潘三矿1662（1）工作面保护层范围考察方案优化及问题分析

针对潘三矿1662（1）保护层工作面角度达到20°以上、原考察的保护层有效保护范围已不适用、按照《防治煤与瓦斯突出规定》确定的理论保护范围与实际预计保护范围差别较大的问题，提出利用井下布置测试钻孔考察确定保护范围的方案。方案确定在预计保护范围内布置2组共14个钻孔、在原始煤体内布置2个钻孔，测试每个钻孔的瓦斯压力、含量、透气性、钻孔瓦斯流量等参数。考虑到测试钻孔较深影响测试结果，提出钻孔封孔要至见煤点，确保严密不漏气。

Optimization and problem analysis on investigation scheme of protective layer in 1662(1) working face of Pansan Mine

Aiming at the problems that the working face angle of 1662(1) protective layer in Pansan Mine is over 20 degrees，the effective protective scope of the original protective layer was no longer applicable，and the theoretical protective scope determined in accordance with the regulations for "Regulations on Prevention and Control of Coal and Gas Outburst" was quite different from the actual predicted protective scope.The protection scope scheme should be determined by the investigation of boreholes arranged underground was puts forward.The scheme determined that there were two groups of 14 boreholes in the predicted protection area and two boreholes in the original coal body.Each borehole tested gas pressure，content，permeability and gas flow rate of boreholes.Considering that the test boreholes have a deep influence on test results，it was proposed that the sealing of boreholes should be to the coal point to ensure tight gas leakage.