f LINKING LABORATORY MEASUREMENTS OF GEOPHYSICAL PROPERTIES TO ENGINEERING PROPERTIES, QUANTITATIVE AND QUALITATIVE MINERALOGY, AND FIELD DATA

Near-surface geophysics spans a wide range of methodologies and applications but one common theme is the desire to understand the relationships between the properties of the soil and the measurement methods. As part of a multi-year series of projects the U.S. Army Engineer Research and Development Center has been performing field geophysical data collections and soil sampling on multiple scales at a range of locations both domestically and internationally. This presentation will cover the range of measurements that have been performed to fully characterize the geophysical properties (electrical resistivity, magnetic susceptibility, dielectric permittivity, p-wave and s-wave velocities, moisture content measured with lowfield nuclear magnetic resonance), engineering properties (grain size distribution, moisture content, compressive and shear strength), and qualitative and quantitative mineralogy (X-Ray Diffraction, X-Ray Fluorescence, Scanning Electron Microscopy, Differential Thermal Analysis, Differential Scanning Calorimetry, Thermal Gravimetric Analysis). The geophysical properties have been measured over a frequency range from 10 mHz to 8.5 GHz. There will also be a discussion of some of the methodologies that have been employed for analysis and interpretation of individual results and also how to link the physical properties across disciplines. A dataset of this size requires several types of analyses to identify correlations in physical properties and allow more detailed explorations of the relation between physical properties.