Back-calculation of failure stress of rockbolts affected by Stress Corrosion Cracking in underground coal mines

This paper examined the effects of freeze-thaw cycling and sulfate attack on the pull-out capacity of rock bolts. The freeze-thaw cycling experiments consisted of alternating 4-hour freeze-thaw cycles in a high-low temperature environmental test system; some specimens were subjected to sulfate attack during freeze-thaw cycling. After exposure to a number of freeze-thaw cycles, the specimens were tested to failure. The displacement, strain and...