Energy Efficient Technologies to Support Mine Workings under Complicated Geomechanical Conditions

2017 ◽  
Vol 25 ◽  
pp. 35-42
Author(s):  
Olexandr Solodyankin ◽  
Sergey Hapieiev ◽  
Mikhail Vygodin ◽  
Valentin Yanko
Keyword(s):  
Rock Mass ◽  
Mine Working ◽  
Energy Efficient ◽  
New Technology ◽  
Efficient Technology ◽  
Mine Workings ◽  
The Stability ◽  
Complicated Conditions ◽  
Area Filling

Objective of the studies is the substantiation of energy efficient technologies to support permanent mine workings under complicated conditions of mines in Western Donbass. The results of analysis of geomechanical processes within rock mass neighbouring extended mine working have been demonstrated. The possibility to fill up underpropped area at different stages of a mine working construction has been shown. Efficient technology to improve the stability of mine workings by means of underpropped area filling up with hardening mixtures pneumatically has been considered. The results of the new technology to fill up underpropped area while constructing the main crosscut in Samarskaia mine (“DTEK Pavlogradugol” Company) have been demonstrated.

Rational Methods of Concentration of Small, Thin, Finely Dispersed and Colloidal Gold of Technogenic Waste Deposits Will Ryveem

2018 ◽  
Vol 22 (10) ◽  
pp. 11-17 ◽  
Author(s):  
V.V. Karmazin ◽  
I.O. Krylov ◽  
P.A. Sysa ◽  
M.A. Frolov
Keyword(s):  
Rock Mass ◽  
Colloidal Gold ◽  
Energy Efficient ◽  
Low Frequency ◽  
Gold Deposits ◽  
Point Of View ◽  
Efficient Technology ◽  
Theoretical Substantiation ◽  
Technogenic Waste ◽  
Energy Efficient Technology

The potential of the ore-bearing territory and the dumps of the former mine placed on it are estimated from the point of view of application of new technological solutions that will allow to process the man-made rock mass profitably. The nature of the distribution of gold by size classes is established, which can significantly reduce the volume of processed rock mass. Theoretical substantiation of acceleration of natural segregation with application of low-frequency sound influence is given. The segregation-diffusion concentration of gold is proposed, which allows in the future to create an energy-efficient technology of recovery from man-made waste and apply it to the processing of gold deposits still in the depths.

scholarly journals Interpretive structural modeling for technology-related barriers to energy efficiency improvement in Indonesia steel industry

2018 ◽  
Vol 154 ◽  
pp. 01057
Author(s):  
Apriani Soepardi ◽  
Pratikto ◽  
Purnomo Budi Santoso ◽  
Ishardita Pambudi Tama
Keyword(s):  
Steel Industry ◽  
Energy Efficient ◽  
Information Quality ◽  
New Technologies ◽  
New Technology ◽  
Information Access ◽  
Efficient Technology ◽  
Interpretive Structural Modeling ◽  
Future Technology ◽  
Energy Efficient Technology

This paper investigates the existence of the barriers in Indonesia steel industry, namely: existing technologies were still considered efficient, new technologies not available, new technology not adequate or inappropriate at the site, the energy efficient technology not compatible with other elements of the plant, the uncertainty about future technology standards, lack of technical skills, technology installation period was too long, and poor information quality regarding access to new energy efficient technology. Five practitioners from the national steel industry were retrieved to identify and analyze critical elements and the causal interrelationships among the technology-related barriers. Finally, using the approach of interpretive structural modelling, the barriers were clustered in accordance with their driving power and dependence power. Lack of reliable information access about new technologies is the only barriers at the bottom level of the hierarchy, implying higher driving power. It is also observed that the availability of new technologies, existing technology still efficient, and the uncertainty about future technology standardization have a weak dependent on the other constructs but strongly driver. The four remaining constructs are identified as dependent obstacles. It means that these barriers are the automatic followers of other impediments. The result of this model will assist managers to understand the relative importance and the interdependencies among the barriers. It can guide them to resolve these barriers.

INFLUENCE OF UNDERMINING ROCK MASS ON THE STATE OF MINE WORKINGS

2021 ◽  
pp. 64-72
Author(s):  
Boris Kodunov ◽  
◽  
Alexander Nosach ◽  
Keyword(s):  
Computer Simulation ◽  
Rock Mass ◽  
Mine Working ◽  
Simulation Method ◽  
The State ◽  
Practical Significance ◽  
Electric Locomotive ◽  
Subsidence Trough ◽  
Significant Deterioration ◽  
Mine Workings

Purpose. Research of influence of shifts of rocks on a condition of mine workings at their undermining by longwalls. Methods. The study used a computer simulation method. The simulation was performed by simulating the process of rock shift. The initial coordinates of the points of the rock mass turned into the final ones. This allowed to build sections of the rock mass after undermining, which characterized its deformed state, as well as graphs of displacements and deformations in the mine workings. Results. The performed simulation showed that during the movement of the longwall, the mine working (drift), which is undermined, consistently falls into the zone of horizontal deformations of tension, compression and complete displacements. After stopping the longwall, part of the mine working near the boundaries of the displacement area will be constantly in the zones of stretching and compression. It is established that at a distance of 40 m in front of the moving face, the mine working is in the least favorable conditions with maximum vertical compression deformations. Under the given conditions the drift for the most part after completion of clearing works is in a zone of full subsidence. This zone is characterized by the maximum possible subsidence and the absence of deformations. The performed researchers showed that the conditions of undermining of the southern field haulage drift of seam l7 proved to be quite favorable. Shifts and deformations did not cause a significant deterioration in the state of mine working, except for the increase of slopes on the edge sections of the subsidence trough, which makes it difficult to carry out electric locomotive rolling. For any other purpose, after minor repairs, the mine working may continue to operate. Scientific novelty. The study of the process of shear by computer simulation allowed to establish the patterns of shear and deformation during undermining of the mine working. This is the first time for the conditions of the Ukrainian Donbass. Practical significance. The obtained results can be used to predict the condition of mine workings that are undermined during the cleaning works in similar conditions. Key words: undermining overlying mine workings, shifts, deformations, zone of full subsidence, subsidence trough.

scholarly journals Hydrogeologic and Hydraulic Conditions of Old Mine Workings of the Former Jeroným Mine / Hydrogeologické A Hydraulické Poměry Starých Důlních Děl Bývalého Dolu Jeroným

2011 ◽  
Vol 57 (2) ◽  
pp. 57-65
Author(s):  
Arnošt Grmela ◽  
Petr Žůrek ◽  
Radovan Kukutsch ◽  
Robert Kořínek
Keyword(s):  
Mine Working ◽  
The Public ◽  
Heritage Site ◽  
Hydraulic Conditions ◽  
Microclimatic Conditions ◽  
Mine Workings ◽  
The Stability

Abstract The Jeroným Mine, situated in the locality of the Slavkovský les Protected Landscape Area, is a unique heritage site associated with mining in the 15th and 16th centuries. To make this mine working accessible to the public, it is necessary in the first place to stabilize underground voids and to ensure such internal microclimatic conditions so that any degradation of the mine working and any hazard to workers performing restoration operations and later to visitors will not occur. The contribution deals with the factors conditioning and affecting the stability of this system of mine workings.

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.

New Technology of Efficient Blasting Rock for Large Section Rock Roadway Drivage in Deep Shaft with Complicated Conditions

2011 ◽  
Vol 94-96 ◽  
pp. 1766-1770 ◽  
Author(s):  
Wei Zhang ◽  
Dong Sheng Zhang ◽  
Peng Shao
Keyword(s):  
Rock Mass ◽  
New Technology ◽  
Mining Area ◽  
Engineering Practice ◽  
Control Technology ◽  
Large Section ◽  
Mining Areas ◽  
Deep Rock ◽  
Complicated Conditions ◽  
Rock Roadway

Based on the different failure mechanism for shallow and deep rock mass, combined with the test result of ground stress and difficulties of blasting rock in Xinwen mining area, used mines rock mass mechanics and modern blasting theory and actively carried out technical reform, the new forming control technology of directional fracture blasting and control technology of multi-directional fusion blasting and efficient blasting technology of compound cut had been adopted, which produced a set of new efficient blasting rock technology for large section rock roadway drivage in deep shaft with complicated conditions. The engineering practice application results showed that the new efficient blasting rock technology could decrease the numbers of shot holes and explosive material consumption, enhance drivage efficiency and circulation footage, ameliorate integral forming quality of roadway and realize maximum month drilling footage at 146 m, the research achievements can provide reference for deep roadway drivage construction in other mining areas with similar conditions.

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.

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