Dynamic Stability Analysis Of The Xishan Buddha Rock Slope Under Condition Of Earthquake

Along with the development of economy of the nation and augment of engineering projects, we will face bewilderment on slope stability analysis frequently. In railway engineering, highway engineering and irrigation works, it is a commonplace to be confronted with rock and soil slopes. Factually, slope stability analysis under condition of earthquake is one significant aspect of slope stability problem so that it needs careful and further consideration and is one of hotspot in geotechnical engineering and earthquake engineering. Considering the factors namely complicated constitutive equations of rock and indetermination of seismic load, it is specially perplexing and burdensome to analyze the problem. This thesis preliminarily discusses and analyzes distortion displacement and stability of the rock slope under condition of stochastic load in different earthquake intensity by combining the rehabilitation project of the Xishan Buddha rock slope in Taiyuan.The thesis has finished several tasks, as below:1. The thesis has reviewed several research method and evolvement of earthquake stability analysis of slope, including investigation method in hazard evaluation of slopes, dynamical characteristics research of rock and soil slope, application of quasi-static method, development and application of Newmark method and numerical modeling method. The thesis has summarized fundamentals of discrete element method and its realization in computer. Concretely, the thesis reviews several critical problems such as physical equation, kinematical equation and realization in computer and so on. Meanwhile, the thesis also introduces basic function of UDEC briefly.2. According to field work and mechanics experiment on rock sample, the thesis analyzes the safety factor of the rock slope after establishing the slope's physical analysis model. Based on the analysis results, it is indicated that rock mass in the slope is of well anti-slide capability along stratification. Even terrane attitudes incline to outside of the slope by 10°, the rock mass still has certain anti-slide capability. On the other side, fracture rock mass is sensitive to water that rock mass'anti-slide capability would be depressed when cranny in rock mass is of certain depth and drain condition is not so well. By anti-overturning analysis, rock mass on the slope would not topple from matrix.3. It is concluded that seismic intensity has an significant effect on stability of the Buddha rock slope by analysis based on discrete element method. Generally, the larger of seismic intensity is, on the premise of the same other conditions, the more severe destroy will happen. Augmenting seismic wave's frequency can increase horizontal and longitudinal displacements of the rock slope, however, if wave's frequency exceeds certain spectrum, the slope's final displacement is not so sensitive to enhancing save's frequency. Under the condition of earthquake, the slope's destroy starts from the Buddha's belly which is in weathered layer of the rock slope. In the freeing surface of the rock slope, rock in belly of the Buddha is extruded from matrix first. The second place where is easily destroyed is rock on the top of the Buddha incised by joints. Additionally, some rocks inside the slope and both flatforms before and after the slope freeing surface are easily destroyed for split.4. By contrasting analysis results obtained by quasi-static method and numerical modeling method, it makes clear that the results gotten by the former are inclined to more safe. The main reason for this is that analysis modeling by quasi-static method bases on mechanics function of two rock blocks. As matter of fact, there are many split rock blocks along vertical extend.