Research on the application of dual-purpose diaphragm walls for ultra-deep foundation pits in high confined water area
An ultra-deep foundation pit in Quanzhou has an excavation depth of around 20 m,and it is surrounded by lots of buildings and underground pipelines.Due to the existence of complex multi-layer confined aquifers,lateral leakage and upheaval is likely to occur if without proper groundwater treatment.However,pumping and lowering of the confined water is not suggestive due to its negative impact on the surrounding environment.Therefore,dual-purpose diaphragm walls was adopted as the retaining structures in this project,mainly be-cause of its high stiffness and good water barrier effect,which is also designed as the outside walls of the basement.The monitoring results indicate that the deformation of the retaining structure and the environmental impact are both small,verifying the safety and the rationality of this design.At last,the reasons of leakage and bulge and exposed reinforcement of diaphragm wall were analyzed in this paper and the corre-sponding measures were also provided,which gave a good reference for other similar projects.
Ultra-deep foundation pitHigh confined waterDual-purpose diaphragm wall
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