Abstract
The longwall coal mining method is the most productive mining method. However, the salvage operations which include the formation of the salvage chamber and the salvage of longwall face equipment require improvement. In 2011-2017, the time spent for salvage operations in SUEK-Kuzbass mines exceeded the standard time by more than 900 days. It has been established that the longwall face width from 230 to 300 m has no effect on the duration of salvage operations.
Highlights
The underground mines of JSC SUEK-Kuzbass use the longwall mining system for extraction of coal seams, which is the most productive mining system
Our experience has proven that the salvage of longwall face equipment is often associated with difficulties which result in an unexpected increase in the duration of this process, which entails a decrease in the economic performance of the mine
The modern longwall salvage technology includes the installation of flexible mesh to protect the longwall face area from falls of roof rocks
Summary
The underground mines of JSC SUEK-Kuzbass use the longwall mining system for extraction of coal seams, which is the most productive mining system. They use modern mining equipment, the length of a longwall panel can be as high as 2,500 m while the face can be up to 400 m wide, and the monthly production rate can be up to 500,000 tonnes. Our experience has proven that the salvage of longwall face equipment is often associated with difficulties which result in an unexpected increase in the duration of this process, which entails a decrease in the economic performance of the mine. The results of studies of underground stress conditions in longwall mines as well as the problems associated with salvage operations, are discussed in [1-7]
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