Abstract: Anchor reinforcement is one of the main support ways in rock engineering. How to bring out the composite reinforcing mechanism of cable to rock, as well as the invalidation mode of cable reinforcement is becoming a focus. By using the FLAC software, the transverse anchored large specimens numerical experiment under uniaxial compressive stress conditions has been done. It is shown that the cable composite reinforcing action for rock mass depends on not only the magnitude of compressive stress, but also the magnitude of cohesion on the bonding interface between rock and cable. As the decrease in cohesion on the bonding interface, the bonding interface stress and cable stress decrease correspondingly. After the cohesion on the bonding interface decreases to a certain magnitude, the cable will separate from the rock and the slide on interface will occur, i.e. the anchor reinforcement is invalid. So to enhance the cohesion on the bonding interface is an important measure for ensuring the anchor reinforcement valid. Besides, because it is difficult to manufacture the large anchored rock specimens and it is difficult to make mechanical experiments in laboratory, numerical simulation experiments have many advantages such as time-saving, economical and visua. So doing numerical simulations instead of making experiments in laboratory for anchored rock is a promising way in the future, it is valuable for generalization.

Key words: transverse anchor reinforcement, large specimen, rock, numerical simulation experiment, interface, invalidity