METHOD FOR MASSIF FACE ZONE CONDITION TREATMENT Russian patent published in 2007 - IPC E21F5/00 

FIELD: mining, particularly highly-explosive coal bed development.

SUBSTANCE: method involves drilling inspection hole in enclosing rock so that the inspection hole is spaced 5-15 m from coal bed and has depth equal to 0.4-0.6 depth of advance holes; installing vibration sensor in inspection hole; monitoring acoustic coal bed emission caused by each advancing hole drilling; recording emission in two energy classes 4-6 times differing one from another during each next advance hole drilling; estimating discharge zone depth from ratio of number of acoustic emission pulses of each energy class determined for each advance hole interval depth; determining maximal possible cut length in next mining cycle from reduction of number of acoustic emission pulse ratio up to values recorded at the beginning of hole drilled in previously unloaded zone, wherein after next advance hole drilling termination acoustic emission pulse generation process attenuation is expected, said pulse generation attenuation is caused by disturbance made by said hole in massif; controlling advance hole wall closing by means of probe; calculating hole influence diameter from mathematical formula as advance hole wall is closed.

EFFECT: increased accuracy of discharge zone determination and influence zone for each separate hole, as well as increased mining safety.

1 dwg, 1 tbl