Research on Water-stopping Measures and Excavation Deformation of Deep Foundation Pit in a Power Transmission Project
[Purposes]In order to reduce the construction risk caused by groundwater and soft soil in a power transmission project and ensure the safe construction of deep foundation pits,the well-pipe de-scending and high-pressure rotary piling water-stopping schemes are designed by analyzing its engineer-ing geological and hydrogeological conditions.[Methods]The pit profile grid model is constructed,and deformations caused by excavation of the deep foundation pit are simulated using finite-difference method.[Findings]Calculation results show that after the first step of sloping excavation,the maximum horizontal displacement is 26.7 mm,and the maximum pit bottom bulge is 10 mm;after the second step of excavation,the maximum horizontal displacement of the pit is 24.6 mm,the maximum horizontal dis-placement of the ground wall is about 15 mm,the maximum surface settlement is 6.5 mm,and the defor-mations of the excavation are within the safety range.[Conclusions]The simulation results show that un-der the engineering geological and hydrogeological conditions,the designed precipitation and water stop-ping as well as excavation schemes are safe and reasonable,and have certain reference significance for deep foundation pit projects under similar conditions.
deep foundation pit excavationsoil nail wallwater-stopping curtainfinite difference methodfoundation pit deformation
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