降雪、温差作用下大尺寸砂岩风化模拟试验研究

doi:10.13722/j.cnki.jrme.2023.1003

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Abstract Sandstone grotto temples are subject to varying degrees of weathering damage when exposed to freeze-thaw cycles. This study focuses on the North Grottoes in Gansu，employing a multi-faceted approach based on the coupled relationships of numerous environmental factors. Large-scale sandstone weathering simulations were conducted in a sophisticated multi-field coupling laboratory under conditions emulating snowfall-temperature variations. The findings reveal that repetitive snowfall-temperature fluctuations induce freeze-thaw cycles，causing significant microstructural changes in the sandstone. At the microscopic level，freeze-thaw cycles result in the nearly complete dissolution of surface sandstone cementation. Internally，the sandstone exhibits a degradation characterized by a predominant contact-type cementation breakdown，accompanied by a noticeable increase in pore volume and size. Macroscopically，there is a discernible augmentation in the depth of moisture infiltration，coinciding with a progressive expansion of damaged regions and an intensification in the severity of observed deterioration. Surface manifestations include warping，detachment，deepening discoloration，and widening of cracks. Mechanically，there is a gradual decline in strength. Moreover，a categorization of five distinct response-sensitive zones was established based on different sandstone rock types. This classification sheds light on the progressive cumulative weathering mechanism of sandstone under the influence of snowfall-temperature fluctuations.

Key words： rock mechanics sandstone grotto temple freezing-thawing cycles snowfall-temperature fluctuations coupling of multiple variables and factors weathering mechanism

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	LIU Xiaoying1
	2
	3
	4
	GUO Qinglin1
	2
	4
	ZHANG Bo1
	2
	4
	SHANG Dongjuan1
	2
	3
	4
	YU Jing1
	2
	3
	4
	PEI Qiangqiang1
	2
	4

Cite this article:

LIU Xiaoying1,2,3, et al. Simulation experiment study on large-size sandstone weathering under coupling effect of snow and temperature#br#[J]. , 2024, 43(6): 1519-1534.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.1003 OR http://rockmech.whrsm.ac.cn/EN/Y2024/V43/I6/1519

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