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Numerical simulation of coal pillar strength

Web1 jun. 2009 · In the simulation process, the evolution of the strength, damage ratio, water pressure, stress, strain, and other parameters in coal pillars under the effect of mining … WebThe coal 8210 big mining height of the Datong mine Jin hua gong face in the process of mining airport coal pillar fried state a, floor deformation intense, serious kick drum, eventually leading to rock failure .In the severe cases, easily induced by shock pressure and other disasters ,these have serious impact on the efficient production of face security in …

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Web20 mrt. 2024 · The backfilling of the remaining goaf can maintain the stability of the coal pillar well, but the coal pillar in the unfilled zone may still be unstable. In this paper, the … WebJaiswal, Ashok, Shrivastva, B.K. (2009): Numerical simulation of coal pillar strength, International Journal of Rock Mechanics & Mining Sciences; Volume 46, 779-788. has … civil engineering in the philippines history https://5amuel.com

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Web4 apr. 2024 · The numerical simulation results show that the coal pillar at 10 m in front of the coal face is in plastic state, and the plastic areas in solid coal and roof are 3.5 and 3.2 m, respectively. The peak zone of deviatoric stress is mainly located at 4 m deep in coal pillar and 3.5 m deep in solid coal, and 22 m in front of the coal face is in high deviatoric … WebThe mining of the 20 metres wide vein was conducted in 17 stages and simulated by deleting elements within the 5 metres high mining slice. The mechanical parameters used in the model are based on the measurements in the laboratory and are listed in Table 1. According to insitu stress measurement (Sulistianto et al, 2006), stress Web19 jun. 1989 · This simulation was based upon material properties developed from laboratory tests of coal cubes and examined against coal pillar strength data … civil engineering in trinidad and tobago

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Numerical simulation of coal pillar strength

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WebIn the theoretical model, pillar failure criteria are significant factors for calculating coal pillar strength, and the primary factors for instability evaluation are noted.

Numerical simulation of coal pillar strength

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WebThis paper presents a new numerical modeling procedure and design principle for longwall pillar design with the assistance of numerical simulation of FLAC3D. A coal mine located in Yanzhou city, Shandong Province, China, was selected for this case study. A meticulo Web11 jun. 2024 · It is almost similar to the Bieniawski formula where in-situ coal strength could be correlated with strength of 1 in 3 coal specimen: (19) Pillar strength ( MPa ) = σ c 0.66 2.39 [ 0.36 ( w / h ) + 0.64 ] The numerical modelling approach has the ability to estimate peak strength as well as the post-failure behaviour of coal pillars.

WebKeywords: numerICAL sImuLAtIon, CoAL pILLAr, pLAstIC zone,go,CoAFALmIne sAFety 1 Introduction With the development of modern computer sci-ence, numerical simulation research has found wide applications in many engineering fields. Watanabe, H. and Otaka. M.studied coal gasification in entrained flow coal gasifier by numerical simulation … WebThe mining of the 20 metres wide vein was conducted in 17 stages and simulated by deleting elements within the 5 metres high mining slice. The mechanical parameters …

Web28 jul. 2024 · The position where the highest pressure of the coal pillar occurs can be calculated by the following formula: where X0 is the distance between the fracture line of key block B and gob, m; x0 is the place where peak stress occurs; c is the cohesion of the coal, 3.46 MPa; is the inner friction angle of the coal, 22°; P is the support resistance of … http://www.ijlemr.com/papers/volume8-issue04/2-IJLEMR-77788.pdf

WebKeywords: numerICAL sImuLAtIon, CoAL pILLAr, pLAstIC zone,go,CoAFALmIne sAFety 1 Introduction With the development of modern computer sci-ence, numerical …

WebKeywords: Numerical simulation, Overburden breaking law, Mining stress, Coal displacement. I. Introduction In China, coal seam reserves with the thin bedrock and … doug martin lake michigan credit unionWebNumerical computation of average pillar stress and implications for pillar design pillar loads11,9. In estimating pillar strength, a typical approach is to identify pillars … doug martin morgan and morganWebNumerical simulation and theoretical calculation were also performed in this study. In the numerical simulation, the coal seam with a buried depth of 122 m and a thickness of 3 m is mined... doug marrone firedWeb5 mrt. 2024 · Based on the geological conditions of Pingmei No.6 coal seam, a theoretical analysis, numerical simulation, and industrial experiments are carried out to calculate the reasonable width of chain pillars, analyze the lateral support stress distribution law near the gob side, investigate the relationship between the coal pillar stress distribution, roadway … doug mason obituaryWeb27 apr. 2024 · In contrast to laboratory experiments and the empirical method, numerical simulation is capable of capturing the stress state and damage evolution in coal mass and is therefore helpful in clarifying the associated coal failure mechanism under static combined with dynamic condition [16]. doug massingillWebtrend. Some predicted that pillar strength would increase exponentially as the w/h ratio increased, others predicted it would tend towards a maximum limiting value, and still … civil engineering job in bangladeshWebThis study considered the mining roadway with coal pillar protection in the fully mechanized caving face of the Dananhu No.1 Coal Mine, China. Theoretical analysis, numerical … doug maslow lawsuit