Methods of Determination of Stress State in Rock Mass by Blasting
V. N. Tyupin, T. I. Rubashkina
Belgorod State University, Belgorod, 108015 Russia
Keywords: горный массив, напряженное состояние, энергия взрыва, зона раздавливания, зона радиальных трещин, физико-технические свойства, формулы для определения напряжений, достоверность, Rock mass, stress state, explosion energy, squeezing zone, radial fracturing zone, physicotechnical properties, stress formulas, validity
Abstract
The methods for the determination of stress state in rock mass using the energy of explosion are validated. The commercial-scale tests are performed with a view to sizing zones of squeezing and radial fracturing in mines of Priargunsky Mining and Chemical Works. It is found that the fracturing zone radius decreases and the squeezing zone diameter increases with the grater depth of mining operations. The theoretical formulas for calculating stresses depending on sizes of squeezing and fracturing zones, physical and mechanical properties of rocks and detonation characteristics of explosives are obtained. The validity of the formulas is proved in comparison with the method of stress measurement in parallel drill holes at the Antei deposit of Priargunsky MCW. The method of stress determination by blasting is suitable for operational application during heading in mines.
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