Numerical simulation of coal pillar strength
WebThe adequate stability of coal pillars left behind is the prerequisite to minimise strata convergence and mining subsidence. The room and pillar mining method is usually … Web5 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 …
Numerical simulation of coal pillar strength
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Web1 dec. 2024 · A certain width of coal pillars between each roadway should be retained to ensure the stability of the surrounding rocks of roadways, which results in great resource waste. Therefore, mines should optimize the roadway layout of the fully mechanized mining surface with the large mining height in high-gas mines and put forward the corresponding … 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, …
Web1 jun. 2009 · Numerical simulation approach of coal pillar Appropriate constitutive behaviour is an essential requirement of numerical modelling. The fundamental approach for determination of constitutive behaviour of coal-mass is tri-axial testing. It has been observed that stress–strain behaviour of coal is affected by its size due to inherent … Web16 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 …
Web27 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]. 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. …
WebThe inclined coal pillars, formed during the underground extraction of the inclined coal seam, are different from the flat coal pillars due to the high strength anisotropy of 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 … ge air conditioner settingWeb28 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 … ge air conditioner superthrustWeb11 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 … ge air conditioner sleep modeWebIn 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 … ge air conditioner sleeve unitsWeb21 aug. 2024 · In this study, the Lagrange element strength reduction method is used to explore slope stability and as an evaluation method of underground mining of end-slope coal in a rock-stability analysis. A numerical analysis model is established herein using the geological conditions for mining in a coordinated open pit with an underground mining … day tour rizalWeb6 apr. 2024 · By comparing the development process of cracks, stress distribution, and rock displacement under different conditions, the research results indicate that the width of … ge air conditioner wallWeb1 feb. 2024 · This paper adopts an integrated method of field test and numerical simulation to study coal pillar width and surrounding rock control of gob-side entry in extra-thick coal seam. Field test showed… Expand 5 Comprehensive analysis control effect of faults on the height of fractured water-conducting zone in longwall mining day tours amsterdam