摘要
危岩崩塌具有突发性，属于能量快速释放的动力学过程。针对压剪型危岩，提出了压剪型危岩破坏力学模型，建立了主控结构面锁固段切向抗力和剪切位移本构方程；发现危岩动力失稳瞬间系统的临滑聚能将释放并转换为危岩崩落动能，推导建立了危岩主控结构面锁固段断裂扩展所需耗能的计算公式，得到了危岩临滑聚能和临滑释放能量随剪切位移增大的演化曲线，据此提出了危岩突发性破坏后崩塌体弹冲速度和弹冲加速度计算公式。研究成果为进一步分析危岩崩落机制及致灾效应具有一定参考借鉴作用。
Abstract
Perilous rock has a sudden falling feature, which is a dynamic process of rapid energy release. Focusing on the pressure-shear perilous rock, the mechanical model is proposed; and the constitutive equations of locked patch tangential resistance force and shear displacement is established. It obtains that the energy accumulation will release and transform to the elastic and impulsive kinetic energy at the moment of dynamic instability on perilous rock. Meanwhile, it calculates the formulas of fracture extend dissipation energy on the locked patch of dominant fissure. And the evolution curve, which the accumulating and energy release of perilous rock will incrassate with the accretion of shear displacement, is gained. Then, it proposes a method to calculate the elastic and impulsive velocity and acceleration on collapse mass after a sudden collapse. Furthermore, the results provide some scientific basis for further study on collapse mechanism and disaster effects.
关键词
岩石力学 /
弹冲动力参数 /
压剪型危岩 /
主控结构面 /
聚能与释放
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Key words
rock mechanics /
elastic and impulsive dynamic parameters /
tension-shear typed perilous rock /
dominant fissure /
energy accumulation and energy release
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陈洪凯 张瑞刚 唐红梅.
压剪型危岩破坏弹冲动力参数研究[J]. 振动与冲击, 2012, 31(24): 30-33
Chen Hong-kai Zhang Rui-gang Tang Hong-mei .
Study on dynamic parameters for the ruptured pressure-shear perilous rock[J]. Journal of Vibration and Shock, 2012, 31(24): 30-33
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脚注
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