Mechanical Properties of Full-Grouted Prestressed Anchor Bolts under Typical Bed-Separation Conditions

For tunnel-support engineering, the bed separation of surrounding rock has a great influence on support performance bolts. In order to reveal mechanical properties full-grouted prestressed bolt under separation, three typical working conditions single-separation, multi-separation and different positions were set up, theoretical models numerical established. Furthermore, characteristics axial force anchorage–interface shear stress analyzed by method, sensitivity based an orthogonal test was studied means range analysis variance analysis. The results showed that: (1) single-separation condition, value significant effect bolt, with increase in value, sliding failure unit increases; (2) for conditions, if total is same, number interfaces beneficial bolt; (3) case where layer located at positions, right side more likely cause overall slip (4) above influencing factors, greatest position least influence.