The results indicate that it is essential to revise the boltstress by using the formulas when rock mass is in plastic state.
结果显示，当岩体进入塑性、变形较大时，用推导公式对锚杆变形、应力进行修正是非常必要的。
2
It is possible for the boltstress to decrease after initial tightening, because ofslow creep or relaxation of the gasket, particularly in the case of the "softer" gasket materials.
The monitoring project of Zhouning Hydropower station underground plant and water intake system including monitoring of the surrounding rock deformation, boltstress, osmotic pressure and joint.