DEVICE FOR DETERMINING THE MAGNITUDE AND DIRECTION OF STRESSES IN MINE SUPPORTS

摘要

Containers 1, made of material which is flexible to a limited extent, are arranged between a mine support structure and the rock and are filled with flowable material. A weakened location 3 or an overpressure valve may be provided. The container may have separate chambers 2. The forces acting on the support structure are revealed by the kind of deformation to which the containers are subjected by those forces.