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http://dx.doi.org/10.9720/kseg.2021.4.507

Crossplot Interpretation of Electrical Resistivity and Seismic Velocity Values for Mapping Weak Zones in Levees  

Cho, Kyoung-Seo (Department of Earth & Environmental Sciences, Chungbuk National University)
Kim, Jeong-In (Department of Earth & Environmental Sciences, Chungbuk National University)
Kim, Jong-Woo (Department of Civil Engineering, Cheongju University)
Kim, Ji-Soo (Department of Earth & Environmental Sciences, Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.31, no.4, 2021 , pp. 507-522 More about this Journal
Abstract
Specific survey objectives often cannot be met using only one geophysical method, as each method's results are influenced by the specific physical properties of subsurface materials. In particular, areas susceptible to geological hazards require investigation using more than one method in order to reduce risks to life and property. Instead of analyzing the results from each method separately, this work develops a four-quadrant criterion for classifying areas of levees as safe or weak. The assessment is based on statistically determined thresholds of seismic velocity (P-wave velocity from seismic refraction and S-wave velocity from multichannel analysis of surface waves) and electrical resistivity. Thresholds are determined by subtracting the standard deviation from the mean during performance testing of this correlation technique applied to model data of four horizontal and inclined fracture zones. Compared with results from the crossplot of resistivity and P-wave velocity, crossplot analysis using resistivity and S-wave velocity data provides more reliable information on the soil type, ground stiffness, and lithological characteristics of the levee system. A loose and sandy zone (represented by low S-wave velocity and high resistivity) falling within the second quadrant is interpreted to be a weak zone. This interpretation is well supported by the N values from standard penetrating test for the central core.
Keywords
crossplot analysis; levee weak-zone; electrical resistivity; seismic velocity; ground rigidity;
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