Experimental Study on the Impact of Water Content on the Strength Parameters of Coral Gravelly Sand
The effect of capillary water caused by heavy rainfall and groundwater level fluctuations can induce the erosion and collapse of island reef coral sand foundations. Here, the effects of water content (<i>ω</i>) on the shear strength parameters of coral gravelly sand are analyzed at the m...
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MDPI AG
2020-08-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/8/9/634 |
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| author | Yang Wu Xing Wang Jian-Hua Shen Jie Cui Chang-Qi Zhu Xin-Zhi Wang |
| author_facet | Yang Wu Xing Wang Jian-Hua Shen Jie Cui Chang-Qi Zhu Xin-Zhi Wang |
| author_sort | Yang Wu |
| collection | DOAJ |
| description | The effect of capillary water caused by heavy rainfall and groundwater level fluctuations can induce the erosion and collapse of island reef coral sand foundations. Here, the effects of water content (<i>ω</i>) on the shear strength parameters of coral gravelly sand are analyzed at the macro and micro scales by laboratory consolidated-drained triaxial compression and nuclear magnetic resonance tests. Furthermore, particle breakage characteristics of coral gravelly sand under the static load are discussed. With increasing <i>ω</i>, (1) the internal friction angle increases slightly (<1°) then decreases; (2) the apparent cohesion is more sensitive to the change in the <i>ω</i>; (3) with an increase from 5.4% to 21.3%, the bound water content remains almost unchanged; (4) the capillary water content is the main factor impacting the apparent cohesion; (5) the increase in free water content is the internal cause of the decreasing internal friction angle of coral gravelly sand with <i>ω</i> > 11.1%; and (6) the particle breakage increases, and there is an approximately linear relationship between the median particle diameter (<i>d<sub>50</sub></i>) and relative breakage index (<i>Br</i>). The established physical model can reflect the influence of water content and plastic work and describe the evolution law of particle breakage. |
| first_indexed | 2024-03-10T17:06:36Z |
| format | Article |
| id | doaj.art-21367e845e644bb4833d1ea9fb4dcd98 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-10T17:06:36Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
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| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-21367e845e644bb4833d1ea9fb4dcd982023-11-20T10:46:44ZengMDPI AGJournal of Marine Science and Engineering2077-13122020-08-018963410.3390/jmse8090634Experimental Study on the Impact of Water Content on the Strength Parameters of Coral Gravelly SandYang Wu0Xing Wang1Jian-Hua Shen2Jie Cui3Chang-Qi Zhu4Xin-Zhi Wang5School of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaState Key Laboratory of Geotechnical Mechanics and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaState Key Laboratory of Geotechnical Mechanics and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaState Key Laboratory of Geotechnical Mechanics and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaThe effect of capillary water caused by heavy rainfall and groundwater level fluctuations can induce the erosion and collapse of island reef coral sand foundations. Here, the effects of water content (<i>ω</i>) on the shear strength parameters of coral gravelly sand are analyzed at the macro and micro scales by laboratory consolidated-drained triaxial compression and nuclear magnetic resonance tests. Furthermore, particle breakage characteristics of coral gravelly sand under the static load are discussed. With increasing <i>ω</i>, (1) the internal friction angle increases slightly (<1°) then decreases; (2) the apparent cohesion is more sensitive to the change in the <i>ω</i>; (3) with an increase from 5.4% to 21.3%, the bound water content remains almost unchanged; (4) the capillary water content is the main factor impacting the apparent cohesion; (5) the increase in free water content is the internal cause of the decreasing internal friction angle of coral gravelly sand with <i>ω</i> > 11.1%; and (6) the particle breakage increases, and there is an approximately linear relationship between the median particle diameter (<i>d<sub>50</sub></i>) and relative breakage index (<i>Br</i>). The established physical model can reflect the influence of water content and plastic work and describe the evolution law of particle breakage.https://www.mdpi.com/2077-1312/8/9/634coral gravelly sandwater contentstrength parametersmicrostructureparticle breakageplastic work |
| spellingShingle | Yang Wu Xing Wang Jian-Hua Shen Jie Cui Chang-Qi Zhu Xin-Zhi Wang Experimental Study on the Impact of Water Content on the Strength Parameters of Coral Gravelly Sand Journal of Marine Science and Engineering coral gravelly sand water content strength parameters microstructure particle breakage plastic work |
| title | Experimental Study on the Impact of Water Content on the Strength Parameters of Coral Gravelly Sand |
| title_full | Experimental Study on the Impact of Water Content on the Strength Parameters of Coral Gravelly Sand |
| title_fullStr | Experimental Study on the Impact of Water Content on the Strength Parameters of Coral Gravelly Sand |
| title_full_unstemmed | Experimental Study on the Impact of Water Content on the Strength Parameters of Coral Gravelly Sand |
| title_short | Experimental Study on the Impact of Water Content on the Strength Parameters of Coral Gravelly Sand |
| title_sort | experimental study on the impact of water content on the strength parameters of coral gravelly sand |
| topic | coral gravelly sand water content strength parameters microstructure particle breakage plastic work |
| url | https://www.mdpi.com/2077-1312/8/9/634 |
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