Model tests on penetration and pullout of suction caissons in silt
Model tests on penetration and pullout of suction caissons in silt
复制标题
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Chen Ren-peng
中科院分区：
文献类型：
--
作者：
Chen Ren-peng
吸力贯入和极限抗拔能力是海洋平台/风力机深水或多沉箱基础吸力锚设计和施工中的两个关键问题。浙江大学在一个大型土槽中进行了吸力沉箱的大型模型试验，研究了吸力贯入和拔出过程中沉箱基础的受力特性。吸力贯入试验结果表明，吸力沉箱盖下的吸力对沉箱在粉土中的安装阻力影响不大。同时进行了不同加载速率下的沉箱抗拔试验，结果表明，当超过某一临界加载速率时，加载速率对沉箱地基性能的影响不大。根据试验结果，给出了不同加载条件下沉箱的极限抗拔能力。
Suction penetration and ultimate uplift capacity are the two key issues in the design and construction of suction caissons used as suction anchors in deep water or multi-caisson foundations for the offshore platforms/wind turbines.A programme of large-scale model tests on a suction caisson is carried out in a large soil tank in Zhejiang University to study the behaviors of the caisson foundations during suction penetration and pullout.The test results of suction penetration show that the suction under the lid just has a slight influence on installation resistance of the caissons in silt,and the suction required to penetrate the caisson without soil piping is well predicted based on the results of CPT tests.The pullout tests with different loading rates are also carried out,and the results indicate that loading rate has little effect on the performance of the caisson foundation if a critical loading rate is surpassed.Based on the test results,the ultimate pullout capacities of the caissons in silt for different loading conditions are presented.