大奔流顺层岩质滑坡溃屈型破坏力学机制研究

溃屈型破坏是顺层岩质边坡一种常见的破坏模式。以大奔流顺层岩质滑坡为例,分析了其溃屈型破坏的形成机制,绿泥石片岩层面发育程度和层面抗剪强度及岩石破碎程度是大奔流滑坡发生的主要地质因素,爆破震动荷载和地下水作用是发生溃屈型破坏的主要诱发因素。基于弹性板梁稳定理论和能量平衡原理,建立了顺层岩质滑坡溃屈型破坏力学模型;通过力学分析,提出了综合考虑滑坡自重、地下水与震动荷载作用的顺层岩质滑坡溃屈段长度条件方程。以大奔流滑坡为实例进行了验算,计算结果和现场破坏特征基本一致,表明了该方法的可行性,为研究顺层岩质滑坡溃屈型破坏的力学机制提供了依据。

Mechanical mechanism of buckling failure of Dabenliu consequent bedding rockslide

Buckling failure is a common failure mode of consequent bedding rockslides. With the Dabenliu landslide as an example, this paper analyzes the formation mechanism of buckling failure of consequent bedding rockslide. The analysis shows the development degree and shear strength of chlorite schist structure plane and rock fragmentation degree are the main geological factors of Dabenliu landslide, and blasting vibration load and groundwater function are the main induced factors. Based on elastic beam stability theory and energy equilibrium principle, the paper establishes a mechanical model of buckling failure of consequent bedding rockslide. Based on mechanical analysis, the paper presents a conditional equation of buckling length, which fully considers both the effect of gravity of landslide, groundwater and vibration load. Then application of the methodology to Dabenliu landslide indicates the calculated result is basically consistent with field failure characteristics, showing the feasibility of the methodology. This study provides a basis for the buckling failure mechanical mechanism of consequent bedding rockslide.