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Fig. 3

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Mécanisme de rupture de la fondation du barrage en rive gauche ; le rocher comprimé sous la fondation du barrage a constitué une sorte de « barrage souterrain », aggravant le gradient hydraulique, donc la force d’écoulement.

Mechanism of rupture of the foundation of the dam on the left bank; the compressed rock under the foundation of the dam constituted a kind of “underground dam”, aggravating the hydraulic gradient, therefore the flow force.

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