Geotechnical Risk Assessment and Geological Origin of Building Fracturation in Agadez City (North Niger)

The Agadez city is built on the faulted and fractured sandstones formation of “Agadez Sandstones”, which deposit in unconformity Precambrian basement Aïr Mountain. present study focuses geotechnical risk assessment geological origin building fracturation city. A methodological approach integrating measurement fractures planes affecting buildings their statistical analysis has been implemented. Statistical obtained data showed that 100 buildings, about 3% are at collapse (very high risk), 64% (medium collapse), 34% cracked (lower collapse). These results as well nature material (rheology) influences fracturation. Indeed, made from cement more easily than clay materials. fracture reveals associated with propagates NW-SE, corresponding to major directions propagation, mainly dipping northwest sectors (zones) interpretation geophysical combined those case this study, caused by seismic events or anthropogenic activities (explosive firing uranium mining sites like Somaïr Cominak).