The spalling limit in transversely isotropic materials, the prediction of the maximum height of failure, and the design of long-tendon roof support systems

What is it about?

Outlines a way of estimating the mass of rock that needs to be suspended by long tendons in coal mine roadways. This is needed if the failure zone in the roof is higher than the length of the installed bolts.

Featured Image

Why is it important?

Suggests that long tendons should not be fully grouted if there is a stress change in the roof after the tendons are installed. This is contrary to what is becoming standard practice in Australian coal mines