Underground working face mining sequence optimization method for prolonging service time of surface land

Abstract

The invention discloses an underground working face mining sequence optimization method for prolonging service time of surface land and belongs to the field of mining technology, land utilization and land reclamation. The method comprises the steps of obtaining an insufficiently mined surface subsidence coefficient fitted curve of a location, determining a subsidence coefficient corrected parameter under a ground critical water accumulation condition, determining underground mining width Dc under the ground critical water accumulation condition, and optimizing an underground working face mining sequence according to the underground mining width Dc. The method optimizes the underground working face mining sequence by analyzing a surface subsidence movement rule of the location under the insufficient mining condition, so that the emergence time of the maximum surface subsidence value is changed, and the service time of the surface land is prolonged relatively. Finally, all underground coal can be mined, so that the coal recovery ratio is ensured, and the service time of the ground land, particularly cultivated land, is considered to a certain extent. The method is a green mining mode taking the land surface into account.

Description

technical field [0001] The invention belongs to the fields of mining technology, land utilization and land reclamation, and in particular relates to coal mining and land protection in high water level-plain mining areas. Utilizing the characteristics of surface movement under the condition of insufficient mining, through the optimization of the mining sequence of the underground working face, the time of maximum subsidence of the surface is delayed, thereby relatively prolonging the use time of the surface land. Background technique [0002] Coal is the most important energy source in China, accounting for about 70% of primary energy consumption. Since more than 90% of China's coal production comes from underground mining, and most of them are mined by the longwall full caving method, the land will inevitably sink, causing a large number of land subsidence and damage. According to calculations, the subsidence caused by underground mining of 10,000 tons of raw coal is as lit...

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Problems solved by technology

Since more than 90% of China's coal production comes from underground mining, and most of them are mined by the longwall full caving method, the land will inevitably sink, causing a large number of land subsidence and damage

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