In view of the sudden sinking behavior of some municipal engineering open caissons under the geological conditions of muddy soft soil,this paper takes a river-crossing open caisson project in the soft soil area of Jiaozhou coastal alluvial plain in Qingdao as an example.By checking the sinking stability coefficient of the open caisson in the soft soil foundation and comprehensively analyzing the mechanism of the sudden sinking behavior of the open caisson,a method of using cement-soil mixing pile to reinforce the muddy soil at the edge foot of the open caisson to improve the bearing capacity of the soil foundation under the edge foot is proposed to reduce the sinking stability coefficient of the open caisson and avoid the sudden sinking behavior during the sinking of the open caisson,which provides a reference for the design and application of the open caisson structure under similar geological conditions in this area.
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