METHOD OF DRIVING DOG HEADINGS IN THICK COAL BEDS OF HIGH CRUMP HAZARD

摘要

A driving method for corridor headings, in particular for thick black coal beds f high crump hazard, whereas the strain status of the solid rock is metered on regular basis, and in that solid rock, holes in the floor are enlarged, characterized in that during the operating pause, preferably after moving the machines back, preferably after moving the cutting machine from the coal face, two metering openings are drilled in the floor located preferably along perpendicular line to the coal face and then anchors with geophones are installed in those openings apertures, the speed of a transverse wave is metered, and after a significant transverse wave speed within 1150-1350 m/s was found, apertures are drilled in the floor, preferably up to 100 mm diameter, preferably along parallel lines to the coal face, in distances of 1.2-2.0 times the machine web, and after a significant rockmass stress was found between the lines of enlarged apertures of up to 100 mm diameter, watering apertures are drilled of up to 50 mm diameter located preferably along parallel lines in relation to the coal face, and then, those 50 mm apertures are filled with water under pressure of up to 190 atmospheres or more, in most cases till a noticeable pressure drop or until water is visible inside the 100 mm apertures, and then speed of the transverse wave is measured in the solid coal within the floor.IMAGE