Frontiers A case study of pillar extraction
In order to increase the mine life and improve the recovery rate of resources, this paper takes the 16E104, 16E106, and 16E108 working faces of Jisuo Coal Mine as the engineering Thirty years ago, the analysis of longwall pillar stability (ALPS) inaugurated a new era in coal pillar design. ALPS was the first empirical pillar design technique to Analysis of coal pillar stability (ACPS): A new generation of pillar
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Pillar Stability Analysis for Partial Pillar Extraction. A
Introduction The Room-and-pillar (R&P) method is a widely utilized underground mining method used in coal, limestone and metal mines. The basic premise In this paper, the effect of line of extraction on pillar stability has been studied in the context of an Indian underground coal mine by way of a comparative analysis through numerical Full article: Numerical study of stability of coal pillars under
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Evaluation of different methods of pillar recovery in coal mining
Most mining engineers decide to extract pillars to decrease the loss of coal in room-and-pillar mining. There are a few basic methods of pillar recovery and a number For seams of height in the range of 0.4–0.6 m (1.3–2 ft) or thick and soft seams for irregular boundary coal blocks of a mining property or extraction of coal pillars, Advances in coal mining technology and sustainable mining
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An Experimental Study of Industrial Site and Shaft Pillar Mining
Engineering site and shaft pillars are excavated to prolong the life of collieries and excavate more underground coal. The Jinggezhuang colliery (‘JGZ’) is a Partial extraction techniques, such as strip pillar mining or room-and-pillar mining, are efficient methods to extract coal. Pillar stress is a critical property for pillar design and for the assessment of mine stability after partial Sustainability Free Full-Text Mine Size Effects on
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Full article: Numerical study of stability of coal pillars under
The maximum stress observed was 16.79 (MPa) for the Step diagonal line of extraction. But the minimum stress is the same for different line of extraction since pillar-1 is the first pillar extracted in all different line of extraction. Mining is a hazardous profession and considered as a war against the unpredictable forces of nature.A fully mechanised mining method using continuous miner (CM) for pillar extraction in single-pass is introduced in the year 2010 at Pinoura Mine of South E Field and Simulation Studies for Mechanised Depillaring below Incompetent Geological Formations of an Indian Coal Mine SpringerLinkField and Simulation Studies for Mechanised Depillaring
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Coal Pillar Extraction Under Weak Roof SpringerLink
A mining method for pillar extraction was introduced at the Pinoura Mine in the South Eastern Coalfields Limited of Bilaspur, India, in the year 2010. It is a valuable method for the winning of coal resulting in 75% final recovery compared to high-capital-costs methods (i.e. longwall mining) in a given geomining condition.Abstract. This paper investigates the applicability and operational characteristics of different partial pillar extraction methods for a room-and-pillar coal mining project located in the region of southern Africa. Three partial pillar extraction methods, i.e. the Pillar Splitting method, the Duncan method and the Lift Left-Right method are Pillar Stability Analysis for Partial Pillar Extraction. A
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Coal mining Underground mining Britannica
Often the extraction of coal from the seam during mine development is called “first mining”; the extraction of the remaining seam is called “second mining.” Mining methods. Modern underground coal-mining methods can be classified into four distinct categories: room-and-pillar, longwall, shortwall, and thick-seam. Room-and-pillar miningshallow cover pillar extraction, there is an audible increase in coal pillar popping and roof thumping and bouncing at greater depths. Squeezes (also called rides or pillar runs) are nonviolent gradual pillar failures that cause noticeable coal sloughage and roof-to-floor convergence. It may take hours, days, or even weeks for a section toDeep Cover Pillar Extraction in the U.S. Coalfields
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Deployment of Continuous Miner in under Ground Coal Mine
Continuous miners are generally suitable for a room and pillar mining system. The CMT can develop a virgin seam for coal extraction by the bord and pillar method. The size of pillars left for withstanding the roof load is guided by the coal mine regulations . Introducing CM in virgin seam depends on the mining method; once the About 80–90% of coal recovery during pillar extraction (known as depillaring) in the commonly used Bord and Pillar (B&P) method of coal mining encounters strata control issues. Therefore, the depillaring operation requires underground instrumentation and their monitoring by skilled manpower, in addition to the efficient Roof sagging limit in an early warning system for safe coal pillar
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Numerical simulation of depillaring panel at higher depth
Extraction of coal by bord and pillar mining method poses many challenges with respect to the problem of strata control at higher depth. A depillaring panel at deep cover (greater than 525 m) is analysed the stability of pillar and rib using three-dimensional numerical modelling. From the numerical modelling, it was found that ribs' safetyInstrumentation and monitoring is undertaken aiming at evaluation of changing values of rock mechanic parameters, namely, dilation, load, convergence, and stress, during mining for a safe strata control. It enables the mining practitioners to anticipate roof fall–related dangers in advance and taking subsequent preventive measures while Development of a model to estimate strata behavior during
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Coal mining trends, approaches, and safety hazards: a brief
In South Africa, 80% coal is produced from province of Mpumalanga, where bord and pillar mining method is commonly adopted for extraction of coal. From total production of coal, 60% is excavated from the underground while 40% of coal production is from open cast mining.Coal mining, extraction of coal deposits from the surface of Earth from underground. Coal has been used since the Bronze Age, 3,000 to 4,000 years ago, and was the basic energy source that fueled Coal mining Definition, History, Types, & Facts
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(PDF) Pillar design in coal mines ResearchGate
The paper points out that bord-and-pillar mining is the most important method of coal extraction in South African underground coal mines, and advocates that pillar design procedures should beThirty years ago, the analysis of longwall pillar stability (ALPS) inaugurated a new era in coal pillar design. ALPS was the first empirical pillar design technique to consider the abutment loads that arise from full extraction, and the first to be calibrated using an extensive database of longwall mining case histories.Analysis of coal pillar stability (ACPS): A new generation of pillar
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(PDF) The Duncan Method of Partial Pillar Extraction at Tasman Mine
The adopted partial extraction method involves stripping the developed square pillars on four-sides on retreat to leave a load-bearing remnant coal pillar. The system of partial extraction hasThe integrated extraction of coal and gas combines coal mining with gas capture. Taking into account the gas deposition and flow conditions in the Chinese coal basins, this paper describes the status of the theory and key technologies of this integrated extraction system, and presents its application and practice in the Shaqu, Zhongxing, Theory and practice of integrated coal production and gas extraction
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Numerical Investigation of the Dynamic Mechanical State of a Coal
This study presents a numerical investigation on the dynamic mechanical state of a coal pillar and the assessment of the coal bump risk during extraction using the longwall mining method. The present research indicates that there is an intact core, even when the peak pillar strength has been exceeded under uniaxial compression. This Bord and pillar (B & P) is the most preferred method of underground coal mining in India, considering the geo mining complexities.The B & P method comprises of two stages, namely, development and depillaring. The traditional mining practice adopts the conventional method (drill and blast) to extract the coal using SDL/LHD machines. The Numerical Study of Pillars Behavior in Continuous Miner
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Fracturing of an Euler–Bernoulli beam in coal mine pillar extraction
The problem of pillar extraction in a coal mine was submitted to the Mathematics in Industry Study Group which was held at the University of the Witwatersrand, Johannesburg, from 10 to 14 January 2011. the strata behaviour in an underground long-wall mining face (Ju and Xu, 2013), and analysing the roof collapse after extraction of a
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