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根据大同坚硬顶板的块体特征，运用赤平投影判别法对三类端面块体的有限性、可动性进行了分析；运用矢量分析方法结合结构面的力学特性，对端面块体的稳定性及运动形式进行了研究，并提出了三类端面块体的平衡、失稳判据．
According to the block characteristics of Datong’s hard roof, the finite and mobility of the three types of end-face blocks are analyzed by the method of stereoprojection projection. The stability of the end-block and its stability are analyzed by vector analysis method combined with the mechanical properties of the structural plane. The form of motion is studied, and the criterion of equilibrium and instability of three kinds of end-face blocks is proposed.