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通过沿滑面的应力积分法和动力时程分析法,研究了水平向、竖向地震动单独作用对边坡动安全系数的影响,发现竖向地震动与水平向地震动一样也对边坡抗震稳定性有显著的影响。在此基础之上,重点探讨了实际地震的双向地震动同时作用时,其时间遇合模式对动力安全系数的影响,结果表明,常用的加速度峰值遇合模式和随机遇合模式都不能充分体现出竖向地震动与水平向地震动的叠加效应,进而造成对安全系数的高估;文中提出的最大地震作用效应遇合模式才是最危险的遇合模式,其所得稳定性安全系数时程的极值更小。在考虑多向地震的边坡抗震分析中,由于多维地震动的强烈随机性,应考虑出现这种最大地震作用效应遇合的可能性,以得到工程设计中偏于安全的动力稳定性安全系数值。
Through the stress integration method along the sliding surface and the dynamic time history analysis method, the influence of the horizontal and vertical seismic actions on the safety factor of the slope is studied. It is found that the vertical ground motion also affects the slope as well as the horizontal ground motion Seismic stability has a significant impact. On this basis, the paper mainly discusses the influence of time-bound mode on dynamic safety factor when two-direction ground motions of real earthquakes are acting at the same time. The results show that the commonly used accelerating peak and random modes can not fully reflect the vertical The superposition effect of ground motion and horizontal ground motion leads to an overestimation of safety factor. The maximum earthquake action effect presented in this paper is the most dangerous case of combined mode, and the extremum of the resulting stability safety factor is smaller . Considering the strong randomness of multidimensional ground motion in the slope aseismic analysis considering multi-direction earthquakes, the possibility of such maximum earthquake effect should be taken into account to obtain the safety-critical safety factor of safety in engineering design .