Interactional mechanics characteristic of tensioned fast-slow set full-column bolts and rock mass

A comparative analysis was done to reveal the advantage of a tensioned fast-slow set full-column bolt over a common full-column resin bolt.The interactional mechanics characteristics between a tensioned fast-slow set full-column bolt and rock mass were studied to find out the stress distribution of the bolt both in the axial and lateral directions.It is shown that the stress state of wall rock is effectively improved due to the axial action of the bolt.But the lateral action of the bolt includes filling the rock crevices and restraining the shear sliding,which effectively improve the mechanical properties of wall rock.Finally,the mechanics characteristics of the bolt in the jointed rock were discussed.The result indicates that there exist several axial stress peaks.