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Geotechnical Risk Assessment and Geological Origin of Building Fracturation in agadez city(North Niger)

Journal of Environmental & Earth Sciences 2022年第2期4卷 33-44页

作者： Baraou Idi Souley Abdoulwahid Sani Abdoul Wahab Djibo Maiga Moussa Konaté Department of Geology University of AgadezAgadezNiger High Authority for Atomic Energy of Niger(HANEA Niger)OTICENiameyNiger Department of Geology University of NiameyNiameyNiger

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

关键词： Geotechnical risks Geological origin Buildings fracturation Fractures Cracks Faults agadez city Niger

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