EXPERIMENTAL DETERMINATION OF THE PARAMETERS OF THE STRESSED STATE OF THE ADJACENT ROCK MASS NEARBY THE OPEN PIT WALL: “VOSTOCHNY” QUARRY OF THE OLIMPIADINSKOE GOLD DEPOSIT

Abstract

The stressed state of the rock mass nearby the Vostochny open-pit, Olimpiadinskoe gold deposit, has been studied with loading-out methods in the end-face measurement variant of three observing stations within a engineering-geological block.
The studies have shown that the field of acting stresses is one of the gravitational-tectonic type. The maximum component of the main stresses is subhorizontal and acts in the zone of influence of the open-pit excavation parallel to the open-pit contour.
Reconstruction of the direction of stresses acting outside the zone of influence of open-pit excavation has been performed on the basis of the comparison of research data, and evidences the subequal component compression of the rock mass in the horizontal plane.
The vertical stresses are determined by the weight of the overlying rocks. The disturbance of the out-boundary rock mass, fixed by television control methods of wells and ultrasonic logging have shown a zone of increased technogenic fracturing. But in general, it is possible to characterize the common fracturing as moderate. In order to clarify conclusions about the parameters of acting sub-horizontal stresses outside the career excavation in intact area it is useful to carry out in the future measurements within all allocated engineering-geological blocks of the open pit "Vostochny".