Bibhu Mohanty

Professor Emeritus

  Mineral Section

Contact me

Bibhu Mohanty
Prof. Emeritus., Dept. of Civil Engineering
University of Toronto
35 St. George St.
Toronto, Ontario
Canada, M5S 1A4

Bibhu.mohanty@utoronto.ca

B.Sc (Hons), M.Tech. (IIT, India); M.A., Ph.D. (Toronto) ; P.Eng.

Prior to his current position, he held the NSERC Industrial Research Chair in Rock Dynamics and Fragmentation. In addition to his research activities, he consults regularly on blast and explosives related issues in the mining industry, and explosion hazards, blast-resistant and containment structures.

Research

MAJOR AREAS:
  • Rock dynamics and Fragmentation
  • Modeling of dynamic fracture process and Blasting
  • Detonation Physics and Performance of explosives
  • Impact, Strain-rate sensitivity, Strength and Fracture of rock
  • Explosion hazards and Blast resistant structures

 

Understanding dynamic fracture behaviour of rock is a key step in quantifying response of rock mass to high-energy transient loads such as in drilling and crushing of rock, and fragmentation due to explosive action. This is integral to all civil and mining excavation activities, and determines the safety, economic success, and viability of these operations.

The interaction between transient loads and the target rock is however extremely complex Both components are highly variables: the former on their magnitude, duration, rate of pressure application, and the manner of application; the latter on their strength, fracture characteristics, degree of anisotropy, and macro-structure such as joints, faults and foliation. For example, the detonation properties of commercial explosives such as pressure, energy and rate of pressure rise in borehole are highly dependent on specific in–use conditions. Similarly, the usual rock mechanics parameters obtained under static load conditions are not applicable under dynamic loads. Prediction of blast-induced fractures, fragment size distribution, improvement of drilling and crushing efficiency, and assuring safety of these operations thus represent formidable scientific and technical challenges.

The objective of my research group is to identify the key variables in this complex system, determine their relative importance through appropriate parametric studies. Direct experimental and systematic verification of theoretical predictions remains a cornerstone of this attempt to develop reliable ‘building blocks’, which can then be used to develop predictive models for fracture and fragmentation.

Recent Publications

Rock dynamics and Fragmentation

  1. Nasseri, M.H.B, Grasselli, G. and Mohanty, B., 2010, ‘Fracture toughness and fracture roughness in anisotropic granitic rocks’, J. Rock Mech. and Rock Engg., 43, (in press)
  2. Nasseri,M.H.B. and Mohanty, B., 2008, ‘Fracture toughness anisotropy in granitic rocks’, Int. J. Rock Mech. & Min. Sci.; 45, p. 167-193.
  3. Mohanty, B. Nasseri, M.H.B. and Paventi, M., 2007, “Strength and Micro-structural      Characteristics of Rocks and enhanced Fragmentation in Blasting, Proc. 4th EFEE World      Conference on Explosives and Blasting, Moser et al.(ed), European Fed. of Exploives Engrs., p. 39-46.
  4.  

    Nasseri, M H B., Grasselli, G., Mohanty, B, Wirth, J. and Braun, M.;2007, ‘Experimental      relationship between fracture toughness and fracture roughness in anisotropic granitic rocks”, Proc. Canada-US Rock Mech. Symp., Taylor & Francis, p. 617-624.

  5. Cho, S.H., Mohanty, B., Nakamura, Y., Ogata, Y., Kitayama, H. and Kaneko, K., 2007, ‘ Fracture processes of rocks in dynamic tensile splitting test’; Proc. 1st Canada-US Rock Mech. Symp., May 2007.
  6. Cho, S.H., Mohanty, B.,Ito, M., Nakamiya, Y., Owada, S., Kubota, S., Ogata, Y., Yokota, U., Kaneko, and Tsuboyama, A., 2006, “Dynamic Fragmentation of Rock by High-voltage Pulses”; Proc. 41st U.S. Rock Mech. Symp., Ed. D.P.Yale et al,ARMA, pp.1-10.
  7. Nasseri, MHB, Mohanty. B, and Young, RP, 2006. Fracture Toughness Measurement and Acoustic Emission Activity in Brittle Rocks, Pure and Applied Geophysics, 163, pp.917-945.
  8. Iqbal, M.J. and Mohanty, B., 2006, “Experimental calibration of stress intensity factors of the ISRM suggested Cracked Chevron-notched Brazilian Disc specimen used for determination of mode-I fracture toughness”, International J. of Rock Mech. & Min. Sci., 43, p.1270-1276.
  9. Iqbal, M.J. and Mohanty, B., 2006, “Calibration Studies involving Chevron-notched Brazilian Disc Method for Determination of Fracture Toughness”, Rock Mech. and Rock Engg.,39, pp.
  10.  

    Zhu, Z., Wang, L., Mohanty, B. and Huang, C., 2006, “Stress intensity factor for a cracked specimen under compression”; Engineering Fracture Mech., 73, pp. 482-489.

  11. Nasseri, M.H.B., Mohanty, B., and Robin, P-Y., 2005, “Characterization of Microstructures and Fracture Toughness in five granitic Rocks”; Int. J. Rock Mech. Min. Sci., 42 (3), p. 450-460.

     

  12. Iqbal, M.J. and Mohanty, B., 2005, “Fracture Toughness Measurements in Brittle Rocks”, Proc. 33rd CSCE Ann. Conf., GC 220:1-7.

Modelling of dynamic fracture process and blasting

  1. Trivino, L., Mohanty, B. and Munjiza, A., 2009, ‘Seismic radiation patterns from cylindrical explosive charges by combined analytical and combined finite-discrete element methods’, Proc. 9th Int. Symp. on Rock Fragmentation by Blasting (FRAGBLAST’9), Sanchidrian, (ed.), Taylor & Francis, p. 415-426.

     

  2. Trivino, L. and Mohanty, B., 2009,’Seismic radiation from explosive charges in the near-field: results from controlled experiments; Proc. 35th Ann. Conf. on Explosives and Blasting Tech., Int. Soc. Explosives Engrs., Vol.II, pp. 155-166.
  3.  

    Mohanty, B. and Banadaki, M.M.D., 2009, ‘Characteristics of stress-wave-induced fractures in controlled laboratory-scale blasting experiments, Proc. 2nd. Asian-Pacific Symp. on Blasting Techniques, Wang X. (ed), Metallurgical Industry Press, Beijing, p. 43-49.

  4.  

    Cho, S.H., Nakamura, Y., Mohanty, B., Yang, H.S., and Kaneko, K., 2008, Numerical study of fracture plane control in laboratory-scale blasting’; Engg. Fracture Mech., p. 39966-3984.

  5.  

    Zhu, Z., Xie, H, and Mohanty, B., 2007, ‘Numerical investigation of blasting-induced damage in cylindrical rocks’, Int. J. Rock Mech. and Min. Sci., 45, p. 111-121.

  6.  

    Zhu, Z., Mohanty, B. and Xie, H., 2007, ‘ Numerical investigation of blasting-induced crack initiation and propagation in rocks’, Int. J. Rock Mech. and Min. Sci., 44, p. 412-424.

  7.  

    Cho, S.H.,Kaneko, K., Mohanty, B., and Nakamura, Y., 2006,“Study of control of Crack Propagation in Blasting”, Proc. 8th Int. Symp. on Rock Fragmentation by Blasting, Santiago, Chile, Editec S.A.,pp.124-128.

  8.  

    Mohanty, B. and Yamin, G., 2005, “Probable causes of explosive system malfunction in Blasting”; Proc. 31st Ann. Conf. on Explosives and Blasting Tech., Int. Soc. Explosives Engrs., Vol.II, pp. 1-6.

  9.  

    Mohanty, B., Zhu, Z., and Paventi, M., 2005, “Numerical Simulation of Explosion-induced Fractures in Rock”; Proc. 5th Int. Symp. on Computer Applications in the Mineral Industry; Eds.,R.K.Singhal et al, pp. 1-14.

Detonation Physics and Performance of explosives

  1. Mohanty, B.,2009, ‘Intra-hole and inter-hole effects in typical blast designs and their implications on explosives energy release and detonator delay time’, Proc. 9th Int. Symp. on Rock Fragmentation by Blasting (FRAGBLAST’9), Sanchidrian, (ed.), Taylor & Francis, p. 23-34.
  2.  

    Mohanty, B.;2007, “Dynamic Blast Conditions and Explosives System Performance”; Proc.1st Asian-Pacific Symposium on Blasting Techniques, China Soc. Engg. Blasting, Kunming, Wang X. (ed), Metallurgical Industry Press, Beijing, p.16-19.

Impact, Strain-rate sensitivity, Strength and Fracture of rock

  1. Cho, S. H., Kim, S.K., Mohanty, B, Xia, K. and Katsuhiko, K, 2009,’3-dimensional visualization of granitic rocks subjected to impact loading using Micro-focus X-ray CT scanner’, Proc. 9th Int. Symp. on Rock Fragmentation by Blasting (FRAGBLAST’9), Sanchidrian, (ed.), Taylor& Francis, p. 23-34.

     

  2. Xia, K.W., M.H.B. Nasseri, B. Mohanty, F. Lu and Y. Lin,2007, "Effect of micro-structure on dynamic compression of Barre granite", Proc. 2007 SEM Annual Conference & Exposition, Springfield, Massachusetts, June 3 - 6, 2007.
  3.  

    Xia, K., Nasseri, M.H.B., Mohanty, B., Lu, F., Chen, R. and Luo, S.N., 2007, ’Effects of microstructures on dynamic compression of Barre granite’, Int. J. Rock Mech. and Min. Sci., 45, p. 879-887.

  4.  

    Feng, D., K.W. Xia, M.H.B. Nasseri and B. Mohanty,2007, "Crack microcrack interaction and fracture toughness anisotropy in rocks", Proc. 2007 SEM Annual Conference & Exposition, Springfield, Massachusetts, June 3 - 6, 2007.

Explosion hazards and Blast resistant structures

  1. Mohanty, B., 2010, “Physics of Explosion Hazards”; in Forensic Investigation of Explosions, S. Beveridge, (Ed). 2nd Edition, CRC Press, Boca Raton, p. 15-46 (in press).
  2.  

    Singh, P.K, Singh, A.K., and Mohanty, B.,2010, ‘Impact of open-pit blasting on multi-seam workings of an adjoining underground coal mine’;CIM Bull., (in press).

  3.  

    Singh, P.K., Mohanty, B., and Roy, M.P., 2006, “Calculation of Effective Charge Weight in Vibration Analysis”; Proc. 32nd Ann. Conf. on Explosives and Blasting Tech., Int. Soc. Explosives Engrs., Vol.II, pp. 1-10.

  4.  

    Singh, P.K., Mohanty, B., and Roy, M.P.,2006, “Effective Delay Design in Multi-row Blasts in Open-cast Coal Mines”; Proc. 8th Int. Symp. on Rock Fragmentation by Blasting, Santiago, Chile, Editec S.A.,pp 400-405

  5.  

    Singh, P.K., Mohanty, B. and Roy, M.P., 2005, “Variation of Characteristic Parameters in Vibration Studies from Production Blasts in Coal Mines”; Proc. 3rd EFEE World Conf. on Explosives and Blasting, Eds. R. Holmberg et al, Francis Taylor, London, pp.551-556.

Keynote/Invited Scholarly Addresses/Membership

  • Keynote Address;’ Mohanty, B., 2009, “Sympathetic effects on explosives performance under typical blasting operations – A Critical Review; Keynote Address, 9th Int. Symp. on Rock Fragmentation by Blasting (FRAGBLAST’9), Granada, September 2009.
  •  

    Plenary Speaker: Optimizing Productivity in Drilling and Blasting; Marcus Evans Conferences, Perth, Australia, July 2-4, 2007.

  •  

    Keynote Address: Mohanty, B.,2006, “Rock Fragmentation Research – a Review”: Plenary Session, 1st Asian Mining Congress, Kolkata, India, Jan.16-18, 2006.

  •  

    Workshop Leader: “Fracture Toughness in Rocks”; 3rd Asian Rock Mech, Symp. (Int. Soc. Rock Mech.), Singapore, Nov.7-10, 2006.

  •  

    Plenary Speaker: Global Development in Blasting and Rock Fragmentation; July 11-12,2005, Tehran, Iran.

     

  • Editorial Board: Int. J. of Surface Mining and Reclamation (2008 - )

     

  • Member: International Organizing Committee for International Symposia on Rock Fragmentation by Blasting (1993 - )

     

  • Life-time Emeritus Member: (for outstanding contributions); International Society of Explosives Engineers (2010)

Teaching

Course Code Title & Description Instructor Session Day(s) Start Time End Location(s)