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http://dx.doi.org/10.14481/jkges.2014.15.3.65

Geostatistical Integration Analysis of Geophysical Survey and Borehole Data Applying Digital Map  

Kim, Hansaem (Department of Civil & Environmental Engineering, Seoul National University)
Kim, Jeongjun (Department of Civil & Environmental Engineering, Seoul National University)
Chung, Choongki (Department of Civil & Environmental Engineering, Seoul National University)
Publication Information
Journal of the Korean GEO-environmental Society / v.15, no.3, 2014 , pp. 65-74 More about this Journal
Abstract
Borehole investigation which is mainly used to figure out geotechnical characterizations at construction work has the benefit that it provides a clear and convincing geotechnical information. But it has limitations to get the overall information of the construction site because it is performed at point location. In contrast, geophysical measurements like seismic survey has the advantage that the geological stratum information of a large area can be characterized in a continuous cross-section but the result from geophysics survey has wide range of values and is not suitable to determine the geotechnical design values directly. Therefore it is essential to combine borehole data and geophysics data complementally. Accordingly, in this study, a three-dimensional spatial interpolation of the cross-sectional distribution of seismic refraction was performed using digitizing and geostatistical method (krigring). In the process, digital map were used to increase the trustworthiness of method. Using this map, errors of ground height which are broken out in measurement from boring investigation and geophysical measurements can be revised. After that, average seismic velocity are derived by comparing borehole data with geophysical speed distribution data of each soil layer. During this process, outlier analysis is adapted. On the basis of the average seismic velocity, integrated analysis techniques to determine the three-dimensional geological stratum information is established. Finally, this analysis system is applied to dam construction field.
Keywords
Borehole investigation; Geophysical survey; Digital map; Kriging; Outlier analysis;
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Times Cited By KSCI : 3  (Citation Analysis)
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