长江巫峡望霞危岩破坏解体特征分析

Study on damage disintegrating characteristic of Wangxia perilous rock in Wu Gorge of Yangtze River

针对长江巫峡望霞危岩在失稳崩落过程中由整体分解成碎块,形成大量碎块状落石的现象,从能量角度出发建立了崩落危岩系统的能量转化状态函数及能量平衡方程。将危岩破坏解体视为能量耗散与能量释放的综合结果,建立了危岩崩落中危岩体系统的能量释放与能量耗散的计算方法。计算结果表明,当崩落危岩体系统内部释放的能量超过解体所需的耗散能时,危岩解体破坏。关于危岩解体破坏特征的分析,为危岩崩落中出现的解体行为与特性提供了科学解释。

Wangxia perilous rock in Wu Gorge of Yangtze River split to fragments during a falling process, which formed large amount of fragmented falling rocks. We interpret this phenomenon from an aspect of energy dissipation and release, and the ener- gy transforming state function and energy balance of failing rocky system are established. The calculating results show that the damage of perilous rock happens when the energy released in the rocky system exceeds the dissipation energy needed for crack propagation. The result can provide certain reference value for further research on the disaggregation mechanism and characteris- tics of perilous rock.