澜沧江上游梅里石3号巨型古滑坡成因机制研究

以梅里石3号滑坡为例,经过详细工程地质勘察,定性分析了滑坡的成因机制。结果表明,该滑坡是反倾岩体倾倒变形破坏的产物,其成因机制具有一定的特殊性及研究价值。采用离散元和有限元相结合的方法,研究澜沧江快速下切过程中原始斜坡发生倾倒变形破坏的全过程,即弯曲变形、倾倒—弯曲、倾倒—折断、蠕滑—拉裂4个阶段。地质分析表明滑坡为倾倒变形体发生整体失稳形成,数值模拟中岩体倾倒变形各阶段的变形破坏特征与地质分析相互印证,与实际情况相符。

Study on formation mechanism of Meilishi No.3 Giant Ancient Landslide on upstream of Lancangjiang River

By taking Meilishi No.3 Giant Ancient Landslide as the study case，the formation mechanism of the landslide is qualitatively analyzed herein through a detailed engineering geological investigation. The result shows that the landslide is the product from the toppling deformation of anti-dip rockmass，of which the formation mechanism has certain particularity and study value. Therefore，the full process of failure from toppling deformation of the original slope，i.e. the four phases： bending deformation，toppling-bending，toppling-breaking and creep sliding-pull cracking，during the quick down-cutting of Lancangjiang River is studied with the method integrated with both the discrete element method and finite element method. The geological analysis shows that the landslide is formed by the overall instability caused by the toppling deformation body，while the deformation failure characteristics in all the phases of the toppling deformation of the rock mass obtained from the relevant numerical simulation can be verified with those from the geological analysis each other，and then accord with those of the actual situation.