Panel Width Affected by Rock Mass Classifications (Abu-Tartur Phosphate Mines)

Hussein, M. A.; Imbaby, S.S.; Ibrahim, Ahmed

doi:10.21608/jesaun.2013.114796

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…The efficiency and durability of longwall productivity is hampered by the undesired idle time caused by roof collapses and hydraulic support problems [4]. From studying the Main Roof Tilt (MRT) in longwall faces, it can be found that it affects the working stability [5]. Many researchers have presented a variety of approaches, models, and theories to interpret the rock pressure in longwall faces, load conditions of the roof, and evaluate hydraulic support performance.…”

Section: Introductionmentioning

confidence: 99%

Current Theories and Concepts for the Determination of Roof Loading over the Hydraulic Supports in Longwall Faces

Haroon

Heshmat²,

Imbaby³

et al. 2022

Journal of Petroleum and Mining Engineering

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Underground mining of ores affects in-situ rock conditions, resulting in a sequence of strata motions. Roof rock pressure, which is the basis of all ground control issues, is caused by these instabilities. The hydraulic supports are subjected to excessive stress due to the roof rock pressure. The correct forecast of Rock Roof Loading (RRL) provides longwall face stability during ore exploitation, allowing the hydraulic supports to move more freely. This paper presents some of the current theories, approaches, and concepts for the determination of roof loading on longwall faces, with emphasis on the current gaps. This could improve the ability to manage the roof during mining workings, and govern the roof loading conditions and the supporting system. From this study, it can be seen that the periodic weighting of the main roof is an important aspect in the determination of loading requirements. Moreover, many loading calculation methods failed to take into consideration the swelling pressure of immediate roof rocks, and the tilting of the main roof blocks, which exert excessive loads on the supporting systems.

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Section: Introductionmentioning

confidence: 99%

Current Theories and Concepts for the Determination of Roof Loading over the Hydraulic Supports in Longwall Faces

Haroon

Heshmat²,

Imbaby³

et al. 2022

Journal of Petroleum and Mining Engineering

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show abstract

“…This technique produces two parameters, namely resistivity and chargeability, which quite well distinguishes the mineral deposit content in rocks [4][5][6]. The DCIP technique has demonstrated to be a useful and effective tool in the exploration of mineral resources (metallic and non-metallic) [7][8][9][10]. Especially, the IP method is widely used for mineral exploration because it is the only geophysical technique that has the ability to discriminate conductive or semi-conductive minerals disseminated in high electrical resistivity background (host rock) [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Geoelectrical tomography data processing and interpretation for Pb-Zn-Ag mineral exploration in Nash Creek, Canada

et al. 2020

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The geoelectrical tomography survey was carried out to explore and characterize a (Zn-Pb-Ag) sulphide deposit in Nash Creek (NC), New Brunswick province, Canada. The exploration strategy has been conducted by the 2-D survey for a well-cut grid consisting of twelve surface lines (profiles) each around 2 km long, and 300 m apart, for the total area around 9.5 km2. The datasets (resistivity and induced polarization) were acquired using the Iris El-Rec Pro system with pole-dipole electrodes array spaced 50 m apart, and ten levels of data datum. The results of the 2-D inversion revealed that the underground resistivity and chargeability values in the exploration area have a range of (5 to 1300 Ωm) and (0-9.5 mV/V), respectively. The sulphide mineralization zones in the exploration area are characterized by moderate resistivity values (150-300 Ωm) and moderate to low chargeability values (>5.5 mV/V), with a depth of around (90140 m) from the surface. The 3-D visualization model clearly reveals that three main zones of sulphide mineralization are present in the exploration area. The predicted geological reserve of the sulphide ore in the exploration area was calculated. The inverted models revealed a good agreement with the existing geological features in the exploration area.

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Load Calculations and Selection of the Powered Supports Based on Rock Mass Classification and Other Formulae for Abu-Tartur Longwall Phosphate Mining Conditions

Hussein

Ibrahim

Imbaby

2013

JES. Journal of Engineering Sciences

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The safe operations at longwall face depend on the type and capacity of the powered roof supports. At Abu-Tartur longwall phosphate mine, two types of powered roof support with various capacities were tried earlier. The two leg shield power supports was applied finally. The main problem at Abu-Tartur longwall mines is the high frequency of roof rock falls during face advance. Roof collapse is due to an inadequate capacity of the chosen powered supports. So, in this paper the load exerted on the shield support is calculated by different methods and taking into consideration the actual roof conditions by rock mass classification system to select the suitable type of the supports. From these calculations, it is found that the average maximum pressure on the supports is about 416t/m with the yield pressure on the shield support of a value of 520t/m. Different items are recommended such as; increase the rate of the advance, exploit ore in two consecutive shifts, decrease the period of the face stoppage and small thickness about 30cm from phosphate ore should be left in the roof during exploitation to ensure stability during face advance. The following shearer is recommended to increase rate of face advance. The specification of this shearer are model Cat EL 3000/2011with typical length 15.2 m, seam thickness range from 2.5 to 5.5 m, cutting drum diameter up to 2.7 m, haulage speed up to 32 m per min, cutting drum speed 54.3 rpm and bits drum hardness up to 68.4 Mpa is to secure high rate of face advance. Shield support model Kottadih, CDFI,France, 2x470 is selected for Abu-Tartur mining conditions to support the face during working.

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Panel Width Affected by Rock Mass Classifications (Abu-Tartur Phosphate Mines)

Cited by 4 publications

References 12 publications

Current Theories and Concepts for the Determination of Roof Loading over the Hydraulic Supports in Longwall Faces

Current Theories and Concepts for the Determination of Roof Loading over the Hydraulic Supports in Longwall Faces

Geoelectrical tomography data processing and interpretation for Pb-Zn-Ag mineral exploration in Nash Creek, Canada

Load Calculations and Selection of the Powered Supports Based on Rock Mass Classification and Other Formulae for Abu-Tartur Longwall Phosphate Mining Conditions

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