Rapid Trenching Method of Deep One-shot Blasting for the Whole Segment of Small Block Section in Open-pit Mine with Large Water Influx Depression

Abstract

The invention relates to a rapid trenching method for the whole section of a small section of open-pit mine with a large water gushing volume, deep one-time blasting. According to the hydrogeological conditions of the mine site, the entrance and exit ditches are selected to be arranged in the area with a small water gushing volume, and the entrance and exit ditches are divided into five subdivisions. Sections, blasting and shoveling operations are carried out in small sections one by one to form normal trenching in the middle of the plot, advance blasting expansion around the surrounding area, and bottom blasting pile water collection layer. The completion of the sump can effectively reduce the impact of water inflow on the excavation of the new level of depression, reduce the ore transportation distance, release the next level of ore volume, and ensure the balance of the secondary ore volume in the stope. It has the advantages of being able to reduce the number of tedious pumping and drainage operations in the process of trench digging under the condition of large water inflow, and quickly complete the new stage of depression trenching. It is suitable for earthwork engineering applications, especially for mining, metallurgy and open-pit mining applications. .

Description

technical field [0001] The invention relates to a rapid trenching method for the whole section of a small section of a large water inflow depression open-pit mine, which is suitable for the application of earthwork engineering, especially for mining and metallurgy open-pit mining. 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 for the formation of the next new level, increasing the lower working space, and passing the new level. , 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 and reach and stabilize production, so as to maximize the economic benefits of the mine. The key to the timely preparation of the new level lies in the speed of trenching, which ...

AI Technical Summary

Problems solved by technology

Compared with trenching work and stripping work, although the production process is basically the same, the trenching work itself has different characteristics. Large, which restricts the efficiency of trenching. For mines with large water inflow, the pumping and drainage operation in the process of trenching is an important factor affecting the speed of trenching.

[0003] At present, as the depth of open-pit mining 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 new level of depression excavation at the lower part will inevitably be affected by the amount of water inflow. The wading depth of mining equipment Limited, generally no more than 1m. Therefore, for open-pit mines with large water inflows, the new level of excavation work efficiency will inevitably be 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 of the mine and a long duration , and even lead to the predicament that the upper steps rely on help and the lower preparations for the new level are not completed, which cannot guarantee the continuity of production capacity, which greatly affects the economic benefits of the mine

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