In the practice of construction and operation of mines, shafts and underground structures one of the urgent tasks is the calculation of pillars. Its solution is complicated by a variety of types of pillars and conditions of their operation. The nature of operation of inter-chamber pillars depends on a number of parameters, the most important of which, other things being equal, are: the structure of pillars, the properties of the rocks composing them, the mining depth , the type of links between pillars and the host rocks, the ratio of pillar sizes, etc.