Large-scale experimental investigation of the installation of suction caissons in silt sand |
| |
| Institution: | 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, No. 92, Weijin Road, Tianjin 300072, China;2. General Institute of Water Resources and Hydropower Planning and Design, No. 2-1, Liupukang Beixiaojie Road, Beijing 100120, China;1. Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, PR China;2. College of Civil Engineering & Architecture, Shandong University of Science and Technology, Qingdao 266590, PR China;3. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, 210098, PR China;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. School of Civil Engineering, Tianjin University, Tianjin, 300072, China;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;2. Key Laboratory of Coast Civil Structure Safety (Tianjin University), Ministry of Education, Tianjin 300072, China;3. School of Civil Engineering, Tianjin University, Tianjin 300072, China |
| |
| Abstract: | Offshore wind power is a rapidly growing area of electricity in China. In the present paper, interaction mechanisms between the caisson for wind turbines and saturated silt sand are investigated with laboratory tests based on two different installation methods, jacking installation and suction installation. For the jacking installation process, the results indicate that the soil pressures inner and outer the skirt of the caisson vary with a similar feature and the magnitudes of the two are nearly balanced. The tip resistance plays a key role in the total jacking installation resistance. This paper examines the predictive performance of qc method and API approach for jacking installation resistance. It is demonstrated that the qc method provides better predictions. The resistance coefficients are recommended. For the case of suction installation, however, the changes of soil pressures inner and outer the skirt are contrasting. Specifically, the inner pressure and tip resistance fall dramatically, but the outer pressure increases when suction is applied. Seepage effect is found to be an important mechanism for the installation of suction caisson. The reduction ratios of the inner friction and tip resistance follow a power-function with the normalized suction. Based on the test results, a prediction method for the required suction has been developed and evaluated. |
| |
| Keywords: | Soil pressure Tip resistance Installation resistance Seepage effect Required suction Resistance reduction |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
