Numerical simulation and analysis of underground
Numerical analysis on top coal movement and stress distribution in mechanized top caving mining of thick coal seam. China Mining Magazine, 14(10): 5659. The physical parameters of the rock
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Numerical analysis on top coal movement and stress distribution in mechanized top caving mining of thick coal seam. China Mining Magazine, 14(10): 5659. The physical parameters of the rock
Numerical Analysis of Top Coal Recovery Ratio by using Discrete Element Method 28 Fig. 1: Correspondence between caving interval and top coal recovery ratio Fig. 2: Location Map of Thar Coalfield Fig. 3: Highlights of LTCC method
#0183;#32;1. Introduction. Longwall Top Coal Caving (LTCC) can provide substantially less economic sensitivity and a reduced level of technical risk over other thick seam mining methods. 1 A reliable evaluation of LTCC''s applicability at the feasibility stage of a new mining project is therefore of importance to the effective and productive extraction of thick coal seams.
#0183;#32; Model for topcoal caving. Steps of the 3D modeling of the M3 longwall face and topcoal caving are given as follows: 1. In order to obtain proper results from models formed to analyze caving of top coal, only a small part of the face was modeled. This consisted of the area of two shields located at the face center.
model, coal excavation and caving are simulated via the live or dead state of the unit. Support is implemented via a bar unit to simulate top coal caving. During onsite coal caving, top coal caving occurs once every 2 m. Therefore, during the numeric simulation, the top coal is divided into 25 blocks; the sequential caving process is shown in
In LW 5302, the longwall top coal caving (LTCC) method was used to extract coal seam No. 3. The mining and caving heights of coal seam No. 3 were and m, respectively. In Figure 1, it can be seen that LW 5302 was 120 m wide by 754 m long. The northwest side was adjacent to the longwall face 5301 (LW 5301) gob.
#0183;#32;In China, the reserve and production of thick seam coals accounts for 45% of underground coal resources and production, and the longwall topcoal caving technique (LTCC) is one of the major mining methods used to extract thick coal, 2, 3 The technique was first applied in the 1940s in Russia and subsequently used in France, former Yugoslavia, Hungary, Romania, former
#0183;#32;Field studies of topcoal caving mining have been conducted in Tangshan 43 and Zhaogezhuang 44 mines in China to prevent rockbursts and obtained good effects as a result. By analysing the overburden and abutment stress distributions in topcoal caving mining, scholars45, 46, 47 studied the relieving effects of topcoal caving mining on rockbursts.
The Longwall Top Coal Caving (LTCC) has been the preferred underground mining method that has been developed and then accepted by its guaranteed results in Chinas coal mining industry. In this research paper, a 12 meter thick coal seam has been modeled successfully and the mechanism of top coal demonstrated and top coal recovery ratio was
Numerical Simulation on the Evolution of MiningInduced Fracture Network in a Coal Seam and Its Overburden under the Top Coal Caving Method Guangdi Deng, 1, 2 Heping Xie, 2, 3 Mingzhong Gao, 2, 3 Cong Li, 2, 3 and Zhiqiang He 2, 3
#0183;#32; Model for topcoal caving. Steps of the 3D modeling of the M3 longwall face and topcoal caving are given as follows: 1. In order to obtain proper results from models formed to analyze caving of top coal, only a small part of the face was modeled. This consisted of the area of two shields located at the face center.
Numerical Analysis on Top Coal Caving of 2# Coal Seam in. In first mine of Chagannaoer, 2# coal seam, the mainly mined out layer, was thickness in average. In order to meet the requirements of production ability, the mine was planned to apply mining technology of fully mechanized caving.
Numerical Analysis of Top Coal Recovery Ratio by using Discrete Element Method. a 12 m thick coal seam with cutting to caving height ratios like 1:2 and 1:3 has been modelled,
Numerical analysis on movement and failure of coal and stress condition of support structures in mechanized topcoal caving in steep thick seam July 2004 Authors:
Download Citation | Numerical Analysis on Top Coal Caving of 2# Coal Seam in First Mine of Chagannaoer | In first mine of Chagannaoer, 2# coal seam, the mainly mined out layer, was
Numerical Analysis of the Effect of Coal Seam . In this paper, detailed caving simulations are performed using a 2D distinct element method DEM code, UDEC, to study the effect of various critical parameters on top coal cavability. The numerical analysis evidently shows that the coal deformation modulus, coal discontinuities, and top coal
In first mine of Chagannaoer, 2# coal seam, the mainly mined out layer, was thickness in average. In order to meet the requirements of production ability, the mine was planned to apply mining technology of fully mechanized caving. Good or bad of top coals caving was an important prerequisite which decided the mining technology of top coal caving could be chosen or not.
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