Modelling the Load-Displacement Behavior of Fully Grouted Cable Bolts Under Constant Normal Stiffness

Cable bolts are extensively used as the most reliable support systems in underground and surface structures leading to some investigations on the characterization of the performance of the cable bolts under different conditions including field and laboratory environments. This paper aims to develop an analytical model for prediction of the full load-displacement performance of the Sumo cable bolt under constant normal stiffness which due to its unique design it has been classified as the modified cable bolt. The model includes nonlinear dilation and incremental shear load equations inspired by rock joint discipline. The nonlinear shear displacement between the cable bolt and the grout is captured through a loop of incremental raise in the axial load for a given unit displacement. The model is then calibrated against the experimental data obtained from Sumo cable bolt. A good agreement was found between the model simulations and the experimental results confirming the applicability of the proposed constitutive model for the performance prediction of the Sumo cable bolts tested under constant normal stiffness.