Method for recovering coal in easily sliding area of strip mine

Abstract

The invention discloses a method for recovering coal in an easily sliding area of strip mine, which is most suitable for recovering coal in a slope of the easily sliding area with a remarkable sliding surface. In a process of strip mining, the sliding surface is existent inside the slope of the easily sliding area; and when the coal in the easily sliding area are mined, the lower part of the sliding surface is located in the mining range. For preventing the exposed length of the sliding surface from being too long, the slope of the easily sliding area is divided into a plurality of mining strips for mining according to the trend, and the width of the mining strip is 2 times the working radius of a used electric shovel. The method comprises the steps of firstly mining the first mining strip, which is perpendicular to the trend of the slope or is pushed in the trend of the slope; timely following by an internal waste dump; after mining the previous mining strip, continuously mining the next mining strip; covering the exposed surface of the previous mining strip after reaching the boundary by the internal waste dump in sequence; and running in cycle until all the mining strips are mined. The method can be used for reducing the exposed length of the sliding surface of the easily sliding area, guaranteeing the slope to be stable, increasing the slope angle, recovering the coal and lowering the stripping ratio.

Description

technical field [0001] The invention relates to a coal recovery method in an open-pit mine, in particular to a method for recovering coal in a slippery area of ​​an open-pit mine, which is suitable for recovering residual coal in a slippery area, reducing the stripping ratio and improving efficiency. Background technique [0002] In the production operation of open-pit mines, due to the limitation of geological conditions and the influence of mining operations, many dangerous slippery areas have been formed. The slippery areas are pushed forward as a whole in a horizontal direction, and the inner dump site cannot follow up in time, resulting in a larger width of the pit bottom. , the exposed length of the slide-out end of the sliding surface will also increase, which will cause side landslides and endanger the safety of personnel and equipment. The cost of reinforcement in the slippery area is relatively high, and the effect is not obvious. The slope after reinforcement cann...

AI Technical Summary

Problems solved by technology

[0002] In the production operation of open-pit mines, due to the limitation of geological conditions and the influence of mining operations, many dangerous slippery areas have been formed. The slippery areas are pushed forward as a whole in a horizontal direction, and the inner dump site cannot follow up in time, resulting in a larger width of the pit bottom. , the exposed length of the slide-out end of the sliding surface will also increase, which will cause side landslides and endanger the safety of personnel and equipment

The cost of reinforcement in the slippery area is relatively high, and the effect is not obvious. The slope after reinforcement cannot continue to be mined, and the economic benefits are not obvious. A large amount of pressed coal under the slippery area has caused a serious waste of coal resources in the open-pit mine, and the stripping ratio is high. , the overall efficiency of the mining area is low

Images