Abstract:

The concept of key-block system is proposed on the basis of the key-block theory developed by Goodman-Shi and the key-block group theory developed by A.R.Yarahmadi Bafghi. It describes the method of how to find out the key-block and key-block system, the graphical key-block analysis technique and the vector key-block analysis technique, and proposes the method that reinforcing rock combined with characteristics of unstable rocks, deformation and failure mechanism and effective reinforcement measures. The key-block system anchoring technique includs the key-block system method and anchoring rock with systematic, it avoids the shortcomings of the current design theory. By establishing geological model and mechanics model of unstable rock of Jidan road from K49+790 m to K55+550 m and analyzing the deformation failure mechanism of slope and anchoring mechanism, a anchoring plan to control the dangerous rocks is suggested which is clearing the unstable rock at the top of slope, shotcreting the fractured slope face, and then bolting the rock blocks. The plan saves 35% of amount of bolts,32% of toatal SNS,19% of sum of beams compared with traditional method.

Key words: rocks, slope stability, unstable rock, key block, key-block group, anchoring method