厦门市北溪引水主干渠改造工程基坑及围护设计

Design of Foundation Pit and Enclosure for Xiamen North Creek Diversion Trunk Channel Reconstruction Project

以北溪引水主干渠改造工程为背景,基于不同工程段提出不同基坑支护方案进行比选,得到基坑分段设计方案:具备放坡开挖界面时采用放坡开挖方式进行施工;不具备开挖界面时采用板式支护体系+内支撑的方式进行施工;过河段采用钻孔灌注桩+三轴搅拌桩止水进行基坑支护,同时兼有未来保护倒虹吸功能。

Taking the Xiamen North Creek Diversion Trunk Channel Reconstruction Project as the background, the different support schemes of foundation pit according to the different engineering sections are compared and selected. The obtained design scheme of foundation pit by sections is to use the sloping excavation method in the sloping excavation interface, to use the plate-type support system + inner support mode in the non-sloping excavation interface for construction, and to use the cast-in-site pile +triaxial mixing pile water stop for the supporting of foundation pit in the crossing-river section. At the same time, there is the function of future protection of inverted siphon.