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通过模拟忻州窑矿支承压力对大煤样的压裂实验，分析了顶煤的强度、变形特征，讨论了顶煤裂隙的６个演化过程，运用分形维数，给出了压裂与块度的线性规律，得出了顶煤压裂本构方程，为综放开采参数选择和数值分析提供了科学依据．
By simulating the fracturing experiment of large coal samples supported by supporting pressure in Xinzhou Mine, the strength and deformation characteristics of the top coal were analyzed. Six evolution processes of the top coal fractures were discussed. Fracture dimensions and fractal dimensions The constitutive equation of top coal fracturing is obtained, which provides a scientific basis for the parameter selection and numerical analysis of fully mechanized caving mining.