H-M bearing capacity of a modified suction caisson determined by using load-/displacement-controlled methods
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- 作者：Yu-kun Zhang 张雨坤 ; Yu-feng Gao 高玉峰 ; Da-yong Li 李大勇…
- 关键词：MSC (modified suction caisson) ; saturated marine fine sand ; model tests ; load ; and displacementcontrolled loading ; laterally combined bearing capacity ; earth pressure
- 刊名：China Ocean Engineering
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：30
- 期：6
- 页码：926-941
- 全文大小：
- 刊物类别：Engineering
- 刊物主题：Offshore Engineering; Oceanography; Coastal Sciences; Fluid- and Aerodynamics; Marine & Freshwater Sciences; Numerical and Computational Physics, Simulation;
- 出版者：Chinese Ocean Engineering Society
- ISSN：2191-8945
- 卷排序：30
文摘
This paper presents a series of monotonically combined lateral loading tests to investigate the bearing capacity of the MSCs (modified suction caissons) in the saturated marine fine sand. The lateral loads were applied under load- and displacement-controlled methods at the loading eccentricity ratios of 1.5, 2.0 and 2.5. Results show that, in the displacement-controlled test, the deflection-softening behavior of load-deflection curves for MSCs was observed, and the softening degree of the load-deflection response increased with the increasing external skirt length or the decreasing loading eccentricity. It was also found that the rotation center of the MSC at failure determined by the load-controlled method is slightly lower than that by the displacement-controlled method. The calculated MSC capacity based on the rotation center position in serviceability limit state is relatively conservative, compared with the calculated capacity based on the rotation center position in the ultimate limit state. In the limit state, the passive earth pressures opposite the loading direction under load- and displacement-controlled methods decrease by 46% and 74% corresponding to peak values, respectively; however, the passive earth pressures in the loading direction at failure only decrease by approximately 3% and 7%, compared with their peak values.