That is why it is necessary to determine the causes of dynamic phenomena in the rock mass and their impact on the loads of arch support. Moreover, it is necessary to study dynamic load of double timber and its consequences, that is the effects of these loads in the support. Keywords: support, dynamic. К содержанию №2. УДК 622.232
hard alloy that offers the prospect of its application in the manufacture of cutting, drilling tool, punching tools and working under dynamic conditions. Keywords : mechanochemical synthesis, tungsten carbide, hard alloy, cutting plates, performance characteristics