Materiały konferencyjne SEP 2018

XXVII SCHOOL OF UNDERGROUNDMINING 2018 , Cracow, Poland CONDITION FOR USING OF BOLTING SYSTEMS Self-support bolting system do not be used:  Coefficient RMR is lower than 41  Water inflow from one instalation borehole is higher than 0.01 dm 3 /min  If the coal seam with thickness 1m is in overburden to the distance 5 m from roof of bolting seam  Dip of seam is higher than 22°  A limitation is also the rule that forbids using of the self-support bolting system in areas with 3rd rockburst risk