Anti-scouring method without coal pillars for wide excavation and narrowing of rockburst coal seam recovery roadway

Abstract

The present invention provides a coal-pillar-free anti-scour method for wide excavation and narrowing of coal seam recovery roadway under rockburst, which includes obtaining the original mining roadway width on both sides of the first mining face in the new mining area under the same mining layout form as the layout form, and The width of the original mining roadway is expanded by a preset multiple to obtain the planned width of the mining roadway. On both sides of the first mining face in the new mining area, a wide mining roadway with the width of the planned mining roadway is excavated, and a filling belt is constructed on the non-recovery side of the wide excavated mining roadway. On one side of the continuous working face adjacent to the first mining face, excavate the roadway with the width of the original mining roadway along the filling belt, and excavate the wide mining roadway on the other side and construct the filling belt on the non-recovery side of the wide mining roadway, and other follow-up work The roadway is excavated according to the roadway excavation method of the continuous working face. The embodiment of the present invention replaces the original coal pillars between the working faces with the filling belt constructed in the wide excavation mining roadway, which greatly reduces the accumulation degree of the static load of the foundation and improves the recovery rate of coal mine resources.

Description

technical field [0001] The invention relates to the technical field of coal mine safety mining, in particular to a coal pillar-free anti-scour method for wide excavation and narrowing of rockburst coal seam recovery roadways. Background technique [0002] With the increase of coal mining depth and mining intensity in my country, the intensity, frequency and area of ​​rock burst during coal mining are also increasing year by year. The section coal pillars set between the goafed working face and the working face to be recovered to isolate and support the roadway protection are the main factors that induce rock burst. According to statistics, about 70% of rock bursts in my country are related to section coal pillars. One side of section coal pillars is often the goaf, and the other side is the gob roadway of the working face to be recovered. Accidents frequently occur in gob roadways. The reason is that the coal pillars in the wide section bear the support pressure from the sid...

AI Technical Summary

Problems solved by technology

However, there are the following problems in the prevention and control of rock burst in the roadway at present: on the one hand, the effect of the plastic zone produced by the existing methods is not ideal, mainly manifested in the small range of pressure relief and rapid stress recovery; on the other hand, the pressure relief methods of the roadway have an impact on safe production , manifested in the damage to the partial support of the roadway caused by the pressure relief means, the personnel and equipment are in danger of impact during the pressure relief construction, and the pressure relief construction affects the normal operation of other processes, etc.

[0004] A better way to prevent rock burst is to leave a small coal pillar with a width of 4-6m to dig roadway along the goaf when preparing for the next working face. severely damaged

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