Ditch excavation method for one-time blasting and layered shoveling of large-water-inflow sunken strip mine

Abstract

The invention relates to a ditch excavation method for one-time blasting and layered shoveling of a large-water-inflow sunken strip mine. The method comprises operations of ditch excavation, drillingand blasting, and shoveling. The method is characterized in that the ditch excavation operation comprises arrangement of entrance and exit ditches, section opening ditches, a short-term water collection pond and preliminary rib expansion; the drilling and blasting operation is divided into six sections for sectional drilling and blasting; and the shoveling operation comprises six times of separateshoveling, so that influences of a water inflow on new-level sunken excavation can be reduced effectively, excavation progress of the new level can be increased, the quantity of ore reserves on the lower part can be released in time, and reaching of the yield and stable production can be guaranteed. The method has the beneficial effects that influences of underground water inflowing on new-levelentrance and exit ditch excavation can be reduced; the excavation speed, efficiency of drilling and blasting, ditch excavation efficiency and shoveling efficiency of the new level can be increased; and sunken ditch excavation of a new stage can be completed quickly. The method is suitable for application in earth and stone engineering and especially applicable to mining-metallurgy strip mining.

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 ...

AI Technical Summary

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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