Influence of Bonding Interface Damage Induced by Roof Separation Layer on Anchorage System of Anchor Bolt

Bolt support is the main support method of underground shaft engineering, in order to study the influence of roof strata separation position on anchor system, the interface bonding with damage and without damage two cases were calculated, numerical analysis and MATLAB results show that: when the bonding interface is not damaged, the maximum roof separation width unchanged; when the bonding interface is damaged, bonding interface evaluates and develops from elastic state to the sliding state even decoupling state, and the influence of the separation location on anchoring strength is very sensitive, and with the moving down of separation position, the damage tolerance of the anchorage system is enhanced.