依托京滨城际滨海西站市政配套工程,采用FLAC3D软件建立三维实体模型,分析A区主体盾构井段深基坑开挖过程中地下连续墙后土体侧向位移和支撑上的轴力.结果表明:不同的施工阶段,土体位移和5道支撑的变化相差较大;第1道支撑从开始开挖到另4道支撑全部拆除,轴力变化为压-拉-压;基坑开挖施工完成后,各支撑上的轴力趋于稳定,墙后土体向基坑内侧移动,最大可达11.0mm;底板混凝土浇筑完成后,土体侧向最大位移出现在基坑深度5.0 m的位置,为6.3 mm.
On Support Internal Force and Deformation for Deep Foundation Pit under Complex Conditions
Relying on the municipal supporting project of Jinhbin Intercity at Binhai West Station,by use of FLAC3D numerical simulation software,a three-dimensional solid model was established.The lateral displacement of the soil behind the diaphragm wall and the axial force on the support during the deep foundation pit excavation of the main shield shaft section in area A were studied.The results show that in different construction stages,the soil displacement and the change of five pieces of supports were quite different greatly.From the beginning of excavation of the removal of the other four pieces of supports,the axial force changes from compression to tension and then to compression.After the foundation pit excavation is completed,the axial force on each support tends to be stable,the soil mass behind the wall moves towards the inner side of foundation pit by 11.0 mm maximally.When the concrete of baseboard plates is poured,the maximum lateral displacement of soil mass is 6.3 mm when the depth of the foundation pit is 5.0 m.
foundation pit engineeringnumerical simulationdiaphragm wallforce analysisydeformation studystability