陡倾顺层岩质斜坡倾倒变形破坏特征研究

 顺层岩质斜坡是常见的斜坡结构类型之一，对该类斜坡的变形破坏特征以及形成机制研究已较深入，一般认为顺层岩质斜坡的变形破坏以滑移–拉裂、滑移–弯曲(或溃曲)模式为特征。通过系统的文献收集及大量现场调查发现，陡倾顺层岩质斜坡还存在一种典型的变形破坏形式，即倾倒变形。结合具体的陡倾顺层岩质斜坡倾倒变形破坏的实例，详细分析、总结该类斜坡发育的地质环境条件及变形破坏特征，在此基础上结合典型斜坡分析陡倾顺层岩质斜坡倾倒变形是在河谷演化、成坡过程中，岩层在平行坡面的最大主应力作用下由坡脚开始从下至上作悬臂梁弯曲，最终导致岩层根部折断，形成倾倒体；当坡体内折断带的剪应力超过其抗剪强度时，坡体将发生滑动形成滑坡。

STUDY ON TOPPLING DEFORMATION AND FAILURE CHARACTERISTICS OF STEEP BEDDING ROCK SLOPE

Bedding rock slope is one of the common slope types. The intensive studies have been done for its slope deformation，failure characteristics and formation mechanism. Generally，it is believed that slip-rupture and slip-bending are main characteristics of deformation and failure of bedding rock slope. Through the collection of systemic references and great amounts of location investigation，it is found that there is another typical form of deformation and failure for steep bedding rock slope，namely，toppling deformation. Combining the typical engineering cases of steep bedding rock slopes with deformation and failure characteristics，the geological conditions and the deformation and failure characteristics of this kind slope are summarized and analyzed. Based on these studies，it is shown that in the process of valley evolution and slope-formation and under the maximum principal stress at the foot of slope，which is parallel to slope，rock stratum bends from top to bottom as a cantilever beam，finally its root will be broken off，and a toppling body comes into being. When the maximum shear stress is greater than the shear strength in the snapped zone of the slope，it will slip and landslide happens.