Multi-stage yielding adjustable large-deformation anchor rod and method

The multistage yielding adjustable large-deformation anchor rod comprises a rod body, a pressure bearing cylinder and a protective cover, the rod body comprises a section A, a section B and a section C, one end of the section B is connected with the section A, the other end of the section B is connected with the pressure bearing cylinder and the section C, the section C is connected with the pressure bearing cylinder through an adjusting assembly, and one end of the section C is connected with the protective cover. According to the multi-stage yielding adjustable large-deformation anchor rod, the pressure bearing section adopts the multi-step sleeve and bears the specified nut pressure value in sequence, the pressure bearing section of the rod body is provided with the multiple sections of threads, the nut is subjected to shear failure within the set force value range by utilizing the material strength difference of the rod body and the nut and setting the failure coefficient of the threads, and therefore the