平推式滑坡后缘启动水头探讨

Discussion on starting water head in trailing edge of translational landslide

平推式滑坡是一类特殊的斜坡失稳模式,通常规模较大,滑面倾角极缓甚至反倾坡内,其失稳机理也与传统的极限平衡理论相悖,因而此类滑坡的启动判据是研究重点和关键。在平推式滑坡形成条件及启动过程分析基础上,运用偏最小二乘法回归分析已有滑坡数据,获得滑动时临界水头统计模型,进而与通过力学分析得到的启动判据模型进行综合对比,发现力学模型优于统计模型,最终选择力学模型,并通过实例分析启动判据的应用效果。

Translational landslide is a special kind of slope instability mode,which is generally characterized by huge size.Its slip surface is of extremely gentle angle or even counter-inclined.Its instability mechanism is in contrast with traditional limit equilibrium theory and its landslide start criterion is the key point of research.Based on analyzing the formation conditions and starting process of a translational landslide,the existing landslide data was analyzed by using partial-least squares regression,and the statistical model of the critical head was obtained.Then,the statistical model was compared with the start criterion model obtained by mechanical analysis.The result showed that mechanical model was better.Finally,the mechanical model was selected and the application was expounded by an engineering example.