理论与试验研究

酸作用时间对页岩微观特征和力学性质的影响

  • 柳兵 ,
  • 党炜 ,
  • 聂毓斌
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  • 中国水利水电第四工程局有限公司,西宁 810000
柳兵(1985—),男,湖北咸宁人,高级工程师, 主要从事隧道工程领域的相关工作。E-mail:342086908@qq.com

收稿日期: 2023-11-16

  网络出版日期: 2024-05-09

基金资助

国家自然科学基金(52178395)

Effect of Acid Action Time on Microscopic and Mechanical Properties of Shale

  • Bing Liu ,
  • Wei Deng ,
  • Yubin Nie
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  • Sinohydro Engineering Bureau 4 Co., Ltd., Xining 810000, P.R. China

Received date: 2023-11-16

  Online published: 2024-05-09

摘要

为探究页岩性质随酸性溶液作用时间的演化规律,采用CT扫描、核磁共振技术和单轴压缩实验对不同时间(0~80 d)处理后页岩的孔隙特征和力学性质演化规律进行了表征和分析。结果表明:由于矿物的溶蚀作用,随着酸溶液浸泡时间的增加,页岩基质中逐渐形成新的细观裂缝并不断扩展,页岩的总孔、大孔和中孔孔隙度逐渐增加,而微孔孔隙度逐渐减少;分形维数随酸溶液浸泡时间的增加逐渐递增,页岩的孔隙结构越来越复杂;酸性水溶液下孔隙度增大增强了页岩的损伤变量,最终导致了页单轴压缩强度和弹性模量弱化。

本文引用格式

柳兵 , 党炜 , 聂毓斌 . 酸作用时间对页岩微观特征和力学性质的影响[J]. 地下空间与工程学报, 2024 , 20(2) : 480 -487 . DOI: 10.20174/j.JUSE.2024.02.14

Abstract

To explore the evolution of shale properties with the action time of acid solution, CT scanning, nuclear magnetic resonance technology and uniaxial compression experiment were carried out. The pore characteristics and mechanical properties evolution of shale after different treatment time (0~80 days) were characterized and analyzed. The results show that with the increase of immersion time of acid solution, new meso-fractures are gradually formed in the shale matrix and expand continuously, the total pore, macropore and mesopore porosity of shale increase gradually, while the micropore porosity decreases gradually. The fractal dimension increases gradually with the increase of acid immersion time, which means the pore structure of shale becomes more and more complex. The increase of porosity in acidic aqueous solution enhances the damage variable of shale, and finally leads to the weakening of uniaxial compressive strength and elastic modulus.

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