THE COMPARISON OF ROCK ANCHORAGE BAR BETWEEN THE DESIGNS IN CHINA AND ABROAD

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.During the detecting of anchorage bar in China,the ground is taken as the counter-force device for pull-out type test,thus the counter-force from the jack adds a load to the rocks.Therefore,the consideration on the defomation and destroy of the anchorage bar is confined in the following three aspects:1)the reinforcing bar and other materials; 2)the gripping power of the mortar in anchorage section to the steel pulling bar;and 3)the friction between the rocks in anchoring section and the mortar.While the problems in keeping the entirety stability of the anchoring earth in the most unfavorable conditions are not under consideration.