国内外岩石锚杆设计之比较

通过对国内外学者在岩石锚杆设计上存在的差异的探讨,认为检测手段的差异是产生认识差异的主要原因.国内锚杆检测将原始地面作为反力装置进行锚杆抗拔试验,千斤顶的反力无形中是对地层施加荷载,使得对锚杆的变形破坏的考虑限制在(1)钢筋或其他材料本身(2)锚固段的砂浆对于钢拉杆的握固力和(3)锚固段地层对于砂浆的摩擦力是否承受极限拉力这3个方面进行考虑,而未能考虑锚固的土体在最不利的条件下需能保持整体稳定性.

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.