Abstract
Influence of Ground Stress on Coal Seam Gas Pressure and Gas Content
Highlights
Coal is the main energy in China, China’s production of raw coal is 35.2 million tons in 2011, and the proportion of coal in primary energy production structure is 78.6%
When porosity is reduced to 40% of the original, in coal seam I, only 0.19 m3/t free gas is converted into adsorbed gas, accounting for only 8.29% of the total gas content of coal seam; in coal seam II, only 0.23 m3/t free gas is converted into adsorbed gas, accounting for only 2.37% of the total gas content of the coal seam
When the coal seam porosity decreases to 40% of the original, for coal seam I, gas pressure increases from 0.45 Mpa to 0.50 Mpa, an increase of 11.1% (0.05 Mpa) compared to the original pressure
Summary
Coal is the main energy in China, China’s production of raw coal is 35.2 million tons in 2011, and the proportion of coal in primary energy production structure is 78.6%. In this way, local coal body stress is increased, which will compress coal (rock), making osmotic volume, porosity of the coal seam decreased, coal seam gas pressure and gas internal energy increased, providing conditions for coal and gas outburst [Han, Zhang, Song et al (2008)]. This paper will study on it through examples, which will help clarify the objective laws in coal-rock dynamic disasters and mean important theoretical significance for coal and gas outburst prevention
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