Floor stability in the first layer of mine workings when the stope is run through an impact zone of a geological fault

The article discusses specific features of rock pressure manifestation in mine workings of the first layer in the impact zone of a geological fault and the bearing pressure from stoping operations. Factors are defined that cause the occurrence of such phenomena. The issue regarding classification of these phenomena, which are not defined in the "Guidelines for forecasting dynamic phenomena..." is stated. Specific features of the rock pressure are given depending on the structure and physical and mechanical properties of coal in different layers during slice mining of the seam. The experience of monitoring dynamic phenomena and creation of optimal methods to control the floor stability in the first layer of mine workings are described for the stoping operations in conditions of the Kuznetsk coal basin. Results of perennial instrumental survey of the rock mass using the Angel-M system with the electrometric mine equipment function applying the induced electromagnetic radiation method are described, as well as analysis of the seismic situation in the investigated area. A new term is proposed for classification of the recorded dynamic phenomena. A layout of boreholes for directional hydrofrac of the deep-buried rocks above the intermediate drift during the stoping period was designed, which allowed to effectively reduce the negative impact caused by the weight of the poorly caving rocks.