A Bottom Tunneling Method in Soft and Thick Coal Seam

Abstract

The invention discloses a method for excavating along the bottom of a soft and thick coal seam, which is suitable for soft and soft coal seams with a thickness of 5-7 meters, and comprises the following steps: S1 cuts the coal seam along the bottom, and leaves part of the coal seam at the top of the coal seam; S2 completes the cutting The cut roadway is supported by anchor mesh beams and anchor cables; S3 is sprayed for protection of the roadway; S4 is used for grouting reinforcement of the roadway. The cutting along the bottom in S1 specifically includes, cutting the coal seam horizontally and reciprocatingly along the bottom, reserving part of the coal seam along the top and the formation of the two side roadways, and finally vertically excavating the reserved along the top and Two gangs of partial coal seams. Form a roadway that conforms to the median line of the given roadway section. The technical scheme of the invention effectively solves the problems of soft and medium-thick coal seam roadway tunneling along the floor and top coal, soft coal seam, poor anti-disturbance ability and difficult control of surrounding rocks. The service life of the roadway is increased, the support reliability and engineering quality are improved, the repair rate is reduced, and safe production is effectively guaranteed.

Description

Technical field [0001] The present invention relates to a coal mine, and more particularly to a method of pine and thick coal seam. Background technique [0002] According to the coal seam, there is a large number of coal seams having a large amount of 5m-7m in China's coal resources. The coal seam is in the process of excavation. If the bottom is taken into the bottom along the bottom, the two lanes are too high, and the difficulty of the roadway is increased. It is not conducive to safety production; if the top plate, leaving coal is in progress, the work surface end treatment and advanced support, etc. are more complicated, which is not conducive to safety production; the roadway is along the bottom plate, the rodding coal mining Efficient restriation work is the most favorable arrangement, but because the coal seam is soft, the anti-disturbance capacity is poor, the surrounding rock is difficult to control, and it has always been one of the main problems of the industry. [0...

AI Technical Summary

Problems solved by technology

[0002] According to the characteristics of coal seam occurrence, there are a large number of coal seams with a thickness of 5m-7m in my country's coal resources. During the excavation process of this type of coal seam, if it is excavated along the top and bottom, the height of the two roadways will be too large, and the difficulty of roadway surrounding rock control will increase. , which is not conducive to safe production; if tunneling along the roof and the bottom coal is excavated, the mining links such as the end treatment of the working face and advanced support are more complicated, which is not conducive to safe production; the tunneling along the floor and the top coal is harmful to safety. High-efficiency mining is the most favorable layout method, but due to the soft coal seam, poor anti-disturbance ability and difficult control of surrounding rock, it has always been one of the main problems plaguing the production of the industry

[0003] "A Large Chamber Excavation Method (200910237883.7)" is not applicable and soft, joints and fissures are developed in coal seam roadway excavation, which is not conducive to the maintenance of the roadway surrounding rock, and there is no self-grouting reinforcement for the surrounding rock

However, "Excavation Method for Coal Seam Roadway with Hard Gangue (201710669048.5)" is not applicable to coal seam roadway excavation with soft and soft joints and cracks, and the excavation disturbance is relatively large, which is not conducive to the maintenance of the roadway surrounding rock, and there is no self-grouting for the surrounding rock Reinforcement measures are not conducive to safe production

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