The stability of the surrounding rock is the key problem regarding the normal use of coal mine roadways, and the floor heave of roadways is one of the key factors that can restrict high-yield and high-efficiency mining. Based on the 1305 auxiliary transportation roadway geological conditions in the Dananhu No. 1 Coal Mine, Xinjiang, the …
Fully mechanized top-coal caving mining is one of the main methods of thick seam mining 1,2,3,4,5.Top-coal is the only load transfer medium between support and roof, and its physical and ...
1.Introduction. With the continuous exploitation of coal resources, traditional mining technologies are facing increasing challenges. Longwall top-coal caving (LTCC) mining is an effective method for mining thick coal seams [1], and the key to its successful implementation lies in the control and optimization of the coal caving process [2].With …
Abstract. This paper describes history of the longwall top coal caving technology. The devices capable to promote wider application of LTCC are discussed. The advantages, …
General situation of engineering background of Wudong coal mine. Wudong Coal Mine, affiliated with China National Energy Group Xinjiang Energy Co., Ltd., was established on January 5, 2013.
Longwall top coal caving (LTCC) is a special type of mining method commonly used to extract coal seams thicker than 4.5 m (Wang et al. 2018a).This method originated in France and Eastern Europe in the 1950s for extracting coal pillars from marginal areas of coalfields (Wang et al. 2014).LTCC is mainly used in China these …
The top-coal caving of No. 6 coal seam was systematically evaluated with statistical results of coal-seam recovery height (h re) and mining–caving ratio (R mc). ... an indicator for the division of LLTCC feasible regions in the Laosangou mining field, which is based on the R mc, h re, coal-wall stability, and equipment selection. The results ...
With the improvement of highly-powered face equipment and the method itself, in the past 15 years, LTCC was introduced to more challenging geological conditions, such as …
Abstract The pre-blasting zones have a significant influence on the coal broken and the recovery rate of the top coal caving mining. This paper explores the coal movement mechanism in the top coal with pre-blasting zones based on the geological parameters of Jiangcang No. 1 mine in the western of China. The steeply inclined ultra …
The Longwall Top-Coal Caving (LTCC) method makes use of a second conveyor and the natural force of gravity to recover coal above the shearer's recommended height once the face has advanced.
Under the condition of fully mechanized top coal caving in close-distance coal seams, the surrounding rock of the stopping space easily loses stability during the withdrawal of mining equipment in the working face because the lower coal seam working face is located under the goaf and the overburden rock has a large range of complex …
The paper systematically summarized the main achievements of the fully mechanized longwall top-coal caving technology in passed 20 years in China and the conclusion and understanding on the related issues. The paper provided the issues of the theoretical and technical researches to be strengthened in the next step for the fully mechanized …
The top-coal caving longwall mining is one of the major mining methods for extracting thick coal seams in China. The top-coal caving mining was estimated to have produced about 0.6 billion metric tons every year, accounts for 18% of underground coal mining in China [3].The major features of the top-coal caving mining are that a …
Drawing support is one of the unique equipment for longwall top coal caving (LTCC) technology in coal mine, whose structure has a significant effect on the top coal drawing mechanism. This research systemically investigates the effect of the dip angle of shield beam ( α ), length ratio of shield beam to tail beam ( R _ L ), and rotation angle …
Longwall top coal caving (LTCC) is a part of longwall mining that is applicable for thick coal seams. China is an important country, which has best practices of LTCC in terms of high production rates. ... Wang J, Yu B, Kang H, Wang G, Mao D, Liang Y, Jiang P (2015) Key technologies and equipment for a fully mechanized top-coal …
Here, the longwall, approx. 86 m long, is set up on the floor part of the seam, and coal left on top is drawn through the roof support chute on the gob shield onto the front AFC.The thickness of the seam is variable due to layer formation, but it is 8.5 m on average (Fig. 1).Of this 8.5, 3 m is mined from the longwall, the rest 5.5 m caves in.. The longwall …
DOI: 10.1080/15567036.2020.1841339 Corpus ID: 228845044; Feasibility study on fully mechanized large mining height long wall top-coal caving mining in ultra-thick (20–30 m), parting-rich coal seams: A case …
The 1200-2 fully mechanized top coal caving working face is located in the northeast of the first mining area, with an average mining height of 18 m, a working face length of 221 m, a minable ...
Proceedings of the 28th International Symposium on Mine Planning and Equipment Selection - MPES 2019. Numerical Investigation on Gate-Entry Stability of Trial Panel in Indonesia Longwall Coal Mine ... energies Article A New Gob-Side Entry Layout for Longwall Top Coal Caving Guorui Feng 1, Pengfei Wang 1, * 1 2 3 * ID and Yoginder …
Fully mechanized mining (FMM) technology has been applied in Chinese coal mines for more than 40 years. At present, the output of a FMM face has reached 10-million tons with Chinese-made …
Longwall top coal caving (LTCC) is a special type of longwall mining applicable to very thick seams (greater than 4.5m) where good quality coal is being left because …
In longwall top coal caving (LTCC) mining methods, problems such as large deformations, loss of coal resources, and excavation relay out of balance are often encountered with the increased production in single mining panels. To address these problems, a novel non‐pillar coal mining technology in LTCC was used based on the …
With the development of the technology and equipment of large mining height and fully mechanized top-coal caving, the organic combination of large mining height and fully mechanized top-coal caving has formed the unique mining method of 8–15 m coal seam mining, which has become an important technical approach to realize the …
Longwall top coal caving (LTCC) mining consists of two processes: shearer cutting in front of a hydraulic support and top coal caving behind a hydraulic support. …
1. Introduction. The longwall top coal caving (LTCC) is the main method to extract thick and extrathick coal seams. Figure 1 shows the basic procedure of LTCC. A longwall fully mechanized mining is arranged at the bottom coal seam, where the coal is cut by the shearer, with transporting out of the panel by the front scraper conveyor.
Drawing support is one of the unique equipment for longwall top coal caving (LTCC) technology in coal mine, whose structure has a significant effect on the top coal drawing mechanism. This research systemically investigates the effect of the dip angle of shield beam (α), length ratio of shield beam to tail beam (RL), and rotation angle of tail …
Top coal caving, under the conditions of a hard and thick coal seam, is recognized as a technical problem in coal production [48].The factors affecting the mining efficiency of top coal in fully ...
the rock-parting seam on the top coal caving ratio is also studied in this research. This continuous conver-sion mining technology can provide a viable solution for underground coal mines to continuously extract bifurcated coal seams and enrich the mining methods for thick coal seams with complex conditions (Kush-waha et al. 2016; Zhang et al ...
To explore a realistic top coal caving interval of the longwall top coal caving working face, longwall top coal caving panel 8202 in the Tongxin Coal Mine is used as an example, and 30 numerical ...
Underground mining of thick coal layers with a thickness of more than 4.5 m has operational, technical, safety and economic problems. When the mining height exceeds 5.0 m, it is difficult to optimize the productivity and control surface stability due to the limitation of equipment design and surface conditions (Hebblewhite et al. 2002, …
Top Coal Caving Technology and Equipment (Unique Identifier RFMEF160417X0173). References [1] Klishin S V, Klishin V I and Opruk G Y 2013 Journal of Mining Science 49 932 ...
