Integrated investigation of the instability-prone landfill site

The study was motivated by the landfill surface fracturing and grate doubts regarding to the landfill body stability. Three geophysical methods were used for the site study as follows: electrical resistivity tomography, ground penetration radar and seismic refraction. Application of the geophysical methods was combined with borehole drilling campaign, DPSH testing and inclinometer measurements. As a results of common geophysical geotechnical data processing 3D model of the landfill body was built, the regions of leachate concentration were found and waste physical properties were studied. The weak zone observed in the landfill bode and very a low values of P-wave velocity certainly indicated intensive waste disintegration and hence confirmed our work hypothesis on the lower waste body stability that was aggravated by the leachate location at the landfill body bottom. Inclinometer measurements indeed corroborated high values of waste instability. Application of the integrated methodology allowed one to assess waste and leachate condition and not only to evaluate the landfill stability in general, but also to locate the most sensitive its parts.