干湿循环下宁明粉砂岩宏微观损伤劣化规律研究
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TU452

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寒区高铁隧道基底炭质千枚岩冻-动联合损伤机制及性能恢复;循环冻融石炭系板岩横观各向多源损伤演化机制及抑制


Study on Macro/Micro Damage Degradation Law of Ningming Siltstone under Dry-wet Cycles
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51978668;51578550

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    摘要:

    为揭示干湿循环下广西宁明地区粉砂岩损伤劣化规律,首先通过干湿循环试验模拟了岩石失水-吸水过程,分析了干湿循环作用下粉砂岩饱和含水率、纵波波速变化规律,并研究了干湿循环后粉砂岩的单轴压缩力学参数劣化特性以及微观结构变化,然后以弹性模量定义干湿循环后粉砂岩损伤,并基于Weibull分布定义受荷后粉砂岩的损伤,耦合得到了干湿循环作用下受荷粉砂岩的损伤演化方程。研究表明:随干湿循环次数增加,粉砂岩饱和含水率呈非线性增大,纵波波速、单轴抗压强度、弹性模量呈非线性减小,可采用指数函数进行拟合,且变化趋势均呈现出3个阶段;干湿循环作用对弹性模量劣化程度较单轴抗压强度劣化程度更为显著;阶段劣化度随干湿循环次数的增加而减小,总劣化度随干湿循环次数的增加而增大;峰值应变逐渐增大,岩样塑性得到了显著发展,破坏模式由脆性破坏向延性破坏转变。

    Abstract:

    In order to reveal the damage and deterioration law of siltstone in Ningming area of Guangxi under dry-wet cycle, the process of water loss and water absorption of rock was simulated by dry-wet cycle test. The variation rules of saturated water content and longitudinal wave velocity of siltstone under dry-wet cycle were analyzed. The degradation characteristics of mechanical parameters and microstructure of siltstone after dry-wet cycles were studied. The damage of siltstone after dry-wet cycle is defined, and the damage of siltstone after loading is defined based on Weibull distribution. The damage evolution equation of siltstone under dry-wet cycle is obtained. The results show that the dry-wet cycle times increase, the saturated water content of siltstone increases nonlinearly, the longitudinal wave velocity, uniaxial compressive strength and elastic modulus decrease nonlinearly. The exponential function can be used to fit the water content of siltstone, and the trend of change is three stages; The degradation degree of uniaxial compressive strength is more significant than that of uniaxial compressive strength; The stage degradation decreases with the increase of dry-wet cycles, and the total degradation increases with the increase of dry-wet cycles; The peak strain increases gradually, the failure mode changes from brittle failure to plastic failure, and the plasticity of rock sample develops significantly.

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黄震,胡钊健,张海,等. 干湿循环下宁明粉砂岩宏微观损伤劣化规律研究[J]. 科学技术与工程, 2022, 22(12): 4954-4961.
Huang Zhen, Hu Zhaojian, Zhang Hai, et al. Study on Macro/Micro Damage Degradation Law of Ningming Siltstone under Dry-wet Cycles[J]. Science Technology and Engineering,2022,22(12):4954-4961.

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  • 收稿日期:2021-06-01
  • 最后修改日期:2022-01-07
  • 录用日期:2021-11-12
  • 在线发布日期: 2022-05-07
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