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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。
In order to study the stability of loess slope under earthquake force, the seismic force is decomposed into horizontal seismic force and vertical seismic force according to seismic angle. The root mean square acceleration is used to characterize the amplitude of the earthquake. Combined with the seismic acceleration response spectrum, the rms acceleration of 1/4, 1/3 and 1/2 hold time are respectively calculated and the sine curve is used to calculate the level And vertical seismic force. The failure model of loess slope is established, and the safety and stability coefficients under different holding and deflection angles are calculated. The calculation results show that the slope safety and stability factor considering the seismic load characteristics lies between the minimum safety factor method and the quasi-static method, in which the influence of the seismic force angle on the stability of the slope is larger than that on the slope stability, Direction as the direction of seismic force, will have a too high safety assessment of the stability of the slope.