ENTRY STABILITY IN STEEPLY INCLINED THICK COAL SEAM AT UNDERGROUND HYDRAULIC MINING

Main objective of the executed researches was justification of the location of entry providing its maintenance in a bearing pressure zone. Researches were carried out for conditions of the Prokopyevsk and Kiselevsky field of the Kuznetsk coal basin (Russia). Researches were conducted by a finite element method. When performing researches the provision entry relative of a regional part of the massif and property of coal changed. As a result of researches influence of strength of coal and the location of entry on the stress and strain state of the massif is established and the conclusion is drawn on need of increase in height of a slice up to 10 m. Recommendations of increase in height of each subsequent slice at mining of soft coals are also made. The novelty of work consists in establishment of dependences of the stress and strain state of the massif on height of the mining slice.