冰岩碎屑流冲击力学机制的试验研究

doi:10.13722/j.cnki.jrme.2022.1193

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摘要冰岩碎屑流超强流动性和超强冲击破坏力的物理机制尚不明确，基于室内缩尺模型试验，定性开展不同含冰量的冰岩碎屑流运动和冲击过程模拟，分析流速、流深、冲击高度、冲击力随含冰量的演化特征，明确含冰量对冰岩碎屑流流动性和冲击特性的影响。试验结果表明：冰岩碎屑流内摩擦角随含冰量的增加而减小，冰岩碎屑流的流速、流深和冲击挡墙高度随之增加，冰岩碎屑流的流动性得到提高；随着含冰量增加，冰岩碎屑流动力指标增加，但密度减小，使得冰岩碎屑流的最大冲击力随着含冰量的增加呈现出先增加后减小的特点，且含冰量在40%时达到最大值。理论分析表明，冰岩碎屑流的冲击力可以基于动力分量与静力分量之和的冲击力模型进行计算。

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	刘宇桐1
	姜元俊2
	李修磊1
	梁恒2
	宁坡2
	朱元甲2

关键词 ：岩石力学, 冰岩碎屑流, 含冰量, 模型试验, 冲击力

Abstract：The physical mechanism of ice-rock debris flow?s super fluidity and super impact damage remains unclear. In this study，the motion and impact process of ice-rock debris flow with varying ice contents were qualitatively studied through laboratory experimental model tests. The evolution characteristics of flow velocity，flow depth，impact height，and impact force with ice content were analysed. The influence of ice content on the fluidity and impact characteristics of ice-rock debris flow was clarified. The ice content increase leads to a decrease in the internal friction angle of the ice-rock debris flow. Simultaneously，the flow velocity，flow depth，and impact wall height of the ice-rock debris flow increase, enhancing its fluidity. As the ice content increases，the dynamic indicators of the ice-rock debris flow also increase，while the density decreases. This results in a characteristic pattern where the maximum impact force of the ice-rock debris flow initially increases and then decreases with increasing ice content, reaching its peak at 40% ice content. Theoretical analysis suggests that the impact force of the ice-rock debris flow can be calculated by summing the dynamic and static components of the impact force.

Key words： rock mechanics ice-rock debris flow ice content model test impact force

引用本文:

刘宇桐1，姜元俊2，李修磊1，梁恒2，宁坡2，朱元甲2. 冰岩碎屑流冲击力学机制的试验研究[J]. 岩石力学与工程学报, 2023, 42(S2): 4073-4081.
LIU Yutong1，JIANG Yuanjun2，LI Xiulei1，LIANG Heng2，NING Po2，ZHU Yuanjia2. Experimental study the impact mechanism of ice-rock debris flow. , 2023, 42(S2): 4073-4081.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.1193 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/4073

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