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In first mine of Chagannaoer, 2# coal seam, the mainly mined out layer, was 22.00m 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 coal’s caving was an important prerequisite which decided the mining technology of top coal caving could be
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,
Keywords: longwall top coal caving; drawing characteristic; evolution process; FDM-DEM numer-ical model 1. Introduction As one of the main methods for underground thick seam mining, longwall top coal caving (LTCC) has been fully developed and applied in China [1]. The coal seam is di-vided into two parts in LTCC: bottom coal and top coal.
model, coal excavation and caving are simulat-ed via the live or dead state of the unit. Support is implemented via a bar unit to simulate top coal caving. During on-site 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 ...
Numerical Simulation on the Evolution of Mining-Induced 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
In China, the reserve and production of thick seam coals accounts for 45% of underground coal resources and production, and the longwall top-coal caving technique (LTCC) is one of the major mining methods used to extract thick coal seams.1–3The technique was first applied in the 1940s in Russia and subsequently used in France, former Yugoslavia, Hungary, Romania, former
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 3.9 and 6.2 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.
01-03-2019 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.
01-10-2019 In China, the reserve and production of thick seam coals accounts for 45% of underground coal resources and production, and the longwall top-coal caving technique (LTCC) is one of the major mining methods used to extract thick coal seams.1, 2, 3 The technique was first applied in the 1940s in Russia and subsequently used in France, former Yugoslavia,
01-10-2018 Field studies of top-coal 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 top-coal caving mining, scholars45, 46, 47 studied the relieving effects of top-coal caving mining on rockbursts.
Keywords: longwall top coal caving; drawing characteristic; evolution process; FDM-DEM numer-ical model 1. Introduction As one of the main methods for underground thick seam mining, longwall top coal caving (LTCC) has been fully developed and applied in China [1]. The coal seam is di-vided into two parts in LTCC: bottom coal and top coal.
model, coal excavation and caving are simulat-ed via the live or dead state of the unit. Support is implemented via a bar unit to simulate top coal caving. During on-site 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 ...
Numerical analysis on movement and failure of coal and stress condition of support structures in mechanized top-coal caving in steep thick seam July 2004 Authors:
The thickness of the coal seam was 19 m, and the method of top-coal caving mining was adopted. The strata movement measurement points were arranged in the KS at different levels (22, 51 and 104 m from the coal seam). The thicknesses of the three KS were 12, 9.8 and 23 m from the bottom up.
Numerical Simulation on the Evolution of Mining-Induced 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
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 3.9 and 6.2 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.
Download Citation Numerical simulation analysis of underground pressure in fully mechanized top-coal caving face of Tingnan coal mine In order to analyze the forms of roof break and roof fall ...
The results indicate that the vertical deformation of the protected coal strata is distributed according to M within limits of protected strata, and the coal seams in pressure relief zone of ...
Sublevel Caving in a Steeply Inclined Thick Coal Seam ... mechanized top-coal caving in workface 3237 of Zhao Gezhuang coal mine in Kailuan with greater inclined and deep mining situation. is technique’s studies have ... Analysis of the Experimental Simulation. After the
Keywords: longwall top coal caving; drawing characteristic; evolution process; FDM-DEM numer-ical model 1. Introduction As one of the main methods for underground thick seam mining, longwall top coal caving (LTCC) has been fully developed and applied in China [1]. The coal seam is di-vided into two parts in LTCC: bottom coal and top coal.
Numerical approach to the top coal caving process under different coal seam thicknesses By Bin Yu, Ru Zhang, Ming-Zhong Gao, Guo Li, Ze-Tian Zhang and Qian-Ying Liu Cite
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 China’s 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 ...
Mechanized mining of Longwall top coal caving mining method was used in 1201 work face of thick soft coal seam in Du Jiacun Mine. The face is back to the wind drift along the seam floor excavation, transport drift along the seam roof boring the two crossheading basic fullcoal roadway, due to the relatively soft coal body, joints fractured, coal strength is low, and the coal-rock inclination ...
The thickness of the coal seam was 19 m, and the method of top-coal caving mining was adopted. The strata movement measurement points were arranged in the KS at different levels (22, 51 and 104 m from the coal seam). The thicknesses of the three KS were 12, 9.8 and 23 m from the bottom up.
FLAC3D was applied to researching horizontal and vertical displacement of top-coal varied with distance to coal wall under different mining height and different supporting density in 8105 mining face of Tashan Colliery.Results showed that with mining height increased first movement place of top-coal advanced and its displacement added.Increasing supporting density would add displacement of ...
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 3.9 and 6.2 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.
Analysis on the top-coal caving structure of extra-thick hard coal seam with shallow depth in fully mechanized sublevel caving mining[J]. Journal of China Coal Society, 2016, 41(2
Sublevel Caving in a Steeply Inclined Thick Coal Seam ... mechanized top-coal caving in workface 3237 of Zhao Gezhuang coal mine in Kailuan with greater inclined and deep mining situation. is technique’s studies have ... Analysis of the Experimental Simulation. After the
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