Ground actions imposed to the support system in a rock burst

Abstract

We use Displacement Spectra to describe the ground movement from a rock burst and to characterize the response capacity of the support system. Comparing both Displacement Spectra we obtain a simple indicator of the support adequacy. We perform a numerical analysis of the support behavior in cases that could be well documented. The results suggest large amplification of the ground movement near the surface of the tunnels. The analysis also suggests that the support failed at PPV values of 3 to 6m/s, however, the ejection velocity of the support was smaller, up to 5 m/s