Stability Analysis Of Foundation Pit By Cfg Pile Construction In Partly Excavated Foundation Under The Action Of Seepage

The construction of a large number of basement of high-rise buildings must be carried out during the excavation of deep foundation pit. Most of the current city around the deep foundation pit of building more and more intensive, structure more and more complicated, so the influence of foundation excavation on surrounding buildings deformation increases day by day.Therefore, the application of deep foundation pit and supporting technology in civil engineering construction in more wide.In the foundation pit engineering of Hebei Province, the construction personnel according to the requirements of the design of deep foundation pit excavation in has been part of the long spiral construction technology of CFG pile construction.In view of the above problems this topic using FLAC3D finite difference software engineering practice for the three-dimensional seepage stability analysis.Through software simulation, considering the seepage in the excavation of foundation pit construction part influence on the stability of foundation pit CFG pile. And the simulation results and the actual monitoring results were compared and analyzed. Summarize the reasons what caused during the construction of foundation pit surrounding buildings cracking.Research shows that:the excavation of foundation pit in the part of construction of CFG pile, due to the rapid sampling effect in foundation pit will make the earth pressure in passive zone of pit seepage loss, characteristic of the pit bottom soil destroyed, increased flow velocity, resulting in the soil around the foundation pit deformation, crack damage of buildings.According to the research results, this paper puts forward the construction process of CFG pile is reasonable to similar projects, and improved the scheme of foundation pit supporting and waterproof curtain scheme, the results can provide a reference for future similar project, it has guidance significance for the construction of similar engineering.