Abstract
The static stability of excavations in rocks is studied by the method of centrifuged models. The models consist of mixtures of cement, plaster of Paris, lime, sand and magnetite powder in various proportions such as to change the density and strength of the structures. Models weighing up to 1.5 kg may be run in our centrifuge at a centripetal acceleration up to 3,000 g, Under the body force corresponding to this strong acceleration, models of materials with considerable strength would collapse and thus reproduce the unstable behaviour of much bigger mines, tunnels and other cavities which collapse under the weight of the rocks. The chief intent of the paper is to point out the great potentialities of the centrifuged model method in rock mechanics.
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