Abstract: In this study, the anchored rock slope with weak intercalated layers was investigated by using the FLAC3D software. The modified cable element modeling and improved shear stress extraction method were used to analyze the shear between two anchorage interfaces of the anchored rock slope and its evolution law, respectively. The results showed that the shear stress at the mortar-rock interface was much smaller than that at the anchor-mortar interface, while these two shear stresses extended in opposite directions from the neutral point on the anchor rod. In addition, the shear stress distributed unevenly and mutated near the neutral point. With the increase of the seismic response of the slope, the anchorage interface in the unstable rock was first debonded, and then the anchorage interface in the bedrock was also debonded. Meanwhile, the debonding propagated toward the anchor head and the anchor root, respectively, until the pull-out section or the anchorage section was completely debonded and destroyed. We obtained the shear stress, the distribution of shear stress, and the debonding failure process at two anchorage interfaces of the slope under earthquake. The shearing interaction and anchorage failure mechanism at the anchorage interface were revealed and verified by experiments. The research results provide important references for the design and construction of the anchorage slope.

Key words: rock slope, anchorage, anchor-mortar interface, mortar-rock interface, peak shear stress