中粗砂中吸力锚的负压沉贯模型试验研究

李大勇; 张雨坤; 高玉峰; 宋言江

中粗砂中吸力锚的负压沉贯模型试验研究 English Version

1. 山东省土木工程防灾减灾重点实验室，山东青岛 266590;
2. 山东科技大学土木建筑学院，山东青岛 266590；

基金项目: 国家自然科学基金项目（51078227）；山东省自然科学基金项目（ZR2009FM003）；山东省“泰山学者”建设工程专项基金项目；教育部留学回国人员科研启动基金项目

详细信息

作者简介:
李大勇(1971- )，男，山东泰安人，博士，教授，博士生导师，从事海洋岩土工程方面研究。E-mail: ldy@sdust.edu.cn。

中图分类号: TU441，P751
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- 文章访问数: 1021
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出版历程
- 收稿日期: 2012-01-13
- 发布日期: 2012-12-24

Model tests on penetration of suction anchors in medium-coarse sand

1. Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Qingdao 266590, China;
2. College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China;
3. Geotechnical Research Institute, Hohai University, Nanjing 210098, China

摘要

摘要: 吸力锚是海洋工程中广泛采用的一种基础形式。其沉贯能力（即达到预定海床位置）是其承载力达到设计要求的重要保证。国内外针对吸力锚在细砂、粉土和黏土中的沉贯性进行了较多理论及模型试验研究，但对中粗砂研究相对较少。分别针对不同水位深度和不同抽吸速度条件，对吸力锚在中粗砂中的沉贯性进行了大量模型试验研究和分析，得到了负压与沉贯深度的关系。通过沉贯方案对比，得出了吸力锚负压沉贯的最佳试验条件。通过有机玻璃吸力锚对比沉贯试验，直观展示了沉贯过程中吸力锚中水塞和土塞的形成过程。吸力沉贯与压力贯入对比试验表明，负压导致的渗流显著降低了吸力锚的沉贯阻力，是中粗砂中得以沉贯的主要原因。基于试验成果，提出了模型试验条件下，吸力锚沉贯计算的理论公式。
- 吸力锚 /
- 沉贯 /
- 中粗砂 /
- 渗流 /
- 水塞 /
- 模型试验
Abstract: Suction anchors are widely used in offshore engineering for fixing platforms, offshore wind turbines and mooring floating facilities. Penetration of suction anchors, i.e., driven into a desired position in the seabed by the suction, is a key factor for the design. It is necessary for the bearing capacity to meet the needs. Researchers have focused their attention on the installation in the fine sand in a medium or dense state, silt and clay. This study shows that it is feasible for the penetration of suction anchors in the natural medium-coarse sand. Model tests are carried out to investigate the behavior of the penetration of steel suction anchors in medium-coarse sand by varying water levels and pumping speeds. The relation between the suction and the penetration depth is obtained. By comparing different installation approaches, the optimized method to achieve the maximum penetration depth is put forward. The formation of water/soil plug is observed by using Perspex suction anchors, and reasons for preventing the penetration of suction anchors are analyzed. Compared with the jacking tests, the seepage induced by vacuum plays a vital role in assisting the suction anchors to achieve the penetration in the medium-coarse sand. Finally, an approach is developed to calculate the required suction under a desired penetration depth on the basis of the model tests.
- suction anchor /
- penetration /
- medium-coarse sand /
- seepage /
- water plug /
- model test

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参考文献(17)

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文章访问数: 1021
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PDF下载量: 625
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中粗砂中吸力锚的负压沉贯模型试验研究 English Version

作者简介: 李大勇(1971- )，男，山东泰安人，博士，教授，博士生导师，从事海洋岩土工程方面研究。E-mail: ldy@sdust.edu.cn。

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出版历程

Model tests on penetration of suction anchors in medium-coarse sand

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出版历程

目录

作者简介:
李大勇(1971- )，男，山东泰安人，博士，教授，博士生导师，从事海洋岩土工程方面研究。E-mail: ldy@sdust.edu.cn。