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http://dx.doi.org/10.9720/kseg.2011.21.1.015

Physical Properties of and Joint Distribution Within the Cheongju Granitic Mass, as Assessed from Drill-core and Geophysical Well-logging Data  

Lee, Sun-Jung (Dept. of Earth and Environmental Sciences, Chungbuk National University)
Lee, Cheol-Hee (Dept. of Earth and Environmental Sciences, Chungbuk National University)
Jang, Hyung-Su (Dept. of Earth and Environmental Sciences, Chungbuk National University)
Kim, Ji-Soo (Dept. of Earth and Environmental Sciences, Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.21, no.1, 2011 , pp. 15-24 More about this Journal
Abstract
To clarify the distribution of joints and fracture zones in the Cheongju granitic mass, we analyzed drill-core and geophysical well-logging data obtained at two boreholes located 30 m from each other. Lithological properties were investigated from the drill-core data and the samples were classified based on the rock mass rating (RMR) and on rock quality designation (RQD). Subsurface discontinuities within soft and hard rocks were examined by geophysical well-logging and cross-hole seismic tomography. The velocity structures constructed from seismic tomography are well correlated with the profile of bedrock depth, previously mapped from a seismic refraction survey. Dynamic elastic moduli, obtained from full waveform sonic and ${\gamma}-{\gamma}$ logging, were interrelated with P-wave velocities to investigate the dynamic properties of the rock mass. Compared with the correlation graph between elastic moduli and velocities for hard rock at borehole BH-1, the correlation points for BH-2 data showed a wide scatter. These scattered points reflect the greater abundance of joints and fractures near borehole BH-2. This interpretation is supported by observations by acoustic televiewer (ATV) and optical televiewer (OTV) image loggings.
Keywords
borehole; geophysical well-logging; dynamic elastic modulus; seismic tomography; joint; image logging;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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