Project Cut Sheets

Project Cut Sheets

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Laver Rock Mechanics Pre-Feasibility Study Itasca Consultants AB

Boliden is investigating the Laver low-grade copper deposit for potential future mining. The old Laver deposit was discovered in the 1930s, and was operated between 1938 and 1946. Mining was primarily conducted as smallscale underground mining, but a small open pit was also in operation at that time. The currently investigated deposit is of larger scale and with lower grades. Investigations have been on-going since 2008, including geophysical investigations, outcrop mapping, sampling of drill cuttings, and diamond core drilling. The mineralization is not defined at depth and/or in strike extension.

The objective of the study was to complement the conceptual rock mechanics study with more data and confirm the findings from that study, as well as increasing the level of detail and reducing the uncertainty in the description of the rock mass to an appropriate level for a pre-feasibility study.

 

Mining 2013


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Guidelines on Design of Rock Excavations Itasca Consultants AB

In 2009, the Swedish National Rail Administration presented a handbook with guidelines for the design of the load-bearing structure of rock tunnels. Following the merging of several transport administrations into The Swedish Transport Administration, an updated version of the handbook was required. In this version, the handbook comprised guidelines for railroad and road tunnels, as well as tunnel portals to: (i) provide advice on how regulations and technical requirements can be met, (ii) present practical guidelines for design work, and (iii) provide support to clients, designers and contractors through the entire planning and implementation process.

Civil 2015


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Rock Mechanics Support for the Dannemora Mine Itasca Consultants AB

The Dannemora mine has been in production since (at least) 1481 until its first closure in 1992. The fact that the mine is very old, but also has been closed for some time, has influenced the infrastructure and mine planning during the earlier era of mining. At the re-start of the mine in 2012, several rock mechanical issues were identified, due to both the complex ore geometries and old mine planning, including: (i) position and stability of old drift ramps, (ii) stability of the existing shafts, (iii) impact on surface from future mining activities, (iv) distance between new and old orebodies and stopes, (v) stability of older, open existing stopes while re-starting mining activities, and (vi) rock stresses.

Mining 2014


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SKB Apsö UFM application Itasca Consultants S.A.S. Power Generation 2016


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Solid segregation of limestone-coal mix discharged on a conoid system Itasca Consultants S.A.S. Manufacturing 2016


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Analyse de la distribution des blocs potentiellement générés lors de la fragmentation d’une roche fracturée Itasca Consultants S.A.S. Mining 2016


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A new loading system to limit segregation of a limestone-coal mix loaded in a cylindrical hopper Itasca Consultants S.A.S. Manufacturing 2016


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Discrete modelling of fibrous structure from 3D tomography images and fiber segmentation process Itasca Consultants S.A.S. Manufacturing 2016


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Interactions entre argilite et revêtement autour d'une alvéole de stockage à long terme Itasca Consultants S.A.S. Civil 2016


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Modélisation de l'excavation de deux galeries Itasca Consultants S.A.S. Civil 2016


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Estimation of Fracture Shear Displacements due to Slot Excavation Itasca Consultants AB

This project comprised three-dimensional discontinuum modeling of the slope excavation at the Äspö HRL, in order to determine the induced joint shear displacements. 

Civil, Power Generation 2015


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Numerical Modeling of Mining Sequences and Seismicity Itasca Consultants AB

Mining-induced seismicity is one of the most serious rock mechanics problems in sublevel caving in the LKAB mine in Kiruna. In this project, alternative mining sequences for a portion of the mine have been simulated using a three-dimensional numerical model. Large-scale geological structures have been explicitly included in the model to simulate the occurrence of "fault slip" type seismic events. Calculations have been conducted using 3DEC.

Mining 2012


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Long Term Cavern Stability of the SFR Facility Itasca Consultants AB

A numerical analysis was conducted to assess the long term stability of the rock caverns BMA and BLA for the final repository of low and middle level nuclear waste at the SFR facility in Forsmark, Sweden. The objective was to analyze if there exists a long term risk for an ongoing loosening of the rock mass up to the surface due to degradation and weathering of the rock mass adjacent to the walls of the rock caverns.

Civil, Power Generation 2012


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3D-Analysis of the Stockholm By-Pass Road Tunnel Itasca Consultants AB

A new motorway west of Stockholm linking the north and south side of Stockholm is under development – the so-called "Stockholm By-Pass" ("Förbifart Stockholm"). The new link is a 21 km long highway, of which 18 km is in tunnels. At the interchange of Lovön, four intake and exhaust air stations are planned, being in close proximity to the main tunnels and ramps. In this area, there is also a deformation zone going through the intake and exhaust air station.

Civil 2014


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Stress Modeling Malmberget Itasca Consultants AB

LKAB plans to increase the production in Malmberget mine to 20 million metric tons of iron ore per year. The objective of this work was to create a detailed model of all orebodies to study the stress situation with continued ore production at depth. Itasca constructed a three-dimensional mine-scale model for the Malmberget mine, including all orebodies (active and previously mined). The model was created in the CAD-program Rhino and using the element generator KUBRIX and analyses were conducted with FLAC3D.

 

Mining 2013


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Norra Länken 3D Stability Analysis Itasca Consultants AB

The Northern Link (Norra Länken) will be part of a major road system surrounding the Stockholm metropolitan area. As part of the design work for this project, Itasca Consultants AB and Itasca Consultants S.A.S. has performed a three-dimensional numerical study to analyze of the effect of a large surface load being applied on top of a tunnel intersection with low (4 m) rock cover. 

Civil 2012


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El Teniente Fragmentation Study Itasca Consultants AB

Fragmentation is an important aspect of all block caving operations. The primary fragmentation can be difficult to assess, in particular in complex geological environments, and for rock masses subjected to varying stress as is normally the case in block caving.

Mining 2013


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Tunneling in Mixed Face Conditions Itasca Consultants AB

Tunneling in mixed face conditions (rock-soil) was studied in a reasearch project for BeFo (Swedish Rock Engineering Research Foundation), with the aim to incrtee the knowledge and better understand deformations mechanisms for tunneling under these conditions. The work comprised a generic sensitivity study and a case study of the tunnel passage under the Maria Magdalena Church in Stockholm, using two- and three-dimensional numerical modeling. 

Civil 2015


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System Design of Underground Facility for Spent Nuclear Fuel Storage Itasca Consultants AB

The design of the final nuclear repository design has been initiated by SKB and as a first step the system design of the underground facility has been executed. Itasca has taken part in the project with responsibility over rock mechanical problems and analyses. The work included support of layout decisions through analyses and rock mechanical expertise. The analyses with FLAC and FLAC3D were mainly focused on the rock stress redistributions around the facility. The work involved finding the amount of tunnels and shafts in different rock domains, as well as necessary rock reinforcements. The system design work also included risk analysis of the project.

Civil, Power Generation 2012


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Improved Blasting through Precise Initiation Itasca Consultants AB

Using blasting caps with electronic delay units, and programmable delay times down to 1 ms, it has become possible to employ wave superposition in rock blasting. It has been hypothesized that fragmentation is improved in areas between blastholes where the tensile waves meet, overlap and interact. An improved fragmentation can, in turn, result in reduced costs for both blasting and transportation of the blasted rock, improved environmental aspects, and reductions in energy consumption during crushing and grinding of the blasted rock, as well as improved metal recovery. In this project, the above hypothesis was further studied in conjunction with developing computational tools for simulation of blasting with electronic programmable delay caps.

Mining 2013


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Extraction of Crown Pillar in Kittilä Itasca Consultants AB

Extraction of the crown pillar separating the open pit from the underground mining was to be conducted as a part of the transition from open pit to underground mining at the Kittilä mine.

Mining 2014


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Ore Pass Design - A Modeling Study Itasca Consultants AB

The LKAB mining company is currently carrying out investigations for a potential continued mining at depth in the Malmberget mine. Part of this work involves design of ore passes. The ore passes are a vital part of the transportation chain, and has, historically, been subject to extensive instabilities leading to closing and re-development of ore passes. The objective of this project was to: (i) validate rock mass strength and stress state, and (ii) determine the optimal orientation and location of ore passes with respect to the effects of wear (geometrical changes) and stress-induced failures in the ore pass walls.

Mining 2015