Abstract:In this paper, the variation trend of underground water level and ground subsidence after dewatering were analysed combined with engineering case. The analytic target of this paper was a comprehensive foundation pit with local deep pits. By means of numerical simulation, the dewatering scheme model of the foundation pit was established. The analysis results showed that by setting waterproof curtain around the local deep pit， the number of dewatering wells in the deep pit can be reduced by one time, the ground settlement can be reduced by about 53%, and the road settlement around the pit can be reduced by about 23%. Meanwhile, the dewatering requirements can be met after the waterproof curtain enters 10 m below the pit bottom. However, when the depth was greater than 10 m, the influence of the water stop curtain on the bearing water level at the bottom and edge of the pit decreased gradually. Therefore, the recommended dewatering Scheme for this foundation pit was to set the waterproof curtain around the local deep pit, and the curtain entered 10 m below the pit bottom. The calculation and analysis process in this paper can provide reference for similar projects in the future.
