依据典型浅埋煤层工作面的实测和模拟，发现了采场老顶初次破断的非对称现象。
By field observation and simulating test of shallow seam longwall mining, the phenomenon of main roof asymmetry breaking is discovered during the first weighting.
研究结果表明，数值模拟准确反映了煤层瓦斯流动基本规律，能够定量预测煤层钻孔瓦斯流量。
The result shows that the numerical simulation has truly reflected the basic law of gas flow and can predict gas flow quantity from boreholes in coal seam.
介绍地层变化复杂，无明显对比标志地区如何利用模拟测井曲线进行岩、煤层综合对比。
How to use simulated logging curve makes a synthetical contrast of rock and coal seam at complicated stratum and no obvious mark area are introduced.
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