Abstract: In this paper the upper bound theorem of plasticity theory is used, and the stability analysis under the earthquake force for the slope of the slide surface of logarithmic spiral in theory is proposed. In case the earthquake happens to be at seven, eight or nine degrees, the computation of stability factor for different slope angles with slope a equals to zero is given. On account of convenience in use, there are three charts made for the stability factor of earthquake.

摘要： 本文利用塑性理论上限解,从理论上对地震力作用下的对数螺旋线滑动面的土坡进行了稳定性分析。当地震为7°,8°或9°时,对坡度角α=0的不同边坡角作出了计算。为了便于应用,已做出三个稳定性系数图。