We are pleased to present to you the current edition of the English Journal GeoResources.
The mining industry currently faces a unique set of challenges. The article gives an impression of how automation and integration of information brings significant benefits to master the challenges.
Possibilities for applying Geosynthetics for building new and redeveloping existing Bridge Abutments
Marie-Theresa van Keßel and Hartmut Hangen
The need for traffic arteries to be renewed is considerable at present. This report provides proposals for resolving challenges posed by building new bridges and renovating existing ones through applying geosynthetics. Geosynthetic reinforced supporting structures as well as subsoil improvements and temporary structures using geosynthetics offer economic and logistical advantages for building new bridges and renovating bridge abutments. The report deals with fundamental principles and introduces current examples of application.
Michael Dobie and Paul McCombie
Design methods for reinforced soil structures are normally divided into: external stability (defines structure dimensions) and internal stability (determines reinforcement layout). This paper examines a method of calculation which has been developed for the internal stability check based on a simple twopart wedge mechanism. The wedges are defined by a first plane across the width of the reinforced soil zone, and a second plane upwards through the retained backfill. Reinforcement intersected by the first wedge contributes to the equilibrium of forces. A large family of two-part wedges is defined, and sufficient reinforcement must be provided to ensure that all can achieve equilibrium without overloading the reinforcement. Extensive experience of using this technique indicates that the critical two-part wedge in an efficiently designed structure will normally be defined by a line crossing the reinforced soil zone at about 45°, then extending through the backfill at the Coulomb angle. If seismic inertia forces are added, then the angles of both wedges will become less steep. The two-part wedge mechanism is compared with more comprehensive stability analyses, as well as observed behaviour in shaking table tests on small-scale reinforced soil walls.
Creative geotechnical Solutions for Renovating the Dresden Old Masters Picture Gallery in the Zwinger
Part 3: Extending the Tunnel for an underground Museum Passage
Annett Geppert and Jens Jähnig
Renovating the Old Masters Picture Gallery in the east wing of the Zwinger in Dresden also represents a sophisticated task in geotechnical terms. Part 3 of this report deals with execution of an enlargement and lengthening of a tunnel accomplished by trenchless means. It is intended to serve as an underground museum passage for visitors to the Picture Gallery. Special challenges were presented by the tricky subsurface, conservation, ongoing museum operations and existing pipelines and cables.
Tunnelling – Mining
Andreas Behr and Martin Rauscher
The establishment of tunnel fire services for involvement in tunnels is new. This became necessary as fire brigades in Germany are not appropriately trained and equipped and the members of the force lack the necessary underground experience. As a result, they cannot properly cope with incidents involving fires on tunnel sites. In addition, there is the penetration depth restricted to 200 m from the “smoke limit” based on a directive from the Land of Baden-Württemberg currently under preparation. The establishment of tunnel fire services is following a new but also correct path. This report describes the setting up and organization of such novel tunnel fire brigades, which are based on the concept of the mine fire services that have been successfully established in German mining for decades. An approach by the regional government that merely foresees the setting up of an initial response is examined critically for this would signify a decisive climb-down from the actual situation presented here.
Mining – Product
Mine Safety: Complying with Canada’s New Lower NO2 Limits by Implementing Appropriate Gas Detection Technology
Jason Morton and Christoph Feyerabend
Nitrogen dioxide (NO2) is a highly toxic gas that is generated as a component of diesel engine emissions and as a byproduct of blasting. To support mine safety, there is an emerging global trend to reduce levels of human exposure to NO2 in mining workplaces. This article addresses current NO2 limits in Canada and new legislation designed to protect worker health and improve mine safety. It also explores innovative gas detection technologies that can help mines comply with this new legislation.
Purchasing raw-materials directly from overseas, or purchasing goods with a large imported content, adds an extra dimension to the basket of procurement risks a company must consider ‘Foreign Exchange Risk’. This is that risk of losing money due to adverse movements in exchange rates. This paper examines challenges associated with currency volatility on mine production consumables manufacturing companies and strategies a buyer company can employ over manufacturer in managing the impact of these fluctuations.