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

LIU Xinrong; MIAO Luli; YUAN Wen; ZHOU Weifeng

doi:10.11779/CJGE20220909

Volume 45 Issue 10

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Chinese Journal of Geotechnical Engineering > 2023 > 45(10): 2148-2155. > DOI: 10.11779/CJGE20220909

LIU Xinrong, MIAO Luli, YUAN Wen, ZHOU Weifeng. Degradation characteristics of Ⅰ/Ⅱ mixed-mode fracture toughness of sandstone under action of chemical solution and drying-wetting cycles[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(10): 2148-2155. DOI: 10.11779/CJGE20220909

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

LIU Xinrong^{1, 2, 3,},
MIAO Luli^{1, 2, 3, ,},
YUAN Wen⁴,
ZHOU Weifeng^{1, 2, 3}

1.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area, Chongqing 400045, China
3.
Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, China
4.
Bureau of Public Works of Shenzhen Municipality, Shenzhen 518000, China

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Received Date: July 21, 2022
Available Online: October 16, 2023

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Abstract

Abstract

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 r_c gradually decrease. The moisture condition of samples has almost no effects on r_c, which confirms that r_c is a parameter reflecting the structural quality.

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