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Struzina M.,Mitteldeutsche Braunkohlengesellschaft MbH MIBRAG | Muller M.,Hydrocomputing UG haftungsbeschrankt and Co KG | Drebenstedt C.,TU Bergakademie Freiberg | Mansel H.,Ingenieurburo fur Grundwasser GmbH IBGW | Jolas P.,Mitteldeutsche Braunkohlengesellschaft MbH MIBRAG
Mine Water and the Environment

Horizontal directional drilling (HDD) can be a cost-effective way to dewater excavations and surface mines. Laboratory and field experiments provided insight into the important processes involved and allow us to reproduce them through modelling. A new algorithm based on the flow equation by Manning-Strickler was developed and introduced into the groundwater model, PCGEOFIM®, which allows one to calculate open channel flow within HDD wells. The experimental and numerical results clearly showed that HDD wells have certain advantages over vertical wells, such as more cost effective dewatering in thin aquifers. Additionally, free flowing HDD wells dewatering technology allow mining to proceed without requiring the removal of the wells. © 2011 Springer-Verlag. Source

Lohstrater O.,Mitteldeutsche Braunkohlengesellschaft MbH MIBRAG | Wunderlich A.,Mitteldeutsche Braunkohlengesellschaft MbH MIBRAG | Ray P.,Mitteldeutsche Braunkohlengesellschaft MbH MIBRAG
World of Mining - Surface and Underground

An assessment of the proficiency of automatically generated breaklines as a data interpretation tool in open-cast mining was performed. The aim of the first stage was to optimize the process of automatic breakline creation through changing the parameters within their ranges to provide consistent, reliable and accurate output results. By converting the grid points into a Digital Terrain Model (DTM) and then analyzing cross-sections, measurement failures of the GPS/GNSS and associated scanner devices could be identified. Various in-house developed filtering methods were tested and optimized to help select any interference in the raw grid-data so that only high-quality data without any interference remained for continued processing. A number of measurement errors in the form of unrealistically high peaks or troughs were identified from analyzing the raw GPS/ GNSS points. Breaklines generated from the production machines yielded a very limited number of breaks (one per km). Breaklines generated from stacker data in combination with a 3D-Scanner were assessed as very good. Source

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