Comptes Rendus
The influence of confinement on the bearing capacity of strip footings
Comptes Rendus. Mécanique, Volume 330 (2002) no. 5, pp. 319-326.

The bearing capacity for a strip footing acting on a soil foundation with rigid boundaries at a finite distance is investigated within the framework of the Yield design theory both for a purely cohesive soil and for a frictional soil. It is shown that the analysis can be performed simply by referring to already existing results concerning the bearing capacity of a strip footing on a soil layer with limited thickness. Each bearing capacity factor in Terzaghi formula is increased by a factor that increases when the distance of the rigid boundary to the edge of the footing decreases. The bearing capacity is proved to be the more sensitive to this confining effect as the friction angle of the soil increases. From a physical point of view this theoretical analysis would show that, when effective, confinement reduces the depth of the soil layer involved in the collapse mechanism.

On étudie la force portante d'une fondation superficielle sur un demi-espace limité horizontalement par des parois rigides. On se place dans le cadre de la théorie du calcul à la rupture. On montre que l'analyse peut être menée simplement à partir des résultats déjà existants au sujet de la portance d'une fondation sur une couche de sol d'épaisseur limitée. Chaque coefficient dans la formule de Terzaghi est multiplié par un facteur qui croit quand la distance de la paroi rigide au bord de la fondation diminue. Cet effet de confinement est d'autant plus sensible que l'angle de frottement du sol est grand. Du point de vue physique cette analyse théorique prouverait que le confinement a pour effet de réduire la profondeur de la couche de sol impliquée dans le mécanisme de ruine.

Received:
Accepted:
Published online:
DOI: 10.1016/S1631-0721(02)01459-6
Keywords: soils, bearing capacity, confinement, foundation, Terzaghi, yield design
Mot clés : sols, calcul à la rupture, fondation, force portante, Terzaghi

Jean Salençon 1

1 École polytechnique, Laboratoire de mécanique des solides, 91128 Palaiseau cedex, France
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Jean Salençon. The influence of confinement on the bearing capacity of strip footings. Comptes Rendus. Mécanique, Volume 330 (2002) no. 5, pp. 319-326. doi : 10.1016/S1631-0721(02)01459-6. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/S1631-0721(02)01459-6/

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