Degradation characteristics of I/II mixed-mode fracture toughness of sandstone under action of chemical solution and drying-wetting cycles

被引：0
|
作者：
Liu X. [1 ,2 ,3 ]
Miao L. [1 ,2 ,3 ]
Yuan W. [4 ]
Zhou W. [1 ,2 ,3 ]
机构：
[1] School of Civil Engineering, Chongqing University, Chongqing
[2] National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area, Chongqing
[3] Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University, Ministry of Education, Chongqing
[4] Bureau of Public Works of Shenzhen Municipality, Shenzhen
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2023年 / 45卷 / 10期
关键词：
acid and alkaline environment; degradation; drying-wetting cycle; generalized maximum tangential stress criterion; I/II mixed-mode fracture toughness;
D O I：
10.11779/CJGE20220909
中图分类号：
学科分类号：
摘要：
To explore its degradation laws under the action of drying-wetting cycles in a chemical solution, the Ⅰ/Ⅱ mixed-mode fracture toughness of sandstone is obtained through the semi-circular bending tests (SCB) after experiencing 1, 3, 6 and 10 times of drying-wetting cycles in immersion solution of pH equal to 7, 9 and 4. The test results show that with the increase of the times of drying-wetting cycles, the deterioration degree of fracture toughness of sandstone gradually increases, and the deterioration rate gradually slows down. In an acid environment (pH=4), the deterioration degree is the largest, followed by that in alkaline environment and that in neutral environment. The fracture toughness of mode Ⅱ is less degraded than that of mode Ⅰ. Then, based on the test results, a large error is found when using the maximum tangential stress (MTS) criterion to identify the composite crack dominated by mode Ⅱ fracture, while the generalized maximum tangential stress (GMTS) criterion can better match the test results. Finally, based on the GMTS criterion, the degradation characteristics are analyzed. With the increasing degradation degree of fracture toughness, the absolute value of T-stress and the critical polar radius rc gradually decrease. The moisture condition of samples has almost no effects on rc, which confirms that rc is a parameter reflecting the structural quality. © 2023 Chinese Society of Civil Engineering. All rights reserved.
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页码：2148 / 2155
页数：7
相关论文
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