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An Evaluation of Empirical Prediction Equation for Deformation Modulus of Rock Masses by Field Measurements  

Chun Byung-Sik (한양대학교 공과대학 토목공학과)
Lee Yong-Jae (한양대학교 공과대학 대학원 토목공학과)
Ahn Kyung-Chul ((주)태조엔지니어링 지반사업부)
Shin Jae-Keun ((주)태조엔지니어링 지반사업부)
Jung Sang-Hoon ((주)태조엔지니어링 기술연구소)
Publication Information
Tunnel and Underground Space / v.16, no.3, 2006 , pp. 251-258 More about this Journal
Abstract
In this paper, the applicability to the Korean rock condition of using the deformation moduli based on Rock Mass Rating (RMR) and Pressuremeter Test (PMT) is evaluated. The correlations among deformation moduli and various rock properties were also analyzed. It appears that the existing correlations using RMR overestimate the deformation moduli and wide variation was found between predicted moduli using these correlations and measured values. As for the correlations among the deformation moduli and various rock properties, Rock Quality Designation (RQD) and unconfined compressive strength (UCS) were found to correlate to deformation moduli reasonably well, but joint spacing and joint conditions appear to correlate poorly to RQD and UCS. Additionally, groundwater can not be correlated with the modulus values. While the depth has very little contribution to deformation modulus, it should be factored in the simple regression analyses with various rock mass properties, especially with the correlations made with UCS, RQD etc. With the deficiencies of these correlations, more in depth analysis techniques such as multivariate correlations may be to reliably estimate deformation modulus of rock mass.
Keywords
Deformation modulus; Pressuremeter test;
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