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 stop es 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 stop es 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 sub(x) < width of work face L sub(0); (2) Stable stage: i.e. the distance work face has advanced L sub(x) > width of work face L sub(0). These research results provide a basis for reasonable determination of a space-time relationship for the mining process.Original Abstract: Velike pogibeljne nesrece u ugljenokopima u osnovi se pripisuju nedovoljnom razumijevanju ili propustu stvaranja potpunog prostornog strukturnog mehanickog modela iskopa tijekom eksploatacije kao i prostornom gibanju do kojeg je tijekom vremena doslo zbog samog iskapanje, iskapanja u krivo vrijeme, kao i neodgovarajuceg odrzavanja kolnika i pomicanja radne povrsine. U svrhu ucinkovitog proucavanja i analize mehanizma zbog kojeg dolazi do velikih nesreca, primijenjena je metoda zasnovana na pracenju naprezanja i pomicanja iskopa da bi se izveo postupak koji dovodi do loma gornjih slojeva, te je dalje predlozena metoda utvrdivanja stabilnosti iskopa na temelju kvalitativne identifikacije dinamike. Proucavanjem se ustanovilo da se stabilnost iskopa tijekom vadenja rude moze podijeliti u dvije faze: (1) nesigurna faza t.j. udaljenost za koju je radna povrsina pomaknuta L sub(x) < sirine radne povrsine L sub(0), (2) sigurna faza t.j. udaljenost za koju je radna povrsina pomaknuta L sub(x) > sirine radne povrsine L sub(0). Ti rezultati istrazivanja cine osnovu za razumno odredivanje odnosa prostor-vrij eme u postupku rudarenja.