During their lifetime, tunnels are subjected to significant deformations mostly due to « burst behaviour » of the ground and the convergence to the tunnel after the excavation.

A set of inflatable circular seals for measuring deformation of a tunnel over a period of time.

As part of the dissertation at LMDC (Laboratory Materials and Durability of Constructions) and under the supervision of Messrs. Sellier and Vidal, Mr. Manzoni developed specific models of tunnel cross sections which were subjected to mechanical stresses in order to study the long term behaviour of tunnels under different conditions, and specifically those subjected to earthquakes. To this end, Pronal was asked to develop and supply a complete system with inflatable circular seals, a pump with a regulator and various tools and accessories. The goal ? Measurements of concrete tunnel deformations caused by ground shifting.

Vérin gonflable torique - maquette

Inflatable circular seals to analyze the behaviour of concrete

During the first test, radial pressure was applied to simulate a homogeneous convergence of the soil. The second test makes it possible to apply selective forces to the concrete model in order to study the effect of uneven thrust. The inflatable circular seal supplied by Pronal for this purpose are inflated to a pressure 35 bar. The tests are running for 6 months at an ambient temperature of 20-40 C and air humidity of 50%.

vérin gonflable torique
Système de gonflage
Custom
implementation
Evenly
distribued thrust
High inflation
pressure

Data from these tests make it possible to optimize the methods used to calculate the deformation of a tunnel under different conditions. These simulations also make it possible to make recommendations for planning and operation of tunnels.

Vous souhaitez plus d'informations sur ce projet ?

Vous pouvez contacter nos experts qui sont adeptes de ce genre de projet pour avoir plus d’informations et être conseillé

COOKIES
Nous utilisons des cookies pour vous permettre de visiter et d'utiliser notre site. Certains cookies sont nécessaires à son fonctionnement et ne peuvent pas être désactivés. D'autres cookies de collecte de données nous aident à améliorer la pertinence de notre contenu. Ces cookies ne sont activés que si vous consentez à leur utilisation en cliquant ci-dessous.
Accepter
Ces cookies permettent de suivre le parcours utilisateur, le passage sur un site pour une évaluation et une stratégie marketing.
Ces cookies permettent d'obtenir des statistiques de fréquentation anonymes du site afin d'optimiser son ergonomie, sa navigation et ses contenus.
Tout refuser