Predicting the stress-strain state of a massif at the stage of creating a protective cover in the conditions of developing iron ore deposits under water-bearing strata

Abstract

The methods of developing iron ore mines under water-bearing strata without draining the covering stratum are analyzed. To exclude water breakouts into the mine openings during development, a protective cover is made. The stress-strain state of the ore massif at the stages of creating the protective cover and development of the first tier has been studied. The stress-strain state for two variants of creating and excavating the first tier has been studied. In the first variant, a protective cover is first created, and then the first tier is developed. In the second variant, the cover is created, and the tier is developed simultaneously. The regularities have been found in the distribution of vertical stress coefficients in the ore massif and of the limit state zones around the excavations in the first tier.