Investigation of shear and tensile behaviour of fully grouted rock bolts in jointed rock media.
The stability and monitoring of any underground structure during and after excavation are the most important practices for any engineer. There are two ways to stabilise the rock mass, rock reinforcement and rock support. Rock reinforcement is a rock quality improvement technique, where the inherent shear and tensile strength of rock mass are enhanced by inserting bolts, cables and others to control deformation. In CMR 2017, monitoring and performance of rock bolts are specially emphasized in a new scheme called Strata Control and Monitoring Plan(SCAMP). In general, induced stress cause the deformation in mine roof above an excavation and that in turn generates shear deformation across the bolt-grout and grout-rock interfaces. In the presence of joints and bedding planes, roof may slip or sag causing high gradient of axial deformation in rock bolts. This phenomenon increases tensile as well as shear stress in bolt rod. The present state of knowledge about fully-grouted rock bolts enables us to explain, in a qualitative way, the bolting effect at failure and the influence of the main parameters. However, quantitative knowledge is still incomplete, as is the understanding of the progressive action of fully grouted bolts during shear displacements. Therefore, the objective of my research is to obtain more information about aspect of bolting in jointed rock mass.