Surrounding rock bolt support through internal bolt changing the mechanical State of the rock itself, forming a whole and stable rock around the tunnel, using the interaction between bolt and surrounding rock, achieve the goal of maintaining roadway stability. It is a support method of active defense, mine is supporting major changes.
Bolt will not only support good, simple construction material, and conducive to mechanized operations, construction speed. But anchor not closed rock against weathering surrounding rock; unable to prevent bolt fracture between the spalling of rock.
