水平和竖向地震作用下顺层岩质边坡动力可靠性分析

发布时间：2018-03-25 22:50

本文选题：顺层岩质边坡　切入点：水平和竖向地震作用　出处：《土木工程学报》2017年10期

【摘要】：由于传统顺层岩质边坡地震可靠性分析往往是基于拟静力法,忽略了地震的动力特性,而基于数值模拟软件的地震时程分析法虽能考虑地震的动态性,却相对费时费力,该文同时考虑了地震的动力特性和强度参数随机性,提出顺层岩质边坡动力可靠性分析方法。运用Wilson-θ法和Matlab/Simulink工具建立了顺层岩质边坡地震响应简化计算方法。根据响应结果,运用Monte Carlo法计算了边坡的动力可靠度,并提出采用整体最小平均可靠度来评价边坡的地震整体可靠性。在此基础上,进一步分析了水平和竖向地震作用的叠加模式对顺层岩质边坡可靠性的影响。算例分析表明,提出的地震响应简化计算方法具有较高的计算精度和效率。该文可靠度分析方法低估了边坡的地震可靠性。与水平地震作用相比,竖向地震作用对顺层岩质边坡可靠性的影响也很明显。常用的水平和竖向地震作用的峰值叠加模式并不能充分地体现出双向地震的最大作用叠加效果,而采用双向地震的最大作用叠加模式更偏于工程安全。
[Abstract]:Because the traditional seismic reliability analysis of bedding rock slope is often based on pseudo-static method, the dynamic characteristics of earthquake are ignored. The seismic time-history analysis method based on numerical simulation software can consider the dynamic characteristics of earthquake, but it is relatively time-consuming and laborious. In this paper, considering the dynamic characteristics of earthquakes and randomness of strength parameters, a dynamic reliability analysis method of bedding rock slope is proposed. A simplified method for calculating seismic response of bedding rock slope is established by using Wilson- 胃 method and Matlab/Simulink tool. The dynamic reliability of slope is calculated by Monte Carlo method, and the global minimum mean reliability is proposed to evaluate the seismic reliability of slope. The effects of horizontal and vertical seismic superposition models on the reliability of bedding rock slopes are further analyzed. The simplified calculation method of seismic response has high accuracy and efficiency. The reliability analysis method underestimates the seismic reliability of slope. The effect of vertical earthquake on the reliability of bedding rock slope is also obvious. The commonly used peak stacking models of horizontal and vertical earthquakes can not fully reflect the maximum effect of bidirectional earthquakes. The maximum effect superposition mode of bidirectional earthquake is more inclined to engineering safety.
【作者单位】：华中科技大学;
【分类号】：TU457

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