黏土中深水吸力锚负压安装试验研究

Testing Study of Deep Water Suction Anchors' Suction-assisted Installation in Clay

根据渗流对黏性土塞的破坏理论,对吸力锚负压安装过程进行室内模型试验研究。介绍了吸力锚小尺度模型试验所采用的试验平台和试验过程,研究对比了负压及静载安装的阻力,并在负压安装中发现了锚内部土塞现象以及土体裂纹扩展现象。为了达到更加精确的试验结果,自行设计并搭建了新型吸力锚安装试验装置,提出了应用外部加压的方法模拟深水复杂环境,为试验结果的精确性提供了保证。试验结果表明:负压安装虽减小了安装阻力,但同时导致了锚内黏性土塞隆起开裂,并存在"活塞"破坏和裂纹扩展破坏2种机制。

According to the theoretical analysis of damage that seepage has done to the cohesive soil plug,this paper will focus on the indoor model testing research of suction anchor’s installa-tion process,and the comparison of negative pressure and static load installation with their instal-ling resistance,giving a thorough introduction to the test plat and form and test process of small scale model.For the purpose of achieving even more accurate results,a new type of suction anchor installation test device are designed and built up,combining with the research of scholars at home and abroad.The experimental results show that:although the suction pressure mounted to reduce installation resistance,it leads to the cracking of cohesive soil within the anchor at the same time, also to two extremes of soil plug damage and crack propagation damage.