Experimental and numerical investigations of stresses in a fully grouted rock bolts

摘要: Rock bolts are widely used for rock reinforcement in hard-rock mining and civil engineering since a long time. However the use of fully grouted cable is limited coal mines. In order to improve performance as supplementary roof support system any type condition measured formations, it necessary have good understanding behavior bolt–grout grout–rock interactions well mechanism load transfer bolts. As depends on bond strength, extensive laboratory pullout pushout tests were conducted present investigations with variations bolt diameters, length cement–water mixing ratios grout. The load–displacement curves developed verified numerical results obtained from finite element analysis using ALGOR software. Numerical models validated detailed was carried out know displacement, stress, strain distribution along bolt.