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一、前言 由无粘性土构成的边坡在工程中甚为常见,以往常视为均质情况,按表面滑动公式核算其静力及抗震稳定性。然而当这种边坡部分地浸没于水中时,水下部分处于饱和状态并受浮力作用,水上部分则处于非饱和甚至干燥的状态。土质虽然相同,但其所处的条件各异,成为非均质情况。再用表面滑动的公式显然不妥。文献[2、3]都曾提出过基于折线滑裂面设想的静力稳定分析法。关于按这一设想进行浸水边坡抗震稳定分析的问题尚未见有人提出。最近文献[4]虽提出按折线滑裂面计算临界加速度的方法核算无粘性边坡的抗震稳定性,但却未考虑边坡浸水的作用。
I. INTRODUCTION Slopes made of non- cohesive soils are very common in the project. In the past, they were often regarded as homogenous and their static and seismic stability were calculated according to the surface sliding formula. However, when such a slope is partially submerged in water, the underwater part is saturated and subjected to buoyancy, and the water part is in an unsaturated or even dry state. Although the soil quality is the same, its conditions vary and become heterogeneous. The formula for reusing surface slips is obviously inappropriate. In [2] and [3], the static stability analysis method based on the broken-line sliding surface was proposed. The issue of seismic stability analysis for soaked slopes according to this concept has not yet been proposed. Although the recent literature [4] proposed calculating the critical acceleration based on the broken-line sliding surface to calculate the seismic stability of the non-adhesive slope, it does not consider the effect of the immersed slope.