边坡地震稳定性的临界加速度分析

提出了两种不同意义的边坡地震稳定性概念。一是按一定的抗震设防目标地震作用考虑,边坡现状强度与临界强度相比较而言的储备强度稳定性;二是设防目标地震作用与现状边坡临界地震作用相比较而言的现状强度稳定性。第一种边坡地震稳定性概念已经得到普遍采用,分析方法也比较成熟;第二种边坡地震稳定性概念受到的关注较少,衡量标准和分析方法尚有待探讨。主要针对第二种边坡地震稳定性——现状强度稳定性的衡量标准和分析方法进行了研究,提出了边坡现状强度地震稳定性评判的临界加速度准则,结合山西晋阳大佛边坡地震稳定性分析,形成了拟静力法与动力时程法相结合的边坡现状强度地震稳定性分析方法,拓展了边坡地震稳定性的概念,为边坡动力稳定性分析提供了一条新思路。

Critical Acceleration Analysis of Earthquake Stability of Slopes

Two concepts of earthquake stability of slopes with different meanings are put foreword in this paper: reserved strength slope earthquake stability displayed with the different strength between its present strength and its critical strength of a slope under a fortification earthquake action; and present strength slope earthquake stability revealed by comparison between the fortification earthquake action and the critical earthquake action of the slope. The first concept has already been widely adopted, and its analysis method is well developed too; the second concept, however, is rarely mentioned, and its criterion and analysis method has yet to be set up. The second earthquake stability of slopes, including its criterion and analysis method, is studied in this paper. A critical acceleration criterion to judge the present strength earthquake stability of slopes is set up, and a synthetic analysis method of pseudo-static and dynamic time series analysis for present strength earthquake stability of slopes is formed and applied in the analysis of earthquake stability of Jinyang Grand Buddha slope in Taiyuan, China.