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http://dx.doi.org/10.7474/TUS.2018.28.3.232

Comparison of Seismic Velocity and Rock Mass Rating from in situ Measurement  

Lee, Kang Nyeong (Dept. of Civil Engineering, The University of Suwon)
Park, Yeon Jun (Dept. of Civil Engineering, The University of Suwon)
Kim, Ki Seog (Heesong Geotek, Co., Ltd.)
Publication Information
Tunnel and Underground Space / v.28, no.3, 2018 , pp. 232-246 More about this Journal
Abstract
In this study, the relationship between in situ seismic wave velocities and RMR (rock mass rating) was investigated in a test bed for the examination of the basis of rock classification (RMR) based on seismic wave velocity. The seismic wave velocity showed a monotonous increase with depth. It was also found that there was no systematic correlation between the seismic wave velocity (Vp) and other parameters (RQD, joint spacing, UCS, rock core Vp, and RMR) collected at the same depth of the same borehole. However, correlative relation was observed among RMR, RQD, and joint spacing. On the other hand, when all the data in the borehole (three holes) are examined without considering the depth, Vp still shows no correlation with RMR parameters (e.g., correlative coefficient for uniaxial compressive strength and joint spacing are 0.039 and 0.091, respectively), but Vp shows weak correlative relation with RMR and RQD (correlative coefficient for RQD and RMR are 0.193 and 0.211, respectively). Thus, it is found that it is difficult to deduce physical properties of rock mass directly from seismic wave velocities, but the seismic wave velocity can be used as a tool to approximate rock mass properties because of weaker correlation between Vp and RMR with RQD. In addition, the velocity value of for soft and moderate rocks suggested by widely used construction standards is slower than that of the observed velocity, implying that the standards need to be examined and revised.
Keywords
Test bed; Seismic velocity; Rock mass classification; Correlation; RMR;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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