| Summary: | 碩士 === 朝陽科技大學 === 營建工程系 === 104 === Abstract
The rock slope is not usually a whole of rock. There are a variety of discontinuities exist in a rock slope. Multilayered rock slope is a common type of rock slope. It may be an interbedded of sandstone and shale rock or a multilayer slate rock. If the structure of rock slope is multilayered, its mechanical properties may be close anisotropic, so the numerical simulation of rock slope should use an anisotropic plastic model. In this study, a finite difference software, FLAC, was used to study the dynamic behaviors of multilayered rock slope under a harmonic load.
The Ubiquitous-Joint model will be used to simulate the anisotropic behavior of rock slope.The effect of influence parameters on the resonance frequency of the multilayered rock slope was analyzed. The influence parameters include the angle of joint, the thickness of rock slope and the depth of the water table in this study. The critical bedrock horizontal acceleration amplitude to make the multilayered rock slope failure was analyzed. The result shows that the angle of the joint is not a significant parameter on the resonant frequency of multilayered rock slope. When the thickness of the multilayered rock slope increases, the resonance frequency of rock slope reduces. When the elevation of water table reduces to the bottom of the rock slope, the resonant frequency will be close to that of the dry rock slope. The resonant frequency of rock slope decreases with decreasing water table elevation. The greater the angle of the joint is, the fewer the critical bedrock acceleration amplitude is, that is, collapse or slide of rock slope occurs more possibly. When the elevation of water table is higher, the critical bedrock acceleration amplitude is smaller.
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