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A platform for research: civil engineering, architecture and urbanism
Earth pressures on modified suction caisson in saturated sand under monotonic lateral loading
A modified suction caisson (MSC) can be used to support the offshore wind turbine. This paper presents an experimental study and a numerical simulation on the earth pressure distribution along the MSC embedded in saturated marine fine sand. Results show that the yield envelops for the MSC and the corresponding regular suction caisson in the H-M space can be represented by a linear relationship. It was also found that the Prasad and Chari method, which is popular in analyzing the earth pressure distribution along lateral loaded rigid plies, can well predict the maximum net earth pressure on the regular suction caisson. However, for the MSC, since the external skirt can resist a considerable portion of the lateral load, Prasad and Chari method overestimates the maximum net earth pressures acting on the internal compartmental shaft of the MSC. Numerical simulation results indicate that in the ultimate limit state the maximum net earth pressure acting on the external skirt wall in the loading direction is larger than that on the internal compartment wall. However, the maximum net earth pressure along the caisson embedded depth is obtained at the MSC base opposite the loading direction. In addition, the separation between the top lids of the internal compartment and external skirt occurs opposite the loading direction. The lateral load and the resulting overturning moment acting on the MSC are mainly carried by the passive earth pressure zones along the inner and outer shafts of the internal compartment and the external skirt both in the loading and opposite the loading directions and under the external skirt lid in the loading direction. The main reason of the suction caisson failure is that the sand in the lower passive earth pressure zone opposite the loading direction yields completely.
Earth pressures on modified suction caisson in saturated sand under monotonic lateral loading
A modified suction caisson (MSC) can be used to support the offshore wind turbine. This paper presents an experimental study and a numerical simulation on the earth pressure distribution along the MSC embedded in saturated marine fine sand. Results show that the yield envelops for the MSC and the corresponding regular suction caisson in the H-M space can be represented by a linear relationship. It was also found that the Prasad and Chari method, which is popular in analyzing the earth pressure distribution along lateral loaded rigid plies, can well predict the maximum net earth pressure on the regular suction caisson. However, for the MSC, since the external skirt can resist a considerable portion of the lateral load, Prasad and Chari method overestimates the maximum net earth pressures acting on the internal compartmental shaft of the MSC. Numerical simulation results indicate that in the ultimate limit state the maximum net earth pressure acting on the external skirt wall in the loading direction is larger than that on the internal compartment wall. However, the maximum net earth pressure along the caisson embedded depth is obtained at the MSC base opposite the loading direction. In addition, the separation between the top lids of the internal compartment and external skirt occurs opposite the loading direction. The lateral load and the resulting overturning moment acting on the MSC are mainly carried by the passive earth pressure zones along the inner and outer shafts of the internal compartment and the external skirt both in the loading and opposite the loading directions and under the external skirt lid in the loading direction. The main reason of the suction caisson failure is that the sand in the lower passive earth pressure zone opposite the loading direction yields completely.
Earth pressures on modified suction caisson in saturated sand under monotonic lateral loading
Zhang, Yukun (author) / Li, Dayong (author) / Gao, Yufeng (author)
2016-09-01
16 pages
Article (Journal)
Electronic Resource
English
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