CHINA MINE ENGINEERING

In order to investigate the mechanical properties of bolts in the process of roadway support, this paper adopts distributed fiber optic sensing technology to monitor the mechanical properties of two bolts of different diameters under the action of axial load respectively, and analyzes the strain law of both of them in the process of axial deformation. The results show that the larger the diameter of the bolt under axial load, the stronger the resistance to elastic deformation at the elastic stage; With the increase of axial load, the strain increment near the neck contraction fracture position of bolt is larger than that at other positions; The distributed optical fiber sensing technology can monitor the stress-strain state of the bolt under axial load in real time, and can judge the specific location of the neck contraction phenomenon when the bolt is broken.