Numerical simulation of coal pillar strength

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August undefined, 2024

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 Web13 sep. 2024 · Coal pillar strength and load Calculation. Sep. 13, 2024. • 0 likes • 61 views. Download Now. Download to read offline. Engineering. Calculation of FOS of coal pillar. …

A review of coal pillar strength formulas SpringerLink

WebPillar is one of the most important load bearing members in underground mines and plays a crucial role in sustaining the functional integrity of openings.With mining progressing to … 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 … arantza madariaga

Instability Control of Roadway Surrounding Rock in Close-Distance Coal …

Web2. Empirical pillar strength formulas Following the Coalbrook disaster, a major coal-pillar research program was initiated in South Africa. One of the main objectives of this research was to establish the in situ strength of coal pillars. Using the back-calculation approach Salamon and Munro [9] analyzed 125 case histories involving coal-pillar ... WebNumerical computation of average pillar stress and implications for pillar design pillar loads11,9. In estimating pillar strength, a typical approach is to identify pillars … Web1 dec. 2001 · A study of the strength of coal pillars A. Salamon, M. Munro Engineering 1967 A formula, which defines approximately the strength of coal pillars in South … bakara suresi 6. sayfa

Research on Surrounding Rock Control Technology in Two Hard …

OneMine Numerical Modelling Based Investigation of Coal Pillar ...

Web19 jun. 1989 · This simulation was based upon material properties developed from laboratory tests of coal cubes and examined against coal pillar strength data … WebIn order to solve the problems of roadway stability and easy instability under repeated mining of close-distance coal seam groups, the mechanism and control technology of surrounding rock instability under repeated mining were studied via indoor testing, field testing, physical similarity simulation experiment, and numerical simulation. The … bakara suresi 70 dkWebThe potential of sudden water accidents induced by damage to the bottom slab that forms a water channel due to the action of karst water calls for research on the damage law of coal seam floors under the coupling effect of mining and karst water. In this study, the coupling situation of karst water and floor rock was analyzed based on the theory of rock … arantzako aterpea

"WebNumerical Simulation Study on Mechanical Characteristics and Width Optimization of Narrow Coal Pillar in Gob-Side Coal Seam Tunnel Pengxiang Zhao 1,2, Wenjin Zhang … " - Numerical simulation of coal pillar strength

Numerical simulation of coal pillar strength

Numerical estimation of pillar strength in coal mines

Web1 jun. 2009 · The statistical expressions for estimation of pillar strength for Indian coal mines and post-failure modulus have been developed by analyzing the results of the … WebArticle “Numerical simulation of coal pillar strength” Detailed information of the J-GLOBAL is a service based on the concept of Linking, Expanding, and Sparking, linking …

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WebThe simulated pillar strength curve under strong roof and floor compared favorably with measured peak strengths of four failed pillars in two coal mines in southwestern Virginia (figure 2) and is in general agreement with many existing coal pillar design formulas at w/h < 5. 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.

Web8 dec. 2024 · Meanwhile, the lower coal working face and pillar could effectively avoid the staggered distance between the upper and the lower coal pillars in the stress concentration area of the upper coal seam. 4.2 Numerical simulation of double-seam and different staggered distance scheme optimization 4.2.1 Numerical simulation scheme of double … Web7 jan. 2024 · Numerical modeling was used to study the influence of the bearing stress and target time strength on the development of the yielding zone at the coal pillar ribs. The coefficients of the...

WebThis 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 … WebNumerical and experimental analyses for rubber-sand particle mixtures applied in high-filled cut-and-cover tunnels. Author links open overlay panel Bin Zhuo a, Muyuan Zhu a, Yong Fang a, Feiyang Wang a, Yuxiang Yao a, Sheng Li …

Web17 apr. 2024 · The elasto-plastic numerical simulation with the ubiquitous joint constitutive model is carried out by FLAC3D (Itasca 2024) to generate the stress tensor within the …

WebThe statistical expressions for estimation of pillar strength for Indian coal mines and post-failure modulus have been developed by analyzing the results of the simulations. For … bakara suresi 73. ayetWeb3 apr. 2024 · 1. Introduction. The slope angle, mining boundary, changes of the coal seam thickness, etc. are the main reasons that many coal resources remain under the end-walls in open-pit coal mines [1–3].Because of the undeveloped mining technology and low economic benefits, those resources were discarded or exploited using the room and … arantzako mendi itzulia 2022WebTherefore, it is important to take measures to strengthen support near the coal pillar and to control asymmetric deformation when the coal-rock rise is influenced by repeated mining. ... Chen, X.G.; Wang, Y.; Mei, Y.; Zhang, X. Numerical simulation on zonal disintegration in deep surrounding rock mass. Sci. World. J. 2014, 2014, 379326. bakara suresi 74. ayetWebThe statistical expressions for estimation of pillar strength for Indian coal mines and post-failure modulus have been developed by analyzing the results of the simulations. For … arantza muñoz aramburuWeb1 jan. 2024 · High-grade coal is locked in the shaft protective pillars at 900 m below surface in the Czech part of Upper Silesian Coal Basin. To optimise recovery of coal from the … arantza mendizabal abadWeb16 jan. 2024 · Using numerical simulation, Cheng et al estimated the vertical stress distribution within the coal pillar and concluded that the vertical stress is characterized by a ‘single peak’ when the coal pillar width is 3–15 m, while the vertical stress is characterized by a ‘double peak’ when the coal pillar is 20 m wide, as shown in figure 4 (Cheng et al … bakara suresi 73Web11 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 … arantza meaning