Sakhno I. Scientific bases of mine rock state control by non-explosive destructive mixtures in underground mining

The dissertation is dedicated to the solution of an urgent scientific problem of mine rock control by non-explosive destructive mixtures (NDM) in underground mining. On the basis of theoretical, laboratory, industrial and experimental research regularity of a strain-stress state through the use of non-explosive destructive mixtures for mine rock state control is determined with due regard for the kinetics of their hydration in blast-hole and borehole charges in time spans, the charge construction, the impact of technological physical processes. As the result of the carried out investigation the regularity of transient processes formation in non-explosive destructive mixtures in time spans are first determined depending on the "NDM - massif" system properties. Special features of cracking around the borehole by NDM are revealed and a destruction model is developed with regard for the existing strain field. The mechanism of mine rock directed destruction by NDM is considered. The regularity of critical stress formation in the main roof is determined depending on the change in the rock cantilever length in the open goaf and on the protective construction rigidity. The methods of determining the parameters of mine rock destruction in underground workings by means of NDM are worked out. Specification documents are worked out and approved. The total annual effect due to the implementation of the recommendations made 1.46 mln UAH.