๐๐๐ค๐ฉ๐๐๐๐ฃ๐๐๐๐ก ๐๐๐จ๐ ๐ผ๐จ๐จ๐๐จ๐จ๐ข๐๐ฃ๐ฉ ๐๐ฃ๐ ๐๐๐ค๐ก๐ค๐๐๐๐๐ก ๐๐ง๐๐๐๐ฃ ๐ค๐ ๐ฝ๐ช๐๐ก๐๐๐ฃ๐ ๐๐ง๐๐๐ฉ๐ช๐ง๐๐ฉ๐๐ค๐ฃ ๐๐ฃ ๐ผ๐๐๐๐๐ฏ ๐พ๐๐ฉ๐ฎ (๐๐ค๐ง๐ฉ๐ ๐๐๐๐๐ง)
Geotechnical Risk Assessment and Geological Origin of Building Fracturation in Agadez City (North Niger)
Article ID: 4697
DOI: https://doi.org/10.30564/jees.v4i2.4697
Abstract
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 Aรฏr Mountain. The 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 implemented. Statistical 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 fracturation. Indeed, the buildings made from cement are more easily fractured than buildings made from clay materials. Statistical 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 city. The 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 Somaรฏr and Cominak).
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