Abstract: Based on Biot’s consolidation theory, the effects of the performance of waterproof-wall in deep foundation-pit on surrounding environment are analyzed. The subject investigated deals with the effectiveness of the burying depth of waterproof-wall, the influence of water leakage in enclosed structures of waterproof-wall on ground water table and foundation displacement, etc. For purpose of convenience, the excavated soil is treated as the idealized air element in FEM programming. The results show that in the case of thick pervious subsoil, the increase of the burying depth of waterproof-wall can hardly decrease the effects of foundation-pit on surrounding environment. The dense contours of seepage potential around the location of leakage are found with high seepage velocity, liable to induce expanded destruction. The water leakage occurred in the perpendicularly enclosed waterproof-wall will lead to the outstanding increase of the magnitude of foundation settlement around pit margin and ground lateral-displacement, as well as the rapid drawdown, etc. The conclusions could be provided for the appraisal and solution strategies for the effects of water leakage on surrounding environment.

Key words: Biot’s consolidation theory, waterproof wall, deep foundation pit, finite element method, ground settlement