Based on simulating model test and theoretical analysis, the mechanism of main roof first breaking is revealed, and the asymmetry breaking parameter is determined.

运用相似模拟和理论分析相结合的方法，揭示了采场顶板初次破断机理，确定了有关参数。

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By field observation and simulating test of shallow seam longwall mining, the phenomenon of main roof asymmetry breaking is discovered during the first weighting.

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。

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