Application of highwall mining system in Hongshaquan Open-pit Mine
In order to improve the recovery efficiency of coal resources at the end slope of Hongshaquan Open-pit Mine,reduce the waste of coal under the end slope,we took the west end wall of the first mining area in Hongshaquan Open-pit Mine as the research object,and studied the width of supporting coal pillar and isolating coal pillar,and the slope stability of the west end slope under natural working conditions and the condition of the end shearer with coal pillar,combining with the principle of the highwall mining system.The results show that the calculated width of supporting coal pillar and isolating coal pillar is 5.5 m and 27.3 m,respectively,according to the formula given by Mark-Bieniawsk.The stability coefficient of the west end slope is 1.957 under natural working conditions,and 1.805 after excavation with the highwall mining system,both of which meet the requirements of the open-pit mine design specification.Hongshaquan Open-pit Mine has the conditions to use the highwall mining system,which can solve the problem of coal mining under end slope.
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