Analysis on the Formation Mechanism of Water and Gangue Collapse Accidents in Tenglong Coal Mine in Guizhou Province
10903 working face of Tenglong coal mine experienced a water and gangue collapse accident caused by abscission layer layer water.The accident category was determined based on the accident site,water inflow situation,collapse materials,and support changes.To study the formation mechanism of water and gangue collapse,the geological conditions for the development of abscission layer layer water in the working face were elucidated by analyzing the geological structure and aquifer characteristics of the roof of the working face;Based on the simulation test of the composition and separation of the overlying rock in the mining area,it is pointed out that the Changxing Formation limestone in the upper part of the coal seam is a sub key layer controlling the formation of abscission layer space in the overlying rock,and the Changxing limestone water is the main source of supply for abscission layer water.Analysis and research were conducted on the development of the frontal structure of the working face,mining,and changes in roof support before the accident occurred.It was pointed out that the development of detachment water,fault failure,and support defects led to the front cutting of the fractured rock frame of the roof,resulting in water and gangue collapse.
prevention and control of coal mine waterwater and gangue collapseaccident Analysisabscission layer water
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