Destruction of rocks by the non-explosive depleting compounds during mining

摘要

Purpose. Justification of the possibility of non-explosive coherent rocks destruction while carrying out stratal undergroundudmine workings on the basis of the set of dependencies describing changes in physical and mechanical propertiesudof the non-explosive depleting compounds (NDC) during hydration process in the blast-hole charges in relationudto crack growth in the adjacent area.udMethods. By conducting experiments on the unequal component triaxial compression unit, we obtained the dependenceudof changes in the physical and mechanical properties of the NDC on the hydration time and the relationshipsudbetween the physical and mechanical properties. The required distance between the blast-holes with NDC was establishedudanalytically for non-explosive destruction by quasi-static pressure of the compound expansion.udFindings. The study allowed to obtain empirical dependences of medium stress change, coefficient of transverseudstrain, strain modulus of the NDC for compound expansion in time. The dependence of the strain modulus of theudNDC on medium stress has been established. The research resulted in the analytical dependence of the length of theudcrack progressing from the blast-hole walls into the massif depth while implementing non-explosive technologies ofuddestruction on the compound expansion pressure, its elastic constants as well as physical and mechanical characteristicsudof the medium under destruction.udOriginality. Medium stresses caused by the NDC expansion grow in time similarly to the growth of the stressudtensor components, the dependence of the strain modulus on average stresses being satisfactorily described by anudexponential dependence.udPractical implications. The results of experimental and theoretical studies, taking into account sufficient accuracyudfor practical applications, can be used to determine parameters of the quasi-static rocks breaking by non-explosiveudcompound during stratal mining.