气候变化领域集成服务门户(CCPortal): Fracture mechanism of rock collapse in the freeze–thaw zone of the eastern Sichuan–Tibet Mountains under seasonal fluctuating combinations of water and heat

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DOI	10.1007/s11069-021-04781-y
	Fracture mechanism of rock collapse in the freeze–thaw zone of the eastern Sichuan–Tibet Mountains under seasonal fluctuating combinations of water and heat
	Wu Y.; Li X.; Zhu L.
发表日期	2021
ISSN	0921030X
起始页码	2309
结束页码	2333
卷号	108 期号:2
英文摘要	In the freeze–thaw zone of the eastern Sichuan–Tibet Mountains, the phases of water in cracks show strong seasonal variations, which significantly affect the stability of perilous rocks. However, few studies have clearly addressed the role of water/ice in crack development from a fracture mechanics viewpoint to explain the seasonality of rock collapse. In this study, we built physical models from a fracture mechanics viewpoint to calculate water-freezing stress, hydrostatic pressure, and their combinations induced by water/ice in cracks and show the crack propagation mechanism under temperature fluctuations in different seasons in mountainous regions. On the basis of these models, we calculate fracture conditions, simulate the crack process, and illustrate the rock collapse mechanism in different seasons using the extended finite element method. The results indicate that different phases of water, which induce stress under spatiotemporal fluctuations of temperature, determine the various propagation styles and influence what kind and when a collapse will occur. The collapse of fractured rocks in different seasons generally results from rock damage accumulation owing to the initiation, propagation, and connection of primary cracks under freezing stress or hydrostatic pressure or different combinations of these processes. © 2021, The Author(s), under exclusive licence to Springer Nature B.V.
关键词	Combination of water and heat Eastern Sichuan–Tibet Fracture mechanics Rock collapse Seasonal temperature fluctuation
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206668
作者单位	Key Laboratory of Mountain Hazards and Surface Process, CAS, Chengdu, 610041, China; Institute of Mountain Hazards and Environment, CAS, No. 9, 4th Section, Renminnanlu, Chengdu, 610041, China
推荐引用方式 GB/T 7714	Wu Y.,Li X.,Zhu L.. Fracture mechanism of rock collapse in the freeze–thaw zone of the eastern Sichuan–Tibet Mountains under seasonal fluctuating combinations of water and heat[J],2021,108(2).
APA	Wu Y.,Li X.,&Zhu L..(2021).Fracture mechanism of rock collapse in the freeze–thaw zone of the eastern Sichuan–Tibet Mountains under seasonal fluctuating combinations of water and heat.Natural Hazards,108(2).
MLA	Wu Y.,et al."Fracture mechanism of rock collapse in the freeze–thaw zone of the eastern Sichuan–Tibet Mountains under seasonal fluctuating combinations of water and heat".Natural Hazards 108.2(2021).