Initial stress-strain state of the Yugo-Zapadnaya mine lower horizons (the Darasunsky deposit)

The article presents the study of the initial stress-strain state of the Yugo-Zapadnaya mine lower horizons, the Darasunsky gold deposit. The aim of the study has been to clarify the geotechnical conditions ensuring mining safety. A series of rock pressure monitoring stations have been installed, and in-situ measurements have been made using a slot discharge method based on the IGD UB RAS technique (segmented-slot version copyright). The rock samples taken at the stations' sites have been tested for their strength and elastic properties following the requirements of the standards of the Russian Federation. The inverse geo-mechanical problem-solution method based on the registered rock pressure manifestations has allowed reconstructing the stressed rock mass state in potentially bump-hazardous sections of the mine rock mass. The gravitational and tectonic components of the in-situ stress field have been calculated. The results have been compared with the ones previously obtained for the average conditions of the Darasunsky deposit. Based on the research results, the gravitational-tectonic nature of the pre-mining stress-strain state of the rock mass of the Darasunsky field has been confirmed. At the same time, it has been found that the pre-mining stress field is discretely dispersed: there are localized high-stress areas where dynamic stress manifestation is probable, medium-stress areas without visible manifestations of rock pressure, and unloaded sections of the marginal rocks mass. For the engineering geotechnical calculation purposes, a differentiated assessment of the initial stress-strain state has been suggested. It is recommended that the stress be calculated for specific mining and geological conditions, based on the specified relations of the initial stress distribution.

initial stress-strain state, rock mass, gravitational and tectonic stress components, physical and mechanical rock properties, geotechnical conditions, dynamic rock pressure manifestation

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