Researches on pull-out capacity calculating method of rock bolt foundation

The experiment and application studies of rock bolt foundation in North China area in 2005 indicated that it is feasible to use rock bolt foundation in North China s strong weathered rock foundations.

Based on the experiment study project of rock bolt foundation in North China and its application in Hun-BaLine and Shang-Chen Line construction, this paper discusses technique of rock bolt foundation construction in strong and medium weathered rocks, such as granite, gneiss and limestone.

The anchored bolt foundation hasn\'t been studied and applied in this geological condition.

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.