Load capacity of fully grouted rock bolts in shale

Support of underground excavations by resin grouted rock bolts is common in mining and civil engineering. However, the interactions between bolt and rock are not fully understood. Laboratory tests have been conducted for evaluating the shear strength of rock bolts under confining stresses, as it is the case in-situ. Particularly for shale very high values for cohesion and friction were found. Reliable input parameters for numerical modeling rock bolt behavior by FLAC have been determined and were successfully applied.