| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 105 === Rock slope subjected to weathering and changes in groundwater levels will make the material gradually weakened, resulting in rock slope creeping, folding or progressive damage. The displacement of a rock slope does not necessarily mean that it reaches the condition of collapse. Events of typhoon and heavy rainfall will cause displacement, the phenomena may continue for more than a few years or even decades. Using the UDEC numerical analysis software, the strength reduction method, the gravity increase method and the groundwater level elevation method are used to study the effects of weak planes and spacing on slope behavior.
In this study, we use equilibrium ratio and the number of calculation steps to define the failure condition. The cumulative displacements before collapse are compared for slopes with the same safety factor but different orientations and spacing of weak planes. The simulated deformation is consistent with the deformation behavior in literature.
The results show that cataclinal slopes yield more displacement than cataclinal slope do. Moreover the more vertical the weak planes are, the more cumulative displacement obtained.
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