Longwall mining method designed to alleviate the earth...

Details Longwall mining method designed to alleviate the earth... Longwall mining method designed to alleviate the earth...

E - Fixed Constructions

21

C

262/6

E21C 41/00 (2006.01)

Patent

CA 1130823

LONGWALL MINING METHOD DESIGNED TO ALLEVIATE THE EARTH PRESSURE AT THE WORKING FACE Abstract of the Disclosure In order to improve the efficiency of longwall mining while avoiding any danger of face fall, it is proposed to form in the ore bed lying ahead of the working face or the ground over- or underlying the ore bed a tunnel which extends over the whole extent of face width. Such tunnel formation is effective to disperse the stress envelope formed around the face region thereby to reduce the face earth pressure. Further reduction of the earth pressure can be effected as required by injecting high- pressure liquid into the ore bed region lying between the working face and the tunnel.

339914

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