With the rapid development of economy, a number of high-rise buildings and infrastructure construction is processing here and there. The rock bolt is widely applied to pre-support project, radial support project, slope stabilization, foundation support project, roadway support project, soil nail wall, back pull anchor rod retaining wall and other rock supporting work.
As the research and actual measurement of the rock bolt supporting method shows, there are three main factors that influences the prestress of the rock bolt:
1) The prestress of the rock bolt will experience three periods after tension fixation: plunging, rising and keeping steady.
2) There is a linear relationship between the displacement and tension load of the rock bolt.
3) The rock bolt whose pull force is dispersible can reduce the stress concentration phenomenon and improve the bearing capacity of rock bolt.
The uniting supporting method of rock bolt and other supporting methods can not only reduce the side displacement of foundation pit, but also to avoid destruction of sliding soil. The research of the main factors influencing the prestress can ensure the efficiency , safety and applicability of the construction.