We are pleased to present to you the current edition of the English Journal GeoResources.
A Word on ...
Even after the cessation of hard coal mining in late 2018, Germany remains a raw materials producer, where lignite, potash and salt, ceramic resources, industrial minerals, mineral oil and natural gas are mined. The knowledge acquired from German mining can also be exploited to overcome global raw materials issues.
Frank Heimbecher and Lukas Tophoff
Gabion structures are increasingly being used in the transport infrastructure. Especially internal stability and connectors have to be verified by means of system tests simply because no generally valid models are yet available. This article is dealing with the relevant codes of practice currently available and findings derived from tests on internal stability and connectors relating to back-anchoring with geogrids.
Francesco Masola, Giulia Lugli and Michael Arndt
The architects of Bridge “Brug van den Azijn” (Vinegar Bridge) in Antwerp, Belgium, designed a challenging facade. Maccaferri had to adapt the Mechanically Stabilized Earth (MSE) wall system “MacRes System” to meet the challenging requirements.
Leaky segment joints can be resealed efficiently directly through the joint by means of an injection drill needle. This article explains the innovative, cost-saving “keyhole technology”.
An open-type, Main Beam TBM manufactured by The Robbins Company is excavating the challenging 2.8 km long drive of the Galerie des Janots in France to improve water supply. The contractor Eiffage Civile engineering and the TBM have to overcome caverns and other challenges.
Frank von Havranek
Pipe umbrellas have proved their worth in tunnelling for temporary supporting during driving – especially in the critical area involving the advancing wall and working face in the case of rocks with low cohesion, shallow overburdens, tunnel entrances and fault zones. Composite pile roofs made of steel supporting members with small cross-sections and dynamic grouting offer an alternative to conventional pipe umbrellas. The bearing behaviour and the execution of composite pile roofs as well as pros and cons vis-à-vis conventional pipe umbrellas are examined and unclarities discussed.
Tunnelling and Product News
When excavations are held up, segments can be subjected to the elements for excessively long periods prior to being installed in the tunnel. A new weather-resistant load distribution plate is intended to prevent damage quite apart from making assembly more efficient and secure catering for more straightforward logistics.
Geotechnics and Mining
Large Scale Monitoring using Brillouin Optical Fibre Sensor Systems in the Fields of Geotechnics and Mining
Stephan Großwig, Jürgen Glötzl, Maria-Barbara Schaller and Ulrich Weber
The potential of advanced fibre optical Brillouin Distributed Strain and Temperature Sensor (DSTS) based systems for both safety monitoring of infrastructure as well as early visualization of man-made geological hazards such as occur at all historical mining areas has been demonstrated in various projects.
EU “Blue Mining” Project – Building a large-scale Test System and Flow Tests for vertical Transport Systems in Deep Sea Mining
Toni Müller, Jort van Vijk and Helmut Mischo
An important goal of the European “Blue Mining” research project was to further develop vertical transport systems for deep sea mining. Findings from case studies, modelling and investigations on lab scale had to be validated under realistic conditions. Towards this end, the TU Bergakademie in conjunction with the IHC MTI B. V., Delft, Netherlands developed a large-scale test system in an abandoned mine shaft and conducted an initial series of flow tests for the vertical transportation of solids/water mixtures. This article deals with the planning, building and trials with the large-scale system, the execution of the tests as well as initial results.
The Stone Age has a Future – with this slogan, the quarry company SVA on the Swabian Alb is promoting an industry that is currently booming – not simply because there are so many ongoing road construction projects in Germany. For the project to run smoothly, it relies on its production equipment always being operational, and in turn on its automated lubrication. Bielomatik’s retrofit pilot project demonstrates how all this works.
Mining, Tunnelling and Geotechnics
In North Yorkshire a deep underground mine ist being constructed by Sirius Minerals Plc. The mine will extract polyhalite, a high-quality organic fertiliser. All mining and transportion operations will take place underground. The main focus of this article are the service, production and tunnelling shafts.