Support method for fully-mechanized coal mining face full-negative-pressure withdrawing channel

Abstract

The invention relates to the technical field of mining engineering, in particular to a support method for a withdrawing channel. The support method achieves full-negative-pressure ventilation during highly gassy mine fully mechanized coal mining face support withdrawing. After lasting mining of a fully mechanized coal mining face is ended, the self-excavation withdrawing channel is formed through coal cutting of a coal cutter, high-strength anchor rod (cable) support is performed on the withdrawing channel, the roadway retaining mode of driving nogs behind a sheltering frame is omitted, and one-off support is utilized for achieving full-negative-pressure ventilation during support withdrawing. According to the top plate structure of the withdrawing channel, the method of high-pre-stress anchor rod (cable) support is adopted for surrounding rock control. Anchor rods (cables) are adopted for supporting the withdrawing channel in a cantilever mode, nog construction in a traditional support withdrawing mode is basically eliminated, and support strength can meet the requirement for a ventilation section in full-negative-pressure support withdrawing. Through innovating the full-negative-pressure withdrawing channel support mode, the labor intensity is lowered to the maximum degree, the support withdrawing efficiency is improved to the maximum degree, and finally the safe, efficient and economical support withdrawing mode is achieved.

Description

technical field [0001] The invention relates to the technical field of mining engineering, in particular to a method for supporting a retraction passage that realizes full negative pressure ventilation during the withdrawal of a fully mechanized mining face in a high-gas mine. Background technique [0002] Shanxi Coal Group 15 # The coal roof is K with an average thickness of 10m 2 Limestone, this layer of rock is dense and hard, with very high integrity and strength. After the final mining of the fully mechanized mining face, the self-drilling retraction channel was formed by cutting coal with the shearer. During the withdrawal period, the following two ventilation methods were used: [0003] 1. Partial ventilation, using local fans to supply air to the frame, and the roof behind the protective frame will naturally collapse. With the horizontal extension of mining, the absolute amount of gas gushing out in local areas of mines increases, and the air supply mode of local ...

AI Technical Summary

Problems solved by technology

[0005] In the past, the retreat channel was mostly maintained by wooden piles. There were a series of problems such as high construction labor intensity, complicated process, and unreasonable support methods. Due to the compressibility of wooden piles, the anti-thrust ability was poor. If the top plate is under heavy pressure, it may cause the wooden pile to be pushed down and flattened, and in severe cases, the passage of the tail alley will be blocked, which cannot meet the requirements for ventilation in the later stage.

At the same time, the construction of dense wooden stacks in the retraction channel affects the normal unstacking operation, which cannot meet the requirements of safe and efficient unstacking

Images