高位崩塌动力碎裂过程物理模型试验研究

doi:10.13722/j.cnki.jrme.2022.1109

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Abstract High-locality rockfalls occur frequently combined with strong dynamic fragmentation phenomenon. However，the insufficient understanding of rockfall fragmentation often causes a large error between the hazard assessment and the actual situation. Therefore，based on the movement characteristics analysis of typical high-locality rockfalls in Guizhou Province，the dominant factors affecting fragmentation are determined. The low-strength and high-brittleness model materials are designed for the physical model test in rockfall dynamic fragmentation. The fragments? movement and deposit features under different conditions are observed and the relationship between fragmentation and its maximum movement distance is evaluated quantitatively. The results show that：(1) The falling height，volume，impact angle and joint setting are the main factors influencing rockfall dynamic fragmentation. (2) The fragmentation phenomenon is concentrated in the first contact with the slope surface. The movement of generated fragments is characterized by stratification. There are small particle-size blocks with “ejection” movement in the upper layer. The large block is rolling in the middle layer，and the fine particle is sliding at the bottom layer. (3) The block distribution characteristics have a concentrated deposit and scattered blocks. But，there is no significant block size distribution along the movement direction. (4) The fragmentation is most sensitive to the impact angle，and the fragmentation degree is positively correlated with the maximum movement distance. The empirical formula is carried out as well. (5) The problem of energy distribution in rockfall dynamic fragmentation needs to be further studied from in-situ experiments and real-time observation.

Key words： engineering geology high-locality rockfalls dynamic fragmentation physical model test quantitative prediction

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	Articles by authors
	HUANG Jian1
	HUANG Xiang2
	WANG Hao1
	LIAO Jianhong1
	HE Zicheng3

Cite this article:

HUANG Jian1,HUANG Xiang2,WANG Hao1, et al. Physical model experimental study on dynamic fragmentation process of high-locality rockfall[J]. , 2023, 42(9): 2164-2174.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1109 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I9/2164

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