A STUDY ON THE BOND PROPERTIES OF CABLE BOLTS BASED ON BOND STRESS DISTRIBUTION

Abstract

The purpose of this study is to evaluate the bond properties of cable bolts based on bond stress distribution during pull-outs, and to clarify local bond stress - slip behavior for numerical models. Pullout tests of cable bolts have been conducted in laboratories, using varying levels of grout strength, confining stiffness, embedment length, grout thickness and the number of strands.
Results of the experiment have demonstrated that the cable bolt was pulled out rotationally along with the strand, and the bond strength, based on local bond distribution, did not rely on grout strength, confining stiffness, etc.
Using the bond parameters of Sbond and Kbond that were obtained from the experiment, we have simulated the result of a field pull-out test by UDEC. Results of the analysis have indicated that the axial force distribution coincides with the results of the field measurement.