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NEWSLETTER In this edition: Blasting close to a substation with a low threshold value A new era of blast initiation systems reducing safety risks, costs and enabling automation Elimination of a drilling machine accident and much more... August 2018 NEWSLETTER August 2018 The President's voice............................................................................................2 Blasting close to a substation with a low threshold value...........................................6 A new era of blast initiation systems reducing safety risks, costs and enabling automation........................................................................................................28 Elimination of a drilling machine incident................................................................43 PECCS III Test Course..........................................................................................51 New members and Upcoming events......................................................................53 We in EFEE hope you will enjoy the present EFEE-Newsletter. The next edition will be published in November 2018. Please feel free to contact the EFEE secretariat or write to [email protected] in case: You have a story you want to bring in the Newsletter You have a future event for the next EFEE Newsletter upcoming events list You want to advertise in an upcoming Newsletter edition or any other matter. Doru Anghelache, Chairman of the Newsletter Committee and the Vice President of EFEE and Teele Tuuna, Editor of EFEE Newsletter - [email protected] *The articles that appear in this newsletter are the sole opinion of the authors. EFEE takes no responsibility for the accuracy or integrity of the content, and persons who rely on the content of articles do so at their own risk. EFEE encourages persons engaging in complex or hazardous activities to seek appropriate professional advice. EFEE SECRETARY GENERAL ROGER HOLMBERG, JÄRNGRUVEVÄGEN 6 618 92 KOLMÅRDEN, SWEDEN [email protected] www.efee.eu Dear EFEE members, The most important assets to secure the President´s voice are often our skills and human resources. Our future working opportunities are dependant not only This is your captain speaking. It is my on economy but also much on the pleasure to welcome all of you EFEE image of our work and industry. Newsletter readers back to blasting Figuratively speaking - let us not business after a long and hot summer design and build bridges that fail, so period. This summer has been the we can keep on building bridges in hottest on the record and rain-free in the future. We should therefore most parts of Europe, as also up maintain and improve our here in Scandinavia, where I reside, professional skills by constant most of the positive weather updates and training. This will help records were beaten this summer. I us develop and hold up the quality hope that your summer included and safety in our demanding and enough vacation time. It is important sometimes risky profession. Our for all of us to reload our batteries success in enhancing the good and to help us through the coming fall safe image of our industry is and the intensifying work period. I essential for keeping our working did so partly by cruising around the opportunities in good shape for the beautiful and unique Finnish future. archipelago. There are many of us in EFEE The economy in Europe is mainly in administration who work hard in order good shape at the moment. Therefore to develop a new shotfirer training people, businesses and governments program under PECCS project. This are not afraid to make required program and all produced training investments and therefore the material from it can be adopted free development in construction and of charge by all European trainers mining business has been positive. after the completion of the project, This means an increasing amount of should they choose to do so. The goal working opportunities and at least a in all this is not only to take the first fraction of wealth to all of us blasting solid steps towards harmonization of engineers and professionals. EU-wide shotfirer training, but perhaps even more to lift the In the heat of economic growth we standards of our industry to a new should remember to also secure our level. This will in turn help our future opportunities as good as we industry improve the safety and can. After all, times will not always be quality in use of explosives. We so positive. Many uncertainties believe this will bring all of us threaten the development of world increased and safer working economy as we speak. We tend to opportunities, should we succeed in forget this while we are busy and this effort. there is less time to worry about tomorrow. NEWSLETTER August 2018 www.efee.eu /[email protected] BACK TO TOP We need your support in this It is your hard and successful work endeavour and I hope that you will that has carried our federation so far give it to us when the time comes. and developed it all the way to its Our intention is to change the training current standards. I wish to express of shotfirers for better and change special gratitude towards our three can be sometimes hard but this time honorary members Mr. Walter it is surely worth all hardships. Werner, Dr. Raimo Vuolio and Mr. Björn Jonsson. All of them have Our next council and board meeting contributed greatly to the birth and will take in Dresden in not so place success of EFEE and the development far future. The 3rd and last PECCS of our industry in general by making it test training will also take place in safer and more professional. For Dresden following our meetings. I example Raimo has written several hope to meet many trainers there in great books on blasting technique and order to hear your opinions on our been a teacher in Technical University achievements so far. of Helsinki during the late 80´s for me and tens of other current Finnish Last but not least, I am honoured to explosives engineers and shotfirers. wish EFEE happy 30th Walter has also engaged his work anniversary!! EFEE was formally much around training and Björn has founded on October 20th 1988 in Aachen Germany. The council will been an important forerunner for our celebrate this in Dresden by a formal industry in Sweden. They have all of dinner following our meetings. I wish course also acted as Presidents in to thank all the numerous people and EFEE on their turn, Walter as the first explosives professionals who have President. Thank you all! worked for EFEE during these three decades. Jari Honkanen, President of EFEE NEWSLETTER August 2018 www.efee.eu /[email protected] BACK TO TOP NEWSLETTER August 2018 www.efee.eu /[email protected] BACK TO TOP Blasting close to a substation with 1. BACKGROUND a low threshold value. Test blasts, vibration prediction and execution Järvastaden AB is establishing of rock excavations residential buildings in Västerjäva, a suburb 12 km north of Stockholm city centre. Approximately 60 000 m3 rock Abstract: must be excavated in order to create the correct level for the buildings. Rock This paper describes a project that was performed in Västerjärva, a suburb of excavations must be made just 50m Stockholm. A low threshold value (2 from a substation (Figure 1.1) east of m/s2) at a nearby electrical substation the area with equipment in form of gas- meant that blasting for new residential filled switchgear and circuit breakers. buildings became a challenging task. The threshold value for blast-vibrations This paper describes how test blasts was set to 2 m/s2 (by the owner of the were performed in the area and how substation) which is very conservative. the data from these test blasts was used to make recommendations During the summer of 2013 a regarding the excavation of the area. It contractor initiated rock excavations, also describes how the excavation was but had to stop working when the performed and discusses how accurate threshold value for blast-vibrations was the predictions made were in relation to exceeded at a distance of nearly 150 the actual result. The analysis included meters from the substation. To be able the charge weight scaling law equation to perform the rock-excavation in the as well as a signature wave area, Järvastaden AB asked Nitro superposition model. This was to be Consult to perform a pre-study of the able to predict, not only, MIC but also area starting with a test blast. During delay time and the influence of blast the autumn 2014 Nitro Consult direction, blast hole screening etc. performed test-blasting in order to investigate different options for performing full scale blasting in the area. Figure 1.1. The Substation NEWSLETTER August 2018 www.efee.eu /[email protected] BACK TO TOP The aim of the test blast was to (Instead of vmax., we can use investigate the options available for acceleration (amax) in the same production blasting but also to equation to predict acceleration investigate how close to the instead of vibration velocity. The A & B substation blasting could be parameters will however be different performed. The test blast was also and not correlated) designed to give recommendations for production planning criteria including; 2.2 The superposition model drill patterns, delay-times including The difference between the maximum instantaneous charge (MIC) superposition model and the way and excavation planning. vibrations traditionally have been calculated (charge weight scaling law 2. METHOD equation) is primarily that the concept of time is introduced into the In principle two different methods were calculations, and in this way it’s used to decide how to excavate the possible to optimize the blast after area. After the test blast the data was considering different initiation plans. analysed using regression analysis and the charge weight scaling law The model uses Monte Carlo equation. To further analyse the data a simulations whereby you include superposition model was used in order variability in governing parameters to make suggestions regarding delay that cannot be exactly determined (due times and geometry of the blasts.