Trenching method of one-time blasting and layered shoveling in open-pit mines with large water inflow sags

Abstract

The invention relates to a trenching method for one-stage blasting and shoveling in a sunken open-pit mine with a large amount of water gushing, which includes trenching, blasting and shoveling operations, and is characterized in that the trenching operation includes arranging entry and exit trenches, section trenches, short-term collection The pool and the initial expansion; the blasting operation is divided into six sections and the blasting operation is segmented; the shoveling operation includes six shoveling operations, which can effectively reduce the impact of water inflow on the excavation of the new level of depression, improve the excavation progress of the new level, and release in time The lower ore volume ensures the mine's full and stable production. It has the advantages of reducing the impact of underground water gushing on the excavation of the new level of entry and exit ditch, improving the new level of excavation speed, penetration efficiency, trenching efficiency and shoveling efficiency, and quickly completing the new stage of depression ditching. It is suitable for earth and rock engineering applications , especially suitable for mining and metallurgy surface mining applications.

Description

technical field [0001] The invention relates to a ditching method for one-time blasting and layered shoveling in a sunken open-pit mine with a large water inflow, which is suitable for earthwork engineering applications, especially for mining and metallurgy open-pit mining applications. Background technique [0002] The new level preparation of the open-pit mine mainly refers to digging in and out of the ditch from the level (steps), opening a section to reach the next level, and carrying out side expansion operations before the formation of the next new level, increasing the lower working space, and passing the new level of excavation. , release the ore volume in the lower part of the stope, ensure the balance of the secondary ore volume in the stope, and at the same time ensure the operation rate of mechanical equipment, ensure the mine's stable production, and maximize the economic benefits of the mine. In order to ensure a new level of rapid excavation, the width of the ...

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Problems solved by technology

[0003] As the mining depth of the open-pit mine continues to deepen, it enters the mode of depression mining or even deep depression mining. After the new level reaches the static water level elevation of the open-pit mine, the depression work at the new level of the lower part will inevitably be greatly affected by the amount of water inflow. The wading of mining equipment The depth is limited, generally no more than 1m. Therefore, for open-pit mines with a large amount of water inflow, the benefit of the new level of excavation work will be further reduced. In severe cases, some equipment in the mine may even be idle, and the annual decline rate is limited, resulting in premature production reduction in the mine. It lasts for a long time, and even leads to the predicament that the upper step is leaning against the help and the lower part is not ready for the new level. It cannot guarantee the continuity of production capacity, which greatly affects the economic benefits of the mine.

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