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Analysis of Co-relationship between Rock Mass Grade by RMR and Estimation Method of Rock Deformation Modulus by Suggested Formulas  

Do, Jongnam (한국도로공사 도로교통연구원)
Lee, Jinkyu (한양대학교 대학원 건설환경공학과)
Chun, Byungsik (한양대학교 공과대학 건설환경공학과)
Publication Information
Journal of the Korean GEO-environmental Society / v.13, no.4, 2012 , pp. 13-26 More about this Journal
Abstract
The deformation modulus of rock masses is a very important design factor for the computation of stability of tunnels and their support systems. Several empirical formulas to estimate the deformation modulus using simple rock classification methods such as RQD or RMR are widely used because field tests to evaluate the deformation modulus are very expensive and time consuming work. However, these formulas can be depended on experiences from the characteristics of local sites in each country. So it is possible that there might be limitations to estimate appropriate deformation modulus in South Korea using the empirical formulas. Therefore, in this study, the applicability of empirical formulas was analyzed by comparing estimated value with the measured value from eight sites in South Korea. The results show that the estimated value based on the empirical formulas partially have tendency to overestimate. Especially, in case of sedimentary rocks, it was too difficult to apply to the empirical formulas because there was no relation ship between estimated value and measured value. For these reasons, additional data from many tests and accurate analyses are necessary to evaluate the estimation method for the deformation modulus considering the local characteristics of rock masses.
Keywords
Deformation modulus; Pressuremeter test; RQD; RMR; Rock classification method; Empirical formula;
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