scholarly journals Development of methods for assessing the mine workings stability

2020 ◽  
Vol 201 ◽  
pp. 01040
Author(s):  
Arstanbek Abdiev ◽  
Rakhat Mambetova ◽  
Aziz Abdiev ◽  
Sher Abdiev
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Surface Relief ◽  
Experimental Studies ◽  
Geological Structure ◽  
State Assessment ◽  
Mining Operations ◽  
Research Results ◽  
Mine Workings

This paper studies the rock mass stress state under highland conditions, depending on the geological structure of a particular rock mass area, the tectonic field of stresses and the region relief. This study is aimed to develop an experimental method for assessing and monitoring the properties and state of the rock mass adjacent to mine workings. Experimental studies are performed through stresses measurements in-situ. Based on research results, it has been revealed that the geological structures, tectonic fields of stresses and the earth’s surface relief of the deposit normally reflect the values and direction of the main stresses acting in the mass. These patterns can be used to predict and assess the stress state of the rock mass. During the mass stress state assessment, quantitative dependences have been obtained for determining the stress tensors conditioned by the overlying rocks weight, tectonics and fracturing, and the deposit surface relief The research results make possible to assess the nature of the stresses distribution, to identify the areas of reduced, equal, increased and maximum stresses concentration of the virgin mass, as well as to increase the efficiency of the geoacoustic control developed by the authors for the state of the mass adjacent to mine working. According to the new patterns and dependences obtained, the values and directions have been scientifically determined of the main stresses action, as well as the zones of stresses manifestation. These patterns and dependences are valuable for designing and planning the development of mining operations.

scholarly journals Research into the moisture influence on the physical-chemical tuff-stone characteristics in basalt quarries of the Rivne-Volyn region

2020 ◽  
Vol 201 ◽  
pp. 01036
Author(s):  
Yevhenii Malanchuk ◽  
Valerii Korniienko ◽  
Larisa Malanchuk ◽  
Vitalii Zaiets
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Surface Relief ◽  
Experimental Studies ◽  
Geological Structure ◽  
State Assessment ◽  
Research Results ◽  
Moisture Influence ◽  
Stone Characteristics

This paper studies the rock mass stress state of deposits under highland conditions, depending on the geological structure of a particular rock mass area, the tectonic field of stresses and the region relief. This study is aimed to develop an experimental method for assessing and monitoring the properties and state of the rock mass adjacent to mine workings. Experimental studies are performed through stresses measurements in-situ. Based on research results, it has been revealed that the geological structures, tectonic fields of stresses and the earth’s surface relief of the deposit normally reflect the values and direction of the main stresses acting in the rock mass. These patterns can be used to predict and assess the stress state of the rock mass. During the rock mass stress state assessment, quantitative dependences have been obtained for determining the stress tensors conditioned by the overlying rocks weight, tectonics and fracturing, and the deposit surface relief The research results make possible to assess the nature of the stresses distribution, to identify the areas of reduced, equal, increased and maximum stresses concentration of the virgin rock mass, as well as to increase the efficiency of the geoacoustic control developed by the authors for the state of the rock mass adjacent to mine working.

Landslide stabilization experience in Urtui open pit mine

2021 ◽  
pp. 102-106
Author(s):  
O. A. Isyanov ◽  
◽  
D. I. Ilderov ◽  
V. I. Suprun ◽  
S. A. Radchenko ◽  
...  
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Geological Structure ◽  
Stability Control ◽  
Open Pit Mine ◽  
Open Pit ◽  
Open Pit Mining ◽  
Coal Seams ◽  
Mining Operations ◽  
Early Access

Instability of pit wall slopes is the most critical accident in open pit mining. The risk of damages to pit walls is proportional to the height of exposed surfaces and to the time of exposure. Among many factors governing pit wall stability, the major factor is geological structure and weakening zones in rock mass. Deformation processes are initiated in host rock mass of coal seams mostly because of undercutting of weak interlayers. Alongside with local undercutting, another cause of landslides is transition of coal mining from down-dip extraction to up-dip extraction. The sequence of mining and morphology of weak interlayers also have influence on initiation and evolution of deformations. The basic component of engineering solutions on pit wall stability control is optimization of mining sequence and methods of accessing working horizons in open pit mines. Large-scale deformation of Western and Southeastern pit walls in Urtui mine could be avoided using the optimized sequence of mining operations. For example, mining advance mostly along the curve of the Urtui centroclinal fold, with early access and destress of the eastern and, first of all, western wings of the fold could make it possible to evade from up-dip mining of coal seams and, as a consequence, to solve the major geomechanical problems in the open pit mine.

scholarly journals Management of geomechanical processes - the basis for selecting the optimal technologies for the development of mineral deposits

2018 ◽  
Vol 56 ◽  
pp. 02005
Author(s):  
Anatolii Kozyrev ◽  
Iuliia Fedotova ◽  
Eduard Kasparyan
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Rock Massif ◽  
Mineral Deposits ◽  
Mining Operations ◽  
Mining Technology ◽  
Geomechanical Monitoring ◽  
Gas Dynamic ◽  
Natural Stress ◽  
Mining Methods

When carrying out mining operations, a rock massif responds to technological impacts in the form of developing strains and fractures. Under certain conditions, this response occurs as dynamic and gas dynamic destructions of rocks with intensive release of energy, which creates threats to security and disrupts a working technology. To substantiate the optimal mining technology, which would be maximum adequate to the specific geological and geomechanical conditions of a deposit development, it is necessary to organize a comprehensive monitoring of geomechanical processes in rock massifs. The paper considers general principles to organize the geomechanical monitoring under conditions of the hierarchically-blocked rock massifs in the gravitational-tectonic field of the natural stress state. The authors give main recommendations for managing geomechanical processes in the rock mass for various mining methods.

In situ stress state assessment in the Nurkazgan Mine

2013 ◽  
Vol 49 (4) ◽  
pp. 550-556 ◽  
Author(s):  
A. V. Leont’ev ◽  
A. B. Makarov ◽  
A. Yu. Tarasov
Keyword(s):  
Stress State ◽  
In Situ Stress ◽  
State Assessment

scholarly journals Investigation of stress field parameters at deep horizons of the Gayskoye field**

2020 ◽  
Vol 192 ◽  
pp. 01028
Author(s):  
Sergey Sentyabov ◽  
Albert Zubkov
Keyword(s):  
Rock Mass ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Strength Properties ◽  
Concrete Lining ◽  
Complex Structures ◽  
Mining Operations ◽  
Volumetric Expansion ◽  
Shaft Lining ◽  
The Stability

The extraction of solid minerals is associated with the penetration of man into the subsoil by creating either relatively simple or extremely complex structures. All mining operations can be safely and efficiently carried out only on the basis of calculating the stability of these structures, which is based on knowledge of the physical and mechanical properties, the stress state of the rock mass and the patterns of their redistribution and formation in mountain structures. The presented studies confirmed the regularities of the formation of natural stresses in the rock mass, which is the sum of gravitational, static tectonic and variable components, which are formed as a result of uniform periodic volumetric expansion and contraction of the Earth. The problem of shaft stability is due to the need to solve problems to determine the level of stress-strain state and strength properties in concrete lining. The parameters of stresses in the shaft lining and monitoring of their changes were determined using the method of measuring unloading deformations. When analyzing the stresses obtained experimentally by analytical means in the concrete lining of mine shafts, a connection was established with the results of measurements in the rock mass on the basis of 50 meters. Based on the experiment, it was confirmed that theoretical and experimental studies prove that a hierarchically blocky massif of magmatic and metamorphic rocks behaves as an elastic and isotropic medium and changes in natural stresses in the massif Δ on the basis of 5-7 ranks of geoblocks, on the contour of the trunk based on 2 –3 ranks of geoblocks and in the concrete lining of mine shafts Δσb obey this law.

scholarly journals Dynamic Analysis for the Hydraulic Leg Power of a Powered Roof Support

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5715
Author(s):  
Dawid Szurgacz
Keyword(s):  
Rock Mass ◽  
Theoretical Analysis ◽  
Dynamic Analysis ◽  
Experimental Studies ◽  
Geological Structure ◽  
Basic Element ◽  
Bench Test ◽  
Dynamic Power ◽  
The Impact ◽  
Roof Support

This paper presents the results of a study conducted to determine the dynamic power of a hydraulic leg. The hydraulic leg is the basic element that maintains the position of a powered roof support. It is located in the structure between the canopy and the floor base. The analysis assumes that its power must be greater than the energy of the impact of the rock mass. The energy of the rock mass is generated by tremors caused mainly by mining exploitation. The mining and geological structure of the rocks surrounding the longwall complex also have an influence on this energy generation. For this purpose, stationary tests of the powered roof support were carried out. The analysis refers to the space under the piston of the leg, which is filled with fluid at a given pressure. The bench test involved spreading the leg in the test station under a specified pressure. It was assumed that the acquisition of dynamic power would be at the point of pressure and increase in the space under the piston of the leg under forced loading. Based on the experimental studies carried out, an assessment was made with the assumptions of the methodology adopted. The results of the theoretical analysis showed consistency with the experimental results.

Studies of the Stress State of the Coal Pillar between the Treatment andPreparatory Workings by the Methods of Deformable Body Mechanics

2020 ◽  
pp. 26-31
Author(s):  
N.V. Cherdantsev ◽  
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Coal Seam ◽  
Solid Mechanics ◽  
Boundary Integral Equations ◽  
Coal Pillar ◽  
Boundary Integral ◽  
External Boundary ◽  
Mining Operations ◽  
Coal Rock

To ensure safe conditions for mining operations and increase labor productivity, a reliable assessment of the stress state of the coal-rock mass is required. The model is presented concerning the geomechanical state of the massif hosting the coal seam, treatment, and preparatory workings. The model is developed based on the fundamental methods of solid mechanics and ensures a computational experiment and the reliability of the results. Stress distribution in the coal-rock mass in the vicinity of the in-seam workings was calculated in two stages. First, the stress field in the edge zones of the coal seam and in the collapsed rocks was determined by the methods of mechanics of the flowing medium. Distribution of stresses in the extremely stressed zones of the seam and the layer of collapsed rocks behind the working excavation was found by the method of characteristics by solving differential equations of the hyperbolic type. They are obtained based on the of the joint solution of the equilibrium equations, general and special Coulomb — Mohr criteria of the transition of the seam and the collapsed layer, as well as their contacts with the lateral rocks to the limiting state. Then, by replacing extremely stressed zones of the coal seam and the layer of the collapsed rocks with stresses acting at the contacts with the surrounding massif, the problem is reduced to the integral equation of the second external boundary value problem of the theory of elasticity. It is solved by the method of boundary integral equations. Insignificant influence of changes in the angle of internal friction of the collapsed rocks on the parameters of the seam bearing pressure in the vicinity of the treatment and development workings is shown. However, it significantly effects on the bearing pressure in the extremely stressed zone of the collapsed rocks layer.

scholarly journals Method for calculating the groundwater inflow into pit when mining the placer deposits by dredger

2019 ◽  
Vol 123 ◽  
pp. 01025 ◽  
Author(s):  
Borys Sobko ◽  
Anatolii Haidin ◽  
Oleksii Lozhnikov ◽  
Jacek Jarosz
Keyword(s):  
Water Supply ◽  
Water Level ◽  
External Source ◽  
Underground Water ◽  
Water Inflow ◽  
Water Level Fluctuations ◽  
Mining Operations ◽  
Research Results ◽  
Placer Deposits ◽  
Mine Workings

The research aims to increase the performance efficiency of hydromechanization equipment under the conditions of pit operation of the Motronivskyi Mining and Concentrating Plant by determining the dynamics of change in the water level in the mine workings when developing the overburden rocks and mineral. It has been generalized the world experience of determining the groundwater inflows into mine workings, which are mined by means of hydromechanization equipment. The methods have been developed for calculating the underground water inflow into the pit reservoir, when mining the placer ores by hydromechanization equipment. It has been proved that the dredger work in the conditions of the Motronivskyi MCP pit is possible without external source of water supply. The research results in determining the influence of underwater mining of overburden rocks and ore by dredger for decreasing the water level and its subsequent recovery in the reservoir of the Motronivskyi MCP pit, allow to develop a mode of mining operations without an external source of water supply. The dynamics of water level fluctuations in mine working during the working week have been established. The research results have shown that the dredger, taking into account the technical characteristics, can continuously operate for 9.5 days under the conditions of underground water inflow into the Motronivskyi MPP pit. It has also been established that after the dredging of the overburden rocks is stopped, the level of water in the pit for 2.5 days will recover.

scholarly journals Assessment of gas-dynamic danger of Krasnoslobodsky fracture zone of Starobinsky potash deposit

2019 ◽  
Vol 64 (2) ◽  
pp. 240-252
Author(s):  
P. A. Vityaz ◽  
I. I. Golovaty ◽  
V. Ya. Prushak
Keyword(s):  
Rock Mass ◽  
Fault Zone ◽  
Fracture Zone ◽  
Functional System ◽  
Geological Structure ◽  
Gas Filtration ◽  
Mining Operations ◽  
Gas Dynamic ◽  
Hydrodynamic Systems ◽  
Dynamic Phenomena

Gas-dynamic danger of Krasnoslobodsky fracture zone in Starobin Deposit of potassium salts was investigated. The study was carried out taking into account the existing ideas about the mechanism of formation of foci of gas-dynamic phenomena in the salt rock mass of the field, as well as taking into account the results of seismic and hydrogeological studies of the fault zone and the revealed patterns of distribution of gas-dynamic phenomena over the field area. The features of the geological structure of Krasnoslobodsky fracture zone in the upper salt stratum containing layers of potash ore are established. The features of the mechanism of evolution of hydrodynamic systems in fault zones are revealed. It was found that the functional system of halogen metasomatosis in these zones of the rock mass was not shielded, so that the absorption zone of the hydrodynamic system was located in the rocks of the clay-marl strata located above the upper salt strata and horizons of possible mining operations, and fractured rocks of the fault zone provided gas filtration from the system of voids formed during the evolution of hydrodynamic systems. According to the results of the study, it was concluded that in Krasnoslobodsky fracture zone within the upper salt layer there were no conditions for the formation of dangerous foci of gas-dynamic phenomena, such as sudden emissions of salt and gas and collapse of roof rocks. Accordingly, there is a possibility of safe mining operations, such as the penetration of intersecting workings through the fault zone.

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