沉井在淤泥质软土地基下的应用研究

STUDY ON THE APPLICATION OF OPEN CAISSON IN MUDDY SOFT SOIL FOUNDATION

以青岛胶州海岸冲积平原软土地区某过河沉井工程为例,通过验算沉井在软土地基的下沉稳定系数,综合分析沉井突沉行为机理,提出了采用水泥土搅拌桩加固沉井刃脚处淤泥质土从而提高刃脚下土地基承载力的方法以减小沉井下沉稳定系数,避免沉井下沉时出现突沉行为,为该地区类似地质条件下的沉井结构设计应用研究提供借鉴。

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.