Model study of strength and stability of inter-chamber concrete piers

Abstract

In the underground development of non-ferrous metal deposits quite often ore inter-chamber pillars are replaced by artificial usually concrete “pillars” - supports to achieve the most complete extraction of rich ores, to get the opportunity to use high-productive methods of ore stripping both in the chambers and in the mining of pillars. From the point of view of reducing the cost of ore, the thickness of supports and the strength of concrete should be as small as possible. At the same time, the concrete supports should be strong and stable enough until the end of ore extraction operations, and sometimes for a longer period of time. Therefore, choosing the optimum dimensions of concrete supports is very important and responsible. However, there is still no definite methodology for calculating the parameters of concrete piers. Their sizes and concrete strength grades are usually determined on the basis of practice data.