The ability to transfer the load between bolt, grout, and rock depends on grout annulus, grout strength, bolt profile characteristics, the roughness and strength of the rock, and mechanical properties of the bolt. When axial shearing occurs during rock movement, the load is transferred to the bolt as the grout interface shears 1. Finally, different surrounding rock characteristics were entered in the model and load transfer capacity along the bolt was predicted.ĭuring rock movement, the load is transferred from the bolt to the rock via the grout by the mechanical interlocking action between surface irregularities at the interfaces. The model was evaluated both with and without an end-plate. In this research, to define the load developed along the bolt, an analytical model of a bolt embedded in elasto-plastic rock mass conditions was developed. The characterization of the bolt surface has major effect on the load transfer capacity of a fully grouted bolt, because surface roughness dictates the degree of interlocking between bolt and resin. There are limitations to pull tests in determining the resistance of interfaces, as stress distribution in the system is affected by the geometry of the bolt, borehole, and the embedment material properties. The interface shear stresses, rather than the grouting material itself, are of great importance in the overall resistance of a rockbolt system. Keywords: fully grouted bolt, axial load, elastoplastic, analytical, numerical-load transfer. Finally, the load along the bolt was predicted in different surrounding rock mass characteristics. These factors were analytically evaluated. The load transfer mechanism of a fully grouted bolt is a function of parameters such as bolt length, shear stiffness of interfaces, in situ stress, presence of face-plate and distance along the bolt. Bolt and surrounding materials were assumed to be elastic and elastoplastic materials respectively. The research considered the effect of bolt end-plate on load transfer capacity. In this research, the load transfer capacity of a fully grouted bolt is evaluated analytically in an elasto-plastic rock mass condition. The main reason is that they offer high axial resistance to bed separation. Nowadays, fully encapsulated rockbolts have become a key element in the design of ground control systems. An analytical solution to predict axial loadalong fully grouted bolts in an elasto-plastic rock massĭepartment of Petroleum and Mining Engineering, Environmental and Energy Research Center, Shahid Bohanar University of Kerman-Iran
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