资料简介： Stability of Slopes
Introduction，Gravitational and seepage forces tend to cause instability in natural slopes, in slopes formed by excavation and in the slopes of embankments and earth dams. The most important types of slope failure are illustrated in Fig.9.1.In rotational slips the shape of the failure surface in section may be a circular arc or a non-circular curve．In general，circular slips are associated with homogeneous soil conditions and non-circular slips with non-homogeneous conditions．Translational and compound slips occur where the form of the failure surface is influenced by the presence of an adjacent stratum of significantlydifferent strength．
Translational slips tend to occur where the adjacent stratum is at a relatively shallow depth below the surface of the slope:the failure surface tends to be plane and roughly parallel to the slope.Compound slips usually occur where the adjacent stratum is at greater depth，the failure surface consisting of curved and plane sections．
边坡稳定
引言，重力和渗透力易引起天然边坡、开挖形成的边坡、堤防边坡和土坝的不稳定性。最重要的边坡破坏的类型如图9.1所示。在旋滑中，破坏面部分的形状可能是圆弧或非圆弧线。总的来说，匀质土为圆弧滑动破坏，而非匀质土为非圆弧滑动破坏。平面滑动和复合滑动发生在那些强度差异明显的相邻地层的交界面处。
平面滑动易发生在相邻地层处于边坡破坏面以下相对较浅深度的地方：破坏面多为平面，且与边坡大致平行。复合滑动通常发生在相邻地层处于深处的地段，破坏面由圆弧面和平面组成。
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