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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摘要为研究饱和度对冻融砂岩动态冲击压缩特性的影响，以饱和度0%，25%，50%，75%和100%的红砂岩为研究对象，分别进行0，25和50次冻融循环后进行动态冲击压缩试验。结果表明：在相同冻融循环次数下，随饱和度的增加，岩样内部冻融损伤作用逐渐加剧，冻融岩样的动态力学性能劣化幅度随饱和度的增加持续增大；当饱和度相同时，随冻融循环次数的增大，岩样的动态力学性能逐渐劣化，表现为峰值强度减小，峰值应变和分形维数增大。饱和度对冻融岩样动态力学性能的影响高于冻融循环次数的影响。当饱和度低于25%时，冻融循环次数的增加对岩样动态力学性能的劣化程度较小；饱和度大于25%时，随冻融循环次数的增加，岩样内部冻融损伤逐渐累积，动态力学性能下降，且饱和度越大，动态力学性能劣化越显著。随饱和度的增加，冻融岩样内部损伤加剧，出现孔隙、沿晶裂隙和穿晶裂隙，岩样基质颗粒之间的胶结能力减弱，导致冲击荷载作用下岩样的破碎程度增加，分形维数增大，能量利用率下降。

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	贾蓬
	卢佳亮
	毛松泽
	郭子铭
	王茵

关键词 ：岩石力学, 饱和度, 冻融循环, 动态力学特性, 损伤, 劣化机制

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

引用本文:

贾蓬，卢佳亮，毛松泽，郭子铭，王茵. 不同饱和度冻融砂岩动态冲击压缩特性及损伤机制研究[J]. 岩石力学与工程学报, 2023, 42(12): 2908-2918.
JIA Peng，LU Jialiang，MAO Songze，GUO Ziming，WANG Yin. Dynamic impact compression characteristics and damage mechanism of freeze-thaw sandstones with different saturation levels. , 2023, 42(12): 2908-2918.

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

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