assessment of roof fall risk during retreat mining in room and pillar coal mines

Publications | Dr.Ebrahim Ghasemi

Assessment of roof fall risk during retreat mining in room and pillar coal mines. International Journal of Rock Mechanics and Mining Sciences 54, 80-89. November : 2012 : Ghasemi, E., Shahriar, K., Sharifzadeh, M., 2010. A new method for risk assessment of pillar recovery operation. Safety Science 48, 1304-1312. April

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(PDF) Improving the Method of Roof Fall Susceptibility ...

One of the most challenging safety problems in room and pillar coal mines is roof fall phenomena during retreat mining. Roof fall not only causes fatal and non-fatal injuries on miners, stoppages ...

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risk assessment Publications - Geotechpedia

assessment of roof fall risk during retreat mining in room and pillar coal mines (2013) Gurjar A., Jagadala Pradaban V. A. et al.

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Developing and following a mining plan, and using ...

miners died in a roof fall during retreat mining operations. They had just finished extracting one pillar block and were moving to the next one when the intersection they were standing in collapsed. Regrettably, this was not an iso- lated incident. Since the end of 2000, there have been 28 ground fall fatalities in U.S. coal mines.

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DEVELOPMENT OF SOFTWARE TO EVALUATE ROOF FALL …

and highly stressed. The software was developed based on the equation designed to calculate the risk of roof fall during retreat mining in room and pillar coal mines [1]. Table 1: Trend of fatal accidents in coal mines due to roof falls in India [2] Sl. No. Year No. of roof falls 1 1998 35 2 1999 33 3 2000 27 4 2001 30 5 2002 23

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Assessment of roof fall risk during retreat mining in room ...

Sep 01, 2012· One of the most challenging safety problems in room and pillar coal mines is roof fall phenomena during retreat mining. Roof fall not only causes fatal …

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Investigation in to the Risk Factors Associated with Roof ...

has done an assessment of roof fall risk during retreat mining in room and pillar workings of a underground coal mine, located in the South-eastern India. All effective parameters on roof fall during retreat mining were identified and then the role of each parameter on roof fall occurrence is explained.

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‪Ebrahim Ghasemi‬ - ‪Google Scholar‬

Assessment of roof fall risk during retreat mining in room and pillar coal mines E Ghasemi, M Ataei, K Shahriar, F Sereshki, SE Jalali, A Ramazanzadeh International Journal of Rock Mechanics and Mining Sciences 54, 80-89, 2012

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13 Review of Ground Failure Prevention Research | Mining ...

Develop a sensor-based risk management systems for roof falls in stone mines. Sensor-based risk management system for roof falls will be developed and used in 20% of underground stone mines within 4 years. Funding and time constraints within the industry may hinder sustained reduction of roof fall accidents. 7. Reduce injuries caused by rock bursts

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Control Of Mining-Induced Seismicity In The Western U.S ...

Using finite-difference modeling, experience in many U.S. mines and measurements of the pressure arch width, the author has reviewed the engineering design factors that control seismicity in room-and-pillar retreat operations for stiff stratigraphic conditions in deep western U.S. mines.

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اﺪﺧ مﺎﻧ ﻪﺑ - shahroodut.ac.ir

(2012), Assessment of roof fall risk during retreat mining in room and pillar coal mines, International Journal of Rock Mechanics and Mining Sciences, Volume 54, Pages 80–89

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Geotechnical considerations for concurrent pillar recovery ...

Room-and-pillar mining with pillar recovery has historically been associated with more than 25% of all ground fall fatalities in underground coal mines in the United States. The risk of ground falls during pillar recovery increases in multiple-seam mining conditions. The hazards associated with pillar recovery in multiple-seam mining include ...

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Assessment of roof fall risk in longwall coal mines

Jun 24, 2016· 1. Introduction. Roof fall hazards exist in virtually all underground mines independent of the mineral the mines produce. Roof falls are also one of the more prominent hazards in underground hard coal mines, which has been confirmed by statistical data from hard coal mines in the USA, India and Poland [].The longwall mining system is the main system used in Poland's hard coal mines.

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Mine Subsidence - Kentucky

Mine subsidence can be described as settlement of the ground surface as a result of readjustments of mine overburden overlying voids created during or after the mining process. These r eadjustments can be caused by roof falls, pillar failure, pillars sinking into weak floor, coal fires, and other factors (Fig. -1). Where underground mines are 4

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DEVOLOPMENT OF SOFTWARE TO EVALUATE ROOF FALL …

1. Trend of Fatal Accidents in Coal Mines due to roof falls in India 2 2. Suitable safety factor for stability of the pillars during retreat mining 8 3. Geological parameters influencing roof fall risk. 12 4. Design parameters influencing roof fall risk 13 5. Operational parameters influencing roof fall risk 13 6.

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TABLE OF CONTENTS Pillar Design and Evaluation

Calibrating Numerical Model for Room-and-Pillar Coal Mining Simulation in Weak Immediate Roof Based on In-situ Tests, A. Zingano, University Federal of Rio Grande ... Floor Stability Assessment 36. Weak Floor Stability During Perimeter Mining in the Illinois Basin Coal Mines, M. Gadde, ... Roof Falls: An Inherent Risk in Underground Coal Mining ...

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An Approach for Understanding and Promoting Coal Mine ...

Assessing the roof fall risk during retreat mining in room and pillar coal mines; evaluating explosion risk in underground coal mines; developing a comprehensive model for coal mine safety; using fuzzy set theory to assess the risk of mining equipment failure; assessing pot-hole subsidence risk in coal mine; using risk performance indicators to ...

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Pillar Removal in Retreat Mining | Axora

In room and pillar mining, retreat mining is the partial removal of enormous pillars of coal. As miners excavate underground 'rooms' of ore, pillars of untouched material are left to support the roof. Once the supply of the room has been depleted, miners begin partially removing these pillars to extract coal directly from the seam.

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Microseismic Monitoring of a Room and Pillar Retreat Coal ...

underground coal mines across the United States (Figure 1). Figure 1: Injuries (FAT, NFDL, NDL) due to the fall of a roof or rib between 2006 and 2012 (MSHA, 2015). Commonly accepted mining methods, such as longwall and room and pillar retreat, allow overburden to cave. This creates highly variable stress conditions that can be difficult to ...

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Assessment of roof fall risk in longwall coal mines

for assessing the risk of roof falls in retreated longwalls with roof caving was developed. The method, described in this article, is a combination of empirical and expert methods. 2. Background In the underground mining of hard coal deposits, various methods of assessing the risk of roof falls in mines have been developed.

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Assessment and management of roof fall risks in ...

Abstract Accidents caused by roof falls are commonly faced problems of underground coal mines. These accidents may have detrimental effects on workers in the form of injury, disability or fatality as well as mining company due to downtimes, interruptions in the mining operations, equipment breakdowns, etc. This study proposes a risk and decision analysis methodology for the assessment and ...

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Assessment of roof fall risk during retreat mining in room ...

One of the most challenging safety problems in room and pillar coal mines is roof fall phenomena during retreat mining. Roof fall not only causes …

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coal mines Publications - Geotechpedia

assessment of roof fall risk during retreat mining in room and pillar coal mines (2013) Gurjar A., Jagadala Pradaban V. A. et al.

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Assessment of roof fall risk during retreat mining in room ...

Keywords: - Underground coal mines Room and pillar Retreat mining Roof fall Risk assessment Semi-quantitative method 1. INTRODUCTION Potential roof …

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‪Ebrahim Ghasemi‬ - ‪Google Scholar‬

‪Associate Professor of Mining Engineering, Isfahan University of Technology‬ - ‪‪Cited by 982‬‬ - ‪Underground coal mining‬ - ‪Mechanical excavation‬ - ‪Risk assesment‬ - ‪Ground control‬ - ‪Building stones‬

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Failure Mechanism and Control Technology for a Large ...

Dec 24, 2020· The roof of a large-section roadway will usually undergo progressive deformation and failure under the action of deep surrounding rock stress. The large-section rectangular roadway is more prone to sudden roof caving accident under the weakly cemented formation condition, which poses great threats to operating personnel and mechanical equipment and brings about considerable difficulties to ...

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Roof falls: An inherent risk in underground coal mining

Analysis of Fatalities During Maintenance and Repair Operations in the U.S. Mining Sector By Patrick Dempsey and John Heberger Assessment of roof fall risk during retreat mining in room and pillar coal mines

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Assessment of ground instability risk of lower seam ...

Oct 07, 2020· One of the most challenging safety problems is ground instability during crossing overlying remnant pillars (CORP). Ground instability not only causes injury to …

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Major Hazard Risk Assessment Applied to Pillar …

Recent fatal injuries occurring during pillar retreat coal mining call for a better identiication of the hazards and a recognition of the associated risks.

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MSHA - Coal Mine Fatal Accident Investigation Report ...

Coal is produced on the day and second shift and occasionally on the maintenance or third shift. The mine produces 4,000 tons of raw coal daily using the room and pillar method. The mine employs 42 underground and two surface workers. The mine also employs four surface and two underground contract workers.

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Dr.Ebrahim Ghasemi | Associate Professor of Mining ...

Assessment of roof fall risk during retreat mining in room and pillar coal mines. International Journal of Rock Mechanics and Mining Sciences 54, 80-89. Ghasemi, E., Shahriar, K., Ataei, M., 2011.

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Field Investigation of a Roof Fall Accident and Large ...

Feb 15, 2018· Ebrahim G, Mohammad A, Kourosh S, Farhang S, Seyed E, Ahmad R (2012) Assessment of roof fall risk during retreat mining in room and pillar coal mines. Int J Rock Mech Min Sci 54:80–89. Google Scholar Jiang YD, Wang HW, Xue S (2012) Assessment and mitigation of coal bump risk during extraction of an island longwall panel.

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Room and pillar mining - Wikipedia

Room and pillar (variant of breast stoping), is a mining system in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars. To do this, "rooms" of ore are dug out while "pillars" of untouched material are left to support the roof overburden.Calculating the size, shape, and position of pillars is a complicated procedure, and is an area of ...

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A Study on Mining Design and Mining Method of Retreat Mining

Abstract. Retreat mining is one of the pillar recovery methods to increase the mining yield. This method has a lot of technical considerations because the coal seam or the roof recovers the pillar under relatively weak condition. Retreat mining is also a method of mining as soon as possible using continuous miner and slowly collapsing the goef.

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