The Combination Of The Sasw Method And Dcresistivity In Characterization Of Old Landfills

Two landfills were investigated aiming at finding out what advantages could come out of<br>using two geophysical methods providing each geometrical information or mechanical<br>information in combination. An old landfill previously characterized by 2D-resistivity<br>surveying was reinvestigated using surface wave seismics, SASW. Four points were chosen<br>for SASW tests located along the resistivity profiles. On a modern landfill an area used as<br>reference site, a specific cell with a volume of 40 x 40 x 9 m, a second survey was carried out<br>using true 3D-resistivity and SASW in five points. The objective of the project was mainly to<br>find out if a change in resistivity corresponded to a change in shear wave velocity. It was<br>concluded that the combination of the SASW method and resistivity surveying is an efficient<br>use of geophysical methods when the aim is to geotechnically characterize the subsurface.