A laboratory and field investigation of the major factors influencing bond capacity of grouted cable bolts

Laboratory grout tests indicate that compressive strength increases with lower water to cement ratios; however, high variability of strength results from grouts with water to cement ratios of around 0.3. Triaxial testing indicates that grout strength does not increase significantly under confinement.;Laboratory cable bolt pull tests were performed to determine the influence of grout strength and confinement on bond capacity. Rock mass confinement was simulated using confining tubes of steel, aluminum and PVC.;Laboratory and field results suggest that higher grout strength and/or greater confinement provided by either the rock mass or laboratory confining tubes lead to higher cable bond capacities and the influence of grout strength and confinement on bond capacity are not independent of one another. (Abstract shortened by UMI.).