The invention discloses a
system and method for monitoring reserved
coal pillaralong-goaf remained gateway floor crack development. A floor
drill site is dug in one side of a reserved
coal pillaralong-goaf remained gateway, different depths of drilling is conducted on a floor, and a
butt joint sealing
system is adopted to deliver transparent hollow pipes to
drill holes in a section-by-section
butt joint mode; after
casting is conducted in gaps between the
drill holes and the transparent hollow pipes for anchorage, a detecting and positioning
assembly is utilized to
record surrounding rock gaps of the drill holes at different positions on a
measuring ruler, and floor's mining fracture law evolution monitoring tasks are carried out at different mining stages for multiple times till data trends to stable observation finishing. According to the method, floor shallow part drill holes, floor middle deep drill holes and floor deep part drill holes extending from the floor
drill site to the mining
coal floor and arranged side by side are arranged in a stereo mode, the middle floor plastic
failure zone developmental morphology during mining and floor
failure zone developmental morphology can be delineated by observing the adjacent drill holes and the gap situations of the same drill holes at different
coal mining stages at the same time, and reliable data reference can be provided for safe construction.