Abstract: With that the underground projects are widely used, a new technical problem of consolidating and reforming them are proposed. As the peculiar place of underground projects, the technology of growing bars affect the effect greatly. This article expounds the damage mechanism and damage shape of the standing loads bars and researches different rules and shapes of damage of different ways in bonding bars; and compares the damp and arid environment standing loads bars accepting force and damage form. The conclusion that the process and method of bonding bars under damp environment has great effect on bonding result is drawn.

Key words: underground engineering, construction technology, reinforced bars, damp environment, anchorage performance