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Dear clients,

Over the last two decades, Itasca has trained thousands of scientists and engineers in the use of its products. As Itasca's software products have grown in features and versatility, so has Itasca's commitment to provide the highest level of software training.
From now on, Itasca offers many free webinars dedicated to our codes on Itasca YouTube Channel. We hope that this helps our users in the building of models.

The European Itasca team

puce Consulting

Itasca Consultants AB (Sweden) carried out FLAC3D modeling to analyze seismically active volumes of LKAB's Kiirunavaara Mine. The results were used to evaluate expected changes in seismically active volumes with planned production. The selected modelling strategies, evaluation of crack initiation via differential stress and plastic failure, and slip on pre-existing discontinuities, was successful in deepening the understanding of seismic behaviour at the Kiirunavaara Mine. Hangingwall seismicity was correlated with the location of plastic failure in the models, as well as differential stress near the production front. Footwall seismicity showed less clear relation with model results, however, many orientations of discontinues have the possibility to slip, and therefore may contribute to seismicity. Patterns in orientations of discontinuities that can slip were consistent in the footwall drifts relative to the active production level, regardless of the depth of production evaluated. Large changes in the general patterns of seismicity are, in general, not expected as production continues. This work will be presented at the upcoming 3rd Nordic Rock Mechanics Symposium, in Helsinki, Oct 11–12, 2017.

fig1

Figure 1 The 3-D numerical stress analysis model.

fig2

Figure 2 Example of seismic events in the hangingwall and plastic failure, Y33 at the end of 2014. Levels shown for reference.

 

 

Itasca Consultores S.L. has been asked to construct a 3D model of the foundation of a wind turbine to analyze the deformations and stresses obtained due to static and seismic loads acting on it. The analysis has been performed using FLAC3D.

The model reproduces the octagonal concrete footing with a maximum width of 16 m, the ground and filling around, the concrete slab below the footing, the load transfer platform and the rigid inclusions (modelled as pile elements). Different load hypothesis has been applied acting on the footing, due to static and seismic effects, as a combination of vertical and horizontal forces and moments. Along with the combination of loads, different properties of the surrounding soil were considered, as the effect of the collapse of the soil just below the footing has already been taking into account.

Using the combination of the different effects (loads and collapse of the soil) we obtained the settlements, stresses and forces in the piles and the footing in order to calculate the maximum reinforcement needed in the structures against failure.

 

fig1

Figure 1. 3D model. Footing and piles.

fig2

Figure 2. Loads applied in the footing. Seismic hypothesis

 

fig3Figure 3. Final deformations in piles and footing.

 

fig4

Figure 4. Distribution of axial forces (in N) in the piles

 

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arrow Training & Seminars

For users who envisage the need for substantial amounts of assistance, consulting support or customized training course are available.
Feel free to contact us if you have specific needs: we adapt our offer to your needs.

arrow Conferences

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

Conference
Date
Place
3rd Nordic Rock Mechanics Symposium, NRMS 2017 October 11-12, 2017 Helsinki, Finland
SNAME October 11-12, 2017 Athens, Greece
3rd Hellenic Conference on Dams & Reservoirs October 12-14, 2017 Aegli Zappiou, Greece
3rd International Soil-Structure Interaction Symposium October 18-20, 2017 Izmir, Turkey
AFTES 2017 November 13-15, 2017 Paris, France
Congress International AFTES Paris 2017 "The value is underground" November 13-16, 2017 Paris, France
7th Geotechnical Symposium November 22-24, 2017 Istanbul, Turkey
AGU December 11-15, 2017 Seattle, USA

Slope Stability 2018
Jonny Sjöberg appointed Keynote Speaker

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

arrow Recent Publications

Lope Álvarez, U. Lindfors, F. Perman, F. Johansson & B. Stille (2017) "Regional-scale numerical stress model of the Stockholm area" In: Proceedings of the World Tunnel Congress 2017 – Surface challenges – Underground solutions. Bergen, Norway, June 2017.

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 

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France

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