RESEARCH ON CONTROL COUNTERMEASURE AND INSTABILITY MECHANISM OF ROADWAY WITH NON-SYMMETRICAL STABILITY BY COAL MINING

摘要

Aiming at supporting difficulties of non-symmetrical stability roadway by disturbed, firstly laboratory experiment was adopted to determine the rock mechanical parameters which would provide physical and mechanical parameters.Secondly numerical simulation was applied for analyzing the rock stability characteristics and evolution rules of non-symmetrical stability roadway, and studying the instability mechanism of non-symmetrical stability roadway.Then the numerical simulation was adopted to analyze the function of high-strengthen partition bolt with wire mesh and anchored cable.Meanwhile the technology of high-strengthen partition bolt with wire mesh and anchored cable was proposed and carried industrial test.The results suggest that non-symmetrical distribution stress which would be leading to non-symmetrical sinking of roof and non-symmetrical displacement of sides is created by coal mining.Rock in deep of sides and roof transforms to plastic and stability is sharp deterioration by strengthen weakening of gob coal side.The rock stability is non-symmetrical direct ratio between gob coal sides with roof.With side deformation increasing, the deformation of roof sharply increases and the rapidly sinking of roof accelerates deformation of sides.Partition supporting parameters are designed for roof and sides for increasing loading capacity of gob coal side, decreasing in effect the failure area of roof and coal side, enhancing the strengthen and anti-deformation ability of roof and sides as the base of roof rock, decreasing effectively the non-symmetrical deformation of roadway.