Fully mechanized coal mining face retracement end mining method

Abstract

The invention discloses a fully mechanized coal mining face retracement end mining method. The method comprises the following steps that a support is installed in a retracement channel; the working face bottom plate is adjusted to be 180 mm-220 mm higher than the retracement channel bottom plate; the support of anchor rods and anchor cables of the retracement channel is determined and then the retracement channel is supported by using the anchor rods and the anchor cables; and end-mining net-hanging coal mining is performed; and mining is stopped and the fully mechanized mining equipment is retraced. According to the method, end mining is conducted based on the supporting determination method of the top plate anchor rods, the top plate anchor cables and the side anchor rods, supporting reworking can be avoided on the basis that supporting design is completed in one step and end mining is ensured to be conducted 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

Images