冻融环境下不同饱和度砂岩损伤演化特征研究

doi:10.13722/j.cnki.jrme.2021.0089

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摘要为探究冻融环境下不同饱和度砂岩的损伤演化规律，通过冻融循环、CT扫描和单轴压缩试验，结合三维可视化软件及分形理论，对冻融过程中自然含水、不完全饱水和完全饱水砂岩的孔隙率、渗透率、孔喉参数、分形维数及宏观力学指标的演化过程进行定量分析。结果表明：(1) 冻融作用下含水饱和度决定了岩样冻融损伤的程度，完全饱水砂岩损伤劣化最为剧烈，自然含水状态损伤程度最低，饱和度是造成岩石冻融损伤的主因；(2) 完全饱水砂岩细观结构具有高度非均质性，其孔隙率、渗透率、孔隙参数、喉道参数及分形维数均随冻融次数增加呈指数型增长，自然含水和不完全饱水状态呈直线型增长，孔隙率、渗透率均与分形维数成正相关，冻融损伤为产生小孔隙和增加原喉道长度；(3) 3种含水状态砂岩强度、弹性模量随冻融次数增加均呈直线型降低，150次冻融后，完全饱水岩样强度下降了98.53%，分别是自然含水、不完全饱水的1.68和1.26倍，宏观力学强度与孔隙率、分形维数成负相关，岩石细观结构是影响宏观力学特性的关键；(4) 初始冻融荷载损伤变量即为对应冻融次数下的冻融损伤变量，损伤演化曲线有明显的阶段特征，加载过程中损伤变量由下凹形上升到上凸形增长再到平缓增加。研究成果将为科学评价寒区冻融环境下岩体工程的长期稳定性提供理论依据。

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	宋勇军
	杨慧敏
	谭皓
	任建喜
	郭玺玺

关键词 ：岩石力学, 冻融循环, 饱和度, CT重构, 分形维数, 损伤演化

Abstract：In order to explore the damage evolution law of sandstone with different saturations under freeze-thaw environment，through freeze-thaw cycle，CT scanning and uniaxial compression test，and combined with three-dimensional visualization software and fractal theory，the evolution processes of porosity，permeability，pore parameters，throat parameters，fractal dimension and macroscopic mechanical indexes of natural water-bearing，incompletely saturated and completely saturated sandstone samples during the freeze-thaw process are quantitatively analyzed. The results show that the degree of freeze-thaw damage of rock samples is determined by the water saturation during freeze-thaw. Specifically，the damage deterioration of the completely saturated sandstone is the most severe while the damage degree of the natural water-bearing sandstone is the lowest. The meso-structure of the completely saturated sandstone is highly heterogeneous，and its porosity，permeability，pore parameters，throat parameters and fractal dimension all increase exponentially with increasing the freeze-thaw number. However，for the natural water-bearing sandstone and the incompletely saturated sandstone，these parameters increase linearly with increasing the freeze-thaw number. The porosity and the permeability of the samples are positively correlated with the fractal dimension，and freeze-thaw damage mainly presents in producing small pores and increasing the length of the original throat. The strength and the elastic modulus of three kinds of saturated sandstone samples decrease linearly with increasing the freeze-thaw number. After 150 freeze-thaw times，the strength of the completely saturated sandstone decreases by 98.53%，which is respectively 1.68 and 1.26 times higher than that of the natural water-bearing sandstone and the incompletely saturated sandstone. The macroscopic mechanical strength is negatively correlated with the porosity and the fractal dimension，and the meso-structure of rock is the key to affect the macroscopic mechanical properties. The initial freeze-thaw load damage variable is the freeze-thaw damage variable under the corresponding freeze-thaw number. The damage evolution curve has obvious stage characteristics，and the damage variable increases from concave to convex and then to gentle in the process of loading. The research results will provide a theoretical basis for the scientific evaluation of the long-term stability of rock mass engineering under the freeze-thaw environment in cold regions.

Key words： rock mechanics freeze-thaw cycle saturation CT reconstruction fractal dimension damage evolution

引用本文:

宋勇军，杨慧敏，谭皓，任建喜，郭玺玺. 冻融环境下不同饱和度砂岩损伤演化特征研究[J]. 岩石力学与工程学报, 2021, 40(8): 1513-1524.
SONG Yongjun，YANG Huimin，TAN Hao，REN Jianxi，GUO Xixi. Study on damage evolution characteristics of sandstone with different saturations in freeze-thaw environment. , 2021, 40(8): 1513-1524.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0089 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I8/1513

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