Study of reinforcement mechanism of fully grouting rock bolt based on load transfer mechanism Ⅰ;

The theory and method of the grouting bolt are also put forward,which can be used as a instrument of lagged time for directing grouting.

The plastic shell expanding grouting bolt is designed for small anchor hold,roof leaking and wall slicing and so on of bolt timbering appearing in soft wall laneway.

In this paper the experiment and construction of pressed grouting bolt for N2 soil layer sector in Wanjiazhai Yellow River Diversion Project 6# -7# tunnel are mainly introduced.

To strengthen loose surrounding rock,we can support and strengthen it by hollow grouting anchor so as to modify and stabilize its structure.

During the ancient landslide treatment over Baoziliang Tunnel Mai grouting system including grouting anchor and grouting pump, related construction process and deep hole injection technique were used and good results were achieved.

The horizontal stiffness coefficient values of rock anchor under different conditions are obtained through using numerical method to simulate the pullout test of the fully-grouted rock anchor.

In the structure design of the people s Stadium of Dalian City, the rock anchor foundation is adopted to solve the problem about permanent anti-floating stability in the big size underground construction according to the local conditions.

By discussing on the differeces of design for rock anchorage bar between in China and abroad,it is concluded that the different designing results from the dissimilarity of detecting means.