An Estimation of Rock Quality for Excavation by using Reflection Logging

Abstract

In estimating rock quality for the excavation no study has hitherto been made on hardness and clacks of rocks.
In this paper the rock quality was studied from view-points of hardness, clacks and heterogeneity of rocks by using results of the reflection logging. Namely, the effect of them was shown by Nm, avarage of multiple reflection, and Hc, coefficient heterogeneity.
In this paper the above-mentioned rock quality in a granite field was compared with actual results of grab excavation. As results of this comparison a relation was observed among above mentioned subjects.
The rock quality for excavation (G) is shown by equation