Method for exploiting open pit coal mine near slope in seasonal frozen soil area

Abstract

The invention discloses a method for exploiting an open pit coal mine near slope in a seasonal frozen soil area. The method for exploiting the open pit coal mine near slope in the seasonal frozen soil area comprises the following steps of calculating the stability of a coal end slope before exploiting, specifically, when the stability coefficient of the coal end slope before exploiting is larger than a preset coefficient, the flat plate width of a coal step on the lower part of the end slope is changed through simulation in a slope mechanical model combining the frozen soil area and frozen soil mechanical properties, so that the flat plate width when the stability coefficient is the preset coefficient is obtained, and the flat plate width of the coal step on the lower part of the excavated end slope is equal to the flat plate width obtained through simulation when the coal step is excavated; and improving the stability of the end slope in time through inner discharge of slope pressing before the end of the slope freezing period. According to the method for exploiting the open pit coal mine near slope in the seasonal frozen soil area, safe and efficient recovery of coal resources can be achieved.

Description

technical field [0001] The invention relates to an open-pit coal mining method, in particular to a side mining method in an open-pit coal mine in a seasonal frozen soil area. Background technique [0002] As my country's coal resource mining focus gradually shifts to the central and western regions, the coal seams in the central and western regions are shallower and thicker, suitable for open-pit mining. The proportion of coal production in open-pit mining has increased year by year, and it has exceeded 50% in Xinjiang . Under the condition of thick coal seam, the amount of coal pressed under the side of the stope in the open-pit mine is huge, resulting in an extreme waste of coal resources. In the current traditional mining design, all are static slope stability, starting from the physical and mechanical parameters of slope rock mass, without considering the influence of external factors such as temperature and water on slope stability. However, under the high-cold climate...

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Problems solved by technology

Under the condition of thick coal seam, the amount of coal pressed under the side of the stope in the open-pit mine is huge, resulting in an extreme waste of coal resources

In the current traditional mining design, all are static slope stability, starting from the physical and mechanical parameters of slope rock mass, without considering the influence of external factors such as temperature and water on slope stability

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