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在单向循环负荷下,海洋粘土的不排水行为,具有可变的限制压力
1School of Resources and Civil Engineering, Suzhou University, Suzhou, 234000, People's Republic of China. leisun2015@163.com.
Scientific reports
|June 12, 2024
概括
可变封闭压力 (VCP) 循环三轴测试揭示了软的海洋粘土.
科学领域:
- 地质技术工程 地质技术工程
- 土壤力学 土壤力学
- 交通基础设施 交通基础设施
背景情况:
- 交通负载导致沉积在软海洋粘土中,影响运输基础设施安全.
- 以前的研究主要使用恒定限制压力 (CCP) 循环三轴测试.
- 变量限制压力 (VCP) 测试提供了更现实的交通负载应力路径模拟.
研究的目的:
- 研究在循环负荷下软海洋粘土的不排水行为.
- 比较VCP和CCP测试对土壤反应的影响.
- 分析过度巩固比率 (OCR) 和应力路径对孔水压力和应变的影响.
主要方法:
- 在温州软粘土上进行了循环三轴测试,使用VCP对平时巩固 (NC) 和过度巩固 (OC) 进行了测试.
- 变化的循环应力比率 (CSR) 和总应力路径 (η).
- 量化永久轴应变 (εpa) 的发展.
主要成果:
- 孔水压演变在NC和OC标本之间存在显著差异.
- 在相同的CSR和 η下,OC标本对孔水压的影响最小.
- 有效应力路径斜率与总应力路径相关,不论OCR或VCP应用.
- 永久轴应变显著取决于n和OCR.
- 无论是VCP还是OCR都限制了应变积累.
结论:
- VCP测试提供了更准确的交通负载条件的表示.
- 开发了一个功率定律函数,以基于 η 和 OCR 预测永久变形.
- 这些发现增强了对在交通负载下软海洋粘土行为的理解,用于基础设施设计.
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