ASPECTS OF SAFE CONDUCTION OF MASS EXPLOSIONS DURING PILLARS CAVING IN THE CONDITIONS OF UNDERGROUND MINES IN THE PERMAFROST ZONE
For the conditions of underground mining in the permafrost zone, the paper considers the very topical issue related to ensuring the safety of workers and the safety of equipment - definition of the boundaries of the danger zone according to the criterion of the action of a shock air wave during the mass caving of pillars for various purposes under conditions of constant low temperatures in mine workings. Taking into account the experience of mining reserves of similar deposits in the north of the Russian Federation and far abroad, it determines the characteristic mining and technical conditions for conducting mass explosions - the traditional exploration order of ore body reserves and the parameters of structural elements of chamber mining systems at the time of extraction of the main reserves of blocks. Based on a typical example of mass caving of interfloor and rib pillars in the conditions of the Vetrensky mine, we established the dependence of excess pressure at the front of a shock air wave on the distance from the place of the mass explosion. Taking into account the conditions for conducting mining operations in the permafrost zone, the absence of mine workings support and the features of the propagation of a shock air wave at low temperatures, the authors propose to take into account, when determining the over pressure at the front of a shock air wave, its two-fold increase in determining the size of the danger zone for this factor.