Experimental Study on Strength Characteristics of Overconsolidated Gassy Clay
Gassy clay, commonly encountered in coastal areas as overconsolidated deposits, demonstrates distinct mechanical properties posing risks for submarine geohazards and engineering stability. Consolidated undrained triaxial tests combined with cyclic simple shear tests were performed on specimens with...
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| Language: | English |
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MDPI AG
2025-04-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/13/5/904 |
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| author | Tao Liu Longfei Zhu Yan Zhang Chengrong Qing Yuanzhe Zhan Chaonan Zhu Jiayang Jia |
| author_facet | Tao Liu Longfei Zhu Yan Zhang Chengrong Qing Yuanzhe Zhan Chaonan Zhu Jiayang Jia |
| author_sort | Tao Liu |
| collection | DOAJ |
| description | Gassy clay, commonly encountered in coastal areas as overconsolidated deposits, demonstrates distinct mechanical properties posing risks for submarine geohazards and engineering stability. Consolidated undrained triaxial tests combined with cyclic simple shear tests were performed on specimens with varying overconsolidation ratios (OCRs) and initial pore pressures, supplemented by SEM microstructural analysis. Triaxial results indicate that OCR controls the transitions between shear contraction and dilatancy, which govern both stress–strain responses and excess pore pressure development. Higher OCR with lower initial pore pressure increases stress path slope, raises undrained shear strength (<i>s</i><sub>u</sub>), reduces pore pressure generation, and induces negative pore pressure at elevated OCR. These effects originate from compressed gas bubbles and limited bubble flooding under overconsolidation, intensifying dilatancy during shear. Cyclic tests reveal gassy clay’s superior cyclic strength, slower pore pressure accumulation, reduced stiffness softening, and enhanced deformation resistance relative to saturated soils. Cyclic pore pressure amplitude increases with OCR, while peak cyclic strength and anti-softening capacity occur at OCR = 2, implying gas bubble interactions. |
| format | Article |
| id | doaj-art-a6518cc3fc674a159cfb88aceb5c24df |
| institution | OA Journals |
| issn | 2077-1312 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj-art-a6518cc3fc674a159cfb88aceb5c24df2025-08-20T01:56:28ZengMDPI AGJournal of Marine Science and Engineering2077-13122025-04-0113590410.3390/jmse13050904Experimental Study on Strength Characteristics of Overconsolidated Gassy ClayTao Liu0Longfei Zhu1Yan Zhang2Chengrong Qing3Yuanzhe Zhan4Chaonan Zhu5Jiayang Jia6Shandong Engineering Research Center of Marine Exploration and Conservation, Ocean University of China, Qingdao 266100, ChinaShandong Engineering Research Center of Marine Exploration and Conservation, Ocean University of China, Qingdao 266100, ChinaKey Laboratory of Intelligent Underground Detection Technology, Anhui Jianzhu University, Hefei 230000, ChinaShandong Engineering Research Center of Marine Exploration and Conservation, Ocean University of China, Qingdao 266100, ChinaShandong Engineering Research Center of Marine Exploration and Conservation, Ocean University of China, Qingdao 266100, ChinaShandong Engineering Research Center of Marine Exploration and Conservation, Ocean University of China, Qingdao 266100, ChinaShandong Engineering Research Center of Marine Exploration and Conservation, Ocean University of China, Qingdao 266100, ChinaGassy clay, commonly encountered in coastal areas as overconsolidated deposits, demonstrates distinct mechanical properties posing risks for submarine geohazards and engineering stability. Consolidated undrained triaxial tests combined with cyclic simple shear tests were performed on specimens with varying overconsolidation ratios (OCRs) and initial pore pressures, supplemented by SEM microstructural analysis. Triaxial results indicate that OCR controls the transitions between shear contraction and dilatancy, which govern both stress–strain responses and excess pore pressure development. Higher OCR with lower initial pore pressure increases stress path slope, raises undrained shear strength (<i>s</i><sub>u</sub>), reduces pore pressure generation, and induces negative pore pressure at elevated OCR. These effects originate from compressed gas bubbles and limited bubble flooding under overconsolidation, intensifying dilatancy during shear. Cyclic tests reveal gassy clay’s superior cyclic strength, slower pore pressure accumulation, reduced stiffness softening, and enhanced deformation resistance relative to saturated soils. Cyclic pore pressure amplitude increases with OCR, while peak cyclic strength and anti-softening capacity occur at OCR = 2, implying gas bubble interactions.https://www.mdpi.com/2077-1312/13/5/904overconsolidated gassy clayconsolidation testtriaxial testcyclic simple shear testnumerical simulation |
| spellingShingle | Tao Liu Longfei Zhu Yan Zhang Chengrong Qing Yuanzhe Zhan Chaonan Zhu Jiayang Jia Experimental Study on Strength Characteristics of Overconsolidated Gassy Clay Journal of Marine Science and Engineering overconsolidated gassy clay consolidation test triaxial test cyclic simple shear test numerical simulation |
| title | Experimental Study on Strength Characteristics of Overconsolidated Gassy Clay |
| title_full | Experimental Study on Strength Characteristics of Overconsolidated Gassy Clay |
| title_fullStr | Experimental Study on Strength Characteristics of Overconsolidated Gassy Clay |
| title_full_unstemmed | Experimental Study on Strength Characteristics of Overconsolidated Gassy Clay |
| title_short | Experimental Study on Strength Characteristics of Overconsolidated Gassy Clay |
| title_sort | experimental study on strength characteristics of overconsolidated gassy clay |
| topic | overconsolidated gassy clay consolidation test triaxial test cyclic simple shear test numerical simulation |
| url | https://www.mdpi.com/2077-1312/13/5/904 |
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