Abstract
The article is devoted to determination of roof bolt parameters in coal mine excavations when there is rather high tectonic stress. The work was complicated by the presence of considerable number of fractures in the adjacent rock of seam V-12 in “Severnaya” mine (JSC “Urgalugol”) as well as variable stress field, low roof rock strength and heterogeneity, considerable rock shift during excavations development and maintenance. The article presents the results of horizontal and vertical stress measurements in the rock mass, physical and mechanical properties, roof rock structure and fracturing. According to the results of boreholes study by means of borehole endoscope the authors fully confirmed the forecasted parameters of areas with roof rock discontinuity, the boundaries of unstable rock. The article presents the measurement results of roof rock shift during development face advance. Based on the research, recommendations on excavations development and proper support using were given under conditions of seam V-12 in “Severnaya” mine (JSC “Urgalugol”).
Highlights
Within last decade mines have begun to use intensive coal mining technology it turned out that current regulatory documents can be poorly adaptive to the new organizational and technical conditions of the working mines, and that due to frequent accidents and downtime in longwalls and development faces does not make it possible to enhance labor efficiency sufficiently and increase coal output using underground mining method [1]
Some companies carry out scientific work aimed at studying mining, geological and technical conditions of intensive mineral resources extraction to gain and generalize practical experience and study results [2,3,4]
The main goal of these companies is to implement the results of their studies in practice in coal mines and classify the guidelines for correction of the current regulatory documents
Summary
Within last decade mines have begun to use intensive coal mining technology it turned out that current regulatory documents can be poorly adaptive to the new organizational and technical conditions of the working mines, and that due to frequent accidents and downtime in longwalls and development faces does not make it possible to enhance labor efficiency sufficiently and increase coal output using underground mining method [1]. Some companies carry out scientific work aimed at studying mining, geological and technical conditions of intensive mineral resources extraction to gain and generalize practical experience and study results [2,3,4]. The main goal of these companies is to implement the results of their studies in practice in coal mines and classify the guidelines for correction of the current regulatory documents. The authors determined the goal and objectives of the study considering the importance of such work at present moment and influence of the factors mentioned above. They developed the sequence of procedures and chose proper methods to carry out an experiment under conditions of “Severnaya” mine (JSC “Urgalugol”)
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