RESEARCH ON MODELLING OF SPATIAL DYNAMIC STRUCTURAL MECHANICS AND SPATIO-TEMPORAL EVOLUTION OF COAL MINE STOPES

Major hazardous accidents in coal mines are basically attributable to a lack of understanding of or the failure to establish a complete spatial structural mechanical model of the stope during the course of exploitation, as well as of the spatial movement over time caused by the mining itself, mining at the wrong time, as well as improper roadway maintenance and advance of the work face. To efficiently study and analyze the mechanism behind major stope disasters, a method based on monitoring the stress and displacement of stopes was adopted to deduce the process whereby the overlying strata fracture, and a method of ascertaining stope stability based on qualitative identification of the dynamics was further proposed. The study found that the stability of stopes during the process of mining the face can be divided into two stages: (1) Unstable stage: i.e. the distance the work face has advanced L-x < width of work face L-0; (2) Stable stage: i.e. the distance work face has advanced L-x > width of work face L-0. These research results provide a basis for reasonable determination of a space-time relationship for the mining process.