An important step in designing engineering structures in rocky areas is evaluation the stability of rock slopes. Kinematic analysis as a purely geometric method is able to determine the possible modes of failure in jointed rock slopes. The required geological study is performed usually by utilizing walk over method as well as discontinuity surveys. This paper describes the stability assessment of a railway trench by analysis of the geological structure using stereographic projection technique. The studied trench is located at an entrance of a railway tunnel near Veresk in North of Iran. A scanline method was carried out to record the properties of discontinuities of the rock mass. Then after, daylight envelopes of stereographic projections were used to recognize the modes of failure for each major joint set in the rock exposure. A joint set was found in daylight envelope of toppling failure, while another joint set was defined to cause a planar failure. As a result, it was concluded that there are probabilities of both toppling, and planar failures along the trench face. Finally, some recommendations were advised in designing a supporting system with the help of observation and result of stereographic plot technique.
کلید واژگان :Slope stability analysis, Kinematic analysis, Railway trench, Rock slope, Stereographic projection.
ارزش ریالی : 600000 ریال
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