scholarly journals Analysis of activation features of geodynamic processes and formation of impact hazard at Nikolaevsk deposit

2019 ◽  
Vol 129 ◽  
pp. 01019
Author(s):  
Aleksandr Sidlyar ◽  
Boris Saksin ◽  
Marina Potapchuk ◽  
Vitaliy Usikov ◽  
Mikhail Lo-mov
Keyword(s):  
Mathematical Modeling ◽  
Rock Mass ◽  
Strain State ◽  
Acoustic Monitoring ◽  
Structural Features ◽  
Stress Fields ◽  
Joint Analysis ◽  
Safety Measures ◽  
Geodynamic Processes ◽  
The Impact

Based on the results of a joint analysis of seismic-acoustic monitoring data and the geological and structural features of the Niko-laevsk deposit, the main regularities of the formation of technogenic stress fields that determine its impact hazard have been identified. Additionally, using the method of mathematical modeling, a study was done of the stress-strain state of the rock mass taking into account the tectonically ac-tive fault TD-3 and safety measures were proposed to reduce the impact hazard of the rock mass at the Nikolaevsk deposit.

CALCULATION OF THE GEOMECHANICAL STATE OF MINE WORKING SUPPORT AND SURROUNDING ROCK MASS IN CONDITIONS OF MINING ORE DEPOSITS IN EAST KAZAKHSTAN

2020 ◽  
Vol 2 ◽  
pp. 89-97
Author(s):  
Andrey A. Krasnovsky ◽  
Viktor M. Seryakov ◽  
Yuri N. Shaposhnik ◽  
Denisi A. Shokarev
Keyword(s):  
Rock Mass ◽  
Mine Working ◽  
Strain State ◽  
Ore Deposits ◽  
Surrounding Rock ◽  
Stress Fields ◽  
Uniform Pressure ◽  
Stress Strain ◽  
East Kazakhstan ◽  
Geomechanical State

The statement of the problem of determining the stress-strain state of support and rock mass around the mine working in unstable rocks, in case of voids filling with phenol resins is proposed. The initial parameters used in the calculations correspond to the conditions of mining ore deposits in East Kazakhstan. The distribution character of stress fields in the support and their change depending on geometric sizes of the area filled with phenol resins is determined. It is shown that using phenol resins causes formation of a uniform pressure of surrounding rocks on the arch part of the support and facilitates an increase in its stability.

MONITORING THE STABILITY OF VERTICAL SHAFT FOR POTASSIUM MINES

2020 ◽  
Vol 3 (1) ◽  
pp. 304-317
Author(s):  
N.M. KACHURIN ◽  
◽  
I.A. AFANASIEV ◽  
V.S. PESTRIKOVA ◽  
P.P. STAS ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Rock Mass ◽  
Strain State ◽  
Theoretical Studies ◽  
Vertical Shaft ◽  
Support Material ◽  
Safe Operation ◽  
Predictive Assessment ◽  
The Stability ◽  
Experimental And Theoretical Studies

As a result of experimental and theoretical studies, the regularities of the interaction of vertical shafts of potash mines with the rock mass were clarified, which allows predictive assessment of the consequences of violations of construction geotechnology projects and to develop effective measures to restore lining and ensure safe operation of shafts. At the same time, during the construction of vertical shafts, deviations from projects occur without modeling the possible consequences of such violations of projects. However, for a predictive assessment of the consequences of violations of construction geotechnology projects and the development of effective recommendations for the restoration and ensuring the safe operation of shafts, it is necessary to use a system of control and measuring monitoring of the support material, and mathematical modeling of its stress-strain state.

scholarly journals Mathematical modeling of tight roof periodical falling

2018 ◽  
Vol 60 ◽  
pp. 00020 ◽  
Author(s):  
Vira Prykhodko ◽  
Nataliia Ulanova ◽  
Oleksandr Haidai ◽  
Dina Klymenko
Keyword(s):  
Mathematical Modeling ◽  
Rock Mass ◽  
Boundary Element Method ◽  
Coal Seam ◽  
Mine Working ◽  
Strain State ◽  
Stress And Strain ◽  
Mine Workings ◽  
Roof Falling ◽  
Enclosing Rocks

The paper proposes a method to determine of a coal seam roof falling step basing upon the analysis of stress and strain state of the rock mass area with mine workings formed as a result of coal preparatory and extraction operations. A boundary element method has been applied to define stress and strain state (SSS). Fissuring of enclosing rocks was modeled by means of transversal-isotropic medium. Dependence of destructed rocks zone height within the roof of a seam being mined upon the weakening of the rock mass due to its fissuring and mine working geometry has been determined. Effect of fissility on the periodical roof falling step has been studied. Changes in support loads in the process of stope advance have been determined. A scheme of partial backfilling of the worked out area has been proposed to maintain the support in its working order.

scholarly journals Substantiating the optimal type of mine working fastening based on mathematical modeling of the stress condition of underground structures

2021 ◽  
pp. 57-63
Author(s):  
A.K Matayev ◽  
V.H Lozynskyi ◽  
A Musin ◽  
R.M Abdrashev ◽  
A.S Kuantay ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Rock Mass ◽  
Mine Working ◽  
Strain State ◽  
Processing Plant ◽  
Underground Structures ◽  
Stress Strain ◽  
Initial Stress Field ◽  
Stress Strain State ◽  
Mine Workings

Purpose. Predicting the formation of a stress-strain state (SSS) in the rock mass within the boundaries of influence of stope operations on the horizon -480 m in axes 2028 at the 10th Anniversary of Kazakhstans Independence (DNK) Mine. Methodology. An engineering-geological data on the host rocks properties are analyzed based on the international ISRM standard. Numerical modelling of the rock mass stress-strain state and the calculation of the load-bearing capacity of the compound support (roof-bolt+shotcrete+mesh) and arch support used at the mine are performed with the help of the RS2 software. This program, based on the Finite Element Method in a two-dimensional formulation, makes it possible to take into account a significant number of factors influencing the rock mass state. Findings. The calculations performed indicate that the support resistance is incommensurably low in comparison with the values of the initial stress field components in the rock mass. In such conditions, it may be more effective to strengthen the mass in the vicinity of mine working than setting more frames or using more massive support profiles. Originality. The paper presents the results of mathematical modeling and calculation of the stress-strain state of the underground supporting aquifer rock mass structures developed for complex mining-and-geological and geomechanical conditions of driving, supporting and operating mine workings on deep horizons of the mines at Donskoy Ore Mining and Processing Plant. Based on the performed research, the preliminary (advanced) strengthening of the border rock mass in the zone of inelastic (destructive) deformations has been substantiated, as a priority method to control the stability of mine workings. Practical value. The research results can be used when creating a geomechanical model of the field and designing stable parameters of mine working support.

scholarly journals EFFECT OF ORIGINAL STRESS STATE OF THE ROCK MASS ON DISTRIBUTION OF DISPLACEMENTS AND STRESSES IN THE VICINITY OF SUPPORTED MINE WORKING IN UNSTABLE ROCKS

2020 ◽  
Vol 2 ◽  
pp. 82-88
Author(s):  
Andrey A. Krasnovsky ◽  
Viktor M. Seryakov
Keyword(s):  
Gravitational Field ◽  
Rock Mass ◽  
Mine Working ◽  
Strain State ◽  
Stress Fields ◽  
Compressive Stresses ◽  
Vertical Support ◽  
Original Field ◽  
Arch Support ◽  
Mine Roof

The statement of the problem of finding the stress-strain state of support and rocks surrounding the mine working in case of cushioning with phenol resins is used to determine the peculiarities of its formation under the influence of gravitational and hydrostatic original stress fields. It is found that maximum vertical compressive stresses arise in vertical support units at gravitational field, which exceed by half their values for a hydrostatic field. However, as the height in the mine roof filled with phenol resins increases, maximum vertical stresses for both options become comparable. In arch support units at hydrostatic original state of the rock mass, the values of horizontal tensile stresses are by half less than at gravitational original field.

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