冻融循环作用后砂岩的动态抗拉性能及能量演化试验研究

doi:10.13722/j.cnki.jrme.2021.0289

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摘要为研究冻融循环对砂岩动态抗拉性能的影响，利用50 mm分离式霍普金森压杆(SHPB)，以3种平均加载率(344.72，371.991和431.761 GPa/s)，对经历6种不同冻融循环次数(0，20，40，60，80和100次)的砂岩进行动态劈裂抗拉测试，并利用核磁共振系统测试冻融循环后砂岩内部孔隙变化，分析冻融循环及加载率对砂岩的破坏特征、动态劈裂抗拉强度及能量演化规律的影响。研究结果表明：(1) 冻融砂岩劣化模型满足指数函数关系，随着冻融循环次数的增加，孔隙度变大，动态劈裂抗拉强度减小，破碎程度增加。冻融循环80次后劣化速率最快。(2) 加载率的提高将弱化冻融循环对砂岩的劣化作用使砂岩半衰期延后。(3) 最大吸收能因加载率的提高而增大的速率随损伤状态的提高而降低。最大吸收能随冻融循环次数的增加呈指数下降，且与动态劈裂抗拉强度呈现良好的正相关。研究结果可为寒区工程中岩石的破坏机制研究提供理论基础。

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	孟凡东
	翟越
	李宇白
	李艳
	张韵生

关键词 ：岩石力学, 冻融循环, 动态劈裂抗拉强度, 能量演化, 孔隙度, 砂岩

Abstract：In order to study the influence of freeze-thaw(FT) cycles on the dynamic tensile properties of sandstone，a 50 mm split Hopkinson pressure bar(SHPB) was used to conduct dynamic Brazilian splitting tests on sandstone samples after different FT cycle numbers(0，20，40，60，80 and 100) under three loading rates(344.72，371.991 and 431.761 GPa/s)，and the change of the cores in the samples due to FT cycles were detected by a nuclear magnetic resonance system The damage characteristics，dynamic tensile strength and energy evolution of sandstone caused by FT cycles and loading rate are analyzed. The research results show that the FT sandstone degradation model satisfies an exponential function. As the number of FT cycles increases，the porosity and the degree of fracture increase，while the dynamic splitting tensile strength decreases. The degradation rate is the fastest after 80 FT cycles. The increase of the loading rate will weaken the degrading effect of the FT cycles on the sandstone and delay the half-life. The increase rate of the maximum absorbed energy caused by the rising of the loading rate decreases with increasing the damage degree. Meanwhile，the maximum absorbed energy decreases with the number of FT cycles in an exponential form while has a good positive correlation with the dynamic splitting tensile strength. The research results can provide a theoretical basis for the study of the failure mechanism of rock mass engineering in cold regions.

Key words： rock mechanics freeze-thaw cycling dynamic tensile strength energy evolution porosity sandstone

引用本文:

孟凡东，翟越，李宇白，李艳，张韵生. 冻融循环作用后砂岩的动态抗拉性能及能量演化试验研究[J]. 岩石力学与工程学报, 2021, 40(12): 2445-2453.
MENG Fandong，ZHAI Yue，LI Yubai，LI Yan，ZHANG Yunsheng. Experimental study on dynamic tensile properties and energy evolution of sandstone after freeze-thaw cycles. , 2021, 40(12): 2445-2453.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0289 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I12/2445

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