Abstract
Fully mechanized top coal caving is a major high-yield and high-efficiency coal mining method for thick seam mining. At present, it is affected by the further popularization and application of fully mechanized caving mining because the recovery rate is limited. The research on the technology of fully mechanized top coal caving and transitional coal mining is crucial. This paper aims at the top coal recovery with the top coal of the fully mechanized caving face and the transitional frame at both ends of the working face. With the top roof structure model of the fully mechanized caving face, the numerical simulation and field measurement is used to compare the end coal caving. With caving coal or not, the destruction and migration rules of the top coal in the fully mechanized caving face are obtained. The study found that at the end of the transport trough, the maximum concentration factor of the support pressure in the coal is 2.35, and the maximum vertical displacement is 9.2cm. And at the end of the return air trough, the support pressure concentration factor is 3.53, and the maximum vertical displacement of the roof is 102cm. The above research reveals the law of the occurrence of the pressure and the movement of the top coal when caving the coal at the end, while ensuring the safe production and efficient mining of the coal mine.
Highlights
Coal resources account for more than 55% of China's primary energy consumption
China has proven coal reserves of 900 billion tons, of which coal reserves in thick coal seams account for 44.1% and 45.6% of total coal production [4,5]
There is a macro stress shell composed of high stress bundles in the surrounding rock of the fully mechanized top coal caving face, which is closely related to the thickness of the coal seam at one time
Summary
Coal resources account for more than 55% of China's primary energy consumption. Coal supports the rapid development of China's economy. Mechanized mining has the advantages of high production efficiency, low energy and material consumption, low roadway excavation rate, low production cost, and strong adaptability to geological conditions It gradually replaces layered comprehensive mining as the main technology for top coal mining. There is a macro stress shell composed of high stress bundles in the surrounding rock of the fully mechanized top coal caving face, which is closely related to the thickness of the coal seam at one time. There are still some problems that need to be solved urgently in the mining of top coal, such as insufficient theoretical research on the pressure at the end of the fully mechanized caving face, and the relatively low recovery rate of the fully mechanized caving face. To further improve the resource recovery rate of the fully mechanized top coal caving face, it is of great significance to research and develop an efficient end-to-end coal caving support for in-situ coal mines, to study in-depth coal caving technology at the fully mechanized caving face, and to recover the top coal at the end
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