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鉴于目前倾倒-滑动组合型滑坡的变形特征及形成机理研究尚少,以云南省澜沧江上游两处典型的大型倾倒-滑动组合型滑坡(争岗滑坡、根达坎滑坡)为例,通过现场工程地质调查,分析了该类滑坡发生倾倒变形破坏的基本特征,并利用离散元模型对其形成机理进行数值模拟。结果表明,该类倾倒变形主要发育在临空条件较好、软硬岩体相间、较广范围硬岩、岩体倾角大于75°的边坡中;岩体依次经历弯曲、倾倒、折断、坠覆,从而形成倾倒体;硬岩内受剪切作用发育多条顺坡向软弱层带;折断面相继贯通,且超过其抗剪强度,坡体沿倾倒折断面及软弱层带发生滑动破坏,进而形成滑坡。
In view of the current research on the deformation characteristics and formation mechanism of the dumping-sliding composite landslide, the two typical large-scale dumping-sliding composite landslides (Zhenggang Landslide and Root Danka Landslide) on the upper reaches of the Lancang River in Yunnan Province are taken as examples. Geological survey, analyzed the basic features of the landslide collapse and failure occurred, and the use of discrete element model for its formation mechanism of numerical simulation. The results show that this kind of dumping deformation mainly develops in the slope with good aero-conditions, soft-hard rock interphase, a wide range of hard rock and rock mass inclination greater than 75 °. The rock mass undergoes bending, dumping, breaking, falling Which formed the body of pouring. In the hard rock, a number of progressive-weakening zones were developed under shearing effect. The fractured surfaces were successively penetrated and exceeded their shear strength. The slopes were subjected to sliding failure along the collapsed fracture surface and the weak zone zone Form a landslide.