不同饱和度冻融砂岩动态冲击压缩特性及损伤机制研究

doi:10.13722/j.cnki.jrme.2023.0242

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Abstract To investigate the impact of saturation on the dynamic impact compression properties of freeze-thawed sandstone，red sandstone specimens with saturations ranging from 0% to 100% were subjected to dynamic impact compression tests following 0，25 and 50 freeze-thaw cycles. The findings reveal that，for the same number of freeze-thaw cycles，increasing saturation leads to a progressive deterioration in the dynamic mechanical properties of the rock samples. Similarly，when saturation levels are held constant，greater numbers of freeze-thaw cycles result in diminishing dynamic mechanical properties，characterized by reduced peak strength，heightened peak strain，and increased fractal dimensions. Notably，the influence of saturation on the dynamic mechanical properties of freeze-thawed rock samples is more substantial than that of the freeze-thaw cycle count. When the saturation level is below 25%，the increase in freeze-thaw cycles has a comparatively minor impact on the dynamic mechanical properties of the rock samples. Conversely，when the saturation exceeds 25%，the cumulative freeze-thaw damage within the rock samples intensifies with additional freeze-thaw cycles，leading to a more pronounced deterioration in dynamic properties. As saturation levels rise，internal damage within the freeze-thawed rock samples becomes more severe，resulting in the development of pores，intergranular，and intragranular cracks. This，in turn，amplifies the fragmentation of the rock samples when subjected to impact loads and diminishes energy utilization during impact.

Key words： rock mechanics saturation degree freeze-thaw cycles dynamic mechanical properties damage deterioration mechanism

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	Articles by authors
	JIA Peng
	LU Jialiang
	MAO Songze
	GUO Ziming
	WANG Yin

Cite this article:

JIA Peng,LU Jialiang,MAO Songze, et al. Dynamic impact compression characteristics and damage mechanism of freeze-thaw sandstones with different saturation levels[J]. , 2023, 42(12): 2908-2918.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0242 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I12/2908

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