The Mining Initiative on Ground Support Systems and equipment, Phase III – MIGS III: 2016-2018.
The first “MIGS” program was started in 2007, focusing on examining developmental and innovative opportunities in the areas of ground support and equipment, aiming to pursue:
- A rationalized approach to ground support system design and testing;
- A standardization of equipment functionality and productivity improvements;
- Innovative methods of monitoring support systems and interaction with the rock mass;
- Increased ductility in support system capacity for deep mining applications;
- Exchanges of technical and operational information on ground support, equipment and related subjects.
Since 2007; the MIGS followed by the MIGS II consortia has completed 17 Work Packages in total, and held a number of informative workshop sessions with invited experts. The work has been so successful so that the partners decided to continue the program through a third phase, ”MIGS III” for an extended three year period starting in 2016. MIGS III will continue to pursue the main MIGS objectives, focusing on the mining industry’s need for better, safer and more efficient ground support and rock monitoring procedures.
Similar to the previous MIGS phases, on-going work in different projects will be complemented by two workshops per year to discuss the projects results and progress. These meetings are open to all personnel from the consortium member companies and usually hosted by one of the program’s partners to enable one or several site visits to illustrate the challenges/opportunities in the best possible way.
The MIGS III program’s technical leader is Dr Graham Swan while the program director is Mr. Johan Hedlin of RTC. If you are interested in knowing more, or joining the program, please don’t hesitate to contact us. The MIGS III program is open for new partners upon request. If you’d like to learn more about which types of projects that has been run by the earlier program phases, you can download the official MIGS report here.
MIGS III will comprise projects with the following focus:
This study will be identifying all factors that influence the corrosion of rock support systems in an underground mining environment as those from e.g. atmospheric and in-situ rock as well as e.g.: Rock bolt or support member(s), including e.g. steel grade, shape, coatings, grouting, etc. Information about the presence and distributions of these will be obtained from three MIGS consortium member mine sites, including data and sample collection as well as analysis thereof.
A methodology will be proposed to perform a generic detailed risk assessment, together with appropriate laboratory-based test methods applicable to the various ground support system(s) and conditions in the mines under investigation. The methology will be confirmed by validation program will be undertaken. This will then led to a compilation of final recommendations for the optimal choice of support design from a corrosion perspective and a guideline of learnings on the subject of corrosion for the mining industry.
The project is divided into five phases during of which Phase I was executed during MIGS II, 2015.
Phase II – V will be executed during 2016 to 2018.
A variety of mesh liner types are manufactured and supplied to the global mining industry, each offering their respective load-deformation characteristics for any given bolt pattern. The objectives with this project are:
- To discover those mesh testing methods that are currently being used, including the most recent generation that claim to address the ultimate demands that loose loads can place on a bolt/mesh system, together with a summary of results that have been obtained, world-wide;
- To derive what the ultimate support capacity/performance requirements are for any given mesh and bolts support system;
- To develop an objective rationale for a standardized method of mine mesh testing.
Rock bolts are currently specified with respect of their tensile yield/ultimate failure load capacities, steel grade and, in the case of yielding bolts, ultimate failure strain. However, under highly confined hard rock deep mining conditions, shear failure is frequently observed. This suggests that bolts with greater shear capacity may be in order, even though the design requirement(s) needed to specify capacity are not well defined at this time. The study will include a numerical modeling component to define common demands on the shearing capacity of bolts. The primary objective would be to obtain a specification of shear capacity together with a proposal for a standardized testing method.
A feasibility study and a reliability study of a dynamic rock support response model was conducted during MIGS II WP 13, completed in 2014. This was done to establish a suitable method to define support effectiveness. This work-package aims to use the results from WP 13, combining these with results from instrumentation and data collection has partly been made possible through a project conducted within the frames of the Strategic Innovation Program for the Swedish Mining and Metal Producing Industry (Gruv och Metallutvinning), a joint program by VINNOVA, Formas and the Swedish Energy Agency, work which is led by Luleå University of Technology. to calibrate the model and implement the results in two steps:
This stage will calibrate the numerical model quantitatively, starting by using data from one of the mines in the MIGS III consortium. Included in this part is also critical parameter sensitivity studies.
This stage will focus on implementing the results. The ideas developed in WP13 and WP21 Stage 1 will be implemented to
- achieve a better design; a rock-burst “resistant” support systems and
- establish an objective methodology in burst-prone mines of assessing a true scale of support effectiveness.
This work package aims to benchmark Screen Type, Handling & Mechanization thereof.
The project idea is to document applications and establish the technical and commercial potential with MWD technique for the mining industry. Further, to determine if and how MWD data can be used to describe important rock mass properties, relevant for improving bolting and bolt installation quality.
The long term goals are to provide data for later following up on the installation (rock) quality for the geotechnical engineers and to provide on-line information to operator for more efficient bolt installation improving the overall reinforcement quality.