TitleNS12A-0242 - Characterization of subsurface soil and coal seam using ERT derived Geotechnical parameters
Session Start2022-12-12 09:00:00 CST
Session End2022-12-12 12:30:00 CST
LocationMcCormick Place, Poster Hall, Hall - A
AuthorRupesh
AbstractSoil parameters assessment is essential for sustainable civil engineering constructions. Collecting soil samples from the borehole and obtaining geotechnical parameters in a laboratory is time-consuming, expensive, and laborious. In the present work, Electrical resistivity tomography (ERT) data provided an alternative way to get geotechnical parameters (Plastic index, Moisture content, and Friction angle) to characterize the subsurface properties in less time. ABEM Terrameter LS 2 instrument used for ERT data acquisition in the coal seam area; The Profile length was 400 m with an electrode spacing of 10 m. Inversion of ERT data performed through the Res2dinv program based on the smoothness-constrained least-square method. Approximate true resistivity values were obtained from the inversion technique with reasonable root mean square (RMS) error. For high resolution, the results were interpolated with every 2 m interval. Polynomial regression fitting approximation was used for cohesion variation with resistivity values. All resistivity data was analyzed and demonstrated its relationship with geotechnical properties. Electrical resistivity correlated well with geotechnical parameters. Finally, the low-strength soil and the main factors that affected resistivity contrast in the coal seam zone were interpreted. This study could assist civil and mining engineers in future constructions.