Dr Benjy Marks

BEng/BSc (Hons I), PhD in Civil Engineering
Lecturer in Geomechanics
School of Civil Engineering

J05 - J05 Civil Engineering Building
The University of Sydney

Telephone +61 2 9351 4383

Website Immersive Learning Laboratory

School of Civil Engineering

SciGEM

Research interests

Anyone who has ever opened a packet of cereal knows that all the small crumbs will be at the bottom while the larger pieces will be at the top. The same phenomenon occurs in landslides, avalanches and the processing of pharmaceutical powders, among other things. It is this behaviour - along with its more serious implications - that Dr Benjy Marks researches.

"The more we understand about landslides, the more questions we have. We now know that we can't describe a landslide as being made up of a uniform material, because it very quickly segregates, so we need to understand the properties of all of the constituents that make up the landslide, and how they interact. The same thing applies when we make pharmaceutical tablets - the active ingredient, which is usually very small, can easily separate from the rest of the powders, so if we treated all this material the same way we would end up with tablets of varying concentration.

"I develop a suite of mathematical and numerical models of landslides, avalanches and other granular media, such as pharmaceutical powders, so we can make sense of what's going on. Then we can make predictions about what will happen in the real world.

"Granular materials are one of the most common materials we deal with, yet strangely we know very little about them. They exhibit such rich behaviours that describing them comprehensively is no mean feat.

"My research focuses on granular materials where the constituent grains are of different sizes - such as landslides with boulders in them. Lots of interesting things happen in these cases: crushing, mixing, segregation, melting, agglomeration and so on. Describing all of these things in one coherent framework is my current goal.

"This will then assist us to design structures that can protect people against landslides and avalanches, for example. It will also have applications in other areas such as block cave mining, bulk material transport, industrial milling operations, coffee grinding and fibre-reinforced concrete mixing.

"Having completed my undergraduate and postgraduate degrees at the University of Sydney, I returned as a staff member in 2015. The research group I work with here is truly a team of world-leading pioneers in granular mechanics, geomechanics and a host of related fields. It is a privilege to work with such motivated, inspiring and positive researchers."

Current research students

Project title Research student
A hydrodynamic model of granular media considering gas, liquid and solid regimes, using the MPM Ebrahim ALAEI
Pull-out capacity of soil anchors under dynamic loading Tanvir HOSSAIN
Granular flow through a scale model forest. Hang LUONG
Modelling of vibrationally induced convective granular flows and granular segregation using granular solid hydrodynamics constitutive framework Mara MARANIC
Instability of Unsaturated Soil Slopes in Rainfall-Induced Landslides Simon SHI

In the media


    International collaboration


      Domestic collaboration


        Themes

        Materials and structures

        Selected grants

        2017

        • A virtual reality learning laboratory for diverse environments; Thomas J, Gibbens P, Marks B; DVC Education/Large Educational Innovation Grant.
        • The role of pressure waves on the mechanics of earthquakes and faulting; Marks B, Regenauer-Lieb K, Schrank C; Australian Research Council (ARC)/Discovery Projects (DP).

        Selected publications

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        Book Chapters

        • Marks, B., Einav, I. (2017). Material Point Method Modelling of Landslides with Coupled Segregation. In Papamichos E., Papanastasiou P., Pasternak E., Dyskin A. (Eds.), Bifurcation and Degradation of Geomaterials with Engineering Applications: Proceedings of the 11th International Workshop on Bifurcation and Degradation in Geomaterials, dedicated to Hans Muhlhaus, Limassol, Cyprus, 21-25 May 2017, (pp. 213-218). Cham: Springer. [More Information]
        • Marks, B., Einav, I. (2015). Grainsize Evolution in Open Systems. In Kam-Tim Chau, Jidong Zhao (Eds.), Bifurcation and Degradation of Geomaterials in the New Millennium: Proceedings of the 10th International Workshop on Bifurcation and Degradation in Geomaterials, (pp. 33-38). Cham: Springer. [More Information]
        • Marks, B., Einav, I., Rognon, P. (2011). Polydisperse segregation down inclines: towards degradation models of granular avalanches. In Stephane Bonelli, Cristian Dascalu and Francois Nicot (Eds.), Advances in Bifurcation and Degradation in Geomaterials, (pp. 145-151). New York: Springer Science+Business Media. [More Information]

        Journals

        • Marks, B., Einav, I. (2017). A heterarchical multiscale model for granular materials with evolving grainsize distribution. Granular Matter, 19(3), 1-15. [More Information]
        • Guillard, F., Marks, B., Einav, I. (2017). Dynamic X-ray radiography reveals particle size and shape orientation fields during granular flow. Scientific Reports, 7, 1-11. [More Information]
        • Marks, B., Eriksen, J., Dumazer, G., Sandnes, B., Maloy, K. (2017). Size segregation of intruders in perpetual granular avalanches. Journal of Fluid Mechanics, 825, 502-514. [More Information]
        • Wyburn, E., Guillard, F., Marks, B., Einav, I. (2017). The behaviour of free-flowing granular intruders. EPJ Web of Conferences, 140, 1-4. [More Information]
        • Marks, B., Einav, I. (2015). A mixture of crushing and segregation: The complexity of grainsize in natural granular flows. Geophysical Research Letters, 42(2), 274-281. [More Information]
        • Eriksen, J., Marks, B., Sandnes, B., Toussaint, R. (2015). Bubbles breaking the wall: Two-dimensional stress and stability analysis. Physical Review E, 91(5), 052204-1-052204-10. [More Information]
        • Marks, B., Sandnes, B., Dumazer, G., Eriksen, J., Maloy, K. (2015). Compaction of granular material inside confined geometries. Frontiers in Physics, 3, 41:1-41:9. [More Information]
        • Marks, B., Rognon, P., Einav, I. (2012). Grainsize dynamics of polydisperse granular segregation down inclined planes. Journal of Fluid Mechanics, 690, 499-511. [More Information]
        • Marks, B., Einav, I. (2011). A cellular automaton for segregation during granular avalanches. Granular Matter, 13(3), 211-214. [More Information]
        • Steel, M., Marks, B., Rahmani, A. (2010). Properties of sub-diffraction limited focusing by optical phase conjugation. Optics Express, 18(2), 1487-1500. [More Information]

        Conferences

        • Liu, S., Guillard, F., Marks, B., Rognon, P., Einav, I. (2017). Experimental study of shear rate dependence in perpetually sheared granular matter. Powders and Grains 2017 - 8th International Conference on Micromechanics on Granular Media, Les Ulis, France: EDP Sciences. [More Information]
        • Marks, B., Guillard, F., Einav, I. (2016). High speed X-ray imaging of particulate flows. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.
        • Wyburn, E., Marks, B., Guillard, F., Rognon, P., Einav, I. (2016). Particle shape effects on flowability of powder mixtures. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.
        • Guillard, F., Marks, B., Einav, I. (2016). Velocity measurement of granular flows using dynamic X-ray radiography. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.
        • Marks, B., Valaulta, A., Puzrin, A., Einav, I. (2013). Design of protection structures: The role of the grainsize distribution. 7th International Conference on Micromechanics of Granular Media: Powders and Grains 2013, Melville, New York, USA: American Institute of Physics (AIP). [More Information]

        2017

        • Marks, B., Einav, I. (2017). A heterarchical multiscale model for granular materials with evolving grainsize distribution. Granular Matter, 19(3), 1-15. [More Information]
        • Guillard, F., Marks, B., Einav, I. (2017). Dynamic X-ray radiography reveals particle size and shape orientation fields during granular flow. Scientific Reports, 7, 1-11. [More Information]
        • Liu, S., Guillard, F., Marks, B., Rognon, P., Einav, I. (2017). Experimental study of shear rate dependence in perpetually sheared granular matter. Powders and Grains 2017 - 8th International Conference on Micromechanics on Granular Media, Les Ulis, France: EDP Sciences. [More Information]
        • Marks, B., Einav, I. (2017). Material Point Method Modelling of Landslides with Coupled Segregation. In Papamichos E., Papanastasiou P., Pasternak E., Dyskin A. (Eds.), Bifurcation and Degradation of Geomaterials with Engineering Applications: Proceedings of the 11th International Workshop on Bifurcation and Degradation in Geomaterials, dedicated to Hans Muhlhaus, Limassol, Cyprus, 21-25 May 2017, (pp. 213-218). Cham: Springer. [More Information]
        • Marks, B., Eriksen, J., Dumazer, G., Sandnes, B., Maloy, K. (2017). Size segregation of intruders in perpetual granular avalanches. Journal of Fluid Mechanics, 825, 502-514. [More Information]
        • Wyburn, E., Guillard, F., Marks, B., Einav, I. (2017). The behaviour of free-flowing granular intruders. EPJ Web of Conferences, 140, 1-4. [More Information]

        2016

        • Marks, B., Guillard, F., Einav, I. (2016). High speed X-ray imaging of particulate flows. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.
        • Wyburn, E., Marks, B., Guillard, F., Rognon, P., Einav, I. (2016). Particle shape effects on flowability of powder mixtures. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.
        • Guillard, F., Marks, B., Einav, I. (2016). Velocity measurement of granular flows using dynamic X-ray radiography. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.

        2015

        • Marks, B., Einav, I. (2015). A mixture of crushing and segregation: The complexity of grainsize in natural granular flows. Geophysical Research Letters, 42(2), 274-281. [More Information]
        • Eriksen, J., Marks, B., Sandnes, B., Toussaint, R. (2015). Bubbles breaking the wall: Two-dimensional stress and stability analysis. Physical Review E, 91(5), 052204-1-052204-10. [More Information]
        • Marks, B., Sandnes, B., Dumazer, G., Eriksen, J., Maloy, K. (2015). Compaction of granular material inside confined geometries. Frontiers in Physics, 3, 41:1-41:9. [More Information]
        • Marks, B., Einav, I. (2015). Grainsize Evolution in Open Systems. In Kam-Tim Chau, Jidong Zhao (Eds.), Bifurcation and Degradation of Geomaterials in the New Millennium: Proceedings of the 10th International Workshop on Bifurcation and Degradation in Geomaterials, (pp. 33-38). Cham: Springer. [More Information]

        2013

        • Marks, B., Valaulta, A., Puzrin, A., Einav, I. (2013). Design of protection structures: The role of the grainsize distribution. 7th International Conference on Micromechanics of Granular Media: Powders and Grains 2013, Melville, New York, USA: American Institute of Physics (AIP). [More Information]

        2012

        • Marks, B., Rognon, P., Einav, I. (2012). Grainsize dynamics of polydisperse granular segregation down inclined planes. Journal of Fluid Mechanics, 690, 499-511. [More Information]

        2011

        • Marks, B., Einav, I. (2011). A cellular automaton for segregation during granular avalanches. Granular Matter, 13(3), 211-214. [More Information]
        • Marks, B., Einav, I., Rognon, P. (2011). Polydisperse segregation down inclines: towards degradation models of granular avalanches. In Stephane Bonelli, Cristian Dascalu and Francois Nicot (Eds.), Advances in Bifurcation and Degradation in Geomaterials, (pp. 145-151). New York: Springer Science+Business Media. [More Information]

        2010

        • Steel, M., Marks, B., Rahmani, A. (2010). Properties of sub-diffraction limited focusing by optical phase conjugation. Optics Express, 18(2), 1487-1500. [More Information]

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