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In underground work it is necessary to ensure that the space excavated is kept stable and with the planned cross section, during the excavation work as well as after the commissioning of the work, by working on the ground to increase its self-supporting capacity (using injections and drainage, etc.). If this is not viable, then elements are set up to support the stresses exerted by the ground on the excavation's environment. Guniting and bolting are amongst possible solutions and in special cases metallic props, umbrellas or forepoles, Bernold plates, etc., are used.
