黄河某水电站库区Ⅲ#滑坡形成机制研究

倾倒-变形多发生在逆向层状边坡内,但在近几年工程勘查中发现,陡倾顺向边坡也存在该种失稳模式,研究其形成机制对正确评价工程边坡的稳定性有着重要意义。以西北黄河流域某水电站坝前右岸的Ⅲ^#滑坡为例,在地质勘察的基础上,结合数值模拟和定性分析得出滑坡的形成过程分为河谷下切、坡表卸荷,岩层发生倾倒-变形,滑移-拉裂3个阶段,利用UDEC再现了滑坡的形成过程。利用有限元和离散元计算得到的结果互相吻合,证明了结论的合理性。

Formation Mechanism of Landslide in the Reservoir Area ofa Hydropower Station of the Yellow River

Toppling-deformation is usually found in anti-dip bedded slopes.But recent engineering investigations revealed that toppling-deformation mode could also appear in steep dip bedding slope.Analyzing the formation mechanism is of importance for the correct assessment of slope stability.In this article,the landslide III# on the right bank of a hydropower station in the Yellow River Basin was researched by means of numerical simulation and qualitative analysis based on geological surveys.The process of landslide formation was displayed by UDEC(Universal Distinct Element Code).Results indicated that the failure process of the landslide could be divided into three stages: rock mass unloading,toppling deformation,and sliding-tension fracture.The result obtained from finite element method consists with that from discrete element method,which proves that the conclusion is rational.