Abstract
Rock slopes left after surface mining in limestone quarry grow gradually larger and higher year after year. Recently, the stability evaluation of these large rock slopes has become an important engineering problem.Rock mass contains many discontinuous planes, such as joint, fault, etc, and the failure mode of rock slope is usually influenced by the geometrical conditions of the discontinuous planes.The block theory is the way to analyze three dimensional stability problems of discontinuous rock masses. In this theory, the critical block is named as the key block, and its character is defined by a topological concept. After the judgement of the key block, it is possible to determine the most suitable way to support these blocks.This paper describes the valid way of treating trace map including many discontinuous planes in order to find out the key block by vector calculation, and applies to stability evaluation of large rock slopes for three limestone quarries.
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