Geophysical seismic and electrical resistivity tests across the subsidence damage sections of new constructed highway in Sector F-2, Mafraq City, Abu Dhabi Emirate, UAE, were carried out that provided accurate and consistent techniques of estimating near-surface shear wave velocity and resistivity numerical values utilizing both Multichannel Analysis Surface Wave (MASW) and Electrical Resistivity Tomography (ERT), The surveys were conducted using both Geometries Geode instrument/24 geophones spaced by 2m apart in a roll-along mode with 20m source offset / 4m of source-receivers configuration (SRC) Move and Supersting resistivity meter/56 electrodes with pole-dipole array at 2m electrode spacing. Each ERT line was extended several meters beyond the plot boundary to ensure that a minimum depth of investigation of 25m below existing ground surface was obtained. SurfSeis, Parkseis, RES2DINV and AGI Earthlmager software's were used to invert the raw data, producing plots of velocity/resistivity as functions of depth and distance along the survey lines. Shear wave velocity and electrical resistivity data were acquired along eight survey lines over the site. In this project, features of geotechnical concern potentially related to underground loose fill materials and layers with high content of salt have been identified and an attempt has been made to evaluate the spatial variability of the depth and extent of the loose and high salt concentration layers beneath the damaged road across the site project.
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