Rubber Powder Enhancing Slip Resistance at Rock–Concrete Interfaces and Its Mechanism

ABSTRACT The shear parameters at rock–concrete interfaces are key technical indicators for rock‐based structures and are of great significance to the antisliding stability of such constructions. Through in situ shear tests and multidimensional mechanistic experiments, this study investigates the effects of different rubber powder dosages on the shear behavior between concrete and rock foundations and reveals the mechanism by which rubber powder enhances the antisliding stability of rock–concrete interfaces. The results show that when the rubber powder dosage is 20 and 30 kg/m 3 , the shear friction coefficient increases to 1.46 and 1.63 times that of the reference group, corresponding to an improvement of 53.4%–58.0% in antisliding friction. Rubber powder imparts strain‐hardening characteristics to concrete; the fracture initiation toughness of rubberized concrete is 1.17 times that of ordinary concrete, and the instability toughness is 1.24 times, indicating higher fracture energy. In addition, the base reaction distribution of rubberized concrete helps reduce stress concentration at specimen edges. By redistributing internal stresses and mitigating stress concentration, rubber powder enhances the antisliding stability of rock–concrete interfaces, providing a new approach for improving the stability of rock‐based engineering structures.