Abstract

We have been conducting a series of centrifugal model tests in order to clarify the mechanisms of large-scaled bedrock collapses. Specifically, the behavior of cracks near the top or the bottom of bedrock was simulated in the centrifugal model tests and analyzed by means of limit equilibrium method, to investigate the influence of the locations of cracks on the back side of the bedrock on the stability of bedrock against collapse. The results of tests and analyses indicated that a bedrock slope is more stable and less likely to collapse when the cracks are close to the bottom of the bedrock. It was found in this study that deformation of the rock around cracks could greatly affect the stability of bedrock against collapse when the cracks develop close to the bottom of the bedrock.

To clarify the effect of rock deformation around cracks in the analysis, a series of centrifugal model tests were conducted by using materials with different elastic moduli for simulating cracked rock on the back side of the model bedrock. The analysis results showed that the stability of bedrock collapse increases with a decrease in the elastic modulus of the rock around cracks.

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