Abstract
This article introduces a new non-pillar coal mining technology (i.e., Gob-side Entry Retaining by Roof Cutting (GERRC)) under the condition of thick and hard roofs. First, we theoretically analyzed the solution to the large suspension span of the thick and hard roof in coal mining. Three-Zone pre-split blasting design in non-pillar coal mining for thick and hard roofs was proposed, based on the principles of rock mechanics. After field experiments, the technology was successfully applied to the non-pillar coal mining of a huge thick conglomerate roof. This research supplements the non-pillar mining technology system. The proposed technologies and methods have strong applicability and have certain guiding significance for the safe and efficient mining of related coal mines.
Highlights
Mining for Thick and HardGob-side Entry Retaining by Roof Cutting, a new non-pillar coal mining technology, is one of the latest and most widely used technology for Chinese coal mines [1–12]
Three deep holes are designed for Zone II blasting, which is perpendicular to the direction of the roadway
The properties of the thick and hard roof beams result in a large roof span, and the roof is not easy to collapse
Summary
Gob-side Entry Retaining by Roof Cutting, a new non-pillar coal mining technology, is one of the latest and most widely used technology for Chinese coal mines [1–12]. This technology greatly reduces the roof disaster problem and reduces hazards such as ventilation and gas accumulation This technology has significant safety benefits and social impacts [3]. There are basic research [13–16], laboratories [17–19], new inventions [20,21], and field engineering [22–25] around this new type of coal mining At present, this new non-pillar mining technology has been successfully applied to various geological conditions and different roof conditions. Thick and hard roofs are widely distributed in coal mines, which account for 1/3 of the proportion of coal mines in China These rock layers are generally thick-layered as a whole, and the bedding, joints, and cracks in the rock mass are not developed. The study of thick and hard roof control technology is of great significance for the promotion of non-pillar coal mining.
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