scholarly journals Principles for certain geomechanics problems solution during overworking of mine workings

2021 ◽  
Vol 280 ◽  
pp. 01007
Author(s):  
Volodymyr Bondarenko ◽  
Iryna Kovalevska ◽  
Hennadii Symanovych ◽  
Mykhailo Barabash ◽  
Ildar Salieiev
Keyword(s):  
Coal Seam ◽  
Coal Mining ◽  
Mine Working ◽  
Mining Activity ◽  
Mining Engineering ◽  
Real Representation ◽  
Resource Saving ◽  
Mining Operations ◽  
Complete Extraction ◽  
Mine Workings

This paper deals with two relevant and interrelated directions of coal mining development. Firstly, the resource-saving complete extraction of reserves, and secondly, the intensification of mining activity through mining operations conducted on several seams. The objective of overworking of mine workings with a real representation of mining-and-geological and mining-engineering conditions has been formulated. Five peculiarities of the geomechanical models construction for overworking of mine works have been revealed and substantiated. The technology for performing a series of computational experiments is proposed. The task of the protecting pillar influence, which is located in overlying coal seam, on the state of mine working placed in the underlying coal seam has been solved. An optimal scheme for its maintenance is proposed.

Evolution of Microclimatic Conditions in Paskov Mine / Ewolucja Warunków Mikroklimatycznych W Kopalni Paskov

2012 ◽  
Vol 57 (4) ◽  
pp. 1045-1055
Author(s):  
Pavel Zapletal ◽  
Pavel Prokop ◽  
Vítězslav Košňovský
Keyword(s):  
Coal Mining ◽  
Mining Activity ◽  
Mining Engineering ◽  
Special Program ◽  
Main Subject ◽  
Coal Basin ◽  
Research Activities ◽  
Microclimatic Conditions ◽  
Technical University

Abstract The main subject of this paper focuses on scientific and research activities conducted in the Institute of Mining Engineering and Safety of the VŠB-Technical University of Ostrava. Cooperation between the VŠB-Technical University of Ostrava and OKD A.S., the only representative of coal mining in the Ostrava-Karviná coal basin, has recently begun to develop again. This paper describes an example discussed in a certain study, which has been undertaken for the Paskov mine, OKD a.s., dealing specifically with the evolution of microclimate parameters in mines that depend on the progress of mining activity at deeper levels over a period of several years. To this end, a special program, aimed at determination of the necessary refrigerating capacity, was established at the VŠB-Technical University of Ostrava.

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 OPTIMASI PENAMBANGAN BATUBARA MENGGUNAKAN KONTROL SLOPE STABILITY RADAR DI PIT C1 BLOK 8 BINUNGAN MINE OPERATION AREA 2 PT BERAU COAL

2020 ◽  
Vol 1 (1) ◽  
pp. 533-554
Author(s):  
Saeful Aziz ◽  
Christian Natanael Simamora ◽  
Ida Wayan Supriharta ◽  
Rahmantha Purba Anggana
Keyword(s):  
Slope Stability ◽  
Coal Seam ◽  
Coal Mining ◽  
Continuous Improvement ◽  
Emergency Response ◽  
Mine Planning ◽  
Mining Operations ◽  
Stability Of Slopes ◽  
Final Design ◽  
Safety And Environment

ABSTRAK Pit C1 Blok 8 Site Binungan Mine Operation Area 2 PT Berau Coal merupakan salah satu area operasional penambangan batubara dengan karakteristik multi-seam, kemiringan lapisan batubara pada interval 12 – 20 derajat, ketebalan lapisan batubara pada interval 0.5 – 7.5 meter, dan variasi ketebalan interburden pada interval 3 – 300 meter. Karakteristik endapan batubara menjadi salah satu pertimbangan dalam pembentukan disain penambangan batubara yang dikolaborasikan dengan disiplin ilmu lain diantaranya geoteknik, hidrologi, safety and environment, dan aspek – aspek lainnya.Geoteknik monitoring and controlling merupakan salah satu aspek penting dalam menjaga kestabilan lereng selama proses pembentukan desain sampai desain tambang terbentuk. Salah satu komitmen PT Berau Coal dalam meningkatkan awareness terhadap isu kestabilan lereng adalah dengan digunaknnya Slope Stability Radar untuk membantu Geoteknik monitoring and controlling secara real time.Salah satu value yang dipegang oleh PT Berau Coal yakni continuous improvement. Didorong oleh semangat dari value tersebut, PT Berau Coal melakukan kajian dan implementasi terkait kemungkinan unit slope stability radar dapat mendukung optimasi penambangan batubara pada area-area final disain. Tujuan improvement ini adalah untuk melakukan optimasi penambangan batubara pada area final dengan menggunakan tambahan kontrol slope stability radar. Area final yang dimaksud spesifik terletak pada blok 85-81 (arah barat-timur) di Pit C1 Blok 8 Site Binungan Mine Operation Area 2 PT Berau Coal. Dalam penelitian ini penulis bersama team yang yang dibentuk (terdiri dari department Mine Planning, Mine Operation, Geoteknik dan Hidrologi) melakukan perencanaan menggunakan siklus plan, do, check, action (PDCA)  terkait kelayakan optimasi penambangan batubara menggunakan kontrol slope stability radar dari segi geoteknik, standar operasinal penambangan batubara, dan sistem tanggap darurat. Tahapan optimasi dilakukan dari arah barat (blok besar) menuju timur (blok kecil) dengan support man power yang kompeten dan kontrol dari alat slope stability radar. Hasil improvement ini menunjukan bahwa Optimasi penambangan batubara menggunakan kontrol slope stability radar memberikan kontribusi positif terhadap capaian produksi batubara sebesar 123.204 ton pada SR 6.56. Kata kunci: optimasi penambangan batubara, slope stability radar, sistem tanggap darurat.  ABSTRACT Pit C1 Block 8 Site Binungan Mine Operation Area 2 is one of the operational areas of coal mining with multi-seam characteristics, the slope of the coal seam at intervals of 12-20 degrees, the thickness of the coal seam at intervals of 0.5 - 7.5 meters, and variations in interburden thickness at intervals of 3 - 300 meters. The characteristics of coal deposits become one of the considerations in the formation of coal mining designs in collaboration with other scientific disciplines including geotechnical, hydrological, safety and environment, and other aspects.Geotechnical monitoring and controlling is one of the important aspects in maintaining the stability of slopes during the design formation process until the mine design is formed. One of PT Berau Coal's commitments in increasing awareness of the issue of slope stability is the use of the Slope Stability Radar to assist in monitoring and controlling geotechnics in real time.One of the values held by PT Berau Coal is continuous improvement. Encouraged by the spirit of this value, PT Berau Coal conducted a study and implementation related to the possibility that the slope stability radar unit could support the optimization of coal mining in the final design areas. The aim of this improvement is to optimize coal mining in the final area by using additional control of the slope stability radar. The specific final area is located in block 85-81 (west-east direction) in Pit C1 Block 8 PT Berau Coal Mine Operation Area 2 Site. In this study the authors and the team formed (consisting of the Mine Planning, Mine Operation, Geotechnical and Hydrology departments) plan using a cycle plan, do, check, action (PDCA) related to the feasibility of optimizing coal mining using slope stability radar control in terms of geotechnical engineering, coal mining operations standards, and emergency response systems. The optimization stage is carried out from the west (large block) to the east (small block) with competent support of man power and control of the slope stability radar. The results of this improvement show that optimization of coal mining using the slope stability radar control contributes positively to the achievement of coal production of 123,204 tons at SR 6.56. Keywords: coal mining optimization, slope stability radar, emergency response system.

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.

scholarly journals DETERMINATION OF METHANE DESORPTION ZONE FOR THE DESIGN OF A DRAINAGE BOREHOLE PATTERN (CASE STUDY: E4 PANEL OF THE TABAS MECHANIZED COAL MINE, IRAN)

2021 ◽  
Vol 36 (1) ◽  
pp. 61-75
Author(s):  
Ali Hosseini ◽  
Mehdi Najafi
Keyword(s):  
Coal Seam ◽  
Coal Mining ◽  
Coal Mine ◽  
Methane Emissions ◽  
Gas Content ◽  
Coal Seams ◽  
Mining Operations ◽  
Methane Drainage ◽  
Tabas Coal Mine ◽  
Drainage Borehole

Underground coal mining is known as one of the major sources of methane emissions which mainly occurs after underground coal extraction. Rock strata in-situ methane can potentially be the most significant hazard in coal mining operations. To prevent or minimize the risks of methane emissions, methane drainage approaches have been adopted by coal mines. Rock mass methane drainage is the most efficient and effective approach toward controlling methane hazards as it prevents and reduces the frequency of methane emissions, outflows into the working area and sudden outbursts of methane and rocks. The method includes drilling boreholes from the tailgate side to the unstressed zone in the roof and floor strata above and below a working coal seam. The coal seam gas content in Tabas Parvadeh I is estimated to be about 16 m3 /t, which is relatively high. Based on exploration data, five distinct coal seams have been identified (B1, B2, C1, C2 and D) at the coal deposit and currently C1 is being worked. Considering the high value of C1 gas content and surrounding rocks, the Methane Drainage System (MDS) has been utilized for gas drainage. This paper tries to determine the desorption area which is essential and helpful for the selection of an effective drilling pattern into the adjacent coal seams. In this study, the methane drainage zone in the E4 panel of the Tabas coal mine was calculated using experimental equations and a drainage borehole pattern was determined.

scholarly journals Mining Industry Impact on Environmental Sustainability, Economic Growth, Social Interaction, and Public Health: An Application of Semi-Quantitative Mathematical Approach

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 972
Author(s):  
Muhammad Mohsin ◽  
Qiang Zhu ◽  
Sobia Naseem ◽  
Muddassar Sarfraz ◽  
Larisa Ivascu
Keyword(s):  
Economic Growth ◽  
Energy Source ◽  
Coal Mining ◽  
Environmental Sustainability ◽  
Mining Industry ◽  
Provincial Government ◽  
Mining Operations ◽  
Human Needs ◽  
The Government ◽  
Operational Activities

The mining industry plays a significant role in economic growth and development. Coal is a viable renewable energy source with 185.175 billion deposits in Thar, which has not been deeply explored. Although coal is an energy source and contributes to economic development, it puts pressure on environmental sustainability. The current study investigates Sindh Engro coal mining’s impact on environmental sustainability and human needs and interest. The Folchi and Phillips Environmental Sustainability Mathematics models are employed to measure environmental sustainability. The research findings demonstrated that Sindh Engro coal mining is potentially unsustainable for the environment. The toxic gases (methane, carbon dioxide, sulfur, etc.) are released during operational activities. The four significant environment spheres (atmosphere, hydrosphere, biosphere, and lithosphere) are negatively influenced by Thar coal mining. The second part of the analysis results shows that human needs and interests have a positive and significant relationship except for human health and safety with Sindh Engro coal mining. Environmental pollution can be controlled by utilizing environmentally friendly coal mining operations and technologies. Plantation and ecological normalization can protect the species, flora, and fauna of the Thar Desert. The government of Pakistan and the provincial government of Sind should strictly check the adaptation of environmental standards. Furthermore, the researchers should explore the environmental issues and solutions so that coal mining becomes a cost-efficient and environmental-friendly energy source in Pakistan.

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