Dear clients,

Employees from the Itasca offices and their representatives are scheduled to present, attend, or exhibit at numerous conferences in the upcoming quarter. To ensure you the best reception and to present jointly their expertises and products, we will be hosting you on our booths or over a drink. Please consider attending the confenreces listed below or visiting us at one of them. We're always looking for good people and challenging projects.

The European Itasca team

puce Consulting

Mechanical testing of a model baked anode material with PFC

A baked anode is a complex material, that results from the mixing and baking of different petrol coke grains, with different size distributions, with a pitch. A preliminary study (ICSAS16-CST-MFG-35143-01) developed a PFC2D model accounting for the microstructure of a baked anode, using the Bonded Particle Model (BPM). The new goals are to: 1) improve the geometrical description of the baked anode material, and 2) setup procedures simplifying the application of a mechanical load on the model material, and comparing its mechanical response with experimental data.

Itasca Consultants S.A.S. had to improve the previously developed PFC2D environment by integrating more realistic size distributions of the grains, pore content, and binder distribution, as well as “open porosity”. Implement shape factor measurements (aspect ratio, sphericity, roundness, convexity, compactness) on the reconstructed particles and compare results with real structure. Calibrate intact BPM matrix then setup an axial loading test of a disk-shaped specimen with a pre-engineered notch (see figure). Characterize the repeatability of the measurements and the influence of specimen size. Study the influence of a notch, of the Young modulus, and of the binder strength.

Post-peak failure patterns

A parameterized environment is available, that simulates the mechanical loading of a disk-shaped specimen with a preengineered notch. The geometrical description of the material now includes ”real” grain size distributions, new volume fractions for grains and pores, and “open porosity”. Use of this model confirms that the elastic slope, crack pattern and peak force are highly dependant on the geometrical repartition and on the distribution of voids and pores, while the specimen size has a strong influence on the linear slope and on the peak force.


A Constitutive Model describing the Material Behavior of Salt Dumps

ITASCA Consultants GmbH has developed a constitutive model describing the stress-strain and creep behavior of salt dumps in FLAC3D and FLAC. Three different processes dominate the real material behavior. The first process is compaction and decreasing pore space due to the weight of the crushed salt. The second process is creep behavior because the principal material of the dump is residual salt. With higher compaction, strength parameter increases. This means that as third process shear- and tension-failure may occur. The ITASCAsaltdump model was developed based on CWIPP and Strain-Hardening/Softening Model. The basic functionality was investigated by simulation of creep and compaction-tests. The figure shows the compaction ratio of a salt dump after 8 years and third filling. The compaction ratio increases to one with the age of the filling and the extent of the overburden. Also this ratio is affected by local failure.


Compaction ratio after 8 years

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arrow Training & Seminars

Itasca will host introductory training courses in Europe:

Microseismic Processing and Interpretation Training Course Shrewsburry, UK June 26-28, 2017 Itasca UK

Please visit for full details.

For users who envisage the need for substantial amounts of assistance, consulting support or customized training course are available.
Accordingly, users are encouraged to submit sample problems prior to the training session for our review and preparation. These problems would then be used as practical applications of the code during the training sessions.

arrow Conferences

Itasca and/or representatives will be attending the following conferences:

BCRRA 2017 June 28-30, 2017 Athens, Greece
Powders & Grains 2017 July 3-7, 2017 Montpellier, France
DGGT Fachsektionstage September 6-8, 2017 Würsburg, Germany
10th International Symposium on the Conservation of Monuments in the Mediterranean Basin (MONUBASIN) September 20-22, 2017 Athens, Greece
Workshop "Numerische Methoden in der Geotechnik" September 27-28, 2017 Hamburg-Harburg, Germany
3rd Nordic Rock Mechanics Symposium, NRMS 2017 October 11-12, 2017 Helsinki, Finland
SNAME October 11-12, 2017 Athens, Greece
3rd International Soil-Structure Interaction Symposium October 18-20, 2017 Izmir, Turkey
Congress International AFTES Paris 2017 "The value is underground" November 13-16, 2017 Paris, France
7th Geotechnical Symposium November 22-24, 2017 Istanbul, Turkey

Slope Stability 2018
Jonny Sjöberg appointed Keynote Speaker

April 11-13, 2018 Seville, Spain
Eathquake Thessaloniki Engineering June 18-21, 2018 Thessaloniki, Greece

arrow Recent Publications

Akinshin, I.; Missal, C.; te Kamp, L.: Simulation of Pressure and Time-Dependent Behavior of Backfill Material in Numerical Calculations – Simulation des druck- und zeitabhängigen Verhaltens von Versatzmaterial bei numerischen Berechnungen. In: Mining Report – Glückauf, Volume 153, Issue 2, p. 166-172. Bergbau-Verwaltungsgesllschaft mbH, Herne, 2017.

Changping, Y., J. Sjöberg & D. Johansson - (2017) "Numerical modelling for blast-induced fragmentation in sublevel caving mines". Tunnelling and Underground Space Technology, 68, September 2017, pp. 167–173Paper available on-line 

Umar, S.B., J. Sjöberg & T. Savilahti - (2017) "Modelling of caving and deformation mechanisms of the hangingwall of the Printzsköld oreboby at Malmberget mine." The Journal of the Southern African Institute of Mining and Metallurgy, Volume 117, April 2017, pp. 351–360Paper available on-line 

Sjöberg, J., F. Perman, D. Lope Álvarez, B-M. Stöckel, K. Mäkitaavola, E. Storvall & T. Lavoie – (2017) "Deep sublevel cave mining and surface influence" In: Deep Mining 2017 (Perth, March 28-30, 2017)Paper available on-line 

Vatcher, J., S. D. McKinnon & J. Sjöberg – (2017) "Geomechanical characteristics inferred from mine-scale rock mass behaviour" In: Deep Mining 2017 (Perth, March 28-30, 2017) Paper available on-line 

Lindfors, U., D. Lope Álvarez, F. Perman, F. Johansson and B. Stille (2017) "Spänningsmodellering av storskaliga strukturer i Stockholmsområdet, in: Bergmekanikdag 2017 – Föredrag (Stockholm, March 13, 2017), pp. 81–91, Stockholm: Stiftelsen Bergteknisk Forskning — BeFo (in Swedish), 2017 (in Swedish).

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