Bugara M. Geomechanical foundation of optimal technologies for mining of marginal parts of longwall panel in faulted coal seams

Object of research -pillar working-off which adjoin to development drift. The purpose of research -basing of the working-off rational technological schemes of extraction pillar end parts in the strongly broken parts of mine fields. Methods of research - the complex scientific approach with application of the following methods is used: research of displays of rock pressure in in-situ conditions by complex observational stations and hydraulic gauges, computer modeling of pressure distribution in a rock massif, mathematical processing of modeling results and economic analysis of variants. The theoretical results and novelty - are established geomechanical rules of a rock massif stressed state change in vicinities of development working and breakage face at the finish off working of extraction pillar end part; on the basis of active pressure comparison ahead of breakage face with roof rock durability; is established, that the best criterion of roof stability is inherent in variants frontal upon-working of mine excavation by a single longwall with a small withdrawal from face entry and withdrawal of a single longwall of the top seam, in which it makes 2,19 and 1,83 accordingly; complex criterion of rationality application of finish working ways of end parts for the first time is developed, which includes three independent components: stability of a roof, stability of preparing mine working and completeness of a robbing of resources; the feature of a ratio of partial criterion of rationality application of ways to end working of the end parts distinguished by their discrepancy is established. Practical results and the novelty of the dissertation consists in a geomechanical and economic substantiation of rational ways of mine works conduction on the basis of developed partial and complex criteria. The subject and degree of introduction is tested two offered ways on mine "Yugno-Donbasskaya №1". Range of application is intended at mines and R&D institutes of Ministry of Coal Industry and N.A.S. of Ukraine.