrity of Canisters Using a Fracture Mechanics Approach. SKI Report 2006:36.

Doctoral thesis

Koyama, T. (2007): Stress, flow and particle transport in rock fractures. TRITA-LWR PHD 1036. Doctoral Thesis in Land and Water Resources Science, KTH Architecture and the Built Environment, Stockholm.

Licentiate thesis

Koyama, T. (2005): Numerical modelling of fluid flow and particle transport in rock fractures during shear. TRITA-LWR LIC 2033. Licentiate Thesis in Land and Water Resources Engineering. KTH Architecture and the Built Environment, Stockholm.







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