Abstract
Interpretation of the data obtained from roof bolt drilling can offer a reliable source of information that can be used to characterize the ground for use in ground support design and evaluation. Drilling for installation of roof bolts is done by various drills and often it is a noisy process. The acoustic emission from the drill can be used as a source for identification of the rock formations and voids/joints in the rock mass. This paper offers a brief review of the ground support using roof bolts, followed by introduction and discussion of the roof characterization methods by instrumented roofbolters. In particular, installation of noise measuring sensors on the drill head to provide additional source of information will be discussed. The analysis and digital filtering of measured noises was used to identify the voids or joints in the full scale testing. A brief overview of the instrumentation and full scale testing, as well as review of the results of initial testing on an instrumented drills will be offered in the paper. The paper will introduce an algorithm for digital filtering of the acoustic emission to identify the discontinuities in the rock mass.
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