At present, the anchor bolt commonly used in better geological conditions in geotechnical engineering, the supporting effect is good.But in the soft surrounding rock under complex conditions, such as crushing, high ground stress of the large deformation of tunnel, the anchor bolt
support is still unsolved problem. It is widely believed that develop the anchor bolt support which has a strong hold, shock resistance, high
resistance to mechanical characteristics , which is a efficient path to control the high stress and soft rock of large deformation tunnel,anchor bolt support is the main development direction.
Under the action of long anchor bolt, because the long anchor bolt has strong anchoring force, improve the stress state of surrounding rock, near the airport surface deep weak rock mass stability and the stability of good rock mass through the long anchor bolt together, enhance the
overall function of rock mass structure, the integrity and bearing capacity of surrounding rock is improved, the stability of surrounding rock is improved significantly.