干湿循环下pH值对砂岩静态单轴力学特性的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (7): 2232-2239.

干湿循环下pH值对砂岩静态单轴力学特性的影响

袁璞^1,2,3, 步鹤¹, 位宁宁¹

1.安徽理工大学土木建筑学院,淮南 232001;
2.安徽理工大学,矿山地下工程教育部工程研究中心,淮南 232001;
3.安徽理工大学,深部煤矿采动响应与灾害防控国家重点实验室,淮南 232001

收稿日期:2021-03-10 修回日期:2021-03-29 出版日期:2021-07-15 发布日期:2021-08-04
通讯作者: 步鹤,硕士研究生。Email:buhe19961209@163.com
作者简介:袁璞(1987—),男,博士,副教授。主要从事岩石动力学方面的研究。Email:puy2012@163.com
基金资助:
安徽省自然科学基金(1808085QE148);中国博士后科学基金(2018M642504);安徽省教育厅科学研究项目(KJ2017A097)

Effect of pH Value on Static Uniaxial Mechanical Properties of Sandstone under Dry-Wet Cycle

YUAN Pu^1,2,3, BU He¹, WEI Ningning¹

1. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China;
2. Engineering Research Center of Underground Mine Construction, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China;
3. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China

Received:2021-03-10 Revised:2021-03-29 Online:2021-07-15 Published:2021-08-04

摘要/Abstract

摘要： 为研究不同pH值溶液干湿循环作用对砂岩力学性能劣化的影响,采用pH值为3、5、6.5(蒸馏水)和7的 4种溶液对砂岩进行干湿循环作用,对经历0次(干燥状态)、1次、10次和20次干湿循环作用的砂岩进行纵波波速测定、吸水率试验、XRD试验和单轴抗压试验。试验结果表明:pH值相同时,随着干湿循环次数的增加,砂岩试件的单轴抗压强度逐渐降低;干湿循环次数相同时,随着溶液pH值的减小,砂岩试件的纵波波速呈下降趋势,吸水率逐渐增加,内部矿物成分发生变化,单轴抗压强度逐渐下降并趋于稳定。酸性溶液干湿循环作用下砂岩试件的劣化程度要比中性溶液更为严重,pH值越小劣化程度越大。

关键词: 干湿循环, pH值, 劣化, 静态, 单轴抗压强度

Abstract: In order to study the effect of dry-wet cycles of solutions with different pH values on the deterioration of mechanical properties of sandstone, four solutions with pH values of 3, 5, 6.5 (distilled water) and 7 were used to perform dry-wet cycles on sandstone. Sandstone specimens with 0 times (dry state), 1 times, 10 times and 20 times of dry-wet cycles were subjected to longitudinal wave velocity measurement, water absorption test, XRD test and uniaxial compression test. Test results show that under the same pH value of the solution, the uniaxial compressive strength of sandstone specimens decreases gradually with the increase of dry-wet cycles. When the number of dry-wet cycles is the same, as the pH value of solution decreases, longitudinal wave velocity of sandstone specimens decreases, water absorption gradually increases, the internal mineral composition changes, and uniaxial compressive strength gradually decreases and tends to be stable. The deterioration of sandstone specimens under dry-wet cycles of acidic solution are more serious than that of neutral solution, and the lower the pH value is, the greater the deterioration is.

Key words: dry-wet cycle, pH value, deterioration, static, uniaxial compressive strength

中图分类号:

TU452

袁璞, 步鹤, 位宁宁. 干湿循环下pH值对砂岩静态单轴力学特性的影响[J]. 硅酸盐通报, 2021, 40(7): 2232-2239.

YUAN Pu, BU He, WEI Ningning. Effect of pH Value on Static Uniaxial Mechanical Properties of Sandstone under Dry-Wet Cycle[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2232-2239.

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