The ISRM Suggested Methods for Rock Characterization, Testing and Monitoring: 2007-2014 by R. Ulusay

Author:R. Ulusay
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

7.1.2 Estimation of the Weathering Degree

Hachinohe et al. (1999) described the degree of weathering using the residual strength ratio (R s), which is the ratio of NPI of the weathered part to that of fresh (unweathered) part of rock cores.

(2)

where NPI is the measured value and NPIfp is an average value for the fresh part of each drill core. Based on the relationship between R s and the depth from the bedrock surface, these researchers indicated that R s decreases with increases in the weathering degree and that the longer the weathering time, the larger is the decrease in R s. Hachinohe et al. (1999) determined R s values from Tertiary sandstone and mudstone from the bedrock of marine terraces in Boso Peninsula, Japan. Recently, Aydan et al. (2013) correlated the degree of weathering of soft rocks utilizing the ratio of NPI values of weathered and unweathered soft rocks in a more quantitative manner.

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