Objectif Increasing mining depth and concentration of coal faces are leading to a rise in rock stresses. Under certain geological and geometrical conditions these can lead to rockbursts. Rockburst hazards thus remain a major problem in hard coal mining.The only stress-relieving method approved so far - stress-relief drilling - is fraught with considerable technical drawbacks:- it is difficult to integrate into mining operations, particularly in faces with high stresses and in thin seams.- the time and effort is considerable, both for transport and setup of the drilling unit and for drilling itself.- an uneven loss of strength in the solid face can lead to deteriorations in the roof.- fine drill cuttings increase the fire hazard from spontaneous combustion.These drawbacks do not arise to the same extent in shot-firing and this method is thus to be developed in this project to ensure that stress can be relieved in safety.The project is to comprise the following work packages.Work package 1: Drawing up a measurement programmeWork package 2: Destressing shot-firing with measurement of the resultsWork package 3: Analysis and improvement of the methodWork package 4: Preparing operating instructions. Programme(s) ECSC-WORKSAFE C - First joint research programme (ECSC) "Safety in the European Coal and Steel Community industries", 1989-1993 Thème(s) 2 - Specific safety requirements of mines Appel à propositions Data not available Régime de financement Data not available Coordinateur RUHRKOHLE NIEDERRHEIN AG Contribution de l’UE Aucune donnée Adresse Shamrocking, 1 44623 Herne Allemagne Voir sur la carte Coût total Aucune donnée
