低温/饱水耦合作用下红砂岩静动态II型断裂特性试验研究

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摘要利用伺服压力机、分离式霍普金森压杆对干燥室温、饱水室温、-40 ℃干燥冻结和-40 ℃饱水冻结四种工况下的红砂岩试件分别进行了静、动态短芯压剪试验；通过分析对比静、动态以及动态范围内不同加载率下的断裂韧度、断裂能等参数变化规律，研究了低温和水饱和效应对红砂岩的II型断裂力学特性的影响并探讨了二者的作用机制。结果表明：①水对砂岩II型断裂韧度与断裂能产生弱化效应，水饱和红砂岩静态II型断裂韧度为干燥下的77%；②冻结作用使得红砂岩静、动态断裂韧度分别提升36%和18%以上，静态荷载下干燥冻结砂岩II型断裂韧度最高，动态荷载下饱水冻结砂岩具有最大的II型断裂韧度；③冻结与干燥室温红砂岩断裂韧度率敏感性近似相同，而饱水室温红砂岩具有最高的II型断裂韧度率敏感性和动态增强因子。

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	谢凯迪
	邱艳宇
	邢灏喆

关键词 ：岩石动力学, II型断裂, 冻结红砂岩, 水饱和, 率效应

Abstract：Short core compression (SCC) tests were conducted on dry and water-saturated specimens at room temperature and -40 ℃ by a hydraulic servo-control testing machine and split Hopkinson pressure bar (SHPB). The effect of low temperature and water saturation on the Mode-II fracture properties of red sandstone was investigated through comparative studies on fracture toughness and fracture energy between quasi-static and dynamic fracturing conditions. The mechanism of the coupled effect of water saturation and low temperature on fracture behavior was also discussed. Results showed that: ① Water saturation weakened the Mode-II fracture toughness of red sandstone, and the Mode-II fracture toughness of water-saturated red sandstone was 77% that of the dry one. ② Freezing effect increased the fracture toughness of red sandstone by more than 36% and 18% for static and dynamic loading conditions, respectively. Dry-frozen specimen had the highest fracture toughness under the static fracturing, while the saturated-frozen specimen possessed the highest dynamic fracture toughness. ③ Frozen and dry sandstone shared almost the same sensitivity to the loading rate, whereas, the water-saturated sandstone had the largest rate sensitivity and dynamic increase factor.

Key words： rock dynamics Mode-II fracturing frozen red sandstone water saturation rate dependency

收稿日期: 2022-06-06 出版日期: 2023-08-28

引用本文:

谢凯迪，邱艳宇，邢灏喆. 低温/饱水耦合作用下红砂岩静动态II型断裂特性试验研究[J]. 振动与冲击, 2023, 42(16): 236-242.
XIE Kaidi, QIU Yanyu, XING Haozhe. Coupled effects of water and low temperature on quasistatic and dynamic mode-II fracture properties of red sandstone. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(16): 236-242.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I16/236

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