Yielding performance of an intelligent terminal structure for cable bolts

Deformable support systems are a new support technology for preventing geo-hazards such as large deformations of engineering rock masses, rock bursts, and roof falling. An intelligent terminal structure (ITS) is a device that consists of a memory tooth and a yield ring. It is assembled at the end of a traditional cable bolt and has the dual functions of adapting to the large deformation of rock masses and sensing the deformation of surrounding rock masses. This study focuses on adapting support systems to the deformation of rock masses dilation of tunnels and other underground engineering projects and monitoring the support systems. The design principle of the ITS of a cable bolt and the technical method for the perception of the deformation of a rock mass are proposed. The results determined that the CB-T6.0-R4.5 design parameters of the ITS of a cable bolt for a deformation support system of surrounding rock masses. This is beneficial for accurately recording the stress and deformation behavior of rock masses through the deformation of the ITS of a cable bolt. Therefore, the cable bolt with an ITS has important value for applications in deformable support technology and safety monitoring of engineering rock mass reinforcement.