地震作用下顺层岩质边坡动力可靠度分析

Dynamic reliability analysis of bedding rock slopes under earthquake actions

传统地震作用下顺层岩质边坡的可靠度分析往往是基于拟静力法,该方法没有考虑地震的动力特性,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力特性,建模求解会相对费时费力。本文综合考虑了地震的动力特性和强度参数随机性,提出了一种基于Monte-Carlo法的顺层岩质边坡动力可靠性分析方法。运用Matlab软件编写了地震作用下顺层岩质边坡动力可靠度的计算程序。同时提出一种累积可靠度的概念,采用整体累积平均可靠度去评价边坡的地震整体可靠度。计算对比分析表明,提出的地震作用下边坡可靠度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,与实际相比效果良好,且更偏于工程安全。

The reliability analysis of bedding rock slope under the action of traditional earthquake is usually based on the quasi-static method, which does not consider the dynamic characteristics of earthquake. However, although the seismic time history analysis method based on the numerical simulation software can consider the dynamic characteristics of earthquake, the modeling and solution will be relatively time-consuming and laborious. In this paper, considering the dynamic characteristics of earthquake and the randomness of strength parameters, a dynamic reliability analysis method of bedding rock slope based on Monte-Carlo method is proposed. The program for calculating the dynamic reliability of bedding rock slope under earthquake is compiled by using MATLAB software. At the same time, a concept of cumulative reliability is proposed to evaluate the overall seismic reliability of slope. The results show that the proposed method has high accuracy and efficiency. The reliability analysis method underestimates the seismic reliability of the slope, which is better than the actual effect and more inclined to the engineering safety.