Effect of Low Temperature on the Undrained Shear Strength of Deep-Sea Clay by Mini-Ball Penetration Tests
Effect of Low Temperature on the Undrained Shear Strength of Deep-Sea Clay by Mini-Ball Penetration Tests
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DOI：
10.3390/jmse10101424
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发表时间：
2022-10
影响因子：
2.9
通讯作者：
Zhongde Gu;Xingsen Guo;Hou-bin Jiao;Y. Jia;T. Nian
中科院分区：
文献类型：
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作者：
Zhongde Gu;Xingsen Guo;Hou-bin Jiao;Y. Jia;T. Nian
深海粘土不排水抗剪强度的现场测试技术还很不发达。室内测试仍然是必要的，现场测试和实验室测试之间存在很大的温差。为了分析温度对不排水剪切强度的影响，本研究测定了南中国海相粘土样品的物理性质，并在低温(4℃)和室温(20℃)下用微球法进行了贯入试验。结果表明，当温度从20℃降至4℃时，粘土强度提高了14.1~30.0%，粘土样品中结合水的强度和自由水的粘度随温度的降低而增加，这是粘土强度提高的根本原因。在此基础上，对室内试验测得的不排水剪切强度值进行了修正，为海洋工程提供了更合理的参数。
The technology for in situ testing of the undrained shear strength of deep-sea clay is underdeveloped. Indoor tests remain necessary, and there is a large temperature difference between in situ and laboratory tests. To analyse the effect of temperature on undrained shear strength, in this study the physical characteristics of marine clay samples from the South China Sea were determined, followed by penetration tests by the mini-ball method under low (4 °C) and room (20 °C) temperatures. The results indicated that the clay strength increased by 14.1–30.0% as the temperature decreased from 20 °C to 4 °C, and the strength of the bound water and the viscosity of the free water in the clay sample increased as the temperature decreased, which was the root cause of the increase in the clay strength. Based on the research, it is possible to correct the undrained shear strength values measured in laboratory tests and provide more reasonable parameters for ocean engineering.