Assigning Resistivity Values to Rock Quality Designation indices Using Integrated Unmanned Aerial Vehicle and 2D Electrical Resistivity Tomography in Granitic Rock

Résumé

Abstract Rock quality designation (RQD) is a standard technique in mining and geotechnical investigation for quantifying the quality and degree of jointing of the rock mass. However, the need for expeditious and inexpensive geotechnical site characterization is the main motivation for the modification of RQD. This research work integrates 2D Electrical Resistivity Tomography (2D ERT), Unmanned Aerial Vehicle (UAV) and borehole to assign resistivity values to various RQD indexes. The UAV survey was performed to calculate RQD on the rock surface using volumetric joint counts (Jv), whereas the 2D ERT survey provides the corresponding resistivity values. A limited number of core samples were also gathered to validate the o the 2D ERT investigation. Combine 2D ERT and UAV provides resistivity values for various RQD indices such as very poor rocks (<350 Ωm), poor rock (350-1150 Ωm), fair rock (1150 – 1850 Ωm), good rock (1850 -2500 Ωm) and > 2500 Ωm excellent rock. Based on the established correlation of RQD and resistivity, the subsurface rock mass quality at Site 1 was predominantly good and excellent rock, while at Site 2, poor rock was significantly reported. This research study concluded that rock mass characterization using RQD is more rapid and inexpensive than the direct or indirect calculation of RQD.

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