Title: Thick alluvium full-mechanized caving mining with large mining height face roof control mechanism and practice
Abstract: The average thickness of the overlying bedrock of Longgu primary mineable coalseam is less than 200 m,but there is a thick alluvium averaging above 700 m above the bedrock.The bearing characteristic of fully mechanized longwallcaving face with large mining height on the condition of unloading,the possibility of step sinking and its critical thickness are analyzed in order to solvethe problems of the mine pressure atmining face and strata control underthick alluvium condition.The results show that,whileits bearing capacity is not strong after large excavation underthe bottom of deep alluvium and itsweight is loaded onthe underlying bedrock,the fracture zone can form a stable mechanical bearing structurewhen the thickness of the bedrock is more than 120 m,so the coalface roof canbe controlled.On this basis,ZF15000/23/43 hydraulic support has been developed,with the largest working resistance in China.With this hydraulic support,the surrounding rock in fully mechanized caving coalface with large mining height underthick alluvium can becontrolled.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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Cited By Count: 7
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