This paper describes a small laboratory test on flexural toppling failure of rock slope. This failure process involves slip between columns and tensile rupture across the colums. Gypsum columns with non-persistent cross joint were used to make a physical modeling for the slope failure mechanism.The slope model composed of the gypsum columns was set on a shaking table and was subjected to pulsating horizontal loadings for very short duration while the vertical loading was constant. The base failure plane observed has been initiated from the toe of the slope. The horizontal acceleration was monitored to estimate the inertial force generated in the slope.The form of the theoretical model proposed by Aydan & Kawamoto (1992), considering existing cross joint tips, was introduced to get a prior knowledge for the failure load. Through several cases of the test conditions, the effect of the apparent tensile strength of the column on the failure load is shown in this paper.It is found that the theoretical model provides the greater values of failure acceleration than the experimental results and overestimates the resistance of the slope against toppling failure for the loading process in this laboratory test.

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