以自行研制的煤对氧扩散特性测试装置为实验手段，在常温环境条件下测试了不同粒度松散煤体对氧的自由扩散特性。
With special device manufactured by ourselves, the free diffusing characteristics of oxygen in different granularity coal are tested under normal temperature condition.
地层移动角参数对巨厚松散层矿井的建筑物保护煤柱尺寸影响很大，经济潜力十分巨大。
The displacement Angle of strata has a great bearing on the size of coal pillar for protection of buildings on very thick unconsolidated layers, and has a great economic potentials.
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