OPTIMIZATION OF LOAD-BEARING ELEMENTS INTERACTION OF THE “MASSIF – SUPPORT” SYSTEM IN THE PREPARATORY MINE WORKINGS IN THE COAL MINING OF UKRAINE

2020 ◽  
pp. 7-18
Author(s):  
Volodymyr Bondarenko ◽  
◽  
Iryna Kovalevska ◽  
Hennadii Symanovych ◽  
Mykhailo Barabash ◽  
...  
Keyword(s):  
Coal Mining ◽  
Support System ◽  
Load Bearing ◽  
Mine Workings

scholarly journals Development and testing of an algorithm for calculating the load on support of mine workings

2021 ◽  
Vol 15 (1) ◽  
pp. 1-10
Author(s):  
Volodymyr Bondarenko ◽  
Iryna Kovalevska ◽  
Frederick Cawood ◽  
Oleksandr Husiev ◽  
Vasyl Snihur ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Support System ◽  
Mine Working ◽  
Strain State ◽  
The Finite Element Method ◽  
Load Bearing ◽  
Geological Conditions ◽  
Mine Workings ◽  
Roof Rocks

Purpose. The purpose is to develop the calculation methods for minimizing the load on the fastening system of the preparatory mine working in difficult mining and geological conditions of its maintenance. Methods. By analysing the multivariate computational experiments on the study of the stress-strain state of the load-bearing elements of the ‘massif – support’ system in the preparatory mine workings by means of the finite-element method, as well as mine observations and measurements of displacement in the coal-overlaying rock formation. Findings. An algorithm has been developed for searching the rational modes of the fastening system resistance and methods for minimizing the load on the support of the preparatory mine working, maintained in very complex mining and geological conditions. Originality.The methodical principles have been developed of minimizing the load on the fastening system of the preparatory mine working, which are based on the use of a combination of stress-strain state studies of the ‘massif – support’ system by means of the finite element method and provisions of normative documents for calculating the dimensions of the dome of natural equilibrium of the mine working roof rocks. Practical implications. The operation modes optimisation of the load-bearing elements interaction of the mine working fastening system reduces the material and labour costs during its construction and increases its stability during operation. Keywords: analysis, calculation, optimization, support, preparatory mine working, stope works, roof rocks, collapse

scholarly journals Assessment of the mutual influence of deformation-strength characteristics of the fastening system elements

2019 ◽  
Vol 123 ◽  
pp. 01006 ◽  
Author(s):  
Iryna Kovalevska ◽  
Zenon Pilecki ◽  
Oleksandr Husiev ◽  
Vasyl Snihur
Keyword(s):  
Mine Working ◽  
Strain State ◽  
Mutual Influence ◽  
Strength Characteristics ◽  
Stress Strain ◽  
Load Bearing ◽  
Stress Strain State ◽  
Operation Modes ◽  
Mine Workings ◽  
Rigid Element

The degree of influence has been determined of diversified deformation-strength characteristics of load-bearing elements in the fastening system of the preparatory mine workings, while maintaining them in a laminal massif of soft rocks. The analysis has been performed of multivariate computational experiments of the stress-strain state of the load-bearing elements of the fastening system in the preparatory mine workings from the position of the mutual influence of their deformation-strength characteristics and the support loading as a whole. An analysis is represented of the mutual influence of the operation modes of the mine working support elements between themselves and the fastening system as a whole; it has been studied the stress-strain state of the mine working fastening system with a central hydraulic prop stay, as well as a significant increase in reliability of the support performance has been analysed and determined. The tendency has been substantiated of minimizing the load on the mine working fastening system – increasing the coherence of the diversified operation modes of fastening elements by enhancing preferentially the yielding property of the rigid element. The application has been substantiated of the central yielding prop stays of the strengthening support of a frame in case of intensive rock pressure manifestation in the zone of the stope works active influence.

Fuzzy Decision Support System to Enhance Productivity in Indian Coal Mining Industry

2017 ◽  
Vol 19 (1) ◽  
pp. 50-59
Author(s):  
Gopal Singh ◽  
Kuntal Mukherjee ◽  
Alok Kumar Singh ◽  
Amar Nath Jha
Keyword(s):  
Decision Support ◽  
Decision Support System ◽  
Coal Mining ◽  
Support System ◽  
Mining Industry ◽  
Fuzzy Decision ◽  
Indian Coal ◽  
Capital Intensive ◽  
Fuzzy Decision Support System ◽  
Complete Transformation

Coal powers the Indian economy. Over 70% of the entire power generated in the country is coal based. Coal India produces over 84% of the entire country's coal. As coal mining is a capital intensive industry, it is important to maximize productivity. This paper explores how adoption of “Kayakalp” Model of e- governance in CCL, a subsidiary of Coal India, resulted in complete transformation of the company in terms of production and productivity. The fuzzy based decision support system has investigated this fact.

scholarly journals Modification of the roof bolt support technology in the conditions of increasing coal mining intensity

2019 ◽  
Vol 109 ◽  
pp. 00042 ◽  
Author(s):  
Oleksandr Krukovskyi ◽  
Yurii Bulich ◽  
Yuliia Zemlianaia
Keyword(s):  
Coal Mining ◽  
Mine Working ◽  
Stable State ◽  
Roof Bolt ◽  
Suggested Approach ◽  
Roof Bolting ◽  
Working Face ◽  
The Face ◽  
Mine Workings ◽  
Host Rocks

The modification of the technology roof bolt supporting of mine workings in the conditions of increasing the coal mining intensity has been made. The technological schemes have been developed for the phased construction of roof bolting and frame support. This schemes make it possible to temporarily postpone the setting of frames in the mine working face, reduce the time and labour intensity for covering with a grid of the mine working arch and setting the bolts, as well as to increase the safety. The analysis of changes in the stress state of the border massif during the phased construction of roof bolting and frame support has been made. It is shown that the technology of phased construction of roof bolting and frame support ensures the maintaining a stable state of host rocks. In addition, the time between the extraction of the coal-rock mass and the setting of the primary support, as well as the distance between the face and the first row of roof bolts has been reduced to a minimum. The suggested approach makes possible to ensure the rate of preparatory mine workings development that are necessary for the intensification coal mining.

scholarly journals Support System Design for Deep Coal Mining by Numerical Modeling and a Case Study

2021 ◽  
Author(s):  
Shankar Vikram ◽  
Dheeraj Kumar ◽  
Duvvuri Satya Subrahmanyam
Keyword(s):  
Numerical Modeling ◽  
Boundary Conditions ◽  
System Design ◽  
Coal Mining ◽  
Support System ◽  
Modeling Technique ◽  
Mine Design ◽  
Godavari Valley

Importance of numerical modeling in mine design gained pace after modern way of approach took birth through many variants. Methods such as Continuum and Discontinuum emerge as most effective in resolving certain issues. Cases such as heterogeneity, prevailing boundary conditions in continuum case and presence of discontinuities in other have provided solutions for many causes. A suitable support system is designed for deep virgin coal mining blocks of Godavari Valley Coalfield in India. This analysis is carried out using numerical modeling technique. The results show that the stresses at an angle to the level galleries are adverse. The level gallery/dip-raise may be oriented at 200 to 400 to reduce roof problems.

scholarly journals Designing A New Suitable Support System for Deep Virgin Coal Mining Blocks of Godavari Valley Coalfield

2021 ◽  
Author(s):  
Vikram Shankar ◽  
Dheeraj Kumar ◽  
Duvvuri Satya Subrahmanyam
Keyword(s):  
Stress State ◽  
Numerical Analysis ◽  
Coal Mining ◽  
Support System ◽  
Three Dimensional ◽  
Hazard Mapping ◽  
Mine Design ◽  
Analysis Study ◽  
Sophisticated Method ◽  
Godavari Valley

Abstract Importance of support system in mine design gained pace after modern way of approach took birth through many variants. A suitable support system is designed for deep virgin coal mining blocks of Godavari valley coalfield in India. This is achieved by measuring stress state by sophisticated method followed by geotechnical hazard mapping for identifying potential roof instability, predict hazards in advance and integrating the above parameters for analyze effects on stress due to different mining geometries by using numerical modelling technique. The three-dimensional numerical analysis study pours much light on effects causing instability than the 2D program. The results show that the stresses at an angle to the Level galleries are adverse. The level gallery/dip-raise may be oriented at 200 to 400 to reduce roof problems.

Identification of former shallow coal mining from aerial photographs: an example from West Yorkshire

1987 ◽  
Vol 4 (1) ◽  
pp. 133-136
Author(s):  
J. R. A. Giles
Keyword(s):  
Coal Mining ◽  
Aerial Photography ◽  
Large Scale ◽  
Geological Mapping ◽  
Aerial Photographs ◽  
Major Constraint ◽  
Scale Cover ◽  
Mine Workings

AbstractSystematic, large-scale, aerial photography is now available for many areas of the exposed coalfields. In West Yorkshire 1:10000 or 1:10 560 scale cover is generally available, supplemented by 1:5000 and 1:3000 cover in more limited areas. Examination of aerial photographs, in conjunction with detailed geological mapping, has identified characteristic ground patterns associated with the existence of former shallow workings. These patterns are interpreted in terms of changes of style of mining with increasing depth.The presence of shallow mine workings is a major constraint on planning in areas of exposed coalfield. The examination of large scale aerial photographs offers a rapid reconnaissance method of identifying such workings.

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