【摘要】 为研究地震力作用下黄土边坡的稳定性,根据地震角将地震力分解为水平地震力和竖向地震力。引入均方根加速度表征地震振幅大小,结合地震波加速度反应谱,分别计算出1/4持时、1/3持时及1/2持时的均方根加速度,并利用正弦函数曲线换算出水平和竖向地震力。建立黄土边坡失稳破坏模型,计算出不同持时及地震力偏角条件下的安全稳定系数。计算结果表明,考虑地震荷载特征的边坡安全稳定系数介于最小安全系数法和拟静力法计算结果之间,其中地震力偏角较持时对边坡稳定性的影响较大,以水平方向作为地震力作用方向,会对边坡稳定性产生过高的安全估计。更多还原

【Abstract】 In order to research the stability of loess slope under the effect of earthquake force,earthquake force is decomposed into horizontal and vertical forces according to earthquake angle.Combining with the acceleration response spectrum of earthquake wave,root mean square of acceleration under the conditions of 1 /4,1 /3 and 1 /2 duration are calculated,which are used to denote the amplitude of earthquake.The horizontal and vertical earthquake forces are obtained by using the curve of sinusoidal function.The sliding instability model of loess slope is built,and the safety and stability coefficients under the condition of different durations and angles of earthquake force are calculated.The calculation results show that(1) the safety and stability coefficients,which takes into account the characteristic of earthquake load,is greater than that obtained by method of minimum safety coefficient and less than that calculated by quasi-static method,the influence of drift angle of earthquake force is greater than the influence of duration on slope stability;(2) if we take horizontal direction as orientation of earthquake force,overestimation of safety will be produced on slope stability.更多还原