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Open Access Characteristic of mining stress evolution and activation of the reverse fault below the hard-thick strata

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There will be changes in roof movement and mining stress after overlying hard-thick strata cut by reverse fault.By using three-dimensional numerical calculation method,this paper analyzed the characteristics of mining stress evolution,roof movement and fault activation rule,and also used the engineering example to verify it.Study results show that under the effect of reverse fault cutting,the surrounding rock of hanging wall working face appears as inverted wedge,the mining stress transfers to deep below the floor and high above the roof,and the surrounding rock stress concentration is greater than that at lower face.Compared with the hanging wall working face,the mining stress of footwall working face is greatly influenced by the distance between working face and fault.The magmata rock and its lower strata form the structure similar to ‘leverage’,which causes the subsidence and rebound of coal seam roof.The possibility of immediate roof fault zone activation of reverse fault at footwall working face is greater than that at hanging wall working face,while the possibility of the high position magmata fault zone activation is less than that at footwall working face.The fault starts the activation when the distance between footwall working face and reverse fault is 40 m.When the distance between hanging wall working face and reverse fault is 40m,the immediate roof fault zone start activation,while the high magmata rock fault zone starts activation when the distance is 30 m.
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Keywords: fault activation; mining stress distribution; reverse fault; roof movement; super-thick magmata rock

Document Type: Research Article

Publication date: February 15, 2015

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