Research on Optimization and Application of Deep Foundation Pit Support in Handan Water-rich Strata
Handan City,Hebei Province is located in the North China Plain.The groundwater resources in this area are abundant.In urban construction,the design of foundation pit support should not only ensure the safety of the project,but also take into account the economy.Based on the deep foundation pit engineering of underground comprehensive pipe gallery in Zhaowang Street of Handan City,Midas-GTS software is used to simulate the whole process of foundation pit dewatering and excavation.After verifying the accuracy of the model,the influence of the insertion ratio of supporting pile,the prestress of internal support and the waterproof curtain on the deformation of foundation pit is analyzed respectively.The results show that the decrease of the embedded depth of the supporting pile will lead to the increase of the difference between the soil pressure before and after the pile,resulting in the instability and failure of the foundation pit.When the prestress value of the inner support is 200 kN,the deformation of the foundation pit can be effectively limited.The addition of waterproof curtain can prolong the seepage path,slow down the seepage velocity,and play a positive role in inhibiting the deformation of foundation pit.The relevant results can provide experience and reference for the optimization of similar water-rich strata support.
foundation pit excavationnumerical simulationfoundation pit deformationwater-rich strat
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