Abstract: A model of full coupling between seepage and stress of unsaturated soil was established to research the coupling of seepage field and stress field during the deep excavation of foundation pit. The lateral deformation of soil-retaining structure and the settlement of ground surrounding the foundation pit in different excavation stages were predicted by using this model. The theoretical values were compared with the actual monitored values, which revealed that the seepage-stress coupling model is more rational and more effective in the case of deep excavation with dewatering process.

Key words: deep foundation pit, stress field, seepage field, coupling, deformation monitoring