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http://dx.doi.org/10.7843/kgs.2008.24.10.33

Study on Comparison of Methods for Estimation of Shear Wave Velocity in Core Zone of Existing Dam  

Ha, Ik-Soo (Dam Engrg. Research Center, Korea Institute of Water and Environment, Korea Water Resources Corporation)
Oh, Byung-Hyun (Dam Engrg. Research Center, Korea Institute of Water and Environment, Korea Water Resources Corporation)
Publication Information
Journal of the Korean Geotechnical Society / v.24, no.10, 2008 , pp. 33-43 More about this Journal
Abstract
In this study, for the purpose of evaluating the shear wave velocity in core zone, cross-hole test, down-hole test, MASW (Multi-channel Analysis of Surface Wave), and seismic reflection survey were carried out on the crest of the existing 'Y' dam. The results of field tests were compared one another. Furthermore, the field test results were compared with the result by the Sawada's empirical recommendation method. The purpose of this study is to compare the results of four kinds of field tests for evaluation of shear wave velocity in core zone of existing dam, to verify applicability of the empirical method which was recommended by Sawada and Takahashi, and to recommend a reasonable method for evaluation of shear wave velocity which is needed to evaluate tile maximum shear modulus of core zone. From the results of four kinds of field tests such as cross-hole test, down-hole test, MASW, and seismic reflection survey, it was found that the shear wave velocity distributions were similar within 18 m in depth and the results obtained by MASW and seismic reflection survey were almost the same by 30 m in depth. For evaluation of shear wave velocity in core zone of the existing dam, in consideration that it is not easy to bore the hole ill the core zone of existing dam, surface surveys such as MASW and seismic reflection method are recommended as realistic methods. On condition that it is impossible to conduct the field test and it is preliminary investigation, it is recommended that Sawada's low bound empirical equation be used.
Keywords
Core zone; Cross-hole test; Down-hole test; MASW; Maximum shear modulus; Seismic reflection survey; Shear wave velocity;
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