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FAILURE MECHANISMS OF UNDERGROUND STRUCTURES DURING EARTHQUAKE: AN OVERVIEW
Session: Earthquakes and Geohazards II / Séismes et géoaléas II
Ahmed Mahmoud, Sherbrooke University (Canada)
Mahmoud Hussien, Sherbrooke University (Canada)
Mourad Karray, Sherbrooke University (Canada)
Mohamed Chekired, Hydro-Québec (Canada)
C. Bessette, Hydro-Québec (Canada)
L. Jinga, Hydro-Québec (Canada)
Geotechnical structures buried near the ground surface have a wide range of applications, from small-scale pipelines such as means of gas transmission, telecommunications, water supply, and sewerage pipelines, to large-scale structures including tunnels for various transportation systems. This paper provides an overview of the current understanding of the failure mechanisms of these structures due to earthquake loadings. Based on post-earthquake investigations, experimental laboratory data as well as numerical simulations of underground structures conducted in the current study by means of computer code, FLAC, it was found that movement of ground at seismic load may cause serious damage to those infrastructures. These serious damage is represented in two main types of failure has been occurred. First, stress-strain failure of the underground structure due to extra-stress and extra-deformation which as a result of soil movement at seismic. Second, state the stress failure of soil which lead to an uplift of underground structures and collapse of surround soil then disconnection of pipe joints between buried structure and tubes.
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