Run-through inner dumping method between mining areas for opencast coal mine during period of diversion

Abstract

The invention discloses a run-through inner dumping method between mining areas for an opencast coal mine during the period of diversion. The method comprises the following steps: a mining area I extends to the terminal, a trapezoidal mining empty trench is reserved in the overlapped range of the mining area I and a mining area II during the transition period that the mining area I is turned to the mining area II; the working pit edge of the mining area I extends forwards, while the length of the trapezoidal mining empty trench in the moving direction is increased gradually; a middle bridge I is put up on the trapezoidal mining empty trench and used for connecting an inner waste dump and the working pit edge of the mining area II; the inner waste dump extends forwards to one third of the length of the working pit edge of the mining area II, and then a middle bridge II is put up; when the inner waste dump extends forwards to two third of the length of the working pit edge of the mining area II, a middle bridge III is put up; after diversion is completed, the working pit edge of the mining area II extends forwards continuously, the mining area II extends downwards, the middle bridge I, the middle bridge II and the middle bridge III are alternately communicated in a stepped-forwards manner, so that the tasks of stripping and mining in the mining area II are completed. The run-through inner dumping method disclosed by the invention has the advantages that secondary stripping amount between adjacent strip-shaped areas is avoided or eliminated, the inner dumping transportation distance of the stripped materials is shortened, and the costs of transportation and stripping are reduced.

Description

technical field [0001] The invention relates to a method for connecting and internally draining the mining area during the turnaround of an open-pit coal mine, and belongs to the technical field of coal mining and quarrying. Background technique [0002] Large-scale open-pit coal mines with near-horizontal occurrence mostly adopt the basic mining technology of zoned mining and side-by-side rowing, combined with a comprehensive transportation method dominated by heavy-duty truck transportation. However, in the process of mining to the boundary in the previous mining area and turning to the next mining area, a large number of secondary stripping operations will be formed between adjacent strips, resulting in increased stripping costs. During the steering period, the layout of the ditch and pit lines is complicated, and the transportation of stripped objects needs to detour around the tortuous working line. The original double-loop transportation at the end and side is blocked ...

AI Technical Summary

Problems solved by technology

However, in the process of mining to the boundary in the previous mining area and turning to the next mining area, a large number of secondary stripping operations will be formed between adjacent strips, resulting in increased stripping costs

During the steering period, the layout of the ditch and pit lines is complicated, and the transportation of stripped objects needs to detour around the tortuous working line. The original double-loop transportation at the end and side is blocked by the steering operation channel, forming a single-loop transportation at the end, and the transportation distance of the stripped objects is greatly increased. cost also increases

like figure 1 Shown: In the open-pit mines mined by divisions, when the I mining area advances to the terminal and begins to transition to the II mining area, in order to reduce the secondary stripping amount between the two mining areas, the overlapping of the I mining area and the II mining area The trapezoidal gob ditch is reserved in the scope; the working side of the mining area I advances forward, and the length of the trapezoidal gob ditch continues to increase;

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