采用基于 S- R定理的大变形理论 ,运用拖带坐标描述法 ,研究了锚杆在节理岩石中的拉剪局部大变形行为 ;推求了锚杆大变形应变的计算公式 ,得出了锚杆拉剪应变分量的理论规律 ;指出可以通过位移量测确定锚杆变形与内力 ,由多种岩石加锚剪切实验结果证实了理论方法正确可靠 Based on the large deformation theory based on S-R theorem and the drag coordinate description method, the local large deformation behavior of rock bolt in jointed rock is studied. The calculation formula of large deformation strain of rock bolt is deduced. It is pointed out that the deformation and internal force of anchor can be determined by the displacement measurement. The experimental results of anchoring with various rocks and anchors confirm that the theoretical method is correct and reliable