Experimental study of shear behavior of rock–shotcrete interface under dynamic shearing: insights from interface roughness and strain rate

Abstract Rock–shotcrete structures are often suffered from dynamic shearing. However, the understanding of shear response rock–shotcrete is still at its infancy. To investigate effects strain rate and interface roughness on structure, laboratory tests were carried out modified double notched sandstone–concrete specimen. Testing results show that strength peak specimens both far less than those sandstone concrete specimens. With increasing rate, specimen increases failure mode changes interfacial to mixed failure, i.e., interfacial, failure. increase in roughness, sliding fracture shear-off fracture, leading an In addition, it smallest sawtooth angle dominates The findings present study could facilitate behavior mechanism structure subjected loading be helpful efficient design, reinforcement stability engineering.