A method for maintaining, in a controlled manner, a top
canopy /
coal-face distance expedient for
rock mechanics, in
longwall mining operations in underground
coal mining, using a face conveyor, at least one extraction
machine, and a hydraulic shield support frame. Inclination sensors are disposed on at least three of the four main components of the shield support frame, including floor skid, gob shield, support connection rods and gob-side area of the top
canopy. An inclination of the top
canopy and floor skid are ascertained via the sensors. From the ascertained inclination data, in a computer, the effects on a top canopy /
coal face distance are determined when changes in an
angle of inclination of the top canopy occur. An automatic adjustment of decisive cycle parameters of the shield support frame are carried out, wherein the
work cycle comprises retraction, advancement and setting processes.