A method of withdrawal and final mining in fully mechanized mining face

Abstract

The invention discloses a retraction end-mining method of a fully mechanized mining face, which comprises the following steps: installing a bracket in the retraction channel; adjusting the bottom plate of the working face to be 180 mm to 220 mm higher than the bottom plate of the retraction channel; determining the anchor rod and anchor cable of the retraction channel support, and then use anchor rods and anchor cables to support the withdrawal channel; carry out coal mining at the end of mining; stop mining and withdraw fully-mechanized mining equipment. The method of the present invention is based on the support determination method of roof bolts, roof anchor cables and side bolts to carry out final mining. On the basis of completing the support design at one time, support rework can be avoided, and final mining can be ensured to proceed smoothly.

Description

technical field [0001] The invention belongs to the technical field of mine mining, and in particular relates to a retraction and final mining method of a fully mechanized mining face. Background technique [0002] The retreat of the fully mechanized mining face directly affects the production efficiency of coal mines. Safety, efficiency and economy are three important indicators. The stability of the surrounding rock of the withdrawal channel is the premise to ensure the safety and rapid withdrawal of the equipment, which is directly related to the production efficiency and economic benefits of the coal mine. Coal mining enterprises and industry experts attach great importance to such issues. Under the influence of excavation and mining, the nature of the surrounding rock of the retracted roadway will change. Therefore, when designing the support of the retracted roadway, the structure of the coal seam roof and its movement law in the mining area should be fully considered,...

AI Technical Summary

Problems solved by technology

[0003] According to the location of the retraction roadway, the condition of the underground rock stratum, and the development of rock formation fissures, the current support design of the retraction roadway faces two difficulties: first, during the advancement of the working face, the pre-excavation of the retraction roadway The changing law of the stress on the surrounding rock is relatively complicated, and the deformation of the surrounding rock is large;

[0004] Poor support form will cause the bracket to be crushed to death, which will bring danger to the moving work and reduce production efficiency. However, an overly conservative support form will also bring inconvenience to the move and reduce production efficiency

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