Effects and influences of water injection on coalbed exploitation in mining engineering

摘要

In order to investigate the effects and influences of water injection on coal bed exploitation and in basis of the impact of mechanics characteristics on coalbed through the process of water injection, some relevant laws applied in mining engineering could be indicated through out theoretical research and experimental study. There are several effects and influences from it, for example, desorption or outburst of gas is restrained so that the methane disasters could be decreased; meddle or hard top carving coal is soften leading to lower roof cases on coal mine; coal dust and rock burst are so also prevented and cured that better environment for exploitation. At last the detailed results showed that: percentage outburst of gas was depressed 56.4% after water injection; at 4 MPa high pressure water enclosed the coal samples contained gas, the desorption percentage was depressed about 80% towards the natural; the recovery ratio of top coal improved 9% after water injection; after 48 hour of water injection, the outburst of coal dust was depressed 20%; the rock burst reached the under degree after water injection. The results are contributed to exploit new technologies for traditional coal mines production.