Forecast of the mine workings destruction risks by the radiometric control method

Abstract

The stress-strain state of the rock mass affects the content of methane gas and radon aerosols in the atmosphere of mine workings. Therefore, combined control of methane gas and radon in mine workings allows us to monitor changes in the state of the rock massif and to take measures in proper time to reduce the risks of the roadway destruction. Forecasting of rock massif and mine roadway dangerous state is based on the determined features of methane gas emission together with radon decay products into the mine roadways radon decay products. Interdependence between the dynamics of changes in the concentration of methane gas and the normalized concentration of radon is established when range of the deviations from the average value is ± 20%. Abrupt spikes at the range above 40% are explained in prone-to-destruction zones of the rock massif. One of the indicators of the rock massif readiness for dynamic manifestations of rock pressure and the destruction of mine roadways can be a decrease in the concentration of radon decay products Po218 below 5%.

Regularities of rocks zonal disintegration and methane emissions periodicity in mine roadways

“…Poliakov Institute of Geotechnical Mechanics NASU, in which an analytical description of the stress-strain state of the rock massif near the mine longwall [11][12][13] is given, including taking into account: free gas in the rock formation, water saturation, cracks and geological disturbances [13,14], extreme deformation of rocks [11,15]. A model has been developed for the formation of pore-fractured area in sandstones under the influence of natural and technogenic factors [15,18], which is verified by numerous experiments in mines, as well as for the underground geotechnical systems of geomechanical monitoring [19,20] and radiometric control methods [19]. At the same time, the interconnected problems of the rocks massif destruction during mining and forecasting gas emissions in the mine roadways are extremely difficult and do not have a final solution.…”

Forecasting the risks of underground roadway stability loss based on mine research data

“…The use of risk control technologies at mining enterprises is hampered by insufficient development of systems for automatic monitoring and control of mining processes [2]. The imperfection of the methods for analyzing and assessing risks caused by hazardous factors arising in the production environment has a negative impact [3]. Algorithms for determining the stress-strain states of the rock massifs require further development [4][5][6].…”