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单侧干湿循环下不同粒径砂岩孔隙结构和能量演化研究

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为研究单侧干湿循环对不同粒径砂岩的影响,以红砂岩和灰砂岩为研究对象,采用核磁共振技术对不同干湿循环次数下的饱水砂岩和不同时间段浸水砂岩进行测试,研究孔隙结构特征和渗透性;通过单轴压缩试验,对两种砂岩的力学特性和能量演化进行探讨.结果表明,随着干湿循环次数的增加,不同时间浸水下的灰砂岩比红砂岩先达到饱和,具有较好的渗透性;当干湿循环达到60次时,核磁成像结果表明两种砂岩都出现具有方向性的损伤累积现象,且灰砂岩损伤累积程度比红砂岩大;在单轴压缩试验中灰砂岩的单轴抗压强度和弹性模量总劣化度均比红砂岩大.
Pore Structure and Energy Evolution of Sandstone with Different Particle Sizes under Unilateral Wet and Dry Cycle
To study the effect of the unilateral wet and dry cycle on the sandstone with different particle sizes,the red sand-stone and the gray sandstone samples were used in the study.The nuclear magnetic resonance method was used to test the satu-rated sandstone under different wet-dry cycle times and the water-soaked sandstone samples at different time periods to study the pore structure characteristics and the permeability.Through the uniaxial compression tests,the mechanical properties and the energy evolution of the two sandstone samples are discussed.The results show that with the increase of the dry and wet cy-cles,the gray sandstone samples under different time of water immersion reaches saturation first than the red sandstone sam-ples and have a better permeability.When the dry-wet cycle reaches 60 times,the results of the NMR imaging show that both sandstone samples have directional damage accumulation,and the damage accumulation degree of the gray sandstone samples is greater than that of the red sandstone samples.In the uniaxial compression tests,the uniaxial compressive strength and the to-tal deterioration degree of the elastic modulus of the gray sandstone samples are larger than that of the red sandstone samples.

Unilateral Wet and Dry CycleNuclear Magnetic ResonancePore StructureMechanical PropertiesEnergy Evo-lution

马家宝、毕靖

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贵州大学土木工程学院,贵阳 550025

单侧干湿循环 核磁共振 孔隙结构 力学特性 能量演化

国家自然科学基金国家自然科学基金

5216400152064006

2024

土工基础
湖北省土木建筑学会,中国科学院武汉岩土力学研究所,武汉市土木建筑学会

土工基础

影响因子:0.238
ISSN:1004-3152
年,卷(期):2024.38(3)