Non-coal-pillar double tunneling method

Abstract

The invention discloses a non-coal-pillar double tunneling method. The non-coal-pillar double tunneling method includes that retaining a separating wall width tunneling tail roadway when performing working surface air return way and tail roadway tunneling, after delaying a tail roadway tunneling working surface, constructing a concrete pier and a concrete separating wall with a connected channel at the inner coal wall of the tunneled roadway, pre-embedding a gas discharge pipe, after the wall body intensity reaches the standard, using the wall body as one coal wall of the working surface air return way and tunneling, temporarily closing the front channel after forming the next connected channel, wherein the double tunneling ventilation effect is formed between the tail roadway and air return way through the connected channels. The non-chain-pillar double tunneling method uses the isolating wall as the protection coal pillar, the bad influence of a traditional roadway retaining method to the working surface recovery is radically solved, the one-time tunneling section of the roadway is small, the tunneling construction and roadway support are easy to perform, the cost is low, and the operation is safe and effective.

Description

Background technique [0001] Pillarless mining is an advanced underground mining method that rationally develops coal resources, improves roadway maintenance, reduces roadway excavation, is conducive to mine safety production and improves mine technical and economic effects. The implementation of coal pillar-free mining not only has practical significance for technical transformation of production mines, ease of mining relations and prolonging mine life, but also is one of the important ways for coal enterprises to improve safety conditions and technical and economic indicators, increase production, increase profits and reduce losses. As a coal pillar-free roadway protection technology, gobside entry retention is an effective way to reasonably develop existing coal resources and improve the recovery rate of coal resources. At present, there are many methods for roadway excavation along gob-side retaining and subsequent retaining, but many methods have some shortcomings. [000...

AI Technical Summary

Problems solved by technology

However, this method has the disadvantage of difficulty in ventilation in single-lane excavation

In addition, the roadway excavation before mining and the roadway retention after mining are independent of each other, and cannot be considered as a whole. It is likely that the roadway retention work in the later stage will fail to achieve the expected goal or even fail due to excessive deformation of the roadway in the later stage.

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