Abstract
Block theory regards rock mass structural face as a plane and cutting through whole rock-mass, i.e. joint trace length is infinite, but factually, it is finite revealed by engineering cases. This shows that block theory fails to give a full consideration to joint properties. In this paper, the author properly introduce joints random probability model into block theory to analyze key block slide probability. And make a comparison stability analysis by block theory and modified block theory in a case of rock mass slope. It is also testified that modified block theory is same effective with block theory, and more convenient for engineering application.
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