论文部分内容阅读
以某水电站典型的大型近水平顺层坝后滑坡为例,通过现场勘查、室内试验及相关论证,研究了该滑坡的工程地质环境、滑坡特征等,分析了滑坡的成因与演化机制.研究结果表明:在河流强烈下切、后缘不断加载、地下水影响下,近水平软硬互层的顺层斜坡发生层间错动,致使斜坡后缘的拉裂缝形成贯通的软弱带,随软弱层软化,斜坡沿层状岩体软弱层面滑动;在极端条件下,产生软硬相间互层状近水平顺向坡体结构,该坡体结构决定了该区斜坡的演化特征以及滑坡的类型和规模;后期在内外综合因素影响下,滑坡演化具有明显时间和空间差异性的多次滑动.近水平顺层滑坡是滑坡中的常见类型,在力学作用与化学作用的共同影响下,该滑坡具有十分特殊的形成机理和演化过程,并且具有大面积、大规模的群发性特点.
Taking a typical large-scale near-straight dam post-dam landslide of a hydropower station as an example, the geological environment and landslide characteristics of the landslide are studied through on-site investigation, laboratory tests and relevant argumentation, and the causes and evolution mechanisms of the landslide are analyzed. It shows that under the condition of strong undercut, continuous loading of trailing edge and under the influence of groundwater, interlaminar slope of near-horizontal soft-hard interlaminar strata occur between layers, resulting in a soft weak zone extending through the trailing edge of the slope, The slope slides along the weak layer of the stratigraphic rock mass. In extreme conditions, there is an inter-stratified near-horizontal ramp structure between soft and hard phases. The slope structure determines the evolution characteristics of the slope and the type and scale of the landslide. Under the influence of internal and external factors, the landslide evolution has obvious sliding in time and space. The landslide near normal horizon is a common type of landslide. Under the combined effect of mechanics and chemistry, the landslide has a very special Formation mechanism and evolution process, and has a large area, large-scale mass characteristics.