Some experiments in-situ and in laboratory to determine the physico-mechanical properties of coal

Some experiments in-situ and in laboratory to determine the physico-mechanical properties of coal

18 Pages · 2009 · 335 KB · English

A number of simple field and laboratory studies and tests were carried out to visualize the nature and variation extent of mechanical properties with emphasis on cuttability across CI coal seam in Parvadel mine of Tabas located in east of Iran. Selection of the suitable coal winning machines and of

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OSPODARKA SUROWCAMI MINERALNYMI Tom 25 2009 Zeszyt 3 K SHAHRIAR*, E BAKHTAVAR**, A MOEINIZADEH*** Some experimentsinsituand in laboratory to determine the physicomechanical properties of coal Introduction Coal is a concentrated form of invaluable natural energy Its proper exploitation is important not only for economical development but also for environmental, ecological and conservation points of view (Singh et al 1999) The increasing demand for energy is being met mainly by coal in some Asian countries As such, the coal mining trend of the countries is different from that of many developed countries The coal producing target is being increased every year and, to achieve it, the coal mining industry is moving fast towards mechanization (Singh et al 1995) It means, one of the most important factors affecting the production rates in mining or civil engineering projects is theperformance of the mechanical excavators such as road headers, continuous miners, shearers etc The prediction of the machine performance plays a major role in decision making for the practicing engineer and the cuttability of rock is the key factor in performance prediction (Rostami et al 1994) A large amount of research work has been done to visualize the cutting characteristics of coal seams in different countries, and a number of testing procedures has been suggested for the selection of coaling machines (Singh et al 1995) Rock cuttabilityis usually determined with the aid of la boratory cutting rigs which need highly sophisticated instrumentation (Bilgin et al 1997 a, b) and research engineers are always interested in finding a method to predict rock cuttability on the based of the simple rock properties Unfortunately, no such detailed investigation has been conducted for the Iranian coal seams and a wide variation of geomining conditions * Department of Mining & Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran ** Division of Mining Engineering, Urmia University of Technology, Urmia, Iran *** Science & Research Branch, Islamic Azad University, Tehran, Iran restricts direct adoption of the foreign normsand procedures Therefore an extensive field and laboratory study in this paper was undertaken as a basis for cuttability assessment which is related to the selection of the proper coaling machines and of the most effective and fitness bits for the coal winning machine for the C1 coal seam of Parvadel mine of Tabas located in east of Iran The field and laboratory data of coal cuttability was estimated due to comparing the results of uniaxial strength, insitu shear strength tests, and also cuttability, strength index, expanding bolt and MRE penetration tests on C1 coal seam with lab results gained in other countries 1 Literature review Although the first coal retrieval machine wasdeveloped and used in a British coal mine more than 130 years ago (Walker 1902), but most of the studies on coal cutting were done only within the last five decades The effect of cutting tool and machine parameters, geomining conditions and physicomechanical properties of coal over cutting force was studied by a number of authors and, theoretical aspects of coal cutting were detailed in the late 1950s (Evans 1958) Merchant’s theory (Merchant 1944) of basic mechanics of the metal cutting process was applied to give an analytical equation of the cutting force for coal/rock cutting (Roxborough, Rispin 1973) Widely accepted rock cuttability assessment for the performance estimation of road header is the specific energy measured from core cutting tests (McFeatSmith, Fowell 1977, 1979) Detailed laboratory andinsituinvestigations carried out by Fowell and McFeatSmith showed that there is a close relationship between specific energy values and the performance of medium and heavy weight “road headers” (McFeatSmith, Fowell 1977; Fowell, Johson 1982, 1991; Johson, Fowell 1984) In 1972, Hughes represented an equation for calculating the specific energy (Hughes 1972) Farmer, Garritty and Poole (1987) showed that excavation rate in m 3/h might be predicted correctly for a given power of road header, using specific energy values as the represented equation by Hughes in 1972, (Farmer, Garritty 1987; Poole

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