Assesment of localization of free gas accumulations in marginal part of the displacement trough

Abstract

The development of the Starobinskoye potash salt deposit is associated with the danger of occurrence of gas-dynamic phenomena in the form of sudden and initiated outbursts of salt and gas, roof rock collapses and bed rock destruction. In this paper, mathematical modeling methods were used to evaluate changes in the stress-strain state during the excavation of the
development heading along the lower silvinite formation of the I potash horizon under conditions of its underworking and overworking. Mine on-site studies of the distribution of gas content and gas dynamic characteristics of bed rocks of the lower silvinite stratum of the I potash horizon have been carried out. Based on the modeling results, possible localization areas of fracturing, stratification, and free gas accumulations have been identified, confined to the marginal part of the displacement trough. Within these zones, mine on-site studies have shown abnormally high values of the gas dynamic characteristics of the bed of the lower silvinite formation of the I potash horizon. The current mining situation in certain conditions determines the potential danger of gas-dynamic phenomena associated with the destruction of the rocks of the mine workings and accompanied by intense gas emission.