1st Edition
Combined Roof-Bolting Systems of Mine Workings
The basic principles of geomechanical processes occurring in mine workings during the extraction of minerals are discussed in this monograph. Particular attention is paid to the support system, specifically to the various roof-bolt and frame support designs, and also to the modern means providing resource-saving conditions for ensuring mine workings sustainability. The basic principles of the computing experiment performance at the modelling of geomechanical processes are also presented and the stress-strain state of "rock massif – mine working support" systems are investigated. Finally, the results of field studies are discussed and illustrated. Modern studies are presented in this work, the advanced support systems are introduced and the solution to the problem of low-cost rock pressure control in mine workings is described. Further the unique study in the thin-layer massif of weak rocks is conducted and the technical and economic aspects of mine workings maintenance during rocks heaving are described. The book will be of interest to scientists in research and design organizations in the mining sector, engineers and technological workers in mines, as well as university academics and students.
I. RESEARCH INTO STABILITY OF REUSABLE IN-SEAM WORKINGS WHEN MINING THIN COAL SEAMS
1 ANALYSIS OF ROCK PRESSURE MANIFESTATION IN THE PREPARATORY MINE WORKINGS AT THE STRUCTURAL TRANSFORMATION OF ENCLOSING ROCKS BY THE ROOF-BOLT STRENGTHENING
1.1 Experience of combined roof-bolting systems application for strengthening the roof rocks of mine workings
1.2 A mechanism for increasing the stability of mine workings by combined roof-bolting systems
1.3 The interaction of support in mine workings with border rocks under the conditions of areas formation of their limiting state
Conclusions
2 RESEARCH AND ANALYSIS OF THE EXPERIENCE OF THE PREPARATORY MINE WORKINGS REUSE AT YUBILEINA MINE
2.1 Mining research methodology
2.2 Analysis of mining research results
Conclusions
3 THE COMPUTATIONAL EXPERIMENT SUBSTANTIATION AND STRESS-STRAIN STATE ANALYSIS OF BORDER ROCKS, AS WELL AS OF THE BASIC FASTENING SYSTEM OF PREPARATORY MINE WORKINGS IN THE ZONE OF STOPE WORKS INFLUENCE
3.1 Construction of geomechanical models in conducting the computational experiments
3.2 Analysis of stresses intensity in the border rocks of the preparatory mine working in the bearing pressure zone ahead of the longwall face
3.3 Research and analysis of the stresses intensity of the basic fastening system in the bearing pressure zone ahead of the longwall face
3.4 The stress intensity of border rocks in the zones of beginning of protective strip resistance and stabilization of the rock pressure manifestation
3.5 The stress intensity analysis in basic fastening and protection systems behind the longwall face
Conclusions
4 RESEARCH AND ANALYSIS OF THE STRESS STATE OF THE LOAD-BEARING ELEMENTS IN THE PREPARATORY MINE WORKING “MASSIVE – FRAME – COMBINED ROOF-BOLTING SYSTEM”
4.1 Stress state of rocks enclosing mine working in the area of stabilization of rock pressure manifestations
4.2 The stress state of fastening system elements in the preparatory mine working and comparison with the basic variant of its fastening
Conclusions
5 ESTABLISHING AND ANALYZING THE PATTERNS OF GEOMECHANICAL FACTORS INFLUENCE ON THE RESISTANCE OF THE COMBINED ROOF-BOLTING SYSTEM TO ROCK PRESSURE
5.1 Substantiation of the criterion for assessing the level of the roof-bolts resistance to the rock pressure manifestations
5.2 The influence of the depth of mine working location
5.3 Influence of the average calculated rocks resistance to compression of the adjacent massif
5.4 Influence of the ratio of the average calculated resistance to compression of the immediate roof rocks to its thickness
Conclusion
6 DEVELOPMENT AND SUBSTANTIATION OF THE PARAMETERS CALCULATION OF THE ROOF ROCKS STRENGTHENING BY A COMBINED ROOF-BOLTING SYSTEM IN THE PREPARATORY MINE WORKINGS
6.1 Substantiation and calculation of the parameters of the resin-grouted roof bolts location in the rocks of mine working arch
6.2 Substantiation and calculation of strengthening the rocks in the arch of mine working with rope bolts
6.3 Algorithm for calculating the parameters of the combined roof-bolting system for strengthening the rocks of the arch in the preparatory mine workings
Conclusions
7 THE INFLUENCE OF THE CENTRAL PROP STAYS OF THE STRENGTHENING SUPPORT ON THE FASTENING SYSTEM STRESS-STRAIN STATE OF MINE WORKING
7.1 Analysis of the operation modes of the central prop stays of the strengthening support in the preparatory mine workings
7.2 The research of the fastening system stress-strain state of mine working with the yielding prop stay in the strengthening support
Conclusions
Synthesis of the research results to Chapter I
Chapter II. STRUCTURAL TRANSFORMATIONS OF THE ROCK MASSIF AND STABILITY OF MINE WORKINGS UNDER THE DOWNWARD AND JOINT MINING OF С8l AND С9 COAL SEAMS 106
8 GEOMECHANICAL AND METHODICAL ASPECTS OF RESEARCH INTO STABILITY OF THE REUSABLE MINE WORKINGS WHEN OVERWORKING AND UNDERWORKING A PARTING IN SEAMS С8 l AND С9
8.1 Geomechanical peculiarities of C8l seam mining
8.2 Development and substantiation of the geomechanical model of the 861 belt entry
9 RESEARCH AND STRESS-STRAIN STATE ANALYSIS OF THE ROCK MASSIF ENCLOSING THE 861 BELT ENTRY AT THE BASIC AND RECOMMENDED SCHEMES OF MAINTAINING
9.1 Anomalies of the rock pressure manifestations in the rock massif in the vicinity of the 861 belt entry at the basic scheme of maintaining
9.2 Research and stress-strain state analysis of coal-bearing massif around the 861 belt entry at the recommended scheme of its maintenance
10 RESEARCH AND ANALYSIS OF THE STRESS-STRAIN STATE OF FASTENING AND PROTECTION BASIC SYSTEMS ELEMENTS OF THE 861 BELT ENTRY OF THE SEAM С8l
10.1 Analysis of vertical stresses components
10.2 Determination of horizontal stresses components
11 RESEARCH AND ANALYSIS OF THE STRESS-STRAIN STATE OF FASTENING AND PROTECTION RECOMMENDED SYSTEMS ELEMENTS FOT MAINTAINING THE 861 BELT ENTRY OF THE SEAM С8l
11.1 Analysis of vertical stresses component
11.2 Horizontal stresses components distribution
11.3 Stresses intensity research
11.4 Recommendations for selecting the parameters of the fastening and protection systems of reused mine workings through the example of mining the 861 longwall face
Summarizing the research results to Chapter II
Chapter III. RESEARCH INTO HEAVING OF MINE WORKINGS BOTTOM WHEN MINING THE FLAT-LYING SEAMS OF THE WESTERN DONBAS
12 ANALYSIS OF THE PROBLEM OF PREDICTING THE BOTTOM ROCKS HEAVING OF MINE WORKINGS
12.1 Technical and economical aspects of mine workings maintenance during rocks heaving
12.2 Analysis of concepts of the mechanism of occurring the bottom rocks heaving and factors affecting its development
12.3 Analysis of prediction techniques of the bottom rocks heaving in mine workings
12.4 Structure, purpose and objectives of research in the geological and industrial Western Donbas region
13 CONSTRUCTION OF GEOMECHANICAL MODEL OF THE “MASSIF – IN-SEAM WORKING” SYSTEM
13.1 Structure of adjacent coal-bearing rock stratum of the mined-out coal seams of the Western Donbas
13.2 Modeling the soft mine rocks deformation in the vicinity of in-seam working
13.3 Substantiating parameters of in-seam workings and their support
Conclusions
14 TESTING THE MODEL OF THE GEOMECHANICAL SYSTEM “MASSIVE – IN-SEAM WORKING”
14.1 The substantiation of parameters of the coal-bearing rock massif
14.2 Parameters substantiation of the in-seam working and support
Conclusions 195
15 RESEARCH AND ANALYSIS OF INFLUENCE OF STRUCTURE AND PROPERTIES OF THE COAL-BEARING ROCK STRATUM ON THE STRESSSTRAIN STATE OF THE “MASSIF – IN-SEAM WORKING” SYSTEM
15.1 Substantiation of variants of stress-strain state calculation of “massif – in-seam working” systems and the methodology of conducting the computational experiment
15.2 Stress-strain state analysis of the bottom rocks in in-seam working
Conclusions 221
16 PECULIARITIES OF THE HEAVING DEVELOPMENT MECHANISM OF THE BOTTOM ROCKS OF IN-SEAM WORKING
Conclusions
17 STUDY OF PATTERNS RELIABILITY OF RELATION OF THE BOTTOM ROCKS STRUCTURE AND PROPERTIES WITH ITS HEAVING
17.1 Development of a computational experiment technique
17.2 Establishing the patterns of structure and properties influence of bottom rocks of the coal seam on heaving manifestations in in-seam workings
18 ASSESSING THE STATE OF BOTTOM IN IN-SEAM WORKINGS
18.1 Construction of regression equations for calculating the value of heaving in the bottom rocks
18.2 The link of value of the bottom rocks heaving with the depth of mine working location
18.3 Separation of mining-and-geological conditions according to the nature of heaving development and degree of the bottom rocks stability
19 TECHNIQUE FOR PREDICTING AND MONITORING OF BOTTOM IN IN-SEAM WORKINGS OF THE WESTERN DONBAS MINES
19.1 General information and calculations algorithm
19.2 Formation of the initial data base for performing calculations
19.3 Assessment of the state of bottom rocks and prediction of the value of its heaving
19.4 An example of a predictive calculating the bottom rocks heaving of in-seam working
Conclusions
Biography
Volodymyr Bondarenko is the Head of the Department of Mining Engineering and Education at the Dnipro University of Technology, Professor, Doctor of Technical Sciences, Honored Scientist, Laureate of the state prize of Ukraine in science and technology, author of the scientific discovery in mining, and member of Society of Mining Professors. The field of scientific activity is the solution of educational, scientific and technical problems related to coal and iron ore extraction.
Iryna Kovalevska is Professor of the Department of Mining Engineering and Education at the Dnipro University of Technology, Doctor of Technical Sciences, Laureate of the state prize of Ukraine in science and technology, and author of the scientific discovery in mining. The field of activity is the mechanics of surrounding rocks strengthening by means of resource-saving technologies.
Hennadiy Symanovych is Professor of the Department of Labor Protection and Civil Security at the Dnipro University of Technology, Doctor of Technical Sciences. The basic scientific activity is aimed at the substantiating methods for mining operation intensification at coal enterprises.
Mykhaylo Barabash is Director of the Directorate of Coal Mining at LLC "DTEK Energy", Candidate of Technical Sciences (Ph.D). The main activity is aimed at the selection of optimal support systems advancing operational characteristics as an essential part of rock massif stability improvement.
Viktor Chervatiuk is Deputy Director of the Directorate of Coal Mining at LLC "DTEK Energy", Candidate of Technical Sciences (Ph.D). Specialist in the field of calculating stress-strain state of multi-parameter geomechanical systems elements during the stoping and preparation works in the rock massif.
Oleksandr Husiev is Director of the Colliery Group "Dniprovske" at PJSC "DTEK Pavlohradvuhillia", Candidate of Technical Sciences (Ph.D). The activity fields are substantiation of mine workings stability parameters, the improvement of low-cost technologies for the development of mine workings support and the selection of the frame supports and rock bolts rational parameters.
Vasyl Snihur is Director of the Colliery Group "Heroiv Kosmosu" at PJSC "DTEK Pavlohradvuhillia", Candidate of Technical Sciences (Ph.D). Specialist in the study of the stress-strain state of mine workings in the soft rocks thin-bedded massif.
