Squeeze box in a centrifuge

Abstract

A squeeze box which operates in a centrifuge is presented. In the experimental set-up the centrifugal body force mimics the role of gravity in nature and at the same time drives a hydraulic press which simulates lateral forces. The rate of lateral shortening is controlled by varying the loads placed on the hydraulic press. Utilization of a squeeze box in a centrifuge enhances the range of scaling and enables the use of coherent model materials without violating similitude requirements. In the traditional squeeze box which operates under normal gravity, similitude requirements severely limit the choice of model materials. As a test of the apparatus, simple experiments were carried out comparing models shortened in a centrifuge with similar models shortened under normal gravity. The realistic form of decollement structures e.g., folds, faults and diapirs, shortened in a centrifuge in these tests as well as in other tests which will be reported later, show the potential of this new technique for rigorous modelling of geodynamic systems, which evolve under the influence of both gravity and a push from the rear. The set-up can also be used as a simple shear box in a centrifuge, after a slight adjustment.