Abstract. The working mechanism of the caisson cofferdam depends on the self-weight of the structure and internal filling to ensure its skid resistance and overturn resistance stability. Using the strength reduction method, the safety factor of the caisson cofferdam can be obtained. The potential slide surface can be searched automatically without constraining the range of the arc center. According to the results, the slippage surface goes through the bottom of the caisson. Based on the judgement criterion of the strength reduction method, the final safety factor is about 1.65. IntroductionIn the coastal area, especially in the flouring area, the land shortage is more and more obvious. After several decades of construction along the coastline, there is nearly no ascendant land for the land resource. There are plenty of successful cases of artificial island and many research documents have been kept. In the Kawasaki artificial island, the cofferdam structure of the island adopts the continuous concrete wall with 2.8m thickness and 119m length, which is the greatest continuous concrete wall in the world. The sand compaction pile and the deep cement mixing methods are used to reinforce the soft ground. During the construction, massive and advanced equipment and technology of measurement and location are developed.The gravity caisson is a retaining wall structure that utilizes its internal filling and upper structure to maintain its stability against the possible sliding and overturn. The advantages of gravity caisson include its long service durability, great bearing capacity for the wharf load, antisepticise, low cost etc. However, due to its large self-weight and upper load, the appearance of the uneven settlement and the inclination of wall body, the requirement of the foundation is relatively strict compared with other wharf structure, which is suitable for the solid seabed. The structural style on the gravity wharf depends on the structure of wall body and its construction method. It can be classified into block structure, caisson structure, buttress structure and large cylinder structure.Considering that the initial starting of artificial island is relatively late in China and there are still many obstructions in the future, the numerical simulation about the deformation and stability of the cofferdam wall of the island is very necessary for the future design and construction. In this paper, the stability of caisson cofferdam is analyzed numerically to accumulate experience.
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