含泥化夹层的岩质边坡抗震稳定性研究

发布时间：2018-08-19 18:53

【摘要】：本论文主要对滇西南地区含有软弱夹层的岩质高边坡在地震荷载下的稳定性进行了研究,主要应用了极限分析上限法和模型试验法对含夹层的岩质边坡的在地震荷载下的稳定性进行分析,综合运用了波动理论分析透射正弦波在滑体中的做功功率,运用了单因素敏感性分析法对影响坡体稳定性的因素进行了探究,考虑了由降雨而导致边坡趋于不稳定的因素,最后又结合室内振动台模型试验对模型破坏的过程、形态和机理进行研究,并以加速度传感器测得的数据为基础进行计算,验证极限分析上限法的应用的合理性。研究的主要内容如下:(1)应用上限法对含夹层的边坡沿夹层滑动破坏进行分析,基于能量系数判断其稳定性,又应用波动理论知识求正弦波透射过夹层对滑体做功的功率,通过对能量系数的时程分析提出以最小平均能量系数作为稳定性判据判断边坡的稳定性。(2)论文对夹层倾角、地震波入射角、夹层土体粘聚力、夹层土体内摩擦角和地震波加速度幅值五个参数的敏感性进行了分析,得出各参数对边坡稳定性的影响程度,同时还分析了降雨对含夹层岩质边坡抗震稳定性的影响,研究了考虑夹层饱和度时的边坡的能量系数的求解方法,并应用于一个实际工况的边坡,求夹层在三种不同饱和度下最小平均能量系数,得出含水量对稳定性的影响趋势。(3)设计并制作了室内模型试验,以相似关系选取模型材料,每个模型铺设了四层倾角为15°厚度为2cm的黏土层用以模拟软弱夹层。研究了当地震荷载等级逐渐增加的时候模型边坡的破坏过程和最终的破坏形态,并选取了两个工况下加速度传感器测得数据通过拟合等处理后用于计算第三个夹层处的最小平均能量系数,与实际的破坏形态进行比较,最后通过对加速度传感器测得的数据进行滤波积分等处理得到各测点处的位移时程,并以此探讨模型破坏机理。
[Abstract]:In this paper, the stability of rock slope with weak intercalation in southwest Yunnan under earthquake load is studied. The limit analysis upper limit method and model test method are used to analyze the stability of rock slope with intercalation under seismic load. The wave theory is used to analyze the work power of transmitted sine wave in sliding body. The single factor sensitivity analysis method is used to explore the factors that affect the stability of slope body, and the factors that lead to slope instability due to rainfall are considered. Finally, the failure process of the model is combined with the model test of indoor shaking table. The morphology and mechanism are studied and calculated on the basis of the data measured by acceleration sensor to verify the rationality of the application of the upper limit method of limit analysis. The main contents of the study are as follows: (1) the upper bound method is applied to analyze the sliding failure of the slope with intercalation. The stability of the slope is judged based on the energy coefficient, and the power of sinusoidal wave transmission through the interlayer to work on the sliding body is calculated by using the theory of wave theory. Through the time-history analysis of the energy coefficient, the minimum average energy coefficient is proposed as the criterion of stability of the slope. (2) the intercalation inclination angle, the incidence angle of seismic wave, the cohesive force of intercalated soil are discussed in this paper. The sensitivity of five parameters, the angle of internal friction and the amplitude of seismic wave acceleration, are analyzed, and the influence of each parameter on slope stability is obtained. At the same time, the influence of rainfall on seismic stability of intercalated rock slope is also analyzed. The method of calculating the energy coefficient of a slope considering interlayer saturation is studied. The method is applied to a slope under actual working conditions and the minimum mean energy coefficient of intercalation is obtained under three different saturation conditions. The influence trend of water content on stability is obtained. (3) the indoor model test is designed and made. The model materials are selected according to the similarity relation. Each model is paved with four layers of clay layer with a dip angle of 15 掳thickness of 2cm to simulate the weak intercalation. The failure process and ultimate failure pattern of the model slope are studied when the seismic load level increases gradually. The minimum average energy coefficient of the third interlayer is calculated by fitting the measured data of the acceleration sensor under two working conditions, and the results are compared with the actual failure pattern. Finally, the displacement time history of each measuring point is obtained by processing the data measured by acceleration sensor, such as filter integral, and the failure mechanism of the model is discussed.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU457

【参考文献】