软弱基座型斜坡变形破坏过程研究

在现场调查的基础上，以黄河上游某电站库区一个下部有软弱基座、上部为硬岩构成的双层结构型斜坡中发育的大型滑坡为例，通过地质分析及数值模拟分析，揭示了该类斜坡的形成多以软弱基座的压缩变形为先导，从而引起上部岩体拉裂、弯曲变形，并最终受坡体内最大剪应力带控制而形成蠕滑拉裂型滑坡的特征。

STUDY OF DEFORMATION AND FAILURE PROCESS OF SOFT FOUNDATION SLOPE

Based on the field investigation,the deformation mechanism of a large-scale soft foundation landslide is discussed in the area of hydroelectric power station in the upstream of Yellow River. The soft foundation slope is composed of soft rockmass in lower part and hard rockmass in upper part. It is demonstrated that the evolution of this kind of slide is always initiated by the compression of the lower soft rockmass,then the tension fracture and toppling of the upper hard rockmass occur,and at last the landslide of creep sliding-tensile fracturing type would occur along the shear stress concentration zone in the slope.