Study on optimization of internal dumpling of end wall for nearly horizontal open-pit coal mine with single coal seam

In order to alleviate the status quo of serious shortage in space of internal dumpling for Harwusu Open-Pit Coal Mine, while reducing the transport distan ce of production and stripping, the original internal dumpling plan of end wall was optimized, and it was proposed that firstly, the coal was mined out in eastern slotting z one of northern end wall, then bench combination was carried out to the direction of internal dumpling area when the coal of western bench combination had been mine d out for a certain distance, and the waste dumpling conditions were ready, and the waste dumpling began from western end of口1040 end wall, the coal mining and wa ste dumpling were carried out at the same time. The results showed that the scheme could avoid the transport distance of production and stripping too far, and the actu al distance was shortened for 1 347 meters at the same time, the waste dumpling of the end was also ahead of time, the shortage of internal dumpling space was reliev ed effectively, and the continuation of production was also ensured.