Detection of anomalous features in an earthen dam using inversion of P-wave first-arrival times and surface-wave dispersion curves
K. Y. Kim 1 5 K. M. Jeon 2 M. H. Hong 3 Young-gyu Park 4
+ Author Affiliations
- Author Affiliations
1 Department of Geophysics, Kangwon National University, Chuncheon 200-701, Korea.
2 Office of Technology, Daewoo Shipbuilding Marine Engineering E&R, Seoul 100-180, Korea.
3 E&P Technology Team, LG International Corp., Seoul 150-721, Korea.
4 Office of Environmental Geology, Korea Rural Community Corporation, Euwang-si 437-703, Korea.
5 Corresponding author. Email: kykim@kangwon.ac.kr
Exploration Geophysics 42(1) 42-49 https://doi.org/10.1071/EG10047
Submitted: 31 October 2010 Accepted: 13 December 2010 Published: 25 February 2011
Abstract
To locate anomalous features including seepage pathways through the Daeryong earth-fill dam, P and Rayleigh waves were recorded along a 250-m profile on the crest of the dam. Seismic energy was generated using a 5-kg sledgehammer and detected by 24 4.5-Hz vertical-axis geophones installed at 3-m intervals. P-wave and apparent S-wave velocities of the reservoir dam and underlying bedrock were then inverted from first-arrival traveltimes and dispersion curves of Rayleigh waves, respectively. Apparent dynamic Poisson’s ratios as high as 0.46 were obtained at the base of the dam near its north-east end, where an outlet conduit occurs, and in the clay core body near the south-west end of the profile where the dam was repeatedly grouted to abate seepage before our survey. These anomalies of higher Poisson’s ratios in the upper part of clay core were also associated with effusion of grout on the downstream slope of the dam during post-survey grouting to abate leakage. Combining P-wave traveltime tomography and inversion of Rayleigh wave velocities was very effective in detecting potential pathways for seepage and previous grouted zones in this earthen dam.
Key words: apparent dynamic Poisson’s ratio, embankment dam, seepage pathways, surface wave dispersion, traveltime tomography.
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