水岩作用下花岗岩动态冲击压缩特性及损伤时效性研究

doi:10.13722/j.cnki.jrme.2023.0970

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摘要了解水岩作用下岩石动力学特性及损伤时效性对深部岩石工程灾变预防具有重要意义。为研究水岩作用时间对花岗岩动态冲击压缩特性及损伤特性影响，使用分离式霍普金斯压杆(SHPB)系统对不同浸泡时间的试件进行冲击压缩试验，结果显示，水浸泡处理提高了花岗岩强度对加载率的敏感性，低加载速率下强度软化因子与时间线性负相关。此外，通过光学显微镜、原子力显微镜、等离子质谱仪和核磁共振系统观察纯净水浸泡0，2，4，6个月的花岗岩表面和内部微观结构变化，优化孔隙损伤演化模型，计算发现6个月未达孔隙损伤阈值。最后量化分析水岩作用时间特性，解释化学损伤与孔隙损伤的时效性差异。结果表明，水岩物理、化学作用共同促进孔隙发育，但时间特性不同，化学作用随时间增长而减缓，物理作用反之。

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	黄耀莹1
	翟越1
	王铭2
	李宇白1
	李艳1

关键词 ：岩石力学, 花岗岩, 水岩作用, 动态冲击压缩特性, 损伤演化, 时效性

Abstract：Understanding the dynamic characteristics and time-dependent damage of rocks under water-rock interactions is crucial for mitigating deep-seated rock engineering hazards. To investigate the impact of water-rock interaction time on the dynamic impact compression characteristics and damage properties of granite，impact compression tests were conducted using a split Hopkinson pressure bar(SHPB) system on specimens subjected to varying immersion time. The results indicate that water immersion treatment enhances the sensitivity of granite strength to loading rates. Specifically，at lower loading rates，there is a linearly negative correlation between the strength softening factor and immersion time. Furthermore，optical microscopy，atomic force microscopy，plasma mass spectrometry and nuclear magnetic resonance techniques were employed to observe surface and internal microstructural changes in granite immersed for durations of 0，2，4，and 6 months. Optimization of the pore damage evolution model revealed that the pore damage threshold was not exceeded within the 6-month immersion period. Finally，Lastly，quantitative analysis of the temporal aspects of water-rock interactions distinguishes between chemical and pore damage mechanisms. The results indicate that physical and chemical interactions jointly promote pore development in granite，albeit with contrasting temporal behaviors: chemical interactions decelerate over time, whereas physical interactions exhibit an opposite trend.

Key words： rock mechanics granite water-rock interaction dynamic mechanical characteristics damage evolution temporal behaviors

引用本文:

黄耀莹1，翟越1，王铭2，李宇白1，李艳1. 水岩作用下花岗岩动态冲击压缩特性及损伤时效性研究[J]. 岩石力学与工程学报, 2024, 43(S2): 3759-3770.
HUANG Yaoying1，ZHAI Yue1，WANG Ming2，LI Yubai1，LI Yan1. Study on the influence of water-rock interaction time on dynamic impact compression characteristics and damage of granite. , 2024, 43(S2): 3759-3770.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0970 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS2/3759

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