Webb12 juli 2024 · Comprehensive analysis of rock protective layer working face mining technology, mining conditions, and other factors such as mudstone is selected as the … Webb14 mars 2024 · Coalbed methane development is an important way to effectively utilize clean energy and reduce carbon dioxide and other gas emissions. However, due to the low permeability of coal seams, the development of coalbed methane in China has encountered great difficulties. Protective layer mining can efficiently minimize in situ stress and …
The pressure relief protection effect of different strip widths, dip ...
Webb9 juni 2024 · Protective coal layer (PCL) mining is a preferred regional method for preventing coal and gas outbursts; stress‐relief of PCL mining is the prerequisite of pressure‐relief gas drainage. In order to study the stress‐relief effect of PCL mining on protected coal seams and determine the protection scope of PCL mining under different … Webb16 aug. 2024 · Protective layer mining could not only significantly alter geostress but also increase the permeability of protected layer, which is beneficial for the coal gas extraction rate and ensures coal mining safety. However, due to unique geologic conditions, remote distance protective layer mining has its own characteristics. To investigate … child benefit form n ireland
Numerical Investigation of Safety Strategy for Gas Disaster
Webb11 apr. 2024 · Layer 2 Bitcoin refers to a secondary protocol or solution built on top of the Bitcoin blockchain that aims to improve the scalability, efficiency, and functionality of … Webb1 jan. 2024 · Mining a thin protective layer and using associated waste for gob backfilling is a systematic process, and there are a series of problems to be solved. For example, the mixture of coal and gangue after mining in thin coal seam cannot be … Webb1 jan. 2024 · Mining a thin protective layer and using associated waste for gob backfilling is a systematic process, and there are a series of problems to be solved. For example, … gothic platform boots