TECHNOLOGICAL SOLUTIONS DEVELOPMENT FOR MINING ADJACENT ROCK MASS AND PIT RESERVES TAKING INTO ACCOUNT GEOMECHANICAL ASSESSMENT OF THE DEPOSIT.

Nemova, N. A.; Tahanov, D.; Hussan, B.; Zhumabekova, A.

Purpose. The assessment of options for opening and mining the upper tier of Oleniy Ruchey apatite- nepheline deposits and technological solutions development taking into account geomechanical calculations of open pit slopes and benches stability, both on the marginal contour and when changing the design values of the slope parameters, open pit benches and the stability safety factor to establish the marginal maximum accepted under the condition of the values stability. Methodology. Searching for technological solutions of mining is based on the method of mining and geometric analysis of the deposit upper tier, comparison, generalization, systematization, analytical calculations, 3D parametric modeling, three-dimensional numerical modeling of stress-strain state and the rock mass stability by the finite element method. Findings. According to the research results, the optimal development of mining operations has been proposed for an option providing for the minimum overburden ratio. The parameters of the highwall slopes and their elements on the marginal contour and the development of the deposit are recommended according to the option that provides the maximum possible involvement in the development of the adjacent rock mass and pit reserves mining within the existing limits of the open pit mining tap. Originality. It consists in feasibility evaluation of using a rational technology for the development of mining operations according to the option that provides for the minimum overburden ratio and possible mining development schemes for mining open pit reserves with an assessment of the possibility of internal dumping during the development of an open pit. Practical value. The calculations show that for the conditions of a lying side, the normative factor of the slope stability on the marginal contour can be ensured only if they are bank slopes worked along the weakening surfaces, whose cutting should not be permitted.

STRIP mining; MINING methodology; RESERVES (Accounting); GEOMETRIC approach; ANALYTICAL solutions; SLOPE stability; ISOGEOMETRIC analysis; FINITE element method

Scientific Bulletin of National Mining University, 2020, Issue 2, p17

2071-2227

Academic Journal

10.33271/nvngu/2020-2/017