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EVALUATION OF CONSTRUCTIVE ELEMENTS STABILITY IN FIELD DEVELOPMENT SYSTEMS IN TERMS OF INTERRELATION OF DYNAMIC ACOUSTIC PROPERTIES AND ROCK RESIDUAL STRENGTH

Оценка устойчивости конструктивных элементов систем разработки месторождений полезных ископаемых по взаимосвязям динамических акустических характеристик с остаточной прочностью горных пород
EVALUATION OF CONSTRUCTIVE ELEMENTS STABILITY IN FIELD DEVELOPMENT SYSTEMS IN TERMS OF INTERRELATION OF DYNAMIC ACOUSTIC PROPERTIES AND ROCK RESIDUAL STRENGTH The research is related to forecasting of rock breaking and safety of operations in geo-environments. It is necessary to evaluate constructive elements stability in field development systems such as pillars and roof of underground mining as well as solid mass around tunnels and underground facilities. The evaluation is done by determining and further forecasting of residual strength of these elements in time. Presently there are no nondestructive methods of determining this value in the solid mass. The research studies such interrelations between residual strength and dynamic acoustic properties as attenuation coefficient, decrement, and coefficient of merit. The final task is to determine correlation between acoustic merit and relative function of residual strength of various rock idiotypes, as well as evaluation with the received dependencies of residual strength of constructive elements in field development systems. It will allow forecasting of engineering structures lifetime without distracting them. The picture shows interdependence of acoustic merit and strength for limestone. It was received on samples. The peculiarity of such dependence is declining of residual strength with decline of Q merit. Q value is heavily impacted by geomaterial fracturing. Q drops dramatically even with little fracturing while strength declines quite a little. This allows forecasting destruction at an early stage. In mining structures which need lifetime assessment, are pillars and roof of underground mining structures, and open-pit sides. Q merit is determined with seismic or acoustic methods. Then with the help of earlier determined dependence, residual strength of the studied element or whole construction is determined. Monitoring during a certain period of time allows forecasting their lifetime.


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