Top coal caving mining technology started in the 1980s and continues to this day 1,2. Longwall top coal caving (LTCC) mining consists of two processes: shearer cutting in front of a hydraulic ...
To improve the coal recovery rate and reduce the excavation of the mining roadway, the 111 mining method of longwall mining is proposed in the Soviet Union based on the 121 mining method.
Traditionally, longwall top coal caving (LTCC) panels adopt the single‐window drawing mode and their drawing efficiency is relatively low. The synchronous multi‐window drawing (SMWD) mode is a remarkable approach to resolve the incompatibility between shearer coal mining and top‐coal drawing. The present paper analyzes the …
The improvement of mining equipment in recent years has greatly increased the application of longwall top coal caving technology [Wang JC et al. 2004; 2014].This mining method not only improves the production and efficiency but also reduces the spontaneous combustion disaster in longwall operations [Unver and Yasitli (); Khanal et …
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 …
1. Introduction. According to the studies conducted by Sun Chuang (Sun et al. 2021) and other scholars on regarding the work face, main features are large inclination angles and mining heights, compound roofs, the high tendency to separation and collapse, loose coal body, often severe rib spalling and roof collapse tending to occur in the middle …
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 ...
Ediz IG et al. application of retreating and caving longwall (top coal caving) method for coal production at GLE Turkey. Mining Technology. 2013; 115 (2):41-48; 25. Liu H et al. Comprehensive study …
Based on the engineering background of gob-side entry retaining in fully-mechanized longwall with top coal caving (GER-FLTC) on N2105 working face of Yuwu coal mine, by adopting the methods of ...
Abstract The first caving of top coal and the first weighting of roof strata in Longwall Top Coal Caving (LTCC) mining were analyzed in a parametric study by using a discontinuum modeling ... "Cavability assessment in longwall top coal caving technology." Ph.D. thesis, School of Mining Engineering, Univ. of New South Wales. …
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WebTop coal boundary. Top coal recovery. Top coal is difficult to break and then flow out of the support opening at the end area of longwall top coal caving (LTCC) …
Mining-induced subsidence is a great concern for environmental protection in underground mining areas in China and all over the world. In view of the fact that the research on land degradation above underground coal mines are completely or partially independent of coal mining activity and the fact that the mechanism behind mining …
Dynamic sublevel caving technology (DSCT) proposed by the researchers is one of effective methods to solve the problems of low top coal recovery, poor drawing balance and support stability in longwall top coal caving (LTCC) with large dip angle. To investigate the reasonable number of supports in a sublevel (N) and the top coal drawing …
The re-mined face using top coal caving system is the most applicable method for recovering the remaining reserves of a previous partially-mined thick coal seam. However, this mining method may encounter the problems of low recovery and unpredicted geological conditions. A numerical model is developed using PFC2D for studying the …
the extraction of coal from underground mining is a clean coal technology, the production from opencast mining andis dominating underground mining for 5 decades, aroundand is being ... 1.9 It is pertinent to note that the longwall top coal caving (LTCC) is the method which is extensively deployed for extracting thick and extra-thick coal seams ...
The optimization of top coal caving technology is an efficient method to improve the recovery ratio in longwall top coal caving (LTCC). In extrathick coal seams, the conventional single-opening sequential caving technology (SOSCT) shows the following problems: low recovery ratio, high rock mixed ratio, and poor drawing balance. …
9.1 Introduction. Since the early 1980s, longwall mining has developed into the safest, highest producing and most productive form of underground coal mining, rivalling the performance of many surface mining operations. In Australia, for example, advances in technology, geotechnical engineering and work practices over that period …
Longwall top coal caving (LTCC) technology is one of the effective methods for extracting thick and extra-thick coal seams. Since it is introduced into China in 1982, LTCC has gained a lot of achievements and experience not only in caving technology and equipment but also in the drawing theory after 40 years of development, …
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.
Abstract. The paper discusses advanced top coal caving technologies for thick coal seams and addresses some issues of incomplete coal extraction, which can …
The characteristics of full-mechanized top coal caving for extra thick seam coal were presented. The automation of top-caving hydraulic support and relevant equipment have achieved important breakthrough. At the end of this paper, further development of China's coal industry and longwall mining technologies and equipment …
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 …
As shown in Fig. 1, longwall top coal caving (LTCC) is a main and widely used technology to extract thick and extra-thick coal seams.Its basic procedural is that the bottom coal seam is mined by the conventional longwall mining; the top coal is broken into loose blocks under the mining-induced stress and other factors, and then drawn out …
Taking into consideration the mining hazards like gas, fire and inundation, a feasible mining methodology for the coal pillar extraction is still its infancy. In this paper, a methodology is applied for the extraction of coal seam having 3 m …
In the process of longwall top coal caving, the deformation and movement of the overlying hugely-thick conglomerate stratum (HTCS) directly affects the rock pressure behavior in the longwall. Based on conditions of the geology and mining of coal face 13,180 at Gengcun coal mine of Yima Mining Area, China, numerical and similar material …
1 Introduction. 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 ). …
A coal burst mitigation strategy for tailgate in mining of deep inclined longwall panels with top coal caving at Huafeng Coal Mine is presented in this paper. Field data showed that coal bursts, rib sloughing or slabbing, large convergence, and so forth frequently occurred within the tailgate entries during development and panel retreating employing …
Panel 42105 of the longwall top coal caving (LTCC) operation is one of the panels in the 4–2 coal seam. It is extracted with the mechanized longwall retreat method. The mining height ranges from 5.9 to 7.3 m, with an average of 6.7 m, cutting height of 3.7 m, and caving height of 3 m. ... China University of Mining and Technology Press ...
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 ...
Longwall top coal caving mining is one of the main methods of mining thick coal seams in China. Therefore, carrying out the classification evaluation of top coal caving is of great significance to ensure mining success and reduce the risk of mining technology. In order to realize the classification evaluation of top coal caving, this …
Longwall top coal caving (LTCC) is a relatively new method of mining thick coal seams that is currently achieving high productivity and efficiency in application, particularly in China. The technique is similar to traditional longwall mining in that a cutting head slices coal from the lower section of the coal seam onto a conveyor belt installed in …
Longwall top coal caving (LTCC) mining is the most ... mining technology will constitute the development direction and target for extra‐thick coal seam extrac-tion.41 Indeed, ...
Longwall Mining Technologies. As coal mining technology and equipment are improved in China to meet the growing demand for coal, high-intensity longwall mining is becoming increasingly common. The main mining methods are fully mechanized full seam mining or fully mechanized top-coal caving (Guo et al. 2019).
Since the last plow longwall mine was closed in 2018, the chapter on plow longwalling has been dropped and in its place Automation of Longwall Components and System is added. Also, a new chapter Longwall Top Coal Caving Mining (LTCC) is added due to its successful application in Australia since 2005.
