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- W3202679077 abstract "The Geophysical Strata Rating (GSR) is a means of empirically estimating the quality of rock masses through an analysis of geophysical logging data. It is based mainly on sonic log data and it recognises that in clastic sedimentary rocks, sonic velocity varies with both the rock type and the defects present in the form of bedding planes and fractures. Different rock types have different porosities and clay contents. The GSR provides scores based on compositional information obtained from other geophysical logs and combines these with scores based on the sonic velocity. A defect score is then added according to the variability of the clay content and the initial GSR. In this project, an earlier formulation for the GSR has been extended through the development of the defect score. We have analysed geophysical logs from numerous mine sites and compared the GSR values with other ratings. GSR values are provided as a continuous log for each depth point in the borehole. Blocking of units is not required. In rocks of reasonable quality, GSR values are similar to those that are obtained with the Coal Mine Roof Rating (CMRR). In poor quality rocks, particularly those with high clay contents, relatively high porosities and low sonic velocities, GSR values are lower than the CMRR." @default.
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- W3202679077 date "2008-07-15" @default.
- W3202679077 modified "2023-09-27" @default.
- W3202679077 title "Geophysical strata rating" @default.
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