In addition, the layer separation exists in the end of span of overburden if the subsidence happens in whole overburden, which is resulted from the shear failure of the bedding plane.
另外，当覆岩发生整体下沉时离层主要存在于跨度两端，离层由层理剪切破坏引起。
The failure criterion can be judged by the rectangle region in the graph of the relation between ultimate out-of-plane load and ultimate in-plane shear.
它的破坏状态可以用极限面外荷载和极限面面内剪力关系图中围成的矩形区域来判断。
Shear strength of structural plane has an important influence on stability of engineering rock mass. It determines the probability of engineering rock mass failure.
结构面抗剪强度是影响工程岩体稳定的重要因素，它决定工程岩体破坏的可能性。
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