Abstract: The aim of this study is to investigate the effects of anchoring mode and bedding on mechanical properties of anchored rock. Similar materials were used to precast bedding rocks and standard specimens with 0° and 90° bedding were made in the laboratory. Anchor bolts made of #45 steel were applied to perform end anchoring and full-length anchoring, and thus, three kinds of specimens were obtained by end-anchoring, full-length anchoring and non-anchoring, respectively. The uniaxial compressive strength (UCS) and deformation of specimens were obtained by using MTS815 rock mechanical experiment system. The results show that the UCS of rock was enhanced by the anchor. Specifically, the UCS increment was influenced by the bedding direction and anchoring mode. For anchored specimens with the same bedding, the UCS increment of full-length anchored rock was greater than that of the end-anchored rock. For the specimens with the same anchoring method, the increase amplitude of UCS of anchored specimen with 90° bedding was higher than that of the anchored specimen with 0° bedding. It is found that failure modes of anchored specimens are affected by anchoring types and they are further divided into shearing extension and shearing offset. Failure modes of anchor in anchored specimens are not affected by anchoring methods, and both of anchoring methods slipped between rock mass and grouting interface. However, the differences between the end anchorage and the full-length anchorage are that the latter has longer bond length between the anchor and rock, the higher bond strength was, and the more and thicker rock debris were after failure.

Key words: Bedding, anchored rock, mechanical properties, anchoring mechanism, failure mode