NUMERICAL MODELING OF THE STRESS-STRAIN STATE OF THE KURZHUNKUL OPEN-PIT MINE
Sedina S.A. Berdinova N.O. Abdikarimova G.B. Altayeva A.A. Toksarov V.N.
2021National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2021#6Issue 450110 - 117 pp.
The stress-strain state of rocks is one of the main factors that determine the magnitude and nature of rock pressure, on which the safety of deep open pit development depends. When conducting mining operations- it is necessary to understand where zones of increased principal components of normal and maximum shear stresses form. The article presents the results of numerical modeling of the stress-strain state of the Kurzhunkul pit in a two-dimensional formulation by the finite element method in the MIDAS GTS NX software package. In mathematical modeling, the stresses actually acting in the array, determined by field measurements, were taken into account. A model based on the results of modeling is presented- which can be used to predict changes in the maximum gradient of horizontal stress with an increase in the depth of mining of the Kurzhunkul open- pit mine. Based on the results of the modeling of the sides in the southeastern north-western directions, areas were identified where there is an unfavorable effect of the maximum shear stresses on the side rock mass and the maximum shear stresses (τmax) may exceed the shear strength. Also, an assessment of the influence of the main components of normal and maximum shear stresses on the stability of the near-rock pit rock mass is given. It has been determined that the geomechanical state of the sides of the Kurzhunkul open-pit mine is characterized by the action of low compressive stresses. The values of the maximum compressive stresses vary from 5.52 MPa to 14.25 MPa. increasing from the day surface to the bottom of the open pit. The minimum component of the principal stresses varies from 0.70 to 9.4 MPa. The values of tensile minimum stresses Omin are significantly less than the calculated values of tensile stresses σp in the sample and do not affect the stability of the pit edges.
a two-dimensional numerical model , pit. distribution of principal stresses , rock mass stability , stress-strain state
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Laboratory “Control of Geomechanical Processes”, D.A. Kunayev Institute of mining, Almaty, Kazakhstan
Laboratory “Rock pressure laboratory”, D.A. Kunayev Institute of mining, Almaty, Kazakhstan
Laboratory for physical processes of georesources development, Mining Institute of the Ural Branch, Russian Academy of Sciences, Perm, Russian Federation
Laboratory “Control of Geomechanical Processes”
Laboratory “Rock pressure laboratory”
Laboratory for physical processes of georesources development
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