scholarly journals Occurrence of Linear Discontinuous Deformations in Upper Silesia (Poland) in Conditions of Intensive Mining Extraction—Case Study

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1897
Author(s):  
Piotr Strzałkowski ◽  
Katarzyna Szafulera
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Building Structures ◽  
Tectonic Structure ◽  
Mining Operations ◽  
Mining Areas ◽  
Tectonic Faults ◽  
Mining Conditions ◽  
The Subject

Currently, linear discontinuous deformations in mining areas are an important issue, both due to the frequency of their occurrence and the threat they pose to general safety. This paper presents a case study of an occurrence of such a deformation. The analyses of the geological and mining conditions, as well as the conducted calculations presented herein, indicate that the cause of the deformation was the occurrence of high-value horizontal tensile strains. It was triggered by mining exploitation carried out with caving in three seams at depths between 200 and 545 m. An additional factor conductive to the creation of the deformation was the tectonic structure of the rock mass. The subject matter of the paper is significant given the growing number of discontinuous linear deformations occurring on the surface due to underground mining—even if the mining was conducted at great depths. They were formed as a result of intensive underground mining operations and the occurrence of high-value deformations. These deformations were particularly dangerous to building structures on the surface, which were often damaged. For this reason, it was worthwhile to make arrangements regarding the correlation between the occurrence of the deformations and the values and the distribution of continuous deformations caused by underground extraction, as well as the existence of tectonic faults.

scholarly journals MONITORING OF THE UNDERMINED TERRITORIES OF KARAGANDA COAL BASIN ON THE BASIS OF SATELLITE RADAR INTERFEROMETRY

2016 ◽  
Vol III-6 ◽  
pp. 37-40
Author(s):  
S. B. Ozhigina ◽  
D. V. Mozer ◽  
D. S Ozhigin ◽  
S. G. Ozhigin ◽  
O. G. Bessimbayeva ◽  
...  
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Integrated Approach ◽  
Radar Interferometry ◽  
Coal Basin ◽  
Mining Operations ◽  
Mining Areas ◽  
Close Proximity ◽  
Satellite Radar ◽  
Karaganda Coal

In the Karaganda coal basin, mines are located in close proximity to each other and to the city of Karaganda and ongoing mining operations are accompanied by a dangerous process of settling the earth's surface and monitoring are essential for the region's econ-omy. Underground mining leads to the formation of voids in the rock mass, which cause displacement of the earth surface. This paper demonstrates an innovative use of the integrated approach for monitoring on the example of Karaganda coal basin, which includes estimation of the rock mass displacement using leveling profile lines and satellite radar interferometry. It is proved that satellite radar interferometry provides reliable results of surface subsidence measurements in mining areas and can be used for con-sidered sort of monitoring.

scholarly journals The influence of selected mining and natural factors on the sinkhole creation hazard based on the case study

2021 ◽  
Vol 80 (3) ◽  
Author(s):  
Piotr Strzałkowski
Keyword(s):  
Rock Mass ◽  
Public Safety ◽  
Current Issue ◽  
Underground Mining ◽  
The Public ◽  
Natural Factors ◽  
The Subject ◽  
The Moment ◽  
The Impact

AbstractThe formation of sinkholes, especially in developed areas, constitutes a considerable hazard to the public safety. Due to the above, the subject of the paper is a significant and current issue. The paper includes a case study of sinkholes forming over shallow mine galleries. Calculations of the workings’ stability and the impact of the underground mining exploitation have been conducted. The probability of sinkhole formation has been determined as well. The time of sinkholes formation did not correspond with the time in which the mining exploitation affected the gallery workings and the moment in time for which the rock mass deformations caused by the exploitation were at the highest level. The performed exploitation caused occurrence of cracks in the rock mass over the working. This allowed the transportation of the loose overburden by rainwater to workings and as a result sinkholes were created—suffosion occurred. The Quaternary overburden built of sands and sandy loams was probably washed out by rainwater, which led to the formation of sinkholes. In all locations, where shallow voids exist at a depth up to 100 m and the overburden consists of loose rocks, one should consider the probability of sinkholes formation.

scholarly journals MONITORING OF THE UNDERMINED TERRITORIES OF KARAGANDA COAL BASIN ON THE BASIS OF SATELLITE RADAR INTERFEROMETRY

2016 ◽  
Vol III-6 ◽  
pp. 37-40
Author(s):  
S. B. Ozhigina ◽  
D. V. Mozer ◽  
D. S Ozhigin ◽  
S. G. Ozhigin ◽  
O. G. Bessimbayeva ◽  
...  
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Integrated Approach ◽  
Radar Interferometry ◽  
Coal Basin ◽  
Mining Operations ◽  
Mining Areas ◽  
Close Proximity ◽  
Satellite Radar ◽  
Karaganda Coal

In the Karaganda coal basin, mines are located in close proximity to each other and to the city of Karaganda and ongoing mining operations are accompanied by a dangerous process of settling the earth's surface and monitoring are essential for the region's econ-omy. Underground mining leads to the formation of voids in the rock mass, which cause displacement of the earth surface. This paper demonstrates an innovative use of the integrated approach for monitoring on the example of Karaganda coal basin, which includes estimation of the rock mass displacement using leveling profile lines and satellite radar interferometry. It is proved that satellite radar interferometry provides reliable results of surface subsidence measurements in mining areas and can be used for con-sidered sort of monitoring.

scholarly journals The influence of para-seismic vibrations, induced by blasting works, on structures: a Case Study

2018 ◽  
Vol 36 ◽  
pp. 02001 ◽  
Author(s):  
Wacław Andrusikiewicz
Keyword(s):  
Land Surface ◽  
Underground Mining ◽  
Control Point ◽  
Control Room ◽  
Mining Operations ◽  
Blasting Operation ◽  
Seismic Vibrations ◽  
Harmful Effects ◽  
Seismic Impacts

Underground mining operations are often associated with the necessity to use explosives. Several hundreds of kilograms of explosives, subdivided into small charges suitable for a specific mining job, are used each time in a blasting operation. In many cases, mining engineers carry out remote central blasting works, which means that all the charges placed at faces are initiated from one control point (usually, a control room in the mine) at the same time. Such coordinated explosions generate para-seismic movements whose consequences can be felt on land surface, with subsequent effects identified in buildings and structures. This paper discusses briefly selected standards applicable to the harmful para-seismic impacts. The author presents the results of the research conducted with the intention to identify harmful effects of the basting works carried out in the “Kłodawa” Salt Mine.

scholarly journals Stability of a rock mass using the key block theory: a case study

2020 ◽  
Vol 150 ◽  
pp. 03024
Author(s):  
Y. Zerradi ◽  
A. Lahmili ◽  
M. Souissi
Keyword(s):  
Rock Mass ◽  
Underground Mines ◽  
The Finite Element Method ◽  
Empirical Methods ◽  
Mining Operations ◽  
Initial Equilibrium State ◽  
Eastern Zone ◽  
Geometrical Data ◽  
Key Block

In underground mines, excavating disturb the initial equilibrium state of the rock mass, and therefore require selection of a support in order to control the movement of rocks, avoid landslide and work safely. Thus, the progress of mining operations in the ST2 mineralization, in the eastern zone of the Bouazzer mine, is disrupted because of stability problems. On the basis of field observations and analyzes of core drill, the geological and structural study, carried out in this area, has shown the existence of three types of facies: altered and cracked diorite, cobaltiferous mineralization which is in contact with serpentinites. In fact, the empirical methods such as Barton, Bieniawski and the recommendations of the AFTES have qualified the rock mass as poor, furthermore they proposed as kind of supports: steel arches, shotcrete and rock-bolts. Numerical simulation by the finite element method proved to be very complex due to existence of several types of discontinuities (faults, shistosities and joints).These discontinuities are natural fractures that delimit various shapes and sizes of wedges, which can become detached from the roof or siding of the excavation and collapse under their own weight. Although the empirical methods cited above provide supports for each facies, however, this support is expensive and difficult to implement in practice because it must cover the entire surface of the excavation and thus not allowing to detect stable blocks that do not require a support. For this it was essential to carry out an analysis of wedges to better locate unstable blocks. The treatment of fracturing data has highlighted the presence of five sets of discontinuities of which three sets are principals and the other two are minor joints. Then, while taking into account the geometrical, mechanical data of the discontinuities as well as the geometrical data of the excavation, we were able to detect the shape and the size of the unstable blocks and the sets of discontinuities delimiting them and which favor their sliding and tilting. Thus, we calculated the number of anchor bolts needed to stabilize these blocks in order to ensure an acceptable safety factor. This study shows clearly how a wedge analysis of the rock mass can guide and optimize the support work.

scholarly journals Techno-Economic Feasibility of the Longwall Top Coal Caving Method Based on the FTCD Index: A Parametric Case Study in India

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6115
Author(s):  
Nasina Balasubrahmanyam ◽  
Gnananandh Budi
Keyword(s):  
Underground Mining ◽  
Economic Feasibility ◽  
Geotechnical Parameters ◽  
Financial Assessment ◽  
High Resource ◽  
Coal Recovery ◽  
Mining Conditions ◽  
Coal Grade ◽  
Longwall Top Coal Caving

An extraction method for deep-seated thick seam deposits by underground mining with high resource recovery has remained a great challenge for Indian mining engineers, whereas the longwall top coal caving (LTCC) method has evolved as an effective method for various geo mining conditions in China and other counties. The percentage of top coal recovery (TCR) plays a predominant role in determining the feasibility of LTCC, which relies on the First Top Coal Caving Distance (FTCD). In this paper, the critical geotechnical parameters are identified, numerically simulated, and statistically analyzed, and the FTCD for Indian geo-mining conditions is developed and validated. A financial assessment is conducted, considering 70% top coal recovery at 85% performance level, cost of production escalated by 20% and fall in coal grade by two grades. The internal rate of return (IRR) for LTCC is 30.24% as per the sensitivity analysis where it is only 18% in single pass longwall method. This study contributes to evaluating both the technical and economic feasibility of introducing LTCC in Indian geo-mining conditions.

scholarly journals Methodology of modeling nonlinear geomechanical processes in blocky and layered rock masses on models made of equivalent materials

2021 ◽  
Vol 250 ◽  
pp. 542-552
Author(s):  
Boris Zuev
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Similarity Criterion ◽  
Nonlinear Problems ◽  
Rock Masses ◽  
Mining Operations ◽  
Initial Field ◽  
Reliable Determination ◽  
Nonlinear Geomechanical Processes

The research purpose is to develop a methodology that increases the reliability of reproduction and research on models made of equivalent materials of complex nonlinear processes of deformation and destruction of structured rock masses under the influence of underground mining operations to provide a more accurate prediction of the occurrence of dangerous phenomena and assessment of their consequences. New approaches to similarity criterion based on the fundamental laws of thermodynamics; new types of equivalent materials that meet these criteria; systems for the formation of various initial and boundary conditions regulated by specially developed computer programs; new technical means for more reliable determination of stresses in models; new methods for solving inverse geomechanical problems in the absence of the necessary initial field data have been developed. Using the developed methodology, a number of complex nonlinear problems have been solved related to estimates of the oscillatory nature of changes in the bearing pressure during dynamic roof collapse processes; ranges of changes in the frequency of processes during deformation and destruction of rock mass elements, ranges of changes in their accelerations; parameters of shifts with a violation of the continuity of the rock mass under the influence of mining: secant cracks, delaminations, gaping voids, accounting for which is necessary to assess the danger of the formation of continuous water supply canals in the water-protection layer.

scholarly journals Simulation Possibilites of the Post-Mining Goafs Impact on the Deformations Induced by Next Underground Mining Operations with Use of the Cellular Automata Method

2020 ◽  
Author(s):  
Sikora Paweł
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Mining Area ◽  
Mining Operations ◽  
New Approach ◽  
Upper Silesian Coal Basin ◽  
Under Construction ◽  
The Impact ◽  
Further Development

Abstract Underground mining operations in the area of a rock mass affected by previous exploitation may cause additional deformations to appear on the surface. The size of these deformations can be significant, and their character is often non-linear. The nature of these deformations cannot be justified solely by the impact of current mining operations. At the same time, the predictive method of S. Knothe, widely used in Poland, does not explicitly include these types of phenomena. In the area of intensive and long-term mining exploitation, such as the Upper Silesian Coal Basin, the practical possibility of simulating this occurrence may be helpful in the planning of new mining exploitation under construction objects. Today we are usually limited to numerical modelling methods like finite difference method (FDM). This one base on the principle of mechanical similarity. The theoretical usefulness of method (and its similar) has already been proven many times. The main impediment to its practical application is the lack of recognition of the rock mass in terms of its mechanical properties. The presented method is a new approach to the possibility of modelling the subject phenomenon. The method has not been used in practical forecasting mining area deformation caused by underground deposits mining. It’s characterized by a huge potential for further development.

scholarly journals DESIGN OF DRILLING AND EXPLOSION WORKS IN UNDERGROUND MINING USING IN MICROMINE GGIS

2020 ◽  
Vol 1 (1) ◽  
pp. 3-14
Author(s):  
Andrei A. Basargin ◽  
Viktor S. Pisarev
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Rock Properties ◽  
Modern World ◽  
Geological Exploration ◽  
Mining Operations ◽  
Design Decisions ◽  
Well Placement ◽  
Rational Distribution ◽  
Special Software

In the modern world, an increasing number of enterprises involved in geological exploration and exploration use special software and information systems in their work. The use of such systems can significantly accelerate the processing and analysis of information. They make it possible to automate the processing and interpretation of geological exploration data, as well as use them to model deposits and design underground drilling and blasting operations. GGIS Micromine will automate the design of drilling and blasting operations while ensuring well placement taking into account the block geometry and rock properties, and a rational distribution of borehole charges for the most efficient crushing of rock mass. In conditions of high intensity of mining operations at the MGIS quarries, Micromine ensures the efficiency and multivariance of design decisions when performing blasting.

scholarly journals LEXICAL AND SEMANTIC GROUPS OF MINING TECHNICAL ARTEFACTS NAMES (case study of terms from the conceptual subcategory “Machines”)

2019 ◽  
pp. 3-9
Author(s):  
Tetiana Vysotska
Keyword(s):  
Open Systems ◽  
Underground Mining ◽  
Russian Language ◽  
Lexical Semantic ◽  
Quantitative Calculation ◽  
The Subject ◽  
Technical Artifacts ◽  
Object Of Study ◽  
The Russian Language

The purpose of the study is to identify and to describe the lexical-semantic groups of the names of mining artefacts that are included in the conceptual subcategory of “Machines”. The object of study is Russian terms-names of mining technical artifacts, the subject is their lexical and semantic groups. The purpose of the study determined the range of tasks: 1) to characterize the method of “Machines” subcategory formation; 2) to identify lexical-semantic groups of machine names; 3) to define the reference terms within the selected lexical-semantic groups. The research material is a corpus of mining technical artifacts with a total volume of more than 3,600 units, formed on the basis of a continuous review of encyclopedic reference books on mining, mining encyclopedia, polytechnical dictionaries of the Russian language, textbooks, manuals and reference books on mining, mining machines, mining complexes for open and underground mining, etc. The following methods have been used: analytical method, quantitative calculation method, component analysis method. As a result of the study, lexical-semantic groups of mining technical artifacts related to the conceptual subcategory “Machines” are identified and described. Practical application of the results is possible in further studies of the category of nomination in the Russian language. Conclusions: 1) the subcategory of “Machines”, represented in our sampling by 1330 lexical units, contains 17 lexical-semantic groups; 2) the basic components of the general technical nature, such as machine, machine-tool, conveyor, combine, and more specialized ones, such as excavator and dredge, possess the greatest nominative potential in various LSG of the subcategory under investigation; 3) in general, each of the LSG and nominative paradigms are open systems, headed by the subcategory name and completed by numerous nomenclature classes.

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