Cumulative damage and bearing capacity attenuation law of anchorage structure interface under cyclic loading and unloading

Abstract The specimens of anchorage structures bonded by different anchoring materials are prepared to study the damage and reduced safety reliability caused cyclic loading unloading stress roadway structure. Using Fiber Bragg grating, acoustic emission monitoring ANSYS, structures’ bearing properties, interface failure characteristics, overall mode internal influence mechanism obtained under path. Results show that cracks at would develop expand rapidly this path, cumulative is primarily repeated residual deformation, periodic opening-expanding-closing cracks, impact vibration resulted from large-scale unloading. Compared with results single pull-out stress, ultimate loads H S 30.8% 45.5%, respectively, radii inner increased 1.64 1.67 times, showing a significant decrease in capacity these two have more prominent brittleness weaker post-peak than those resin agent. Therefore, balance between bonding strength brittle-plastic extension characteristics shall be fully considered for selection materials. Five modes structure summarized: bolt-anchoring material interface, material-surrounding rock fracture material, bolt, integral bulging Besides, action disturbance, bolt group can mobilize adjacent bolts restrain continuous attenuation middle thus guaranteeing stability.