Strip mine trenching method

Abstract

The invention provides a strip mine trenching method. The method comprises the following steps: dividing steps of a strip mine into a higher slice and a lower slice; tunneling a higher slice main access and a higher slice pioneer cut to carry out a higher slice expanding operation; tunneling a lower slice main access and a lower slice pioneer cut to carry out a lower slice expanding operation, andcarrying out a higher slice stripping operation at the same time; carrying out the higher slice stripping operation and a lower slice stripping operation at the same time; and combining the higher slice with the lower slice to form a complete step main access and a step work line. Through the technical scheme of the method, the trenching operation is implemented in two stages, so that the trenching work account is reduced by 20-40% and the new level preparation time is decreased; in the new level preparation process, a work surface can be formed to implement the stripping operation, so that the convention of carrying out trenching, expanding and stripping in sequence is broken through, a multi-work surface operation can be formed as soon as possible at the initial stages of mines, the mines can reach design capacities as soon as possible, and the stable yield time of the mines can be prolonged to avoid reduction of output untimely.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a method for trenching in an open-pit mine. Background technique [0002] The new level preparation is the development preparation work that must be carried out for the depth extension and continuous and stable production of open-pit mines. It mainly includes the excavation and exit ditch, section ditch opening and the expansion project required for the next new level. Due to the limitation of the operating space, The equipment that can be arranged is limited. Compared with normal mining and stripping operations, the efficiency of equipment during trenching operations is reduced by about 30%. Trenching operations in open-pit mines have become a control project for new-level preparations. The key to the timely preparation of new levels lies in the excavation The trenching speed and the trenching speed largely determine the intensity of open-pit mining, and subsequently affect the p...

AI Technical Summary

Problems solved by technology

[0004] The existing trenching process has a large amount of work, and the new level strictly follows the sequence of trenching, side expansion, and stripping operations. In the initial stage of mine production, it takes a long time to form two-level ore volume, and it cannot quickly form multi-face operations, resulting in mine parts The equipment is idle, and it lasts a long time from commissioning to production; in the middle and late stages of mine production, the layered ore volume decreases, and the annual decline rate is limited, resulting in premature production reduction of the mine, which lasts for a long time, and even causes the upper steps to lean against the side and the lower part to be unprepared for a new level. The dilemma of completion cannot guarantee the continuity of production capacity, which greatly affects the economic benefits of the mine

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