冻融灰岩单轴声发射损伤特性试验研究

doi:10.13722/j.cnki.jrme.2021.0307

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摘要为探究冻融及轴向载荷作用下灰岩力学特性演化规律及内部细观结构渐进损伤特征，开展不同冻融循环次数灰岩单轴声发射试验，获得相应的物理力学参数，分析声发射信号与冻融灰岩内部微裂纹活动的相关性，定量研究冻融灰岩损伤累积变化规律，阐明冻融灰岩损伤劣化机制。结果表明：随着冻融次数的增加，灰岩单轴抗压强度、弹性模量、泊松比逐渐降低，冻融80次后分别折减61.43%，48.42%，17.33%，峰值应变点逐渐后移；声发射振铃计数变化过程可分为平静阶段、增长阶段、陡增阶段；随着冻融次数增加，灰岩单轴声发射信号活跃且呈局部高密度释放特征，声发射b值呈“V”型变化，动态b值局部突降表明大尺度裂纹产生，灰岩内部裂纹类型由剪切裂纹向拉伸裂纹阶段过渡，对应岩样由剪切破坏转为劈裂破坏；冻融0，10，20次灰岩损伤变量呈突变或渐进突变特征，冻融40，60，80次灰岩损伤变量呈分段渐进式增长；水冰相变引起孔隙结构体积膨胀、孔隙局部冰结造成的细观水压致裂现象及自由水动力学响应是造成灰岩冻融损伤的主因。

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	宋彦琦1
	2
	马宏发2
	刘济琛2
	李向上2
	郑俊杰2
	傅航2

关键词 ：岩石力学, 冻融循环, 单轴压缩, 声发射, 损伤, 劣化机制

Abstract：In order to explore the evolution law of mechanical properties of limestone and progressive damage characteristics of internal meso structure under the effects of freeze-thaw and uniaxial load，the uniaxial compression and acoustic emission monitoring tests of limestone with different freeze-thaw cycles were carried out. Firstly，the physical and mechanical parameters evolution law was obtained. Then，the correlation between acoustic emission signal and microcrack activity in freeze-thaw limestone was analyzed. Meanwhile，the damage cumulative change rule was quantitatively studied. Finally，the deterioration mechanism of freeze-thaw damage of limestone was clarified. The results show that the uniaxial compressive strength，elastic modulus and Poisson?s ratio of limestone decrease gradually with the increase of freeze-thaw cycles，and accompanied with the final discount rate to 61.43%，48.42% and 17.33%，respectively. However，there is gradual increase in the peak strain. The acoustic emission ringing count change process can be divided into calm stage，growth stage，and steep increase stage. As the increase of freeze-thaw cycles，the uniaxial acoustic emission signal of limestone is active with the local high-density released characteristics，and the acoustic emission b value presents a “V”-shaped change. Meanwhile，the local sudden drop of the dynamic b value indicates that large-scale cracks have been generated. Moreover，the type of internal microcracks in the limestone converts from shear to tensile，which contributes to the failure change from shear to split. The damage variables of limestone，which presents with a trend of abrupt or gradual mutation after 0，10 and 20 freeze-thaw cycles，increase gradually after 40，60 and 80 freeze-thaw cycles. In addition，the main causes of freeze-thaw damage of limestone are the volume expansion of pore and fissure structures caused by water-ice transformation，meso hydraulic fracture caused by local ice accretion and the free hydrodynamic response.

Key words： rock mechanics freeze-thaw cycle uniaxial compression acoustic emission damage deterioration mechanism

引用本文:

宋彦琦1，2，马宏发2，刘济琛2，李向上2，郑俊杰2，傅航2. 冻融灰岩单轴声发射损伤特性试验研究[J]. 岩石力学与工程学报, 2022, 41(S1): 2603-2614.
SONG Yanqi1，2，MA Hongfa2，LIU Jichen2，LI Xiangshang2，ZHENG Junjie2，FU Hang2. Experimental investigation on the damage characteristics of freeze-thaw limestone by the uniaxial compression and acoustic emission monitoring tests. , 2022, 41(S1): 2603-2614.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0307 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/2603

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